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The presence of glide symmetries in periodic structures can introduce beneficial modifications in their electromagnetic properties. The difference between glide and non-glide periodic structures is due to the distinctive coupling between their constituent sub-unit cells. In this paper, we describe the recent discoveries on the remarkable properties of glide-symmetric periodic structures, which include widened stopbands, reduced dispersion, as well as enhanced anisotropy and magnetic response. These properties are explained through canonical structures simulated with two methods: mode matching and multimode transfer-matrix analysis. We also review the recent use of these distinctive properties for solving technological problems in practical devices such as filters, gap waveguide components, low-leakage flanges, compressed lenses, low-reflected material transitions and leaky-wave antennas with applications in 5G terrestrial communication systems, millimetre-wave satellite systems and automated contactless measurement techniques., QC 20240711

The presence of glide symmetries in periodic structures can introduce beneficial modifications in their electromagnetic properties. The difference between glide and non-glide periodic structures is due to the distinctive coupling between their constituent sub-unit cells. In this paper, we describe the recent discov eries on the remarkable properties of glide-symmetric periodic structures, which include widened stopbands, reduced dispersion, as well as enhanced anisotropy and magnetic response. These properties are explained through canonical structures simulated with two methods: mode matching and multimode transfer-matrix analysis. We also review the recent use of these distinctive properties for solving technological problems in practical devices such as filters, gap waveguide components, low-leakage flanges, compressed lenses, low-reflected material transitions and leaky-wave antennas with applications in 5G terrestrial communication systems, millimetre-wave satellite systems and automated contactless measurement techniques

The presence of glide symmetries in periodic structures can introduce beneficial modifications in their electromagnetic properties. The difference between glide and non-glide periodic structures is due to the distinctive coupling between their constituent sub-unit cells. In this paper, we describe the recent discov eries on the remarkable properties of glide-symmetric periodic structures, which include widened stopbands, reduced dispersion, as well as enhanced anisotropy and magnetic response. These properties are explained through canonical structures simulated with two methods: mode matching and multimode transfer-matrix analysis. We also review the recent use of these distinctive properties for solving technological problems in practical devices such as filters, gap waveguide components, low-leakage flanges, compressed lenses, low-reflected material transitions and leaky-wave antennas with applications in 5G terrestrial communication systems, millimetre-wave satellite systems and automated contactless measurement techniques

The presence of glide symmetries in periodic structures can introduce beneficial modifications in their electromagnetic properties. The difference between glide and non-glide periodic structures is due to the distinctive coupling between their constituent sub-unit cells. In this paper, we describe the recent discov eries on the remarkable properties of glide-symmetric periodic structures, which include widened stopbands, reduced dispersion, as well as enhanced anisotropy and magnetic response. These properties are explained through canonical structures simulated with two methods: mode matching and multimode transfer-matrix analysis. We also review the recent use of these distinctive properties for solving technological problems in practical devices such as filters, gap waveguide components, low-leakage flanges, compressed lenses, low-reflected material transitions and leaky-wave antennas with applications in 5G terrestrial communication systems, millimetre-wave satellite systems and automated contactless measurement techniques

The presence of glide symmetries in periodic structures can introduce beneficial modifications in their electromagnetic properties. The difference between glide and non-glide periodic structures is due to the distinctive coupling between their constituent sub-unit cells. In this paper, we describe the recent discov eries on the remarkable properties of glide-symmetric periodic structures, which include widened stopbands, reduced dispersion, as well as enhanced anisotropy and magnetic response. These properties are explained through canonical structures simulated with two methods: mode matching and multimode transfer-matrix analysis. We also review the recent use of these distinctive properties for solving technological problems in practical devices such as filters, gap waveguide components, low-leakage flanges, compressed lenses, low-reflected material transitions and leaky-wave antennas with applications in 5G terrestrial communication systems, millimetre-wave satellite systems and automated contactless measurement techniques

The presence of glide symmetries in periodic structures can introduce beneficial modifications in their electromagnetic properties. The difference between glide and non-glide periodic structures is due to the distinctive coupling between their constituent sub-unit cells. In this paper, we describe the recent discov eries on the remarkable properties of glide-symmetric periodic structures, which include widened stopbands, reduced dispersion, as well as enhanced anisotropy and magnetic response. These properties are explained through canonical structures simulated with two methods: mode matching and multimode transfer-matrix analysis. We also review the recent use of these distinctive properties for solving technological problems in practical devices such as filters, gap waveguide components, low-leakage flanges, compressed lenses, low-reflected material transitions and leaky-wave antennas with applications in 5G terrestrial communication systems, millimetre-wave satellite systems and automated contactless measurement techniques

In this article, tailored temperature zones are used to obtain improved quality during rapid, high pressure forming of multi-stacked unidirectional prepreg. Particularly in aerospace applications, commonly used forming processes for multi-stacked unidirectional prepreg are often considered a bottleneck in production since the forming cycle requires both heating and cooling ramps and consequently takes long time—often about 1 h. It is possible to speed up the process by using elevated pressure and temperature. However, higher pressure and temperature also increase the influence of pressure gradient-driven, in-plane material movement (squeeze flow). This typically appears as radius thinning when forming a C-spar geometry on a male mold. Decrease of lay-up temperature will decrease radius thinning, but due to obstructed interply slippage, instead bending-induced wrinkles appear on the spar flange. In this article, tailored temperatures at the radius and in the flange area are introduced by using a hot lay-up and a cold mold. The results show that temperature differences of 6℃–10℃ between the radius area and the flange edge of the lay-up decreases radius thinning while still avoiding bending-induced wrinkles. Except from the radius temperature also the stacking sequence and the choice of prepreg system showed a significant influence on the radius thinning., QC 20220530

Lightweight and strong composite material beams are increasingly sought to quickly, easily, and cost-effectively transport and setup a variety of constructions such as bridges, cabins/stores/shelters, vehicles etc. For structural beams produced as conventional laminated composite materials, their weak areas tend to occur at intersections such as web-flange junctions due to absence of fibres bridging the interconnections. This drawback can however be overcome with development of profiled 3D textile reinforcements having combination architectures and constituent web-flange parts inherently mutually interconnected through fibre interlacement. In addition to general strength improvement, beams containing such novel reinforcement architectures also show increased energy absorption capability due to the mutual web-flange integration at the junctions. An 'I' and a 'flanged-triangle' cross-section beams were produced by a novel non-conventional weaving method, using carbon fibres as reinforcement, and their energy absorption capabilities were tested. These beams respectively absorbed over 50% and 300% more energy per weight in bending, compared to metal counterparts. This paper presents some relevant aspects of these innovative beams., QC 20191104

Lateral torsional buckling (LTB) is a common failure mode of large span beams. In this phenomenon, the beam becomes unstable along the unbraced length. This instability of beams can be identified by out-of-plane deflection and twisting. In this paper LTB strength of triangularly corrugated web beams under bending condition is investigated. Examined steel beams consist of two flanges and a thin triangularly corrugated web, connected by automatic welding. In the literature, the LTB strength problem of steel beams was dealt with mostly for steel beams with plate, sinusoidal and trapezoidal corrugated webs. Researches of the LTB behaviour of beams with triangularly corrugated webs were found out to be very limited. A parametric study is carried out for various beam spans and corrugation densities. A general-purpose finite element program (ABAQUS) was used. The corrugation densities adopted in this study represent practical geometries, which are common used for such structures in building practice. Plot showing the influence of compressed flange slenderness on value of reduction factor for LTB is presented. It is determined that existing buckling curves poorly describe the change of reduction factor depending on slenderness of compressed flange for triangularly corrugated web beams. Finally, recommendations were proposed for the design of simple supported steel beams with corrugated webs against lateral torsional buckling in accordance with numerical results. © Published under licence by IOP Publishing Ltd.

Incremental sheet forming is a novel technology that has significant benefits compared to conventional forming. However, it is a time-consuming process that is usually carried out in several forming stages to homogenize deformation and avoid material failure. In hole-flanging operations by SPIF, a single-stage strategy might provide functional flanges in considerably less time, however a non-uniform thickness is obtained along the flange. This work proposes a two-stage process as the best strategy to increase production rate, and an optimization methodology to produce a homogeneous thickness distribution of the flange. The procedure is used to automate the design process of parts and tool trajectories by CAD/CAM, and validate the optimal forming strategy by FEA

Incremental sheet forming is a novel technology that has significant benefits compared to conventional forming. However, it is a time-consuming process that is usually carried out in several forming stages to homogenize deformation and avoid material failure. In hole-flanging operations by SPIF, a single-stage strategy might provide functional flanges in considerably less time, however a non-uniform thickness is obtained along the flange. This work proposes a two-stage process as the best strategy to increase production rate, and an optimization methodology to produce a homogeneous thickness distribution of the flange. The procedure is used to automate the design process of parts and tool trajectories by CAD/CAM, and validate the optimal forming strategy by FEA

Incremental sheet forming is a novel technology that has significant benefits compared to conventional forming. However, it is a time-consuming process that is usually carried out in several forming stages to homogenize deformation and avoid material failure. In hole-flanging operations by SPIF, a single-stage strategy might provide functional flanges in considerably less time, however a non-uniform thickness is obtained along the flange. This work proposes a two-stage process as the best strategy to increase production rate, and an optimization methodology to produce a homogeneous thickness distribution of the flange. The procedure is used to automate the design process of parts and tool trajectories by CAD/CAM, and validate the optimal forming strategy by FEA

Incremental sheet forming is a novel technology that has significant benefits compared to conventional forming. However, it is a time-consuming process that is usually carried out in several forming stages to homogenize deformation and avoid material failure. In hole-flanging operations by SPIF, a single-stage strategy might provide functional flanges in considerably less time, however a non-uniform thickness is obtained along the flange. This work proposes a two-stage process as the best strategy to increase production rate, and an optimization methodology to produce a homogeneous thickness distribution of the flange. The procedure is used to automate the design process of parts and tool trajectories by CAD/CAM, and validate the optimal forming strategy by FEA

Incremental sheet forming is a novel technology that has significant benefits compared to conventional forming. However, it is a time-consuming process that is usually carried out in several forming stages to homogenize deformation and avoid material failure. In hole-flanging operations by SPIF, a single-stage strategy might provide functional flanges in considerably less time, however a non-uniform thickness is obtained along the flange. This work proposes a two-stage process as the best strategy to increase production rate, and an optimization methodology to produce a homogeneous thickness distribution of the flange. The procedure is used to automate the design process of parts and tool trajectories by CAD/CAM, and validate the optimal forming strategy by FEA

Purpose This paper presents an investigation conducted to evaluate the effects of important parameters affecting the structural fire performance of LSF walls. It also evaluates the applicability of commonly used critical hot flange temperature method to determine the Fire Resistance Ratings (FRR) of different LSF walls. Design/methodology/approach The effects of important parameters such as stud section profiles and their dimensions, elevated temperature mechanical property reduction factors of the steel used, types of wall configurations and fire curves on the FRR of LSF walls were investigated. An extensive finite element analysis based parametric study was conducted to evaluate their effects. For this purpose, finite element models which were validated using the full scale fire test results were used. Using the structural capacities obtained from finite element analyses, the load ratio versus FRR curves were produced for all the different LSF walls considered. Findings Stud depth and thickness significantly affected the fire performance of LSF walls due to the differences in temperature development pattern, thermal bowing deflections and the failure modes of stud. The FRR of LSF walls increased significantly when steel studs with higher elevated temperature mechanical property reduction factors were used. FRR significantly changed when realistic design fire curves were used instead of the standard fire curve. Furthermore, both the critical hot and average flange temperature methods were found to be unsuitable to predict the FRR of LSF walls. Originality/value The developed comprehensive fire performance data would facilitate the development of LSF walls with enhanced fire performance and importantly it would facilitate and advance the successful applications of HFC section studs in LSF walls. © Emerald Group Publishing Limited.

It is widely known that the shear strength of a reinforced concrete (RC) or prestressed concrete (PC) beam results from the interaction of different resisting actions. Thus, available simplified shear models emphasize different resisting actions. The model described herein is a simplification of the multi-action shear model the authors developed. The authors' shear model is expressed in the form of easy-to-use equations while maintaining its sound mechanical background. The nominal shear strength provided by concrete Vc is given by only one equation that is valid for RC and PC members with and without axial loads; with and without transverse reinforcement; and with I, T, or rectangular cross sections. The model takes into account the beneficial influence of the compression flanges as well as the confinement of the compression chord provided by the stirrups. Cladera et al describing the model derived as a compromise between simplicity and accuracy., Peer Reviewed, Postprint (author's final draft)

Sheet metal forming in the car industry is a highly competitive area. The use ofdigital techniques and numerical methods are therefore of high interest for reduced costs andlead times. One method for reducing the try-out phase is virtual rework of die surfaces. Thevirtual rework is based on Finite Element (FE) simulations and can reduce and support manualrework. The elastic behaviour of dies and presses must be represented in a reliable way in FEmodelsto be able to perform virtual rework. CAD-models exists for nearly all dies today, butnot for press lines. A full geometrical representation of presses will also yield very large FEmodels.This paper will discuss and demonstrate a strategy for measuring and characterizing apress table for inclusion in FE-models. The measurements of the elastic press deformations iscarried out with force transducers and an ARAMIS 3D optical measurement system. The presstable is then inverse modelled by topology optimization using the recorded results as boundaryconditions. Finally, the press table is coupled with a FE-model of a die to demonstrate itsinfluence on the deformations. This indicates the importance of having a reliable representationof the press deformations during virtual rework., open access

Dual-Phase (DP) steels are today used in the automotive industry due to its large strength to weight ratio. However, the high strength of DP-steel does have a negative impact on the general formability in sheet metal forming. Unfavourable process conditions in the press shop will, on top of this, reduce the formability of DP-steels even more. This paper addresses the problem of edge fracture in stretch flanges in sheet metal parts made of DP-steel. The experimental part involves tests of ten different DP590 and DP780 steel grades with three different shear cut qualities. The influence on the fracture strain of the sample orientation of the shear cut are also studied by facing the burr away or towards the punch and testing samples with the cut edge parallel with the rolling direction and the transverse direction. The strains are measured with an ARAMIS system in each test, together with punch displacement and punch force. All tests are then simulated with AutoFormplus R7 and the results from these simulations are compared with the experimental results in order to find the appropriate failure strain for each combination of supplier, coating, thickness and shear cut quality. © Published under licence by IOP Publishing Ltd.

1. Meetings: i. Participated in weekly conference calls. ii. Design Review 16 2. The following Shipyard Question Submittals were reviewed and commented on: No questions this reporting period. 3. Logistics: i. Continuing to review Vendor Recommended Spares (VRS). ii. Continuing to review Technical Manuals and Supplemental Information. iii. Continuing to work on initial outfitting lists for Sally Ride. iv. Working on NS5 Hierarchy 4. Sally Ride Progress: HVAC Ducting installation is moving forward with large sections of ductwork being installed on the main deck port and starboard. HVAC crew is laying out runs on the foc sle and 01 decks. Pilot House Void overhead insulation has been completed. In addition to the necessary fire protection, the insulation has excellent sound deadening properties, resulting in a much quieter Pilot House deck. Electrical Yard continues to mount and stage panels and controllers throughout the vessel. Shore Power connection mounted on Main Deck. Very little cabling is being run at this time as most of the yard electricians are on Armstrong. During today s walk through, no electricians were seen on board Ride. Transceiver Room EK80 cable tray installed in way of fuel tank. Painting throughout the vessel continues.

1.Meetings: i. Participated in weekly conference calls. ii. Participated in weekly yard meeting with yard and GPA. iii. Attended CAST-6 Demonstration at Markey iv. Attended Phase III Discussions at DCI 2. The following Shipyard Question Submittals were reviewed and commented on: Q93 Monel Topside Flange Fasteners: J-1 Appendix B, under notes: flange bolting exposed to weather shall be monel. Dakota Creek would like to propose using CRES 304SS application for all flange bolts exposed to weather in lieu of Monel. Monel is over engineering and DCI believes CRES 304SS won't lock up or corrode when exposed to seawater. This material request would be consistent with the application already used throughout the vessel. SIO responded that it is acceptable to use CRES in lieu of Monel, but would prefer 316 Stainless Steel to 304 due to its greater resistance to chloride corrosion. 3. Logistics: i. Continuing to review Vendor Recommended Spares (VRS). ii. Continuing to review Technical Manuals and Supplemental Information. iii. Continuing to work on initial outfitting lists for Sally Ride. 4. Other Work Items: HMR 20, Second Galley Oven Waiting on final approval. HMR 21, Stand-alone Autopilot No new informations at this time. Scientific Refrigeration Boxes - No changes since last reporting period Mast Vibration excessive vibration noted on Armstrong s Pole Mast (RAM/NUC Nav Light Mast). Video submitted showing the effect of a light winds on the mast. DCI has since welded a cross piece on Sally Ride s mast to see if this will reduce or eliminate the vibration. Machining continues stern tubes. Markey CAST-6 Demo Attended demo for both of Ride s CAST-6 winches at Markey. Trip report submitted to PME.

The radiation from a rectangular waveguide with a perfectly conducting infinite flange is determined using the modal decomposition matrix (MDM) method. This method uses the tangential boundary condition at the aperture to directly compute the far-field radiation patterns. The fields in the waveguide are expanded in terms of waveguide modes consistent with the approach of Felsen and Marcuvitz. The radiated field is expanded as an inverse Fourier transform and represented at the aperture in terms of the discretization of the free-space transverse wave number. The results of the MDM approach are compared to numerical models using commercial software., The original document contains color images.

The use of high density hardwood species for furniture and interior purposes can be limited because the weight. Keeping the weight low is important both from a user perspective and for logistic reasons in the manufacturing and distribution process. This work describes the construction and mechanical characteristics of a new type of light-weight panel in wood. The panel is a sandwich construction in three layers with hardwood as the surface layers. The surface layers are made of 6 mm thick solid beech and the core consists of solid pine wood in thicknesses of 24 or 96 mm cross-laminated to the surfaces. The total panel density was then 373 and 294 kg/m3 given a beech surface layer with a density of 725 kg/m3. The presented light-weight panel resulted in a 50-60 % decrease in the use of wood compared to a traditional edge-glued panel. Tests of the mechanical properties showed a bending stiffness in the longitudinal direction (of the core) of 2.9 kNm2 for a 36 mm thick panel and 221 kNm2 for a 108 mm thick panel. In the transverse direction, the corresponding values were 11 kNm2 and 88 kNm2. The overall results indicate that the light-weight panel presented shows promising technical and environmental properties and can thereby contribute to an increased use of hardwood species.

It is proved that Birger's formula can be used to analyze the compliance of a flange and to design the HPR-IPR coupling of K-300-240 KhTZ turbine-generator set. © 2013 Springer Science+Business Media New York.

The use of high density hardwood species for furniture and interior purposes can be limited because the weight. Keeping the weight low is important both from a user perspective and for logistic reasons in the manufacturing and distribution process. This work describes the construction and mechanical characteristics of a new type of light-weight panel in wood. The panel is a sandwich construction in three layers with hardwood as the surface layers. The surface layers are made of 6 mm thick solid beech and the core consists of solid pine wood in thicknesses of 24 or 96 mm cross-laminated to the surfaces. The total panel density was then 373 and 294 kg/m3 given a beech surface layer with a density of 725 kg/m3. The presented light-weight panel resulted in a 50-60 % decrease in the use of wood compared to a traditional edge-glued panel. Tests of the mechanical properties showed a bending stiffness in the longitudinal direction (of the core) of 2.9 kNm2 for a 36 mm thick panel and 221 kNm2 for a 108 mm thick panel. In the transverse direction, the corresponding values were 11 kNm2 and 88 kNm2. The overall results indicate that the light-weight panel presented shows promising technical and environmental properties and can thereby contribute to an increased use of hardwood species.

The use of high density hardwood species for furniture and interior purposes can be limited because the weight. Keeping the weight low is important both from a user perspective and for logistic reasons in the manufacturing and distribution process. This work describes the construction and mechanical characteristics of a new type of light-weight panel in wood. The panel is a sandwich construction in three layers with hardwood as the surface layers. The surface layers are made of 6 mm thick solid beech and the core consists of solid pine wood in thicknesses of 24 or 96 mm cross-laminated to the surfaces. The total panel density was then 373 and 294 kg/m3 given a beech surface layer with a density of 725 kg/m3. The presented light-weight panel resulted in a 50-60 % decrease in the use of wood compared to a traditional edge-glued panel. Tests of the mechanical properties showed a bending stiffness in the longitudinal direction (of the core) of 2.9 kNm2 for a 36 mm thick panel and 221 kNm2 for a 108 mm thick panel. In the transverse direction, the corresponding values were 11 kNm2 and 88 kNm2. The overall results indicate that the light-weight panel presented shows promising technical and environmental properties and can thereby contribute to an increased use of hardwood species.

The use of high density hardwood species for furniture and interior purposes can be limited because the weight. Keeping the weight low is important both from a user perspective and for logistic reasons in the manufacturing and distribution process. This work describes the construction and mechanical characteristics of a new type of light-weight panel in wood. The panel is a sandwich construction in three layers with hardwood as the surface layers. The surface layers are made of 6 mm thick solid beech and the core consists of solid pine wood in thicknesses of 24 or 96 mm cross-laminated to the surfaces. The total panel density was then 373 and 294 kg/m3 given a beech surface layer with a density of 725 kg/m3. The presented light-weight panel resulted in a 50-60 % decrease in the use of wood compared to a traditional edge-glued panel. Tests of the mechanical properties showed a bending stiffness in the longitudinal direction (of the core) of 2.9 kNm2 for a 36 mm thick panel and 221 kNm2 for a 108 mm thick panel. In the transverse direction, the corresponding values were 11 kNm2 and 88 kNm2. The overall results indicate that the light-weight panel presented shows promising technical and environmental properties and can thereby contribute to an increased use of hardwood species.

The use of high density hardwood species for furniture and interior purposes can be limited because the weight. Keeping the weight low is important both from a user perspective and for logistic reasons in the manufacturing and distribution process. This work describes the construction and mechanical characteristics of a new type of light-weight panel in wood. The panel is a sandwich construction in three layers with hardwood as the surface layers. The surface layers are made of 6 mm thick solid beech and the core consists of solid pine wood in thicknesses of 24 or 96 mm cross-laminated to the surfaces. The total panel density was then 373 and 294 kg/m3 given a beech surface layer with a density of 725 kg/m3. The presented light-weight panel resulted in a 50-60 % decrease in the use of wood compared to a traditional edge-glued panel. Tests of the mechanical properties showed a bending stiffness in the longitudinal direction (of the core) of 2.9 kNm2 for a 36 mm thick panel and 221 kNm2 for a 108 mm thick panel. In the transverse direction, the corresponding values were 11 kNm2 and 88 kNm2. The overall results indicate that the light-weight panel presented shows promising technical and environmental properties and can thereby contribute to an increased use of hardwood species.

The relative complex permittivity can be extracted with time domain data from a perfect electrical conductor (PEC) backed sample of a low-loss, non-dispersive dielectric using dual ridged waveguide aperture probes with attached PEC flange plates of the same geometry and different dimensions. The temporal domain measurement of interest is the ability to detect the reflection from the edge of the flange plate in the parallel region created by the flange plate and the PEC backing on the dielectric sample. Signal processing windows are applied to the data in order to exploit this edge reflection. The types of signal processing methods used and the geometry and size of the flange plate help identify the edge reflection. Measurements are taken using square and circular flange plates of different dimensions. Measured data is then processing using Kaiser and Blackman-Harris windows to show the edge reflection. A simple extraction technique for the permittivity is used and compared with industry standard values., The original document contains color images.

PLANNING CONSIDERATIONS: Enclosure * Location of Room * Completely Inside * Room Inside, Collector Outside * Completely Outside * Partially Outside * Recovery System Location * On Top of Existing Floor * Flush-Mounted (Recovery System In Pit) ... CLEMCO WORLDWIDE ... The demand for abrasive blasting is extensive. Ship building and maintenance in Singapore, construction in Saudi Arabia, refining in Houston... these are but a few of the major industries where abrasive blasting has kept pace with demand calling for Clemco specialization and innovation. Manufacturing and distribution throughout 6 continents... wherever there is industry, Clemco is there., Presented at the U.S. Army Corrosion Summit, Huntsville, AL, 9-11 Feb 2010. Document consists entirely of briefing charts. U.S. Government or Federal Rights License. The original document contains color images.

La presente ponencia muestra la investigación desarrollada sobre la existencia, homogeneidad y aplicación de la representación gráfica de diferentes tipos de elementos propios de instalaciones de fluidos en el ámbito de la Ingeniería Química. Las tuberías son elementos fundamentales en la mayoría de instalaciones industriales relacionadas con la rama química. Conocer cómo desarrollar estas instalaciones para fluidos y su correcta forma de representación son aspectos importantes que los técnicos deben conocer. La representación de instalaciones de fluidos en cualquiera de sus formas de representación, requiere utilizar simbología específica que pueda ser interpretada por cualquier técnico. En investigaciones anteriores se analizó la heterogeneidad de normas en cuanto a la representación de válvulas, se pretende en esta investigación centrarnos en otros elementos propios de estas instalaciones como bombas y bridas. En la actualidad, existen diversas normativas de ámbito nacional y/o internacional de representación de elementos de instalaciones de fluidos, sobre todo en el ámbito del 2D. Analizando esta normativa se encuentra una gran disparidad en cuanto a la simbología utilizada o la ausencia de una norma específica. El desarrollo constante de software donde se usan símbolos gráficos para la representación de estas instalaciones, hace que incluyan en sus bases simbología propia no siempre referida a unas normas, tanto en 2D como en 3D. En esta ponencia se ha analizado la diferente normativa existente referente a la representación gráfica de bombas hidráulicas, así como otros elementos de instalaciones de fluidos, para hacer un análisis de las diferencias y similitudes entre ellas y compararlas con la aplicación que de ellos se hace en diversos programas informáticos que en la actualidad se comercializan., The aim of this paper is to show the research undertaken on the existence, homogeneity and application of the graphical representation on different types of pumps in the industrial realm. There exist different regulations of the representation of pumps, some more widespread than others, depending on the typology they comprise. The increasing use of both 2D or 3D new technologies has influenced the market to promote the increase of 2D and 3D programmes, specially for the representation of pumps and flanges, as well as other elements. The majority of those computer programmes have basic libraries and files that include the representation of these elements. With this paper we aim, firstly, to offer a compilation of the regulations applied in the representation of pumps; secondly, we want to show the similarities and differences amongst them, and to compare them with the applications of pumps done by programmes such as CadPipe, Cadworx, Autocad, and so on, analysing, finally, which of those applications would be the best. Moreover, we are widening up our research with a study on the real applicability in the business and industry realm, when it comes to representing graphically the pumps in their projects.

La presente ponencia muestra la investigación desarrollada sobre la existencia, homogeneidad y aplicación de la representación gráfica de diferentes tipos de elementos propios de instalaciones de fluidos en el ámbito de la Ingeniería Química. Las tuberías son elementos fundamentales en la mayoría de instalaciones industriales relacionadas con la rama química. Conocer cómo desarrollar estas instalaciones para fluidos y su correcta forma de representación son aspectos importantes que los técnicos deben conocer. La representación de instalaciones de fluidos en cualquiera de sus formas de representación, requiere utilizar simbología específica que pueda ser interpretada por cualquier técnico. En investigaciones anteriores se analizó la heterogeneidad de normas en cuanto a la representación de válvulas, se pretende en esta investigación centrarnos en otros elementos propios de estas instalaciones como bombas y bridas. En la actualidad, existen diversas normativas de ámbito nacional y/o internacional de representación de elementos de instalaciones de fluidos, sobre todo en el ámbito del 2D. Analizando esta normativa se encuentra una gran disparidad en cuanto a la simbología utilizada o la ausencia de una norma específica. El desarrollo constante de software donde se usan símbolos gráficos para la representación de estas instalaciones, hace que incluyan en sus bases simbología propia no siempre referida a unas normas, tanto en 2D como en 3D. En esta ponencia se ha analizado la diferente normativa existente referente a la representación gráfica de bombas hidráulicas, así como otros elementos de instalaciones de fluidos, para hacer un análisis de las diferencias y similitudes entre ellas y compararlas con la aplicación que de ellos se hace en diversos programas informáticos que en la actualidad se comercializan., The aim of this paper is to show the research undertaken on the existence, homogeneity and application of the graphical representation on different types of pumps in the industrial realm. There exist different regulations of the representation of pumps, some more widespread than others, depending on the typology they comprise. The increasing use of both 2D or 3D new technologies has influenced the market to promote the increase of 2D and 3D programmes, specially for the representation of pumps and flanges, as well as other elements. The majority of those computer programmes have basic libraries and files that include the representation of these elements. With this paper we aim, firstly, to offer a compilation of the regulations applied in the representation of pumps; secondly, we want to show the similarities and differences amongst them, and to compare them with the applications of pumps done by programmes such as CadPipe, Cadworx, Autocad, and so on, analysing, finally, which of those applications would be the best. Moreover, we are widening up our research with a study on the real applicability in the business and industry realm, when it comes to representing graphically the pumps in their projects.

Práce se zabývá tvarovou optimalizací vybraných částí výdejního ramene pohonných hmot použitím metody konečných prvků (MKP). Obsahuje návrh nových tvarů vybraných částí, kontrolu pevnosti a únavy. Následně vyhodnocuje získané výsledky., This diploma thesis is focused on spare part optimalization of the delivery arm of fuel using finite element method (FEM). It contains new shape design of chosen parts, test on strength and fatigue. Consequently, it resumes results., Katedra dopravních prostředků a diagnostiky, Dokončená práce s úspěšnou obhajobou

An apparatus as a fixture for fluidly pressure testing a flange penetrator seal with the apparatus having a flange cover including a recess and a flange extension including a recess with the extension matable to the cover such that the recesses create a volume around the seal. The extension is secured to the flange of a device for which the flange penetrator seal supports. The cover has a pressure fitting for application of fluid pressure to the recess of the cover for pressure testing the seal within the volume and the extension having a fitting for draining the volume after testing is complete. The test fixture includes a clamping fixture attachable to the cover, the clamping fixture encompassing the flange cover and the extension such that the apparatus can be further secured to the flange of the device which the flange penetrator seal supports.

A trailer axle has steerable wheels that rotate on hub assemblies pivotally mounted to the axle. Connected to the axle is a mechanism for controlling the pivoting of the hub assemblies and thereby limiting the extent to which the steerable wheels turn. The mechanism has a rod disposed along the axle and pivotally connected to the hub assemblies. A bracket on the axle has an aperture through which the rod passes, the aperture permitting the rod's motion both parallel to the axle and transverse to the axle. Flanges on the rod span an opening of the aperture and slidingly engage the bracket. The flanges are translatable on the bracket transversely to the axle but are immobile in a direction parallel to the axle. The mechanism has collars at the ends of the rod and two elongate coil springs encircling the rod. One end of each spring is affixed to the collar and the other end of each spring is affixed to the flange. The springs bias the rod and hub assemblies toward a position where the hub assemblies and wheels are oriented at a desired steering angle. The position of the collars on the rod can be adjusted to vary the bias of the spring. Adjusting the collars' positions also controls the distance between the springs' coils and thereby ultimately controls the degree of steering of the wheels., United States Patent No.: US 6,916,029 B2

Unreinforced masonry (URM) buildings constructed on Army installations before the development of modern seismic codes may be susceptible to earthquake damage and therefore could benefit from seismic mitigation measures. Improved understanding of URM structural response under multidirectional loads is required to develop the most effective seismic structural retrofit strategies. This research used a half-scale structural model to investigate the seismic response of URM buildings with flexible diaphragms. The objectives were to determine failure mechanisms and deformation behaviors; examine amplification of ground motion acceleration by walls and diaphragms; approximate any strength effects that flange portions of out-of-plane walls may have on in-plane walls; investigate vertical distribution of lateral forces; and identify any combinational effects of multidirectional base motions. An unexpected level of out-of-plane wall flange contribution to in-plane wall strength indicates the need for experimental quantification using different pier layouts, URM wall combinations, and wall connection methods. Results also indicate the need to investigate the effect of overturning forces on the in-plane strength of piers and to determine critical ground motion characteristics that lead to the direct combination of response quantities due to orthogonal earthquake components., The original document contains color images.

High layer quality GaN NDR layers have been grown in house by newly setup MOCVD facility. Record quality AIN layers were grown for high thermal conductivity substrateless diodes with improved thermal management. GaN Gunn diodes were designed and fabricated on Si substrates with high thermal conductivity. Combined with the use of small size devices they allowed to bias GaN NDR diodes under electric fields suitable for oscillation. Liquid Nitrogen Characterization of GaN NDR diodes manifested clear increase of current handling as necessary for establishment of NDR conditions. Planar GaN NDR diodes have been investigated as an alternative to vertical designs. InGaN/GaN superlattice designs have been theoretically and experimentally investigated for THz signal generation. Pulse generation setups have been developed to respond to high power, nsec time needs of GaN NDR diodes. On wafer probe techniques with built-in resonators have been investigated for high frequency testing of NDR diodes. Experimental micromachining technology was developed for silicon. Waveguide, probes, transitions and flanges developed and tested in W band. Excellent experimental results were obtained in W band. Nearly finished with corresponding GaAs process technology. Technology demostration was made with complete W band multiplier.

Competition in aeronautical propulsion imposes new challenges in terms of maintenance costs and product availability. Within the HP turbine design process, aero-thermal engineers are given only a short time in which to propose adequate solutions for HPT blade cooling air supply systems. The industrialization of the SAVIRAT chain at SNECMA MOTEURS offers opportunities for applying Navier-Stokes calculations which are now compatible with the quality and time constraints of a project design phase. One clear way to improve the life time of HPT disks is to remove hooks between the forward sealing plate and the HPT disk itself. In addition to its main mechanical function, this device also optimizes the relative speed of the HPT blade cooling air before it enters the slot bottoms. This document details the contribution made by Navier-Stokes three-dimensional (3D) analyses during the HPT disk design phase, in the event of a simple contact, without hooks, between the forward flange and the disk rim. A fluid and solid wall 3D mesh represents the HPT cooling air supply system, from the forward sealing plate exit holes to the entry of the cooling air in the blade root. Calculations were carried out under adiabatic conditions. Models were created for several configurations. These led the authors to draw the following conclusions: where a "no hook" device is used, analysis reveals a vortex phenomenon due to bailing; in the case of a conventional solution with hooks, the vortex phenomenon disappears and the pressure distribution in the slot bottoms is homogenous; and fitting blade roots with axial air deflectors restores air supply quality in slot bottoms. Some applications may have a significant impact on the optimization of components in terms of efficiency or maximizing life time. Secondary flows of turbine rotors are one of the most interesting fields of application. (1 table, 4 refs.), Also see ADM001490. Presented at the RTO Applied Vehicle Technology (AVT) Panel Symposium held in Loen, Norway, on 7-11 May 2001. Published in report number RTO-MP-069(I). The original document contains color images.

The subject of this research is the buckling behavior of a simply supported rectangular plate, with a bulb-flat stiffener attached to one side of the plate The plate structure is subjected to axial compression that increases to the buckling load, The stiffener cross-section has a thin web and a bulb-flat flange that extends to one side of the web, Results of the investigation include planar property formulas for the asymmetric flange geometry, an analytic expression for the Saint Venant torsional constant of the flange cross-section, and an analytic expression for the buckling load corresponding to a tripping mode of the structure, The torsional constant for the bulb-flat stiffener is 15% - 23% higher than understood previously, The analytic expression for the buckling load of the bulb-flat stiffened plates considered in this investigation yields values that are 2% - 6% higher than finite element results, It is also shown that the buckling load of a plate with a bulb-flat stiffener is 3% - 4% less than that of a plate with a T-flange stiffener with the same cross-sectional area, At the onset of stiffener tripping, the torsionally superior bulb-flat tends to bend laterally, while the flexurally superior T-flange tends to twist., The original document contains color images.

The objective of the AIM-C Program is to provide concepts, an approach, and tools that can accelerate the insertion of composite materials into DoD products., Sponsored in part by DARPA/DSO. The original document contains color images.

This document contains briefing charts on the Accelerated Insertion of Materials - Composites (AIM-C). Topics covered include a summary of progress to date: accurately predicted laminate stiffness, accurately predicted typical unnotched and open hole strengths, demonstrated deterministic studies and validated against data and demonstrated mechanics to perform statistical studies. Near future plans include expanding validated predictive capability to bonded and bolted joint elements and laminates, expanding durability analysis and predicting open hole property scatter. Long term plans include accurately predicting strength of user-defined geometry and a deterministic study capability for user-defined geometries., The original document contains color images. Prepared in cooperation with Northrop Grumman, Material Sciences Corporation, Convergent Manufacturing Technologies, Cytec Fiberite, Inc., Massachusetts Inst. of Tech. and Stanford Univ. Presented at the International SAMPE Technical Conference (34th) held in Baltimore MD on 4-7 November 2002.

This article presents an overview of current research and material requirements for Metal Matrix Composite (MMC) technologies being developed for application to Liquid Rocket Engines (LIRE). Developments in LRE technology for the US Air Force are being tracked and planned through the Integrated High Payoff Rocket Propulsion Technologies Program (IHPRPT). Current efforts and research requirements for three types of MMC systems are discussed: Aluminum., Copper and Nickel matrix material systems. Potential applications include turbopump housings, rotating machinery and high stiffness flanges and ductwork

A break-away end cap assembly includes a tube member of predetermined characteristics and an end cap member for releasably securing the open end of the tube member. An annular recessed groove is formed in the inner surface of the tube member. The end cap member includes an outer flange portion having an outer peripheral surface consistent in diameter with an outer diameter of the tube member and a coy portion depending from the outer flange portion. At least one recessed opening is laterally formed within the body portion with a pilot hole formed at the base end of each recessed opening. A normally biased spring member is seated in a base of the recessed opening and a retractable pin is positioned over the normally biased spring member. The retractable pin has an outer beveled surface end which seats within the annular recessed groove and is held therein with the normally biased pressure of the spring member until a force greater than the normal bias of the spring member is applied against the inner surface of the end cap.

A vibration isolating flange mount assembly for a pipe has a vibration absorbing gasket and fastener recesses having a vibration dampening material disposed therein to provide a fluid seal between the pipe and a flooded structure and to isolate pipe vibrations., Supersedes PAT-APPL-08 976 133-97, AD-D018 856.

The invention pertains to angularly spaced Sector portions of a bushing element attached by its annular flange to a housing, adjustably positions angularly spaced bearing elements and wedge shaped spacers for bearing support of a shaft with desired radial and axial clearances maintained by fasteners extending into the housing parallel to the shaft axis horn the flanges of the bushing and the bearing elements to accommodate radial adjustment, while fastener studs extending perpendicular to the shaft axis through enlarged holes in all of the elements of the hearing assembly accommodate axial adjustment before attachment of the bearing elements in their adjusted positions to the housing is finalized., Supersedes PAT-APPL-885 132-97.

A wide range of alloys is being evaluated for use in a new generation of seawater valves for the U.S. Navy. This new generation of valves is being developed to reduce valve life cycle costs and to ensure materials compatibility with advanced seawater piping materials such as commercially pure titanium. Part of the evaluation includes assessing the corrosion performance of candidate valve materials. Crevice corrosion performance is of particular interest since valves are connected to shipboard piping systems with flanges and since valves contain numerous internal crevices. Crevice corrosion tests were performed in constant temperature, natural seawater under both quiescent and flowing conditions. Bronze, copper-nickel, and nickel-copper alloys, which are currently used in Navy valves, were used as standards by which the performance of stainless steel, nickel-base, titanium, and cobalt alloys could be measured. No crevice corrosion was observed on any of the titanium or cobalt alloys tested while the stainless steel and nickel-base alloys ranged from fully resistant to highly susceptible. Wrought alloys were typically more resistant to crevice corrosion than their cast equivalents.