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Induction motor (IM) is a complex controlled object that is difficult to drive and control. In this paper, direct torque control strategy (DTC) is adopted to drive IM. In order to overcome drawbacks of the bad low speed performance of DTC system, Tornambe control (TC) is used to replace the traditional speed regulator to improve system performance. The results show that TC strategy overcomes the disadvantage of the low speed performance declined and improves the response speed of DTC system, and effectively solves the contradiction between the system response speed and overshoot.

The purpose of this research is to find propagation rules and development of shock wave caused by roof caving in goaf. The test equipment which was used consisted of high-speed camera and schlieren system. Different kind of roadways have been designed to discuss the propagation rules and development of falling shock wave in different roadway.The results of the experiment indicated that no matter what kind of roadway the shock wave in, the propagation process can roughly divide into two stages. In the first stage, the velocity of shock wave is slower than the second stage and the face of shock wave are clearer, the lines are smoother. But in the second stage, the velocity of shock wave are faster than the first stage and there are many whirls, the lines are more tiny and chaotic. Further research into shock wave caused by roof caving in goaf is necessary.

In order to monitor the operating status of the circuit breaker, designed a multi-signal processing system based on the labview. The system acquisite multiple signals synchronous, and combined with MATLAB. Signal feature is extracted with time domain eigenvalues, EEMD decomposition, wavelet decomposition, and finally sent into ELM. The results demonstrate: that the system can achieve the accurate judgment of the operation state of the circuit breaker.

Aim at the disadvantages of traditional circuit breaker mechanical characteristic parameters test. Get the motion pictures of insulation connecting rod through high-speed camera, using the finite difference method to quickly screen out the motion pictures, and selecting punctuation area as a template for learning, using non-uniform sampling have a template matching, obtain the center coordinates of matching results, time interval is known every frame. Through coordinate changes over time we can obtain mechanical parameters of the circuit breaker accurately, fast, conveniently. Lab VIEW programs achieve the above process automatically.

Pulse width modulation (PWM) technology based on rotating coordinate transform is a new type of rectifier control method. Through the electromagnetic transient process of the analysis of the rectifier circuit we can verify the accuracy of this control method. Therefore, this paper first analyzed electromagnetic transient process of the rectifier circuit. By changing the phase and amplitude of voltage to realize the active and reactive power decoupling control independently. Than,it built the simulation model of rectifier circuit with the electromagnetic transient analysis software PSCAD. This cricuit is controlled by PWM based on double closed-loop vector. The simulation and analysis of the circuit are performed on the basis of the model. The simulation results can reflect the electromagnetic transient process of the circuit accurately,so as to verify the correctness of the proposed control method to control the rectifier circuit.

Aimed at the analysis of the ion changes of the North east block in Lamadian oilfield asp flooding field in different period, we puts forward a new and more effective anti-scale agent combined with actual situation on site and the design method of the drug concentration. By combining the extraction liquid ion anti-scale indoor simulation experiment, the changes of different scale anti-scale agent dosing concentration during the period of experience formula. And the north east block in Lamadian oil field, the application of asp flooding experiment, achieved good anti-scaling effect, because of the scale pump inspection cycle to achieve an average of 300 days or more.

According to the gypsum mine goaf disaster formation mechanism and failure characteristics, wireless monitoring system of gypsum mine goaf was designed successfully by using virtual instrument technology, modern sensor technology, wireless transmission technology and the LabVIEW programming language. By using high-precision sensors to acquire dynamical data of monitoring projects, combined with wireless transmission technology to realize the automatic wireless real-time telemetry, using the graphical programming language LabVIEW to develop a software with friendly interface and convenient operation, the monitoring system can timely reflect the dynamic changes of the goaf and forecast the potential safety hazard, to ensure the safety in production of gypsum mine.

Deep foundation pit engineer is characterized with high risk, and it is important to have a study on the risk management of deep foundation pit engineering. Risk Measurement, Risk Assessment and Risk Control of Deep Foundation Pit Engineering is very necessary. There is a need to establish a set of operational foundation pit engineering risk management system to comprehensively and accurately identify and measure the risks of deep foundation pit engineering; and conduct risk control on the basis of risk analysis. Using engineering testing technology, establishes a monitoring based deep foundation pit engineering risk management mode.

A series of silicon (VI) porphyrins compounds with varying meso substitutions Si (TPP)Cl2 (where X=5,10,15,20-tetraphenylporphyrin), Si (TFP)Cl2 (X=5,10,15,20-tetrafluorenylporphyrin), Si (TQP)Cl2(X=5‚10‚15‚20-tetra (2,3,6,7-tetrahydro-1H,5H-benzo [ij] puinolizine) porphyrin),Si (TMP)Cl2(X=5,10,15,20-tetra (N,N-dimethylphenyl) porphyrin) have been investigated using density functional theory (DFT) to assess the influence of ruffled conformation on the electronic structures, frontier molecular orbital, charge carrier transport, electronic spectra. The electronic structures reveal that all these Si porphyrins display visible ruffling distortion, as the dihedral angle Cα2-N2-N4-Cα4 are ca. 30 ̊. And calculations confirm that ruffed distortion result in higher LUMO energies, lower EA values than corresponding planed Zn porphyrins, especial for similar λhole and λelectron values. These calculations suggest that the ruffled conformation bring about better charge injection and transport, which would broaden the application of distorted porphyrin in several different fields.

The sliding mode control (SMC) design is discussed for a class of time-varying delay systems which is delay-range-dependent and rate-range-dependent. A novel time-varying nonlinear sliding surface is employed. The choice of nonlinear sliding surface is to change the state matrix of sliding mode system, which can combine the advantages of different conventional linear sliding surfaces. Thus the better transient qualities of system states, i.e., quicker response and smaller overshoot, can be achieved. The sufficient conditions ensuring the asymptotic stability of sliding mode are derived in terms of linear matrix inequalities. The algorithms deciding unknown parameters of the nonlinear sliding surface and the corresponding sliding mode controller are also presented. Finally, A numerical example is given to illustrate the effectiveness of the result here.

In this paper, carry on a reasonable assumption on photovoltaic/thermal (PV/T) system and establish a one-dimensional mathematical model of heat pipe PV/T systems based on the low of energy conservation. Conduct a numerical simulation of the temperature of glass cover-plate and the water in a tank on a certain condition (the flow is 250L/h, volume of the tank is 50L, initial temperature of supply water is 24°C). Build a comprehensive test-bed of heat pipe PV/T system and study the influence of different conditions on the system with control variate method, such as initial temperature, the yield of circulating water and the way of water storage. Generating capacity and quantity of heat and their efficiency can be obtained by put the parameter of Tianjin typical meteorological year into the mathematical model. The results shows that the average generating efficiency of heat pipe PV/T system is 17% and the average thermal efficiency is 23.8% and that the comprehensive efficiency can reach to 40.8%.

In order to research the resistance characteristic of silicon-based composite tiles under high temperature thermal load on aircraft during its reentry into the earth's atmosphere, the ordinary resistance measurements were comparatively discussed according to the operational environment of composite, two parallel electrodes probe test method was proposed, and the resistance test platform under high temperature thermal load was developed, by which the resistance characteristic of silicon-based composite tiles was continuous monitored under different thermal load. The result shows that: If the temperature is not higher than 600°C, the resistance will increase with the decrease of temperature until it reached the resistance value at room temperature; If the temperature is higher than 700°C, the resistance characteristic will be changed everlastingly; If the temperature is higher than 800°C, the resistance will be less than 1kΩ and will not change any more.

In order to analyze the steering dynamic characteristic of the skid steer loader, refer to the theory of tracked vehicle, established the steering Kinematic and dynamic models. use AMESim software platform and Motion software platform to establish a Co-Simulation model of steering system based on theoretical analysis of skid steer loader steering travel. The results show that: the model can predict the dynamic characteristics of the skid steer loader skid steering process.

To fault diagnosis of diesel engine, put forward a fault diagnosis of diesel engine based on EEMD difference energy spectrum of singular value and RBF. Nonstationary original acceleration vibration signal of kinds of diesel engine’s working condition is separated to several IMF and structure a Hankel matrix by the IMF for singular value decomposition, then de-noise and reconstruction one IMF on the basis of the theory of singular value difference spectrum, and use the reconstructed IMF’s energy which include fault information as the income of RBF. This method can judge the kinds of diesel engine’s working condition and fault types accurately in the experiment.

The work process of medium-frequency power supply is complicated .Its waveform is complex and can not be measured conveniently. Therefore,This paper focuses on the analysis of operating principles and control methods of medium-frequency power supply, to determine its basic structural units.A simulation model of medium-frequency power supply which is controlled by pulse width modulation (PWM) is built with the electromagnetic transient analysis software PSCAD. The simulation and analysis of the medium-frequency power supply circuit are performed on the basis of the model.The simulation waveform can reflect the working process of medium-frequency power supply accurately. So this paper will provide a reliable basis for further research of medium-frequency furnace.

High voltage circuit breaker's motion parameters of the moving contact is one of the key performance indicators in the evaluated of breaker. By means of extracting color features of LW10B-252 circuit breaker by image segmentation, then determining its center point of the minimum circumscribed rectangle, getting the movement distance of center point and the use of time in adjacent images, realization motion parameter's measurement of the moving contact. This paper presents a algorithm based on improved k-means clustering algorithm to extract the color characteristics of the mechanical linkage of breaker, at the same time contrast with classical OTSU method and RGB color segmentation method. Experimental results show that the k-means clustering algorithm have a better segmentation result.

The site selection optimization for thermal power plant will directly impact the economic operation and sustainable development. On the basis of constructing index system for site selection of thermal power plant, the method of rough set is applied to obtain the index weights, which are determined only by the system potential information. Through the method of expert decision-making, the quantitative and qualitative information is integrated, and the priority of the alternatives is obtained. The multi-objective model for site selection optimization is built up to balance the economical efficiency and the average comprehensive efficiency. In consideration of decision-makers predilection and heat load demand, the two goals of cost minimum and average comprehensive efficiency maximum are achieved at the same time. Case analysis indicates that the method for site selection optimization of thermal power plant proposed in this paper possesses some advantages, such as scientificity and practicability.

In order to improve the diagnosis method of the existing high-voltage circuit breaker fault, demonstrated a new diagnosis methord of mechanical failure of high voltage circuit breaker based on vibration signal. According to the factors of high voltage circuit breaker failure and the features of Single-hidden Layer Feedforward Neural Network, SLFN, a method of high voltage circuit breaker fault diagnosis proposed based on Extreme Learning Machine (ELM). Finally, the experiment proves the effectiveness of this method for breaker fault diagnosis based on vibration signal analysis and ELM.

Based on the simulation of the air conditioning construction dynamic load and simulation calculation of air-source gas engine-driven heat pump (GEHP), the air-source GEHP air conditioning in winter, summer and the annual primary energy ratio are analyzed in simulation with the combination of a hotel building in Tianjin. Firstly, DeST software is used to simulate all-year hourly air conditioning load of the building. Then air-source GEHP simulation model [1] is used to calculate the annual hourly gas consumption and the amount of GEHP's gas consumption in winter, summer and a total year afterwards can be got. At the same time, by the analysis of waste heat recovery of gas engine-driven, primary energy ratio for air-source GEHP in Tianjin is given under the different waste heat recovery of winter, summer and the annual.

This paper introduces a transformer automatic test system based on virtual instrument (LabVIEW) and PCI hardware platform, and being Improved separately from hardware and software section. use remote control functions to achieve relay testing automatic commutation function and remote automatic control; Increase the voltage and the current automatic locking feature in the empty / load test, and not only improve the security and accuracy of the test system, but also greatly improve the automation of the test system.

As the urban subway leapfrogs in recent years, there are abound with close-spaced construction of metro tunnels. With the development of computer and software technology, virtual instrument will be widely developed in the testing field. The essay focuses on the usage of virtual instrument to develop a set of LabVIEW-based multi-sensor automatic monitoring system for the construction and protection of the adjacent metro tunnels. And with the comprehensive analysis of the monitoring data, the system can forecast the potential danger in a project. This monitoring system provides guidance for the adjacent construction and provides similar projects for reference.

The needs of large-capacity storage in high-speed image acquisition systems require the design of reliable and efficient storage instruments. The paper presents a FPGA-based high-speed storage instrument for high speed Camera Link image acquisition system. The FPGA processes the input data and stores the results into the storage array. Multi-chip large-capacity SLC NAND Flash chips constitute a storage array, with up to 100MByte/s storage rate, is used for the digitization image signals. A multilevel high-speed buffer structure based on abundant internal block RAM resources in FPGA is used for speeding up data access. At the same time, it can take advantage of FPGA constructing the corresponding VGA timing signals to control the video conversion chip ADV7123 to realize the function of real-time display. After a description of the proposed hardware and solutions, an experimental was built to test the performance. The results have shown that the FPGA-based acquisition system is a compact and flexible solution for high-speed image acquisition applications.

Due to the absence of the functional group in the poly (p-xylylene) (PPX) based tube, there is limitation of its application such as a catalyst supporter. In this paper a functional tube with a modification of the PPX tube by coating with polyacrylonitrile (PAN) was successfully prepared and its dielectric constant was measured. The results show that the PAN coated PPX tube has an obvious dielectric relaxations, which has no great different with that of a pure PAN film.

Plastic deformation resistance is a basic parameter of mechanics parameters in press work theory and technology. In this paper, the influencing factors of deformation resistance are analyzed and the model of deformation resistance is established. The deformation resistance can be calculated by program with Lagrange interpolation method. This result provides evidence for calculating mechanics parameters and designing metalworking equipment.

The main objective to study shift buffer impact of shifting process of construction machinery.introduces the working principle of main valve and wet multi-clutch,and developing a mathematical model and AMESim simulation model. analyzes the characteristics of pressure changes during the shift, buffering characteristics and impact on the performance characteristics, and experimental verification. The results showed that: the shift hydraulic system simulation model accurately credible; good performance of the system can effectively reduce shift jerk.

Aiming to meet the demand for real-time monitoring and adjustment in modern tailings management process, and solving the problems the development of technological innovations bring about ,this paper comes up with the establishment of this system for tailings based on LabVIEW. Utilizing the LabVIEW software platform, the ACCESS database and SQL language development technology, the paper is able to design various functional modules to optimize monitoring accuracy, data processing efficiency, and costs. The system can play a pivotal role in acquiring real-time change of the indicators, updating and sharing of the relevant data, which can finally assure the operation of tailings.

The management of old goaf is always the emphasis and difficulty in our mining industry. And the filling method is a important means for managing the old goaf. Taking a certain old goaf in ZiBo as an example, the article in detail introduced the process of old goaf management, proposed methods of regulating the quality of filling materials, constructing a new downhole water filter wall and controlling concentration of solution value in 53% to 55%, to strengthen the quality of concentration of solution. Based on this, the strength of filling body is 0.6Mpa more than the designed requirement, which can bring the good experience for similar researches.

Taking the mining subsidence as research object, a real-time monitoring scheme was designed. On this basis, a virtual instrument monitoring system based on LabVIEW was constructed. The data acquisition instrument collect real-time data through monitoring of subsidence and subsidence slope deformation by this system in range of mining influence, then control and transform it. After this, the data was transmitted to the computer terminal through wireless transmission equipment, and monitoring will be got after analysis and prediction by computer terminal. This result can provide mining of this area with real-time advice and guidance, to reduce the harms brought by mining subsidence and unnecessary economic losses.

Taking the ventilation system of Jinshandian Iron Mine as the background of this research, the author proposed and designed an automatic remote monitoring system of mine ventilation based on PLC and LabView in the essay. As various sensors and PLC are set in the mine, the system is able to achieve real-time monitoring and display towards the working state and working environment parameters for the fans and motors in the mine. With intelligent analytical technologies, the system will optimally regulate the start-up and shut-down or running frequency of all fans according to the change of personnel, equipment and working environment parameters, and play a role in dynamic display, early warning and remote control for the mine ventilation system. Practice has proved that the application of the system in the production of Jinshandian Iron Mine has successfully protected the staff and equipment, realized the remote central monitoring and controlling for the production, improved the automatic management for mining enterprises, and reduced the cost for ventilation.

This paper approaches the rules of curvature mode and curvature mode difference about a simply supported beam. On the basis of the theory of curvature mode, through numerical simulation analysis of simply supported beam on four conditions, the result of simply supported beam with curvature mode and curvature mode difference were obtained. The results show that for the damaged beam information with numerical simulation, the curvature mode and curvature mode difference index calculated by difference method at the unit length unevenly is with strong noise, which can even submerge the beam damage information, and for different damage index of the beam, damage information from curvature mode difference curve is stronger and effected by unit length weaker than those from curvature mode curve, and damage information from curvature mode curve and curvature mode difference curve decrease with the increasing mode order.

Large Eddy Simulation (LES) based on the least square meshless method was proposed in the present paper to simulate the classical turbulent flow around a stationary 2D circular cylinder. The subgrid scale model of Smagorinsky-Lily was employed to close the Navier-Stokes equations filtered by Favre filter. The Reynolds number is 3900 which means that the flow is subcritical and the wake is fully turbulent but the cylinder boundary is still laminar. Results obtained in this paper were evaluated by comparison with published experimental results and other numerical results. The results obtained in the present work show better agreement with the experimental values than other two-dimensional LES results .

The development of computers wireless network monitoring system mainly includes steps such as the selection of transmission protocol, the calls of database program, data display and automation implementation and so on. The transmission speed of protocol TD-SCDMA is faster. In addition, it also can transmit voice and pure data files. Thus, this article selects TD-SCDMA protocol as transport protocol of wireless sensor networks. On the basis of the software OLEDB, this paper has developed ActiveX Data Object program, and has implemented the safety supervision automation process of wireless sensor network technology. Finally, this paper uses VC++ software to make a numerical simulation experiment on computer programs by taking an example of coal mine gas monitoring. At the same time, through the display on the window, it is the gas concentration monitoring curve that is obtained when the mine safety is abnormal, which provides the safeguard for mine personnel safety and normal work.

Using modal analysis to train and bridges and piers for dynamics analysis, we got a theoretical solution. Using wireless sensor network architecture monitoring system for Bridges and piers of the acceleration and the settlement monitoring, in considering static load loading situation, through contrast train before and after the settlement of piers the quantity change and Bridges and piers acceleration size, draw piers vertical stiffness of the bridge vibration impact is not significant. Study of the bridge piers and transverse vibration characteristics, it is concluded that the piers lateral stiffness is far less than that of the vertical stiffness, piers and bridges in transverse have larger dynamic response to produce.

Curved girder bridge can adapt to the complex needs of road, so it applies more and more. Because prestressed curved girder bridge is spatial structure, its deformation under load, prestress etc is very complicated. If ill-considered, it will cause accidents as cracking of beam body, too large transverse displacement and bearing disengaging etc. In this paper, by analysis of engineering examples, using ANSYS finite element analysis software modeling and calculating, we get the deformation law of small and medium span curved girder bridge under deadweight and prestress, and the law has guiding significance and practical value on design.

This paper takes Nanhu project of Tangshan City under the soil condition of foundation pit excavation as an example. A model is established to research on the mechanical behavior effect of around composite foundation of CFG under soil lateral displacement by using ANSYS finite element software. The model analyzes the distribution law of horizontal displacement, stress of pile, soil between piles of CFG composite foundation under soil lateral displacement. Put forward a calculation formula of pile displacement by considering excavation depth, excavation distance.

This paper presents an automatic inspection robot for insulators installed on 500kV power transmission lines. In order to detect the poor insulators automatically, the robot’s behaviors are analyzed, and a behavior control model based on Finite State Machine (FSM) is established. Moreover, an exception handling method is proposed based on sensors and timers. The results of experiments in the laboratory prove that the control methods mentioned above are correct and valid. Experiments on a 500kV transmission live line show that the inspection robot can not only automatically move along the double insulator strings with variable intervals, but also reliably handle the abnormal conditions including slipping, power shortage, deadlocking, sensor abnormity, and probe loosening.

In order to investigate the calculation ability of meshless method and calculation precision for lift and drag force coefficient based on N-S equations with S-A turbulence model and Euler equations, numerical simulation of flow field around the DLR-F4 wing-body, supplied by the AIAA Drag Prediction Workshop, is employed using meshless method. Furthermore, the calculated results are compared with experiment results and Waller’s simulation results achieved by MGAERO software. It’s found that the present simulation results without consideration of fluid viscosity don’t agree well with Waller’s and experimental results. The present simulation results with consideration of fluid viscosity were found to be in good agreement with experimental results. These results indicate that meshless method coupled with S-A turbulence model could predict the natural flow characteristic around the DLR-F4 wing-body configuration well.

Environmental vibration problem caused by rail transport is always a crucial problem for the development of rail transport harmoniously and favorably. Lots of legislations have formulated to constrain this problem in many countries, however, most of them are worked out based on the analysis results and measured data from only single rail line. With the further development of rail transportation in China, more and more engineering will cross the others inevitably, which will cause a more complicated problem with multi-vibration source. And obviously, the multi-vibration source problem is not the linear superposition of several single vibration source problems. Focusing on two being planned overlapping shield tunnels, the computation model is established and the environmental vibration is calculated and analyzed by considering the running mode and running number of subway train. Fitting analysis is conducted and empirical formulas for vibration attenuation and then, the vibration range is determined accordingly. The research results in the paper can provide guide for the pre-design of overlapping engineering and also can offer references for the completion of relative legislations.

For measuring the high-g impaction and overload of some conditions, a kind of high-g accelerometer was designed. Testing and analysis to the accelerometer was processed through launching projectile to penetrate concrete target. Four fixed end structure was adopted in the design of the high-g accelerometer and the chamfer was set in the bottom and top part of the beam to divert stress. It is learned that the sensitivity of the accelerometer is 0.1uv/g by calibration. A kind of deceleration measurement device was provided to test the performance of the accelerometer through penetration experiment over concrete target and the design of the measurement device and penetration experiment over concrete target was illustrated. The impaction characteristic of the accelerometer was tested and studied through penetration to the target. MATLAB software is used to analyze the influence of the filter cutoff frequency over the test result and the best cutoff frequency point was set at 6 kHz, under which the maximum penetration acceleration is up to 28526 g.

Tianjin biomass energy utilization situation is surveyed and the result shows there have five kinds of use pattern in Tianjin biomass energy utilization: household biogas, livestock and poultry farm biogas project, straw biogas project for centralized supply, straw gasification for centralized supply, and biomass thermal utilization. Then the using scale, advantages and problems of these five kinds of use pattern are described. Finally, this paper analyzes the biomass energy utilization strategy in Tianjin, respectively from the perspective of biomass project construction and management, energy comprehensive utilization, new countryside planning and construction.

Using FLCA3Dnumerical simulation software, analyzed the different models of different extraction from the composite key layer of breaking the law, respectively to the Composite Key Stratum and non-Composite Key Stratum .The results show that Composite Key Stratum breaking interval was significantly greater than The non-Composite Key Stratum, showing a more obvious composite effect, provides a more adequate proof to the Composite Key Stratum theory.

Room-and-pillar mining method plays a dominant role in gypsum mines, which owns a low resource recovery ratio and has left many gobs leading a series of safety production problems to mining enterprises. To get an utmost resource recovery and avoid gob collapse, a secondary utilization scheme has been made by feasibility analysis and theoretical calculation. In this scheme, theoretical calculation about the occurrence conditions of mining damage has been done, and the deep research direction of the mining damage mechanism in gob-effect gypsum mines has been pointed out. This research and its train of thought could provide the gob-effect gypsum mines with reference that would increase ore recovery ratio and prevent mining damage.

For the multi-channel data acquisition system, crosstalk significantly affects the sample accuracy. Through analyzing the mode of multiplexer and the sampling timing sequence, we demonstrated that crosstalk effect mainly results from the switch of multiplexer for the low- frequency multi-channel data acquisition system. A new crosstalk testing method based on phase-shift rectangular waveform for the multi-channel data acquisition system was proposed. The phase-shift rectangular waveform was designed. Experiments were conducted to test crosstalk effect of the multi-channel data acquisition system. The experimental results were demonstrated that the proposed approach based on the phase-shift rectangular waveform exhibits a distinct feature in effective channel crosstalk testing, compared with waveforms of other types. Thus, the proposed method is effective to detect crosstalk of the multi-channel data acquisition system.

Turbocharger is an effective technique to achieve higher thermal efficiency reduced emissions. And hybrid turbocharger is proven to be a promising technique to eliminate the well-known 'turbo-lag' effect of the turbocharger. In this paper, a global optimization of hybrid turbocharger technique with variable geometry turbine and exhaust gas recirculation was carried out. The diesel engine was modeled by GT-SUITE software, which is a 1D simulation environment. Moreover, a dynamic programming based optimizer, which was developed in Simulink, was integrated with the diesel engine model. Simulations results show that the optimized parameters can improve the engine fuel economy significantly under Chinese typical urban driving cycle.

Shock and vibration response is a particularly important signal to characterize the system state. This paper analyzes the reason of fault generated high speed machine, vibration response mechanism and its frequency characteristic. According to the measured vibration signals, done time and frequency domain features analysis, wavelet packet analysis and frequency domain energy analysis, put forward a kind of fault comprehensive diagnosis method with accurate and rapid identification characteristics, can adapt to the complex vibration response signal with interference and low signal to noise ratio.

Based on the theory of ANN (Artificial Neural Network),The paper raised the method of construction control, and introduced the common forecasting method. According to the characteristic of ANN itself and the complexity of factors which influence the elevation, the paper analysed the influence aspects of ANN. On the promise of bridge construction precision, the paper raised section measure、elasticity model、temperature、delay of construction and cantilever for neural network’s input vector in bridge construction process. With the help of Graphical User Interface, built ANN, made the forecast function in the bridge construction into reality. Introduce the theory of Artificial Neural Network(ANN) into long span prestressed concrete continuous rigid-frame bridge construction control.

A new topology of shunt active power filter with two-leg three-level clamped capacitor in the main circuit is presented, and the operation principle and control scheme are introduced. The adopted device is operated as a controllable current source to eliminate current harmonics. The new hysteretic current comparison control scheme is used to track the command current and to balance the neutral-point voltage. Meanwhile the redundant operating states in the adopted inverter can be selected to compensate the clamped capacitor voltage to achieve the dynamic balance of the capacity voltage. Simulation results show that the shunt active power filter can effectively eliminate harmonics of the nonlinear loads.

The effect of bed depth on adsorption ability of natural zeolite to removal methylene blue (MB) from aqueous solution in the fixed-bed column was studied. The results showed that the increase in column height favored the MB removal form solution. The equilibrium uptake of MB onto unit mass zeolite increased with the bed depth growth. The experimental data were fitted to Yan model using linear and nonlinear regression analysis, respectively. The experimental points and the predicted curves using the Yan model were compared and the error analysis was performed. The results indicated that Yan model were good to predict the breakthrough curves and both two methods can be used to obtain the parameters of Yan model and to predict the breakthrough curves.

According to the current national conditions and the intelligent communities’ requirements on the electric energy metering system based on the broadband power line communication (PLC), this paper introduces a design program for achieving the remote meter reading through the broadband PLC technology. The system takes the high-performance single chip microcomputer and the Ethernet controller RTL8019AS as the core, the low-voltage power line as the medium of data communication, and makes the electronic meters access to the Ethernet via the broadband power line, thereby achieving the remote automatic meter reading. The multi-functional low-voltage power line remote meter reading system constituted by this system and the backstage management system together will have broad application prospects. In addition, this paper also makes a preliminary study on the reliability of the meter reading system.

We have used Groundwater Modeling System (GMS) to numerical simulate the groundwater pollution migration caused by crude oil leak in the research regions. The result of the numerical simulation shows those 40 years after the crude oil leak, the contaminative area of pollutant reaches 46595 m3, and then the pollutant doesn’t arrive the pumping well. The density of the pollutants is less than 0.01mg/L. Therefore, we suggest that pipeline projects should make a specific effective plan for groundwater environmental monitoring for the sake of providing reference to institute relative countermeasure for prevention and control groundwater pollution.