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Researching and analyzing the static characteristic of the hook that functions at the limited load has an important meaning to design larger tonnage hook correctly. Academic analysis structure-strength is implemented on the hook of drillwell DG450. Firstly, based on the characteristic modeling technology, the 3-D entity model of the hook is built used Pro/E. Secondly, the static analysis on three dangerous work condition at ultimate load of the hook is proceeded by FEM software Ansys. The stress and displacement are gained to specify the stress status at the different work condition of the hook. And find out the most dangerous place where the stress is the largest. Important academic elements and data for study and design are provided. Which supplies the clear direction for the improvement of the weak structure-strength. [ABSTRACT FROM AUTHOR]

Optimal design of beams subject to a combination of uncertain and deterministic transverse loads is presented using a min-max approach. The compliance of the beam is maximized to compute the worst case loading and minimized to determine the optimal cross-sectional shape. The uncertain component of the transverse load acting on the beam is not known a priori resulting in load uncertainty subject only to the constraint that its norm is finite. The min-max approach leads to robust optimal designs which are not susceptible to unexpected load variations as it occurs under operational conditions. The optimality conditions in the form of coupled differential equations are derived with respect to load and the shape functions. The resulting equations are solved analytically and the results are given for several cases to illustrate the method and to study the behavior of the optimal shapes and the worst case loadings. The efficiency of the optimal designs is computed with respect to a uniform beam under worst case loading taking the maximum deflection as the quantity for comparison. [ABSTRACT FROM AUTHOR]

The paper describes a vehicle steering knuckle undergoing time-varying loadings during its service life. Fatigue behavior is, therefore, a key consideration in its design and performance evaluation. This paper is aimed to assess fatigue life and compare fatigue performance of steering knuckles made from three materials of different manufacturing processes. These include forged steel, cast aluminum, and cast iron knuckles. In light of the high volume of forged steel vehicle components, the forging process was considered as base for investigation. Static as well as baseline cyclic deformation and fatigue properties were obtained and compared. The paper envisages that in addition, referring a number of load-controlled fatigue component tests conducted for the forged steel and cast aluminum knuckles. Finite element models of the steering knuckles were also analyzed to obtain stress distributions in each component. Based on the results of component testing and finite element analysis, fatigue behaviors of the three materials and manufacturing processes are then compared. The paper concludes with that forged steel knuckle exhibits superior fatigue behavior, compared to the cast iron and cast aluminum knuckles. [ABSTRACT FROM AUTHOR]

Chapter 11 of the book "2009 National Earthwork & Heavy Equipment Estimator" is presented. It focuses on the components of pier estimating. It cites the grade beam and drilled pier foundation as a common design in areas where the surface soil's load-bearing capacity is insufficient for the expected design load. It highlights pier subgrade elevation and the calculation of pier-drilling volumes. It also discusses about bell reaming, which is priced by the cubic foot of excavated soil.

In this paper, we employ the Fourier series to design the pitch curve of noncircular gears with function generation. With the speed ratio is represented as Fourier series, the nonlinear function of angular displacements can be acquired through integration. And then, based on known finite separated angular displacements of two gears, the order of Fourier series is decided and a set of simultaneous equation is obtained. By solving the simultaneous equations, the Fourier series function regarding angular displacement and speed ratio can be obtained. Finally, synthesizing these two formulas creates the pitch curves for the noncircular pinion and gear, respectively. In this research, we demonstrate two designs examples to interpret the design process of the pitch curves of noncircular gears. In addition, the results derived from this paper can be taken as a reference to design the pitch curves of noncircular gears with function generation. [ABSTRACT FROM AUTHOR]

Chapter 4 of the book "Casing and Liners for Drilling and Completion," by Ted G. Byrom is presented. It discusses several types of casings and casing loads as well as differentiates collapse and burst loading. Suggestions for designing these types of casings and determining casing loads are also provided.

Chapter 5 of the book "Casing and Liners for Drilling and Completion," by Ted G. Byrom is presented. It focuses on the development of design loads and casing selection. The author discusses casing selection for axial, collapse and burst loads. Considerations for these two procedures are also explained.