Advanced Materials Research Vols. 753-755

Abstract: The article mainly studies the micro electric vehicles shock absorbing coil spring. For its actual working conditions, the finite element analysis software ANSYS is used to analyze the nonlinear of the spring. The large deformation and the contact between flexible surface and flexible surface should be considered in the nonlinear analysis. And we get the spring stress, displacement etc. Then the results are reprocessed. For the shock absorbing coil spring used in the micro electric vehicles, there are no improved research methods and theoretical support, this study provides the basis for optimization design and selection of the shock absorbing coil spring.

Abstract: The tower is the main supporting structure of wind turbine, is connected with the foundation and bears the long-term effects of wind load and gravity load and so on. The structural styles of wind turbine tower are analyzed. The lowest height of tower is presented and the relationship of the tower height and diameter of the wind wheel is also studied in detail in this paper. By analyzing the natural frequency and the vibration displacement of wind turbine tower system, the reasonable resonance vibration interval of tower system is also obtained.

Abstract: This paper studies experimental methods to measure friction, which determines the wear of chain elements in relative motion from a chain transmission, used in camshaft drives for an internal combustion engine. The paper presents a critical analysis of a constructive solution realized to determine the friction torque in parallel axes transmission bearings.

Abstract: Shallow spherical shell is an important kind of sensor elastic element. Because of the particular metal material texture, it can work under high temperature field. The nonlinear buckling problems of shallow spherical shell in load and temperature filed are very important. In this paper, nonlinear buckling of shallow spherical shell under uniform pressure and temperature field in simply supported boundary conditions is studied by the modified iteration method, and the analytic formulas for determining the critical buckling load are obtained. The effect of temperature field on critical buckling load and critical geometrical parameter are discussed.

Abstract: It is a challenging problem for scientists and engineers to calculate the random vibration responses of a large scale engineering structure, during which, the calculating efficiency and accuracy are always the main concerns. In civil engineering, there are some even more difficult cases that have to be considered, such as a large span cable-stayed bridge under multi-dimensional seismic loads consisting of evolutionary random processes. In this paper, such a problem is analyzed by using equivalent excitation method, in which the equivalent excitations are constructed by using continuous wavelet transform, and the affections of multi-dimensional seismic excitations are investigated. Simulations of a typical cable-stayed bridge show some of the plausible features of the method presented.

Abstract: Aim at the problem of machining integral impeller, a method of using finite element theory to carry out the statics analysis of impeller in this paper is studied. The finite element model is established, and then the nephogram of the impeller stress, strain and total deformation are obtained. The result is attained: in the case of impeller rotation and statics load, the maximum of stress and strain occur at the root of suction surface, the maximum of total deformation occurs on the blade tip position of suction surface, while the maximum deformation position has not changed, which increases with the increasing of rotation and statics load. The data results provide a theoretical reference for the machining of integral impeller.

Abstract: Against the application of spatial structure field, a configuration design about hexagonal radial deployable structures is presented, and illustrates its working principle. According to the characteristics of its motion, the moving space of the structure is analyzed; the mechanical property of the deployable mast is fully analyzed. The stretch and shrink of the deployable mast is simulated by ADAMS, and modal of hinge joint is analyzed by Partran . Results show that the new type of radial deployable structures is reasonable and reliable to promote.

Abstract: In order to understand its performance before seal ring putting into use, the paper selects the commonly used polyurethane Y-sealing ring, establishes a model of Y-ring using finite element analysis software and simulates the work environment of seal ring. The deformation and stress of Y-ring under various working pressure can be obtained to summary the deformation and stress rules, as well as the possible crack positions of Y-ring.

Abstract: In order to obtain the optimal value of the shape of harvester recovery knife, this paper mainly using the Matlab to fit the wave curve of the recovery knife Based on Matlab recovery knife. Through the initial theory knife piecewise to fit out the function and achieve a optimization and the optimization results accurate the each parameter value and the result is near the initial theory knife which comply with the design purpose.

Abstract: It is indicated by many earthquake damage surveys that the seismic design of underground structures is a key issue for underground caverns. However, methods regarding seismic design of underground caverns have not been covered by current national codes. The wave field stress method is a kind of method in which the additional stress induced by earthquake is calculated based on the dynamic features of structures. Based on the earthquake damage survey of the underground cavern at Yingxiuwan hydropower plant after Wenchuan earthquake, the wave field method is used to analyze the structural response under earthquake impact. After comparing calcluation results to field findings, it is discovered that they are basically in good agreement. Therefore, it is concluded that the wave filed stress method can be adopted to assist the seismic design of underground structures during the preliminary design phase of project.