Applied Mechanics and Materials Vols. 633-634

Abstract: Fatigue failure of sucker rod can occur under the effect of alternating load, and results in failure of sucker rod. In this paper, the damage mechanics theory is applied to the fatigue damage of sucker rod on the study, establish the fatigue damage evolution equation of sucker rod, and the damage mechanics-finite element method is adopted to solve fatigue damage of sucker rod, obtain change law of stress field, strain field and fatigue damage field of sucker rod, and carry out fatigue damage cycles of sucker rod. The study has a certain theoretical significance and practical significance on the rational use of sucker rod, the decrease of sucker rod fracture accident and the improvement of overall economic benefits in oilfield development.

Abstract: Compared with the traditional metal square cabin, the new type square cabin makes a good performance on lightweight and can also improve the stiffness of the structure. Both the static and dynamic analysis results which tested under the condition of general standard show that: the new type cabin which made by aluminum foam sandwich composite panels can reach the purpose of light weight design and also can improve the stiffness of the structure. What is more, optimum design is used on the dimension parameter to enhance the property of the square cabin.

Abstract: Design and selection of hydraulic support is the core of coal mine fully mechanized mining equipment selection and matching, determine the hydraulic supporting strength Using the numerical simulation method and shallow buried depth of roof structure of theoretical calculation method, determines the necessary technical parameters such as the support frame, the bracket height and the bottom plate pressure According to the coal seam thickness and coal seam structure, which has the instructive meaning in application.

Abstract: Local buckling and accounting of the geometric nonlinearity of light steel thin-walled profiles is an important topic. The authors assesses the influence of geometric nonlinearity on the bearing capacity profile in transverse bending conditions.

Abstract: The article suggests an approach to determine structural elements technical condition, based on the mathematical probabilistic apparatus of technical diagnostics. Diagnostics are performed using probabilistic methods of complex technical systems conditions recognition. Probabilistic parameters are calculated according to Bayes’s rule. The paper shows a diagnostics example of intermediate floor elements and systems in the old urban development building. Both the suggested method and information theory methods are used during diagnostics.

Abstract: Aiming at the processing problem of electric bus leaf spring equivalent model, the amendment leaf spring equivalent processing model is proposed after 3 kind leaf spring equivalent models are studied. This paper makes a comparison between the amendment leaf spring equivalent model and other models. Results show that the amendment leaf spring equivalent model not only considers the longitudinal force and lateral force of the leaf spring, but also avoids emergence the high stress area. So the amendment leaf spring equivalent model is more conform to the actual force situation of the electric bus frame, and it can provide the reliable constraint conditions for the next electric bus lightweight.

Abstract: This paper makes qualitative analyses of solar air conditioning systems, demonstrates the feasibility and elaborates on the advantages of solar air conditioning development from the perspectives of environmental protection and energy conservation for the purpose of providing a theoretical basis for the future implementation of the solar air conditioning industry.

Abstract: In order to solve the problems of local stability of telescopic boom of truck crane in practical engineering, considering the initial geometric imperfection and the welding residual stress, the nonlinear local stability analysis of telescopic boom was studied by ANSYS software. APDL command flow was used for controlling the analytical process. Firstly, the foundational theories of the nonlinear finite element method were introduced. Secondly, the influence of the initial geometric imperfection and the welding residual stress on the nonlinear buckling of the boom was studied. Finally, the nonlinear buckling critical stress value of the curved cross section boom for an example was obtained, and it was used to compare with the rectangle, hexagon and dodecagon boom, consequently, a conclusion was drawn that the ability to resist bucking of curved cross section boom was stronger.

Abstract: The load spectrum, on which there is not a thorough research, is the key factor of the safe operation of EMU. A dynamic model of some high-speed EMU is established and the load time history of main load on frame is obtained through simulation and analysis based on the Beijing-Tianjin route. The load spectrum for main load is calculated by rain-flow counting, the crossing contrast of load spectrum in basic and fault conditions is proceeded as well, the extent of impact of all kinds of fault conditions to bogie main load is analyzed and a brief introduction of estimation method of the frame fatigue life is put forward in this paper.

Abstract: The vibration power flow characteristics of the fully simply supported laminate structure subjected to different excitation frequencies was discussed. Based on the layer-wise theory with finite element models, the effects of panel orientation angle, elastic modulus ratio and width-depth ratio on the power flow of the laminated composite plates were discussed, and the corresponding power flow - frequency streamlines were given. From present results, it can be demonstrated that the panel orientation angle and width-depth ratio have a greater impact on vibration power flow. Further, the information above can be used to control the noise level of the structural vibration.