Applied Mechanics and Materials Vol. 367

Abstract: The paper presents a methodology to obtain the stress solution of a simply supported beam subjected to arbitrary load with the help of, elasticity based, Fourier series approach. The applied load spectrum is converted into Fourier series with constant, sine and cosine components for which the solutions are available. The individual solutions are superimposed to obtain the final result. Deviations are noticed on comparing the results with those obtained from the conventional strength of material approach.

Abstract: This paper describes the modeling of multiaxial ultimate elastic wall stress (UEWS) at room temperature for glass fibre reinforced epoxy (GRE) composite pipes. The model developed, predicts the stress-strain response caused by the combined, static and cyclic of UEWS loading taking into effects of transverse matrix cracking within the laminates. The procedure, although not a standard method, seems to provide a good alternative to the current raw materials' re-qualification procedure delineated in ISO 14692 through ASTM D2992. The effective transverse and shear modulus of the lamina due to increasing presence of transverse matrix cracking were estimated. Classical laminate analysis was then applied to compute the corresponding ply properties as a function of increasing stress and strain. The model shows a good agreement with the experimental results of multiaxial UEWS tests on ±55° filament wound glass-reinforced epoxy pipes.

Abstract: The dynamic property of vehicle frame directly affects the safety and comfort of whole vehicles. In order to fully understand the dynamic properties of vehicle frame, both finite element beam and shell models for vehicle frame are established and the natural frequencies of vehicle frame in free working conditions are obtained. The results from beam model and shell model have high accuracy. Those results can be helpful for improvement and optimization of the vehicle frames.

Abstract: As one of the most important load-bearing parts, coupler knuckle has a direct relationship with the safety in operation and reliability of the freight trains. A new forged coupler knuckle is made in order to meet the challenge to export ore train to Australia. Using the finite element technique, the stress characteristics of forged coupler knuckle under 1225kN load in tension and 1500kN compression load are evaluated. Simplify the load and boundary condition depend on the real working situation, the numerical simulation results coincide with experimental data.

Abstract: Two-dimensional incompressible, viscous fluid flow around a rotationally oscillating circular cylinder is studied numerically by using a recently developed higher order compact finite difference scheme (HOC) at Reynolds number Re = 500. The stream function vorticity formulation of Navier Stokes equations in cylindrical polar coordinates are considered as the governing equations. Different values of peak rotation rate α_m and forced oscillation frequency f_e are considered. The simulated results are in a good agreement both qualitatively and quantitatively with the previously published results.

Abstract: A novel RV-planet gear drive with small teeth difference used in wind turbine is developed according to theory of mechanisms and gear mesh, and a national invention patent is granted. The composing elements, kinematic relationship and transmission ratio of RV-planet drive with small teeth difference are analyzed. 3-D virtual drive has been designed and all kinds of interferences have been checked with the software Pro/Engineer. Kinematic simulation of the drive is made with dynamic software ADAM and the transmission ratios and rotation speeds are validated. So a solid foundation to trial-manufacturing the drive is layed.

Abstract: Via combining parameterized modeling function of Pro/E with gear mesh principle, the accurate 3-D crowning modification models of involute gears used in automobile are made. The edge effect in meshing process of the gear pair is validated by finite element method. The longitudinal corrections of a gear pair are designed combining crowning technology of roller bearings with the characteristic of gear mesh and using gear mesh principle and contact mechanics theory. Then it is testified by FEA that the maximum stresses of the gears can be reduced effectively since longitudinal correction can avoid the edge effect in the meshing process of the gear pair.

Abstract: The loading roller number and maximum stress of the bearings can not be calculated accurately through conventional methods because support manner of the roller bearings used in rolling mill is different from that of the roller bearings used in conventional condition. Based on characteristic of the bearings, the model of the bearing is made combining contact mechanics with finite element method. The loading roller number and maximum stress of the bearings are calculated through FEA. The work of this paper offers a reference to design and manufacture this kind of bearings.

Abstract: To complete the optimization of large-scale structure such as vehicle body efficiently, a new topology optimization method which combines with sub-structural analysis technology is proposed. With HyperWorks/Optistruct for a platform: first, the finite element model of the light rail vehicle body including sub-structure and non sub-structure is created; second, analyze the most dangerous condition using static reduction method which based on sub-structure technology, output the reduction matrix, generate the sub-structure; and then optimization model is defined including that design variables is the element density, objective function is the minimum volume fraction and constraint is the definition of stress, then enter the reduction matrix, and choose the non sub-structure area for topology optimization; Finally, based on the results, redesign the structure and get the improved one according to the technical requirements and practical experience.

Abstract: According to the problems existing in the serial mode design method ,green design for concurrent engineering is introduced in developing agriculture machinery product to shorten the product developing period ,reduce cost ,reduce pollution ,improve quality preserve environment ,and improve the green degree of agriculture machinery product .The main contents ,design mode and basic characteristics of green design are elaborated in this paper for concurrent engineering .At the same time ,type green design system is also introduced in the pape. Green design for concurrent engineering is a new product exploitation and designmode. As green design for concurrent engineering for agriculture machinery product is demand of the product development, it promotes sustaining progress for agriculture system.