Advanced Materials Research Vols. 889-890

Abstract: A certain FOFAS (framework of feeding ammunition system) has extremely important function such as fixing, supporting and leading orientation, etc. Optimization design for FOFAS is the focal point under meeting such criterions as stiffness, strength and safety. Using Workbench, this article mainly carried out parametric design to optimize feeding ammunition box under Multi-objective Genetic Algorithm (MOGA). Pareto solutions from optimization simulation showed that minimum mass of ammunition box was decreased by 6.17%, displacement deformation had little influence on the FOFAS and equivalent stress was increased by 0.35%. The optimizing results satisfied the strength, stiffness and polynomial response requirements.

Abstract: The design of the gearbox must ensure the simplest structure and the lightest weight under the premise of meeting the reliability and life expectancy. According to the requirement of wind turbine, an improved method combined dynamic penalty function with pseudo-parallel genetic algorithm is used to optimize gearbox. It takes the minimum volumes as object functions. It is showed that the ability to search the global optimal solution of improved genetic algorithm and less number of iterations. The global optimal solution is worked out quickly. The size parameters are optimized, as much as the driving stability and efficiency. To verify the feasibility of improved genetic algorithm, ring gear of the gearbox is analyzed. Static strength analysis shows that the optimization method is reasonable and effective.

Abstract: The aim of this paper is to present the advantages and the vision of Reverse Design from virtual manufacturing. With the reverse design method, the real geometry after manufacturing process (by simulation) was predicted. In the first part of the study, comparisons were made between difference cases (the injection position and the amount of the pin gates). Based on the results from simulation, it is clear that 4 pin gates are better choice. In the second part, under the 4 pin gates working condition, considering the warp from the injection molding process, the actual minimum gap between the fan and the frame after assembly is smaller than the original designed gap. Therefore, to get the ideal product to keep the designed gap between the fan the frame, the radius of the fan should be reduced or the radius of the frame should be increased. While in other case, which was simulated with 3 pin gates, the real gap is larger than the original gap. Therefore, to get the ideal product, the radius of the fan should be increased or the radius of the frame should be reduced. In conclusion, original designed parameters could be modified, with the help of virtual manufacturing (by simulation) to make the assembly more accurately efficiently.

Abstract: In this paper, quadruple-arc gear tooth profile parameters are optimized further by finite element analysis software ANSYS, and acquired a group of optimized tooth profile parameters. Which can improve the quadruple-arc gear carrying capacity, and provide a theory for design and calculation of quadruple-arc gear.

Abstract: The 3D computer technology has a wide range of applications currently, with various engineering fields. All 3D visual effects can bring us visual impact, the use of 3D computer technology produced by advertising more easily accepted by the audience, this paper discuss the 3D computer-aided design advertising and its application. The paper analysis 3D advertising purposes and applications range scale, the application of technical features and style.

Abstract: In order to improve dynamic and static performance of the precision horizontal machining center, the method of multi-objective optimization based on the response surface model was applied for optimizing design of the bed structure. The design variables were the layout parameters of the rib plates. Sample points were obtained by the Box-Behnken design experiment, and responses of sample points were analyzed by SAMCEF. The maximum deformation of guide rails and the low-order natural frequency were extracted to fit the response surface model by least square method. The layout parameters of the rib plates were optimized through the application of multi-objective genetic algorithms. Then, relationship between the lightening holes and the performance were analyzed to determine the suitable diameter. The results verify the validity of the optimization method, and the paper provides methodological guidance for optimization of machine tool structural parts.

Abstract: The periodic structure is common used in engineering to improve the sound diffusion in room acoustics. It usually has large dimensions and it is difficult to calculate the scattering coefficient based on its original scale. In order to represent the scattering coefficients of a large scale periodic structure by those of a smaller one, the relations of the scattering coefficients of the periodic structures with different dimensions are analyzed in this paper. At first, a BMM (Boundary Meshless Method) for calculating the scattering coefficient is derived. The scattering coefficients of the periodic structures which have different numbers of sub-structures are calculated and compared. The computation results of different sub-structure numbers show that the periodic structure with 15 sub-structures can represent the samples which have more sub-structures. In addition, it can be proved that the square samples can be represented by those of the small and rectangular ones which have the same numbers of sub-periods. These conclusions not only greatly enhance the computational efficiency, but also show good prospect for fast evaluation of the periodic structures in engineering applications.

Abstract: Aanalyzed the finite element static characteristics of the slender shaft deformation under the influence of cutting forces with different clamping ways in turning process by Pro/ENGINEER and Pro/MECHANICA software . Also analyzed the influence of clamping ways on the natural frequency of the slender shaft modal characteristics. The result indicates that the static analysis can be applied to the prediction of processing deformation with different clamping ways, the modal analysis can be applied to the calculation of the slender shaft natural frequency with different clamping ways. Can get a basic for reducing machining deformation and vibration, selecting cutting parameters, drawing up technological scheme reasonably.

Abstract: The investigation of interface pressure between cable joint and cross-linked polyethylene (XLPE) power cable plays a key role in cable joint design. For ensuring the safety of electrical transmission, an adequate interfacial pressure should be maintained for the electrical stability. The pressure distribution along the interface distance of cable is derived by means of finite element method (FEM), and the relationship between the interference magnitude and the interfacial pressure was analyzed.

Abstract: Boom is one of key components of concrete pump trucks which can be looked as a projecting beam when unfolded at pumping mode. Under different concrete pumping modes, vibration of boom is serious for the hydraulic cylinder switching over shock, which can lead to the early damage of boom structure. In the finite element analysis software, boom of 37 meters concrete pump truck is simulated for its modal. Natural frequencies and corresponding modes are got and analyzed. To reduce vibration of concrete pump trucks, advices are presented by finite element modal analysis.