Advanced Materials Research Vols. 299-300

Abstract: Based on ANSYS finite element analysis software for the platform the hoister spindle device overall assembly analysis were accomplished by the finite element theory and method. The overall stress and strain of convective cloud were achieved in the paper, which is the foundation for further overall structure optimization design and assembly analysis research. Meanwhile topological optimization analysis for the board of the picture of drum was gotten and humanoid pore model board was given, which provided a strong theoretical basis for the mine hoist spindle device optimization design.

Abstract: The development of novel nontoxic antifouling paint has led to the need for better test methods to evaluate their performance. The adhesion strength of microorganism on material surface is the key parameter to characterize whether they could permanently soiled, therefore it is significant to establish a biological adhesion test method to evaluate the material antifouling ability. In this paper, several types of surface adhesion strength test devices have been introduced, including spinet apparatus, laminar channel flow cell, radial flow chamber, annular flow cell and fully-developed turbulent channel. Their application, advantage and disadvantage have also been discussed.

Abstract: Oval bevel gear is a kind of noncircular bevel gear which can achieve variable transmission between intersecting axes. We design the pitch curve by spherics cosine theorem in spatial polar coordinate because the pitch curve of oval bevel gear is not the planar curve. The bevel gear cutter is introduced, and we get the Three-dimensional model of oval bevel gear through extended development of UG. This method can make the calculation accurately, easily and get a wide variation of transmission ratio.

Abstract: In this paper, the characteristics and design rules of piston skirt middle-convex ellipse surface are studied, and the piston skirt profile mathematical model was established. Piston skirt middle-convex curve is interpolated based on MATLAB, and the piston middle-convex surface was generated according to the theory of surface modeling; the piston skirt transversal section was controlled based on Pro/E curvilinear equation, and then the piston skirt surface was created. The example indicates that commonality and fitting precision of these two design methods are excellent, so it has the better application value of project.

Abstract: High-speed sewing performance which determines the performance and quality is the core technology of the industrial high-speed sewing machine. Such studies for sewing performance which are the core technology and own the intellectual property in the enterprise have been researched in the developed country. And fewer articles can be seen in the public materials. In this paper, the quality and performance of the ZJ9700MF-RS have been greatly improved by the way of simulation and redesign for high-speed sewing machine.

Abstract: The models of resources and manufacturing processes, which aim at the production system of the resin dry transformers, are constructed by Object-oriented Petri Net (OPN) in this paper. SCB9 1000/10 400(Cu) transformer is taken as case study, the flow chart of manufacturing transformers are described at first, and then researched by static analysis, dynamic analysis and integrated application in details. The conflicts of the OPN models, which may happen in all manufacturing system of resin dry transfers, have been resolved. The whole manufacturing system are improved and optimized in the manufacture processes at last.

Abstract: In accordance with the geometrical parameters deduction process for the fully intermeshing twin screw, analysis and calculation of the section curve are performed. Then the geometrical parameters for section curve are defined based on theories of relative motion and gear meshing principal. Do research on the co-rotating parallel axis fully intermeshing twin screw from intermeshing principle, cross section curves, volume parameters, center distance and so on are deduced. The parameters can be used to provide references to design some twin screw devices.

Abstract: Due to strong heat accumulation and low surface tension of aluminum alloy, weld width will become wider, even subsidence in pulsed MIG welding process of aluminum alloy at constant parameters. A variable double-pulse method for weld width control is proposed. Weld width control is realized by changing double-pulse duty cycle that is the ratio of high-energy pulse time in a double-pulse cycle to adjust heat input based on the vision sensing for weld width. A rapid prototyping control system is built on the basis of vision sensing and xPC Target real-time environment. Then variable double-pulse MIG welding process test is done and proves the feasibility of the control scheme. On this basis, weld width control test in pulsed MIG welding of aluminum alloy is carried out and obtains a good weld with beautiful formation and uniform weld width. The results show that weld width control can be realized well with the variable double-pulse method in pulsed MIG welding of aluminum alloy.

Abstract: Stress intensity factor is one of the most important parameters in fracture mechanics. Based on the principle of virtual work and bending theory, this paper proposes a method to estimate the stress intensity factor for circumferential cracked elliptical pipes and derive the expression of the stress intensity factor for circumferential cracked elliptical pipes under tension. The compare of the result of this method and finite element method shows this method is credible and convenient.

Abstract: In the work environment, the structure of aircraft’s hydraulic pipes and the fluid inside constitute a typical fluid-structure interaction (FSI) system, in which there are transfers of momentum and forces between the pipes and fluid. Excitation caused by high frequency pulsation of flow and pressure may lead to fatigue damage of the structure. In order to help the designers estimate the dynamic response of the aircraft’s hydraulic pipes, the FSI of aircraft’s hydraulic pipes is investigated in this paper. Using ANSYS CFX and ANSYS Mechanical as the tools, a finite element analysis was done to compute the stresses and strains of the fluid-filled pipes caused by high-pressure pulsation. Furthermore, the fatigue analysis was done to evaluate the safety of the structure.