Advances in Mechanical Design

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Authors: Yan Xia Wang, Hui Gao
Abstract: Based on the axially symmetric of piston head, the 2D parametric model of piston head is established using the ANSYS software. The optimized design program is written by APDL language and the optimization is carried out using the ANSYS software, which provides a better reference for reliability and life of engine.
Authors: Hui Jun Yin, Jian Jin, Ping Hui Yang, Yu Pan, Shu Kun Ma
Abstract: How to improve the collision process of safety performance has become one of the most important issue in the automobile manufacturing enterprises. This paper using LS-DYNA made a security analyses about former girders, based in half vehicle model, analyzing the security of the front side member to reflect the vehicle’s performance. At the same time, through the front side member’s assembly structure’s contrast with the modified ones, the result has proved the improvement is more effective.
Authors: Hui Jun Yin, Ping Hui Yang, Jian Jin, Yun Feng He, Yu Pan
Abstract: This paper used UG NX software to establish the whole modal of the machine, which invented by the company itself and mainly used to process the automotive panel mould. The automotive panel mould is made out of Styrofoam. And we have used the advanced simulation which belongs to the software (NX-Nastran) itself to establish the model’s dynamic analysis. In the end, we have got the first six’s characteristic frequency and mode shapes. It provided references for the researcher’s design and analysis about the design of the whole machine.
Authors: Jian Jun Meng, Jin Tian Yun
Abstract: The two-port network theory for describing the characteristics of the haptic interface is presented; the four-channel bilateral control architecture is introduced, and two control methods named position-error-based control and direct force reflection control (PEBC & DFRC) are also presented. Two main problems caused by the coupling between position and force information for transparency improvement of the haptic interface are also be discussed and a Model-Based Force-Position Compensation Strategy to enhance the transparency of the haptic interface is proposed. By embedding the compensation unit into the DFRC architecture, the Haptic Interface could be controlled with precise position and high-fidelity force feedback.
Authors: Bo Sun, Gang Chen, Xiao Ming Liu, Er Zhi Wang
Abstract: In this paper, the concept of robust optimization design for the breaking spring of spring actuator of vacuum circuit breaker is presented. The function, that is to minimize the error and maximal variations of spring stiffness coefficient related with structure parameters and its tolerances, is chosen as the objective function, and the acceptable region of the tolerances is formed by some constraints. The optimum parameters of the breaking spring are given by solving the nonlinear programming problem with multi-target and two-level optimization, and the optimization results are discussed.
Authors: Dian Xin Li, Hong Lin Zhao, Shi Min Zhang, Dai Geng, Xian Long Liu, Shan Jun Zheng
Abstract: The bridge plug is a staple tool used in downhole operation and the performance of the slips has a directly influence on the oil well productivity and production safety. We raised an optimize method based on BP network and genetic algorithm to make sure the slips satisfy the high temperature and high pressure demands. Establishing the slips system and making finite element analysis by ANSYS, abtaining sixteen group datas to constitute the BP network training samples, establishing the BP simulation model reflecting curvature radius of the slip fluke, dip angle of the fluke, angle of the fluke and distance between flukes using nonlinearity mapping ability of the neural network, applying optimize design for the simulation model using global optimization ability of the genetic algorithm and abtaining the optimum structure parameters of the slip. The optimized results indicate the whole performance of the slips system has increased notably.
Authors: Bu Suan Xu, Guan Sheng Ren
Abstract: When the test-bed tests semi-automatic coupler draft gear of the metro vehicle in the case of maximum lateral swinging angle, it requires a hydraulic motor to move the adjustable bearing base which is linked with coupler draft gear in a certain distance until it achieves the desired Angle. In this article, we adopt the valve-control motor electro-hydraulic position servo control system, in which it has the angular measuring device. Besides we optimize the effection of control system by using the fuzzy strategy. Through the AMEsim/Simulink co-simulation and analysis, the level swinging angle of coupler draft gear shows accurate, reliable and stable, which reaches the expected effection completely. With the more and more complex of the controlled object, this kind of intelligent control strategy gives an effective solution for solving complex problems.
Authors: Tong Yang, Jian You Han, Lai Rong Yin
Abstract: For spherical 4R linkage synthesis reaching four specified task positions, we introduce a simple derivation method of spherical Burmester curve equation by employing a displacement matrix method. Then we presented a method to calculate the coordinates of circle and center points, so the spherical Burmester curves can be drawn by the software developed.
Authors: Lai Rong Yin, Jian You Han, Tong Yang
Abstract: When a Burmester point coincides with the Ball point at the inflection circle pole, given a fixed joint and the point, which is on the expecting straight-line and direction can synthesize an infinite number of mechanisms with coupler curve having a five-point contacts with its tangent, namely, Burmester point. Any displacement is corresponding to three four-bar straight-line linkages with the synthesis formulations given. The property charts, which include the bar ratio, the sum of bars, the relative straight-line length, mechanism types, and so on, are drawn by developing a mechanism software based on vc++6.0 with the solution region method. So the users can find out the involved linkages information intuitively, and also the aimlessness in choosing optimal mechanisms is avoided effectively.
Authors: Li Gong, Yu Feng Ding, Bu Yun Sheng, Dong Dong Che
Abstract: Considering complex environment of disaster site, an Arm-swing Wheeled Robot (AWR) with auxiliary obstacle-surmounting mechanism was developed. The obstacle-surmounting process is simplified into three stages, and the mathematic model of kinematic for each stage has been established. The simulation for each stage of obstacle-surmounting has been carried out in MATLAB. The stability of obstacle-surmounting is analyzed and the trend of resistance moment is obtained. Finally, the effectiveness of simulation analysis is verified by comparing with the test results of physical prototype.

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