【作者】 孙小明；

【导师】 尹成龙；

【作者基本信息】 安徽农业大学 ， 机械设计及理论， 2009， 硕士

【摘要】 这是一个科技飞速发展的时代,产品开发的速度很大程度上决定着企业的经济效益。在产品研发或更新过程中应用虚拟设计技术和有限元分析法,可以极大地提高设计速度、降低成本、提高一次性设计成功率,进而为企业赢得先机。本文首先着重研究了QQ AMT系统的工作原理、结构特点和有限元求解的相关内容,然后在详细分析研究了目标车选换档过程受力情况的基础上完成了相关零件的设计。对有限元网格划分方法、单元格质量评价、求解精度检测和接触问题进行了研究。研究了目标车选换档系统的机械实现原理、同步器换档力影响因素,完成了目标车换档力的测量结果分析,并对目标车选换档摇臂在不同工况时的受力情况进行了详细的分析和计算,然后完成了其结构设计,最后完成其三维建模和有限元应力分析,得到了安全系数为1.86的三维实体模型。在对目标车选换档缸进行结构分析、换档原理分析的基础上,分别完成了选、换档缸缸径的设计和其他相关尺寸的确定。完成了目标车液压站的虚拟设计,得到其三维实体模型,并利用有限元分析法分别完成了液压站的模态和应力分析,经过反复的分析计算和结构修改,最终建立了安全系数为4.6722的液压站三维实体模型。分析阐述了虚拟装配技术的原理、过程及复杂系统的虚拟装配方法,然后对AMT选换档系统进行了虚拟装配设计和装配干涉检验,以较为直观的方式显示了AMT选换档机构装配体中所有零部件的组装情况,为以后实物装配路径的制定提供参考,有效地提高了设计的速度。完成了选换档机构运动仿真模型的建立,然后根据选换档实现的位置和时间要求,分别完成其位置仿真和运动仿真,并对其各自仿真结果进行了分析。更多还原

【Abstract】 This is an era of rapid development of science and technology. The economic efficiency of enterprises is to a large extent determined by the speed of R & D. Using Virtual Design Technology and Finite Element Analysis (FEA) during the process of R & D and updating product can greatly improve the design speed, lower costs, improve the success rate of one-time design and then win the opportunity for enterprises. This paper mainly studied the principle of QQ AMT system, the structural characteristics and the relevant content of FEA, and then some relevant parts were designed on the basis of a detailed analysis of the forces during the shift process.The methods of FEA mesh generation, the quality evaluation of the elements, the solving precision testing and the contact problems have been studied.This paper also studied the mechanical principle of the vehicle’s electing and shifting system and the factors affecting the synchronizer shifting force, and the measure results analysis of shifting forces were completed. The force bearing of the vehicle’s electing and shifting rockers under different working conditions were analyzed and calculated in detail, and then their structural design was finished. Finally, their 3D solid models were built with a Safety factor of 1.86 and FEA was also used to analyze their stress.The elect and shift cylinder bore and the size of other relevant parts were designed after the analysis of the structure of the vehicle’s electing and shifting cylinder and the principle of shift.The vehicle’s hydraulic station virtual design was done and its 3D solid model was built. The stress and mode of hydraulic station were analyzed by FEA. In the end, a hydraulic station 3D solid model was built with a Safety factor of 4.6722 after repeated analysis and calculation and structural changes.The theory and process of virtual assembly technology and the methods of virtual assembly used in complex system were firstly analyzed, and then the virtual assembly design and interference testing of AMT electing and shifting system were done. The assembly process of AMT electing and shifting system was shown in an intuitive way, which could be used as reference to make the assembly path of physical products. The design speed has been effectively improved in this way.The motion simulation model of the electing and shifting machine was built, then its position simulation and motion simulation were done respectively in the requirement of location and time, and then their results were analyzed.更多还原