液压缸试验台加载平台的有限元分析

发布时间：2018-10-31 08:00

【摘要】：加载平台是液压缸试验台的重要组成部分,台架和滑车机构是加载平台的两个重要组成部分。本文对加载平台的台架和滑车中的关键零件进行了一系列的有限元结构分析,整体的台架结构由左台架、左中台架、右中台架、右台架、支架和中支架等部件组成,台架主要是用于承载和安装加载缸和滑车等零部件,其结构和受力状况比较复杂。滑车主要是由滑车架,拉压力传感器,销轴等零部件组成,它使试验缸和加载缸能够平稳的通过拉压力传感器来实现对顶连接,由于在液压缸试验的过程中加载平台受到的应力比较大,避免不了发生滑车的疲劳破坏,进而导致企业在生产和试验中蒙受很大的损失。因此,针对滑车和台架中的关键部件的设计显得十分重要,同时在提高加载平台的可靠性和使用寿命方面也具有一定的实际意义。本文应某液压缸厂家的要求,对加载平台中的台架和滑车等关键零部件进行有限元结构分析。分析了加载平台的结构特点,首先运用Pro/E软件分别对加载平台的台架和滑车做了实体建模,利用软件间的接口导入技术,达到数据共享;根据有限元离散化理论,依次建立有限元模型,进行网格划分,施加边界条件和定义载荷,最后通过计算获得分析结果。根据得到的分析结果,通过强度理论对台架和滑车中的关键零件进行结构强度校核,不仅获得了应力和应变的分布情况,且清晰确定了破坏易损区域。当台架和滑车的最大应力远低于材料的许用应力并完全满足强度要求的前提下,适当减小台架和滑车的厚度,以节约材料减轻机身重量。分析了产生疲劳破坏的原因,保证了设计的合理性和可靠性。该方法提高了加载平台设计效率,降低了加载平台设计与制造成本。值得提出的是,实际工作情况与本文的有限元分析结果十分吻合。因此,本文在理论分析上是客观可信的,且对实际的试验和生产过程都具有一定的指导意义。
[Abstract]:The loading platform is an important part of the hydraulic cylinder test bench, and the platform and the pulley mechanism are two important parts of the loading platform. In this paper, a series of finite element structural analysis is carried out on the platform and the key parts in the pulley. The overall structure of the platform is composed of the left stand, the left center stand, the right stand, the support and the middle support. The bench is mainly used to load and install load cylinder and pulley parts, its structure and mechanical condition are complex. The pulley is mainly composed of the pulley frame, pull pressure sensor, pin shaft and other parts. It enables the test cylinder and the loading cylinder to smoothly connect the top through the pull pressure sensor. Due to the large stress of loading platform in the process of hydraulic cylinder test, the fatigue failure of the pulley can not be avoided, and then the enterprise suffers great losses in production and test. Therefore, it is very important to design the key components of the pulley and the bench, and it is also of practical significance to improve the reliability and service life of the loading platform. At the request of a hydraulic cylinder manufacturer, this paper analyzes the finite element structure of the key parts of the loading platform, such as the bench and the pulley. The structural characteristics of the loading platform are analyzed. Firstly, Pro/E software is used to model the platform and the pulley, and the interface technology between the software is used to achieve data sharing. According to the theory of finite element discretization, the finite element model is established in turn, the mesh is divided, the boundary condition is applied and the load is defined. Finally, the analysis results are obtained by calculation. According to the results obtained, the structural strength of the key parts in the bench and the pulley is checked by the strength theory, not only the distribution of stress and strain is obtained, but also the region of failure is clearly determined. When the maximum stress of the platform and the pulley is far lower than the allowable stress of the material and fully meets the requirements of the strength, the thickness of the bench and the pulley is reduced appropriately, so as to save the material and reduce the weight of the fuselage. The causes of fatigue failure are analyzed to ensure the rationality and reliability of the design. This method improves the efficiency of loading platform design and reduces the cost of loading platform design and manufacturing. It is worth mentioning that the actual working conditions are in good agreement with the finite element analysis results in this paper. Therefore, this paper is objective and credible in theoretical analysis, and has certain guiding significance to the actual test and production process.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH137.51

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