发动机链条张紧器的性能分析与设计

发布时间：2018-01-31 15:31

本文关键词： 液压链条张紧器动力学性能能量耗散率混气油液体积模量数字化设计　出处：《合肥工业大学》2016年硕士论文　论文类型：学位论文

【摘要】：为了研究液压链条张紧器的动力学性能,首先,通过引入变化的体积模量,建立考虑油液混气比和可压缩性的汽车张紧器动力学数学模型；其次,提出将能量耗散率和最大阻尼力作为评价指标,运用AVLExcite_TD软件进行动力学仿真以验证数学模型的正确性；最后研究了激励振幅、配合间隙大小、油液混气比、张紧器油液体积对动力学性能的影响以及建立了基于能量法的张紧器等效模型。为了开发张紧器数字化设计系统,首先,建立了扭簧式张紧器的数学模型,通过推力实验验证了模型的正确性,并分析了螺纹参数和扭簧参数对张紧器性能的影响；其次,针对数字化设计系统进行了需求分析和层次分析,设计了人性化的交互界面；最后,通过Visual Basic软件对三维CAD软件SolidWorks和ACCESS数据库软件进行了二次开发编程。研究结果表明：通过合理设计配合间隙大小、油液混气比、张紧器高压腔体积及其调节装置能显著提高液压链条张紧器的动力学性能；应用张紧器数字化设计系统实现了关键参数设计、三维模型重建、数据和文件存储等功能,能够快速完成具有不同输出性能要求的变型设计,有效提高了张紧器的设计效率。
[Abstract]:In order to study the dynamic performance of hydraulic chain tensioner, a dynamic mathematical model of automobile tensioner considering oil / gas mixture ratio and compressibility is established by introducing variable volume modulus. Secondly, the energy dissipation rate and the maximum damping force are taken as the evaluation indexes, and the dynamic simulation is carried out by using AVLExcite_TD software to verify the correctness of the mathematical model. Finally, the amplitude of excitation, the size of matching clearance and the ratio of oil to gas mixture are studied. The effect of oil volume on the dynamic performance of tensioner and the equivalent model of tensioner based on energy method are established. In order to develop the digital design system of tensioner, the mathematical model of torsion spring tensioner is established. The correctness of the model is verified by the thrust experiment, and the effects of thread parameters and torsion spring parameters on the tensioner performance are analyzed. Secondly, the requirement analysis and hierarchical analysis are carried out for the digital design system, and a humanized interactive interface is designed. Finally. The software SolidWorks and ACCESS database software of 3D CAD are developed and programmed by Visual Basic software. The results show that:. Through the reasonable design of the size of the fit clearance. The dynamic performance of hydraulic chain tensioner can be improved significantly by oil / gas mixture ratio, volume of high pressure chamber of tensioner and its regulating device. The key parameter design, 3D model reconstruction, data and file storage functions are realized by using tensioner digital design system, and the variant design with different output performance requirements can be completed quickly. The design efficiency of tensioner is improved effectively.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U464

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