摩托车减震器阻尼特性数学建模与内部流场模拟分析

发布时间：2018-04-04 10:55

本文选题：减震器　切入点：阻尼特性　出处：《江苏科技大学》2016年硕士论文

【摘要】：摩托车是现代化的交通工具之一,从其被发明到使用至今,已有一百多年的历史。因为其便捷的驾驶方式和很好的路面适应性,仍然有很大市场。摩托车的减震效果直接影响着摩托车行驶过程中的平稳性、安全性和人们的舒适度,而减震器就是起到减震作用的重要器件,因此减震器的设计尤为重要。近年来,随着计算机技术的发展,传统的减震器的设计方法得到一定的改良,但是仍然没有脱离经验设计的方法。本文完成了对WH150型摩托车双筒液压后减震器的参数化数学建模与仿真。利用流体力学理论,建立阀系的上下压差与油液流经该阀系的流量的数学关系表达式,同时根据油膜边界理论,得出摩擦力数学计算公式。在此基础上利用MATLAB/Simulink建立数学模型并且进行仿真。因所建参数化模型是基于减震器的实际结构参数,所以该数学模型可以反映减震器实际的工作过程。通过仿真结果与实际测试结果之间的误差分析,验证了所建数学参数模型正确性。本文完成了对减震器内部阀系节流环形阀片的挠度变形的理论分析和计算。根据弹性力学对小挠度变形计算方法进行具体过程论述,推导出小挠度变形解析式。利用钱氏摄动法推导出减震器环形阀片大挠度通用解析式,同时给出一种基于有限元的求解大挠度通用解析式系数的方法,并且将所得结果与《机械设计手册》查表计算所得结果进行比较分析,得出相对误差很小,验证了本文方法的正确性。针对减震器内部流场的复杂性,借助计算机仿真,利用ANSYS Fluent软件,模拟了减震器的内部流场。基于流体力学理论,利用数值模拟分析的方法对减震器内部流场进行分析描述,揭示了流体运动规律和减震器参数对流场的影响。
[Abstract]:Motorcycle is one of the modern means of transportation. It has a history of more than 100 years since it was invented and used.Because of its convenient driving mode and good road adaptability, there is still a large market.The shock absorption effect of motorcycle has a direct impact on the ride stability, safety and people's comfort, and the shock absorber is an important device to reduce the vibration, so the design of the shock absorber is particularly important.In recent years, with the development of computer technology, the traditional design method of shock absorber has been improved to a certain extent, but there is still no method without experience design.In this paper, the parameterized mathematical modeling and simulation of double cylinder hydraulic shock absorber for WH150 motorcycle are completed.Based on the theory of fluid mechanics, the mathematical expression of the pressure difference between the upper and lower pressure of the valve system and the flow rate of oil flowing through the valve system is established. At the same time, according to the oil film boundary theory, the mathematical formula of friction force is obtained.On the basis of this, the mathematical model is established by MATLAB/Simulink and the simulation is carried out.Because the parameterized model is based on the actual structural parameters of the shock absorber, the mathematical model can reflect the actual working process of the absorber.The correctness of the mathematical parameter model is verified by the error analysis between the simulation results and the actual test results.In this paper, the theoretical analysis and calculation of the deflection of the throttle ring valve plate in the internal valve system of the shock absorber have been completed.According to elastic mechanics, the calculation method of small deflection deformation is discussed in detail, and the analytical formula of small deflection deformation is deduced.The general analytical formula for large deflection of annular valve piece of shock absorber is derived by using the Cheen's perturbation method, and a method of solving the general analytical coefficient of large deflection based on finite element method is given.The results obtained are compared with the results obtained from the table checking in the Manual of Mechanical Design, and the relative error is very small, which verifies the correctness of the method presented in this paper.In view of the complexity of the internal flow field of the shock absorber, the internal flow field of the absorber is simulated by means of computer simulation and ANSYS Fluent software.Based on the theory of fluid mechanics, the flow field inside the shock absorber is analyzed and described by means of numerical simulation analysis, and the influence of fluid motion law and the flow field of shock absorber parameters is revealed.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U483

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