【作者】 黄泽好；

【导师】 朱才朝；

【作者基本信息】 重庆大学 ， 机械设计及理论， 2006， 博士

【摘要】 目前摩托车系统动态特性研究一般采用多刚体动力学方法,没有考虑摩托车车架空间柔性体、人和路对摩托车动态特性的影响,致使其动态特性与实际存在较大的差别。因而开展考虑摩托车人-机刚柔耦合系统动力学研究具有重要的理论意义和工程实用价值。论文对刚柔耦合系统动力学理论基础、研究现状和发展趋势进行了论述,提出了用固定界面动态子结构法分析摩托车人-机刚柔耦合系统动力学特性的研究思路,把摩托车车架作为空间柔性体,考虑发动机和路面激励,建立了人-机-路环境下摩托车人-机刚柔偶合系统动力学模型,对耦合动力学模型的动态响应和平顺性进行了系统的研究,提出了摩托车振动平顺性评价方法。以某型号摩托车为例,建立车架有限元分析模型,分析其固有频率和振型,并通过实验模态方法验证理论模型的正确性。利用固定界面动态子结构法,建立摩托车人-机刚柔耦合系统动力学模型,定义刚柔耦合模型中车架与其它各部件的耦合关系,将乘员作为多刚体,发动机激励和路面激励作为载荷,建立了摩托车人-机刚柔耦合系统动力学模型,对模型的动态特性进行了研究,模拟了该车在加速、制动、转向等工况下系统的动态特性,对其动态特性进行了评价,部分实际实验结果验证了理论分析的正确性,对在发动机激励和路面随机激励下的耦合系统的动态响应进行了研究,对摩托车通过国家B级路面和凸台两种工况下系统的平顺特性进行了仿真分析,并根据摩托车特点和仿真分析以及道路实验研究,提出了摩托车振动平顺性评价方法;通过改变前后悬架刚度对摩托车系统的平顺特性进行优化研究,研究结论对摩托车整车开发及动态性能优化有一定指导意义。更多还原

【Abstract】 Nowadays, most researches about motorcycle’dynamic characteristics only based on the multi-rigid body dynamics method, but not reviewed the motorcycle frame as the spaced flexible body, and not considered in full the affection of person and road to motorcycle’s dynamic characteristics; these led the result far beyond the truth, so it is significant and has the engineering use value to develop the dynamics research of motorcycle’s man-machine rigid-flexible coupling system.This dissertation discussed the theoretical foundation, the research present status and development trend of rigid-flexible coupling system dynamics, and brought forward the research thoughts of using fix interface dynamic substructure method to analyze the dynamic characteristics of motorcycle’s man-machine rigid-flexible coupling system. Regarded motorcycle frame as a spaced flexible body, to take into account the excitation of engine and pavement to create the motorcycle’s man-machine rigid-flexible coupling system dynamic model under the man-machine-road environment, the dynamic response and ride comfort characteristics of the coupling dynamics model have been systematically researched,and based on the study on the evaluation of the vibration,the objective evaluation method for motorcycle riding comfort is presented。Taking a motorcycle of certain model as example, it established the frame’s FEM model and analyzed its natural frequency and vibration mode, and verified the correctness of theoretical model by experimental modal method. On this base, it intercepted the solved modal result to built the motorcycle’s man-machine rigid-flexible coupling system dynamic model and define the couplings’relationship between frame and other components of rigid-flexible coupling model, and built motorcycle’s man-machine rigid-flexible coupling system dynamic model by taking rider as multi-rigid body and the excitation of engine and pavement as load; by using this model, conducted research about certain model motorcycle’s man-machine rigid-flexible coupling system dynamic characteristics, modal analysis of whole system, analog simulation of motorcycle system dynamic characteristics under operating conditions of acceleration, brake and steering etc., and evaluation of its dynamic characteristics; partial actual test result verified the correctness of theoretical analysis. The dissertation analyzed the system dynamic response under excitation of engine and pavement roughness, and studied the system’s ride comfort under operating conditions of passing更多还原