山地自行车骑行动态性能研究论文.doc

CDIO项目设计(I)机械基础项目设计题目:自行车骑行动态性能研究学生姓名:学生学号:学部(系):专业年级:指导教师:2012年10月16日1摘要本文首先探讨了二维、完整约束情况下,计算多刚体系统动力学笛卡儿数学模型及算法的计算机程序实现;然后以山地自行车骑行动态性能分析为目的,针对某型全减振山地自行车开展了相应的试验与理论分析工作,利用计算机高级程序语言及多体动力学分析软件建立了较为完整的路面—山地自行车—骑行者系统,最后利用该系统对样车的骑行动态性能给出了评价。在笛卡儿数学模型及算法的程序实现上,本文结合软件工程知识,使用统一建模语言,对笛卡儿数学模型及算法的静态结构进行了系统的分析。在此基础上,针对二维、完整约束问题设计了一类计算多刚体系统动力学分析程序的结构,并使用计算机高级程序语言初步实现了该程序的运动学分析与动力学分析功能,最后选用了两个典型算例验证了本文动力学分析程序的正确性。该部分内容在自行设计完善的可用于山地自行车骑行动态性能分析的计算多体动力学分析软件方面进行了有益的探索。在山地自行车骑行动态性能分析方面,本文以某型全减振山地自行车为例,首先依据国家相关检测标准设计并进行了该款山地自行车车架的振动试验。在此基础上,本文扩展前述的车架模型,建立了完整的路面—山地自行车—骑行者系统,系统包括:使用谐波叠加法与ARMA(Auto-R平度模型;样车的多刚体动力学模型;包含力学模型与知觉模型的骑行者模型,其中的知觉模型参考ISO2631建立,为一种人体承受全身振动下的舒适性知觉模型。最后本文对已建立的路面—山地自行车—骑行者系统进行了动力学分析,利用骑行者知觉模型对样车骑行动态性能进行了评价并给出结果。评价结果认为该款山地自行车骑行动态性能欠佳,设计有待改进。研究建立的路面—山地自行车—骑行者系统为今后山地自行车进一步的力学分析提供了动力学模型基础,为山地自行车的计算辅助设计工作提供了一类具有可操作性的设计结果评价标准。关键词:计算多体动力学,笛卡尔数学模型计算法,路面—山地自行车—骑行者系统,骑行动态性能II。2目录摘要················································································································1第一章绪论··················································································································································································································································································································································5第二章山地自行车车架振动试验及仿真试验···························································································································································································································································································································································································································9第三章路—山—人系统的建立及其系统力学分析·····················································································