高速履带车辆非线性振动冲击空间多体动力学研究

In this project, according to extensive investigation research status at home and abroad, scientific problems will be put forward about bottleneck and difficulty, which it is difficult to effectively predict travelling performance under strong nonlinear vibration impact conditions when designing high speed tracked vehicles of our country. Firstly, the problem which decouples the nonlinear multibody dynamics of the multi-axle vehicles will be solved. Secondly, connection algorithm and theoretical modeling of multi degree of freedom track will be studied, and rolling and sliding coupling mechanism among ground - Track - load wheel will be definited. Thirdly, dynamic tension calculation of track under high frequency vibration and transient impact conditions will be developed, thus independent model of muti-axle vehicles and track ring will be completed. After that, the research on two-track pavement spectrum coherence and non-stationary random shock excitation pavement model when vehicles run on changing speed will be made through deduction of spatial evolution spectra. The spatial multibody dynamics model of nonlinear vibration impact of high speed tracked vehicle will be built through combined operation and data interactive in real-time of the above two modules. In the end, model modification and verification will be completed and applied to prediction design of vehicle operation system. The target which design method is consummated, practical problems are solved and off-road mobility of the track vehicle improves will be realized.

本项目通过广泛调研国内外研究现状，针对我国高速履带车辆在设计中无法有效预测强非线性冲击振动工况下综合行驶性能的瓶颈和难点，提取出科学问题，通过虚功原理和变分法以及广义坐标的优化重构深入开展多轴车辆非线性多体动力学微分-代数方程组的解耦研究，探讨多自由度履带连接算法与理论建模、明确地面-履带-负重轮间的滚滑耦合作用机理，并开展履带在高频振动和瞬态冲击工况下动态张力的解析计算，从而完成多轴车辆和履带环两个子模块的独立建模，在此基础上通过对空间演变谱的推导开展车辆在变速行驶时双辙路面的路谱相干和非平稳随机冲击激励路面模型的构建研究，通过上述两个子模块的联合运算和数据实时交互构成高速履带车辆非线性冲击振动空间多体动力学模型，完成模型修正和试验验证，并应用到车辆行动系统的预测设计中，达到完善设计方法，解决实际问题和提升越野机动能力的目的。

本项目针对我国高速履带车辆在设计中无法有效预测强非线性冲击振动工况下综合行驶性能的瓶颈和难点，提取出科学问题，通过虚功原理和变分法以及广义坐标的优化重构深入开展了多轴车辆非线性多体动力学微分—代数方程组的解耦研究，探讨多自由度履带连接算法与理论建模、明确地面—履带—负重轮间的滚滑耦合作用机理，并开展履带在高频振动和瞬态冲击工况下动态张力的解析计算，从而完成了多轴车辆和履带环两个子模块的独立建模，通过上述两个子模块的联合运算和数据实时交互构成了高速履带车辆非线性冲击振动空间多体动力学模型，完成了模型修正和试验验证，计算精度达到80%以上，提出了完整的特性优化匹配方法，并应用到车辆行动系统的预测设计中，能够达到完善设计方法，解决实际问题和提升越野机动能力的目的。