围限颗粒介质差速器自适应传动机理与性能优化

项目名称： 围限颗粒介质差速器自适应传动机理与性能优化

项目编号： No.51475475

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 机械、仪表工业

项目作者： 欧阳鸿武

作者单位： 中南大学

项目金额： 81万元

中文摘要： 颗粒介质因颗粒堆积结构与力学性能之间的奇妙耦合而产生令人惊奇的柔性。精妙地利用围限颗粒介质独特的屈服膨胀效应，有望形成新型自适应差速传动原理并引导技术革新。项目基于介观团簇及其相互作用决定围限颗粒介质稳定性和屈服行为的研究思路，引入围限相吸效应，建立融合力环和几何堆积结构的团簇结构双稳定性判据，改进数值模拟方法，并研发综合测试装置，系统研究不同围限强度下多种物性硬球颗粒屈服变形过程中多尺度力环与局部择优堆积结构相互耦合协同变形机理和力学响应；并基于非局域流动性概念，构建局部屈服与全域协同流动状态方程，求解获取密度分布、剪切变形速率和应力场等表征参数。项目旨在探明围限颗粒介质在复杂剪切作用下屈服膨胀时颗粒的协同运动模式、力学特性及其影响因素，探索新型差速传动原理及技术途径，逐步优化结构和传动性能，为研发低成本高性能全时自适应汽车差速器提供新的设计理念和理论指导。

中文关键词： 车辆动力学；动力学仿真；结构优化；动态测试

英文摘要： The coupling between particle packing structure and mechanical properties of granular media leads to an amazing flexibility. Ingenious use of the unique yield expansion effect of confined granules medium is expected to form a new adaptive differential transmission principle and guide the technological innovation. Based on the idea of that the stability and yield behavior of confined granular media depending on the mesoscopic clusters and their interactions, the introduction of confining attraction effect, the establishment of dual stability criterion of fusion power ring and geometry stacking structure to improve numerical simulation methods as well as the development of a comprehensive test device, the research project systematic study the synergistic coupling deformation mechanism and mechanical response of the multi-scale power ring and local preferentially structure during various hard-sphere particles yielding process under different confining strength. Besides, the state equation of local yield and global synergies flow will be built, based on the nonlocal liquidity concept, to obtain the density distribution, the rate of shear deformation, stress field and other characterization parameters. The project aims to determinate the collaborative movement patterns, mechanical properties and its influencing factors of confined granular media in yield expansion under complex shear action, to speed up the exploration of new differential transmission principle and technical way. With optimizing the structure and transmission performance of confined granular media, a new design concept and theoretical guidance can be provided to investigate the low-cost and high-performance full-time self-adapted differential for multi-axle drive vehicles.

英文关键词： Vehicle Dynamics;Dynamical Simulation;Structure Optimization;Dynamical Test