含频变、幅变非线性橡胶衬套的车辆多体系统动力学研究

Subjects in the study is focused on the multibody dynamics with nonlinear frequency- and amplitude-dependent rubber bushings, stduying on the dynamic modeling, experiments，numerical algorithms about the dynamic performance of the rubber bushing under coupled multiaxial loads with preload,frequency and amplitude dependence. Througth the theoretical analysis, numberical simulation, experimental verification and engineering application to present a sysytem modeling and solving methodology for the dynamics of multibody system with nonlinear frequency- and amplitude-dependent rubber bushing under coupled multi-axial loads. The major studies of the project include:experiments and finite element analysis for the frequency- and mplitude-dependent rubber bushing under multi-axial loads, the modeling based on the expriments and finite elememnt analysis for the nonlinear rubber bushing which including the effects of frequency- ,amplitude- and multiaxial loads-dependence,the efficient sloving algorithms for multibody systems with nonlinear rubber bushings which behaviour dependent on frequecy, amplitude and multiaxial laods,dynamic simulation and experiments on the vehicle multibody system including the nonlinear frequency-,amplitude- and multiaxial loads-dependent rubber bushings ,finding the effects which influcence on the vehicle ride， handling attributes, and providing the design optimization criteria for the rubber bushings with nonliner dynamic performance.

以含频变、幅变非线性橡胶衬套的车辆多体系统为研究对象，研究橡胶衬套在在多轴载荷作用下所呈现的与预载、激振频率、激振振幅相关且多轴耦合的动态特性所涉及的动力学建模、试验及相关的多体动力学求解等问题，通过理论分析、数值模拟、试验验证、工程应用，形成一套处理含幅变、频变橡胶衬套的多体系统动力学建模与求解理论与方法。重点研究如下关键问题:1）开展橡胶衬套的频变、幅变及多轴耦合试验及有限元分析；2）在试验与有限元分析的基础上分别建立橡胶衬套的频变、幅变非线性多轴耦合模型；3）研究含频变、幅变非线性多轴耦合橡胶衬套的多体系统动力学快速高效求解技术；4）针对含频变、幅变非线性橡胶衬套的车辆多体系统进行仿真分析与试验研究，研究橡胶衬套的频变、幅变、多轴耦合非线性动态特性对车辆平顺性、操纵稳定性等动态特性的影响规律，为车辆工程中橡胶衬套动态特性的设计与优化提供理论依据。

车辆中存在大量的橡胶衬套、空气弹簧等橡胶部件，这类部件的动态特性与预载、激振频率、激振振幅相关，其动力学模型的精度涉及车辆的NVH及耐久性等。开展橡胶衬套、空气弹簧的频变、幅变非线性动态特性模型研究及其与多体商业程序的集成对实际车辆工程具有重要的理论意义与实际工程价值。通过项目的研究丰富了车辆系统动力学的理论，取得的主要研究成果：提出了橡胶衬套的频变、幅变非线性多轴耦合模型；提出了空气弹簧的频变、幅变非线性耦合模型；搭建了含空气弹簧的整车仿真及试验验证平台；开发了衬套及空气弹簧的频变、幅变非线性耦合模型的辨识程序；研究了商用车制动系统建模及行驶状态估计算法；在国际期刊《SAE International Journal of Vehicle Dynamics，Stability and NVH》上发表了综述论文，项目共发表SCI收录论文10篇，EI收录论文19篇，完成了课题的研究内容及拟定目标。