路面谱随机激励下的轮式发射系统动力学建模与仿真  

Modelling and simulation of driving dynamics of wheeled launch system under random road surface excitation

作　　者：伍根洋 芮筱亭 王国平 江民 王勋 Genyang Wu;Xiaoting Rui;Guoping Wang;Min Jiang;Xun Wang(Institute of Launch Dynamics,Nanjing University of Science and Technology,Nanjing 210094,China;National Key Laboratory of Complex Multibody System Dynamics,Nanjing 210094,China)

机构地区：[1]不详

出　　处：《Acta Mechanica Sinica》2024年第5期161-174,共14页力学学报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant Nos.92266201,52305112,and 11972193);We also gratefully acknowledge Jiangsu Funding Program for Excellent Postdoctoral Talent(Grant No.2022ZB244);Project funded by China Postdoctoral Science Foundation(Grant Nos.2022TQ0159,and 2022M721624).

摘　　要：轮式发射系统行驶动力学建模与仿真是其动力学性能和试验设计的前提和基础,日益提高的轮式发射系统动态性能迫切需要一种快速高效的大型多体系统动力学计算方法。本文采用多体系统传递矩阵法建立了轮式发射系统的动力学模型,给出了相应的拓扑图和动力学方程,此外,通过快速傅里叶逆变换重构了平行车轮的路面不平度,结合蒙特卡罗方法对随机路面激励下轮式发射系统的动力学特性进行了模拟和讨论分析结果表明,随着路面不平度级别和行驶速度的增加,轮式发射系统的振动加速度幅值越大,在正常车速下,路面激励对车体的影响远大于车速。模态试验和行驶试验验证了动力学建模和仿真的正确性本文可拓展到其他包含概率不确定性的多体系统动力学建模和分析.Modelling and simulation of driving dynamics is the prerequisite and basis for the dynamics performance and test design of the wheeled launch system(WLS).With the improvement of dynamics performances of the WLS,a fast and efficient dynamics computational method for large-scale multibody systems is urgently needed.This research proposes a dynamics model to investigate the characteristics of the WLS using the transfer matrix method for multibody systems,and the corresponding topology and dynamics equations are established.Based on the inverse fast Fourier transform(IFFT)method,the mathematical model of road roughness for parallel wheels is reconstructed.Combined with the Monte Carlo method,the dynamic characteristics of WLS under random road surface excitation are simulated and discussed.The analysis results indicate that as road roughness grade and driving speed increase,the vibration amplitude of acceleration of the WLS becomes larger.Within the normal speed,the influence of road excitation on the vehicle body is much greater than vehicle speed.Modal test and driving test validate the correctness of dynamics modelling and simulation.This study can be expanded to other multibody systems that contain probabilistic uncertainties for dynamics modelling and analysis.

关 键 词：路面不平度 行驶速度 多体系统动力学 加速度幅值 路面激励 行驶试验 随机激励 路面谱 

分 类 号：O313[理学—一般力学与力学基础]