车用磁流变减振器的研制

针对车用磁流变减振器现存的阻尼特性不理想、油封易磨损泄漏、磁流变液静置沉降以及磁路结构不尽合理等主要问题,提出了加装单向滑阀、组合密封器、静置稳定装置和多级磁路式电磁活塞等改进措施。以Passat B5轿车前悬架减振器作为设计对象,对磁流变减振器的电磁磁路和液压结构进行了改进设计,最后通过各项性能试验得到了较为满意的结果,表明了双筒滑阀式磁流变减振器的可行性和有效性。     

基于磁流变液减振器的履带车辆悬挂振动控制研究

选用履带车辆二自由度1/4的车体模型,分别针对被动悬挂系统和基于磁流变液(MRF)减振器的半主动悬挂系统建立了相应的数学模型,并在加上H∞控制算法后,得出了半主动悬挂系统的阻尼控制力。采用控制系统的分析和仿真软件MATLAB中的SIMULINK工具箱进行了被动及半主动控制的仿真,并将两次仿真结果进行了比较。结果表明,采用基于H∞控制算法的半主动悬挂系统的车身振动得到了明显控制。     

用于汽车悬架的磁流变减振器研究综述

磁流变液在汽车半主动悬架中的应用倍受关注。介绍了磁流变液的特性及磁流变减振器的工作原理,结合国内外最新研究成果,综述了用于汽车悬架的MR减振器的结构形式、仿真模型、控制方法和测试技术,并对今后的研究工作重点进行了探讨。     

履带车辆磁流变半主动悬挂系统控制算法研究

将磁流变阻尼器这种智能阻尼减振装置应用于车辆悬挂系统中，构成了新型的半主动悬挂系统。建立了1／2车体动力学动模型。研究了瞬时最优控制（IOC）和经典线性最优控制（COC）两种控制算法及其实现问题。通过对某型履带车辆在典型沙土路面激励下的振动响应进行仿真，得出了不同控制策略下车体的响应情况。比较分析表明，两种控制策略下磁流变半主动悬挂系统都有着较好的减振效果。     

基于磁流变阻尼器的履带车辆悬挂系统半主动控制

将磁流变阻尼器应用于履带车辆的悬挂系统中,研究了磁流变阻尼器在不同电流下的力学特性和耗能特性。建立了履带车辆二自由度车体振动模型,提出了基于线性二次型(LQR)最优控制理论的半主动控制算法。对典型沙土路面激励下履带车辆悬挂系统的半主动控制效果进行了仿真,与被动及开关控制的减振效果进行比较,得出了车体振动加速度、线位移、角加速度和角位移的响应曲线。结果表明,该控制算法对基于磁流变阻尼器的履带车辆悬挂系统有着很好的控制效果。     

工程车辆的磁流变液悬架系统的研究

磁流变液是一种新型智能材料 ,根据其所表现出的黏度随磁场变化的特性 ,文中提出并论证用这种材料来克服气液弹簧悬架系统的阻尼不可调和无法完全自适应环境变化的弱点 ,从而实现对工程车辆振动的半主动、实时控制 ,最终改善工程车辆的行驶平顺性的可行性     

基于磁流变阻尼器的半主动悬挂控制实验研究

将磁流变阻尼器应用于半主动悬挂系统。建立了基于磁流变半主动悬挂系统的二自由度1/2车体的履带车辆振动模型。应用LQR最优控制理论,提出了一种基于磁流变阻尼器的履带车辆半主动控制策略,并在振动实验台上进行了半主动控制实验,模拟了车辆通过正弦路面的情形,结果表明,应用该控制策略能得到良好的减振效果。     

履带车辆磁流变半主动悬挂系统滑模控制研究

建立了履带车辆1／2车体振动模型,设计了相应的滑移面和滑移模态控制器,得出了履带车辆半主动悬挂系统的实时控制阻尼力,并对路面激励下滑模控制与最优控制的减振效果进行了仿真。     

汽车悬架磁流变减振器的优化设计及仿真

基于磁流变减振器在汽车悬架减振系统半主动控制中的广泛应用,根据磁流变液的特点和磁流变减振器阻尼力与结构参数的关系,设计了新型的磁流变减振器,并对影响磁流变减振器性能的参数进行了优化和仿真.仿真计算表明,该磁流变减振器设计是一种能优化阻尼力的有效算法.     

我国磁流变悬挂控制系统取得突破

由重庆大学黄尚廉院士牵头的重庆市院士基金项目“基于磁流变减振器的汽车半主动悬架控制系统研究”,近日取得核心技术的重大突破。课题组人员不但研制出具有自主知识产权的磁流变液产品,还开发出了基于磁流变自适应悬架的微型客车和轿车两种整车平台的集成系统样车,完成了近万公里的实车道路试验,将整车的垂直振动加速度均方值平均降低20%。据介绍,磁流变液是一种新型智能材料,在外加磁场的作用下,液体的粘度会发生很大变化。运用这种液体可以制作磁流变刹车、减振器、离合器和阻尼器等高科技器件。磁流变液属于国际研究前沿技术,在车辆、…     

磁流变阻尼器阻尼力计算

Bingham模型能准确刻画磁流变阻尼器屈服后区的粘塑特性,基于该模型,阀式磁流变阻尼器阻尼力与速度的关系为与阻尼器结构参数有关的三次代数方程,文中求解了该代数方程,得到了阻尼力的解析表达式,分析了阻尼器结构参数对阻尼器阻尼特性的影响.文中的研究结论可用于指导磁流变阻尼器的设计.     

油气悬架外置机械感应阻尼阀特性研究

设计了一种无需任何电子控制系统就可实现阻尼调节的外置机械感应阻尼阀,分析了其工作原理、内部结构及其外特性。根据流体连续性方程、运动微分方程以及伯努利方程等理论建立了外置可调阻尼阀数学模型,研究了该阻尼阀的阻尼特性。并通过仿真分析对比了外置机械感应阻尼阀和普通外置阻尼阀对车辆平顺性和车轮接地性的影响。仿真结果表明,所设计的外置感应阻尼阀可实现油气悬架阻尼力的两级调节,使车辆平顺性和操纵稳定性得以改善。     

履带车辆悬挂系统稳定性分析

履带车辆悬挂系统不仅直接影响到车辆的平顺性和舒适性,而且对履带车辆的稳定性能和行进间射击精度有着重要的影响。基于履带车辆建立了路面模型和车辆悬挂系统的二自由度动力学模型,采用Simulink对悬挂系统动力学模型进行仿真计算,并通过改变悬挂的阻尼刚度和弹簧刚度来分析其对车辆稳定性和车辆射击精度的影响,为悬挂系统的设计提供基础。     

某高速履带式装甲车悬挂系统动力学仿真

基于多刚体动力学理论建立了高速履带车辆悬挂系统与地面作用的动力学模型,基于贝克理论建立路面,研究了高速履带车辆在工况为爬行60°坡时悬挂系统的动力学响应问题,分析了车辆爬60°坡在2种不同路面上左、右履带的平均转矩,并且和计算求得理论转矩进行比较,分析得出仿真数据和理论数据误差率在5%内,模型特别考虑了履带对履带车辆动力学响应的影响.     

Remote control system based on the Internet and machine vision for tracked vehicles

Journal of Mechanical Science and Technology - A remote control system based on the Internet and machine vision is designed in this study for tracked vehicles. The system consists of remote...     

履带车辆坡道转向特性研究

针对研究履带车辆坡道转向力学特性的必要性和重要性;根据履带车辆转向的运动特点,对履带车辆坡道转向条件进行分析,建立了坡道转向动力学模型,推导出压力中心偏移量、接地面瞬时转向中心偏移量、转向阻力矩、转向所需的制动力和牵引力随着履带车辆方位角的变化关系.通过实例计算,分析了接地面瞬时转向中心偏移量和转向所需的制动力和牵引力的变化规律及不同转向半径和坡度对转向稳定性的影响,指出了导致履带车辆坡道转向的不稳定因素.     

Research on magnetorheological damper suspension with permanent magnet and magnetic valve based on developed FOA-optimal control algorithm

Due to the fail safe problem, it was difficult for the existing Magnetorheological damper (MD) to be widely applied in automotive suspensions. Therefore, permanent magnets and magnetic valves were introduced to existing MDs so that fail safe problem could be solved by the magnets and damping force could be adjusted easily by the magnetic valve. Thus, a new Magnetorheological damper with permanent magnet and magnetic valve (MDPMMV) was developed and MDPMMV suspension was studied. First of all, mechanical structure of existing magnetorheological damper applied in automobile suspensions was redesigned, comprising a permanent magnet and a magnetic valve. In addition, prediction model of damping force was built based on electromagnetics theory and Bingham model. Experimental research was conducted on the newly designed damper and goodness of fit between experiment results and simulated ones by models was high. On this basis, a quarter suspension model was built. Then, fruit Fly optimization algorithm (FOA)-optimal control algorithm suitable for automobile suspension was designed based on developing normal FOA. Finally, simulation experiments and bench tests with input surface of pulse road and B road were carried out and the results indicated that working performance of MDPMMV suspension based on FOA-optimal control algorithm was good.     

主动磁悬浮系统的Matlab仿真研究

介绍了主动磁悬浮系统的工作原理,并从单自由度主动磁悬浮系统入手,建立了线性化模型;根据此模型分析研究了系统必要的控制策略和PID控制参数的整定方法;利用Matlab实现了对某一单自由度磁悬浮系统的仿真,最终得出并分析了系统的阶跃响应曲线。     

Power control of dual-motor electric drive for tracked vehicles

The fundamental problem of the power control for the driving of a dual-motor drive electric tracked vehicle is analyzed. The tracked vehicle and its electric drive system are mathematically modeled. Power control schemes of the dual-motor drive system is put forward, designed, and analyzed, including the distributed control system and the two control schemes speed-regulation and torque-regulation. The field experiment shows that the two types of drive control schemes realize the driving function of the vehicle feasibly and effectively. Obviously the comprehensive controller and two motors’ controllers are closely coupled in the “speed-regulation” control scheme, in which they must coordinate very well to guarantee the control. Contrastingly, in the “torque-regulation” control scheme, the comprehensive controller and two motors’ controller are not dependent closely when the accuracy and response of the torque controlling is guaranteed. The latter is simpler and more practical than the former.     

Power control of dual-motor electric drive for tracked vehicles

The fundamental problem of the power control for the driving of a dual-motor drive electric tracked vehicle is analyzed. The tracked vehicle and its electric drive system are mathematically modeled. Power control schemes of the dual-motor drive system is put forward, designed, and analyzed, including the distributed control system and the two control schemes speed-regulation and torque-regulation. The field experiment shows that the two types of drive control schemes realize the driving function of the vehicle feasibly and effectively. Obviously the comprehensive controller and two motors’ controllers are closely coupled in the “speed-regulation” control scheme, in which they must coordinate very well to guarantee the control. Contrastingly, in the “torque-regulation” control scheme, the comprehensive controller and two motors’ controller are not dependent closely when the accuracy and response of the torque controlling is guaranteed. The latter is simpler and more practical than the former.