共查询到20条相似文献,搜索用时 93 毫秒
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针对液压动力转向装置,介绍了一种利用双泵提供稳定的转向流量的稳流阀,并就其结构、功能、工作原理以及设计准则进行了探讨, 得出了几点有益的结论 相似文献
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磁悬浮列车空气悬架系统研究 总被引:3,自引:1,他引:2
分析了磁悬浮列车空气悬架系统的基本要求和目前存在的主要问题,给出了一种经过试验验证的新型空气悬架系统,介绍了其工作原理和设计。该系统较好地解决了目前磁悬浮列车空气悬架系统中的一些棘手问题。 相似文献
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为解决电控空气悬架(electric control air suspension,简称ECAS)车身高度切换过程中的振荡及“过充”、“过放”现象,以空气弹簧特性为媒介,与车辆动力学相结合,对车身高度调节系统的进行建模.通过遗传算法优化车身高度调节系统PID的控制参数,提出一种新的积分分离PID控制策略.采用Matlab/Simulink搭建模型并对控制前、后仿真结果进行了对比.结果证明,所设计的控制方法能有效解决以上问题,优化后的车身高度调节系统能显著减少汽车振荡及干扰,操纵稳定性得到改善. 相似文献
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一、引言 现代活塞式压缩机使用的气阀,都是随着气缸内气休压力的变化而开、闭的自动阀。自动阀由阀座、运动密封元件(阀片或阀芯)、弹簧、升程限制器等零件组成。 气阀是活塞式压缩机的重要部件之一。气阀开、闭时,阀片所受到的气流推力是均匀的,而弹簧力是气阀开、闭的阻力。所以弹簧 相似文献
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空气悬架汽车在对其车身高度进行动态切换的过程中会严重受到随机干扰所带来的不良影响,为了解决这个问题,通过与空气弹簧的模型结合而建立整车模型,从而对随机干扰下汽车电控悬架车身高度的调节和控制进行研究。其中神经网络PID自适应高度调节控制器是利用单神经元自调整增益算法来设计的,并通过仿真软件对控制器的性能进行验证。根据仿真结果可验证所设计的控制器能够有效改善随机干扰对汽车电控悬架车身高度调节过程中产生的震荡,并使得车辆的稳定性和舒适性得到了提高。 相似文献
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The control problems associated with vehicle height adjustment of electronically controlled air suspension (ECAS) still pose theoretical challenges for researchers, which manifest themselves in the publications on this subject over the last years. This paper deals with modeling and control of a vehicle height adjustment system for ECAS, which is an example of a hybrid dynamical system due to the coexistence and coupling of continuous variables and discrete events. A mixed logical dynamical (MLD) modeling approach is chosen for capturing enough details of the vehicle height adjustment process. The hybrid dynamic model is constructed on the basis of some assumptions and piecewise linear approximation for components nonlinearities. Then, the on-off statuses of solenoid valves and the piecewise approximation process are described by propositional logic, and the hybrid system is transformed into the set of linear mixed-integer equalities and inequalities, denoted as MLD model, automatically by HYSDEL. Using this model, a hybrid model predictive controller (HMPC) is tuned based on online mixed-integer quadratic optimization (MIQP). Two different scenarios are considered in the simulation, whose results verify the height adjustment effectiveness of the proposed approach. Explicit solutions of the controller are computed to control the vehicle height adjustment system in realtime using an offline multi-parametric programming technology (MPT), thus convert the controller into an equivalent explicit piecewise affine form. Finally, bench experiments for vehicle height lifting, holding and lowering procedures are conducted, which demonstrate that the HMPC can adjust the vehicle height by controlling the on-off statuses of solenoid valves directly. This research proposes a new modeling and control method for vehicle height adjustment of ECAS, which leads to a closed-loop system with favorable dynamical properties. 相似文献
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建立了一个具有六自由度的客车横向振动力学模型及动力学运动方程,运用线性二次型最优控制方法,用MATLAB软件编写程序并计算出最优反馈矩阵K,并用Simulink进行了仿真计算及分析.结果表明采用主动悬挂技术可以有效改善车辆的横向振动性能. 相似文献