共查询到19条相似文献,搜索用时 62 毫秒
1.
2.
3.
4.
5.
6.
电液比例阀控液压缸系统建模与仿真 总被引:1,自引:0,他引:1
介绍了比例阀控非对称液压缸位置控制系统的组成及原理,重新定义了负载压力和负载流量,推导出系统的数学模型,并利用Matlab进行了仿真分析,设计了PID控制器对系统进行校正,结果表明系统模型正确,校正后的系统比校正前有更高的精度和更好的稳定性。 相似文献
7.
本文对多缸同步系统建立数学模型,进行动态分析,并提出了同步系统模拟试验新方法。目前,该成果已成功地用于大型冶金自动线设备上。实践表明:它高效实用,并有显著经济效益。 相似文献
8.
9.
10.
本文介绍了三块双层升降舞台液压系统的设计原理,论述了采用计算机和电液比例调速阀控制同步运动的控制原理。实测结果表明:同步运动平稳,同步误差小于0.2%。 相似文献
11.
Yang Jian College of Urban Railway Transportation Shanghai University of Engineering Science Shanghai China Xu Bing Yang Huayong State Key Laboratory of Fluid Power Transmission Control Zhejiang University Hangzhou China 《机械工程学报(英文版)》2005,18(4):597-602
A robust control algorithm is proposed to focus on the non-linearity and parameters' uncertainties of an electro-hydraulic proportional speed control system (EHPSCS) with a single-rod hydraulic actuator.The robust controller proposed does not need to design stable compensator in advance,is simple in design and has large scope of uncertainty applications.The feedback gains of the robust controller proposed are small,so it is easily implemented in engineering applications. Experimental research on the speed control under the different conditions is carried out for an EHPSCS.Experimental results show that the robust controller proposed has better robustness subject to parametric uncertainties,and adaptability of parameters' variation of control system itself and plant parameter variation. 相似文献
12.
13.
针对先进歼击机功率电传作动系统舵面控制的需求,提出了一种具有电气一液压复合调节容积式舵机的结构方案,并讨论了这种舵机的操纵状态和工作特性。在此基础上,推导了描述舵机动态特性的非线性状态方程。然后,采用非线性系统的几何控制理论,证明了系统满足精确线性化的条件,并给出了基于时间—误差性能指标(ITAE)最小的最优控制律,成功地解决了复合舵机控制系统存在的交联问题和相乘非线性问题。所提出的控制方法奠定了电气—液压复合舵机非线性控制理论的基础。 相似文献
14.
15.
Wei Jianhua Guan Cheng State Key Laboratory of Fluid Power Transmission Control Zhejiang University Hangzhou China 《机械工程学报(英文版)》2005,18(2):224-227
The velocity tracking control of a hydraulic servo system is studied. Since the dynamics of the system are highly nonlinear and have large extent of model uncertainties, such as big changes in load and parameters, a derivation and integral sliding mode variable structure control scheme (DI-SVSC) is proposed. An integral controller is introduced to avoid the assumption that the derivative of desired signal must be known in conventional sliding mode variable structure control, a nonlinear derivation controller is used to weaken the chattering of system. The design method of switching function in integral sliding mode control, nonlinear derivation coefficient and controllers of DI-SVSC is presented respectively. Simulation shows that the control approach is of nice robustness and improves velocity tracking accuracy considerably. 相似文献
16.
高速高精度叠层直线运动控制系统 总被引:4,自引:0,他引:4
在分析粗精动控制系统的耦合及轨迹分配等问题的基础上,介绍叠层试验台高速高精度直线运动的实现: 采用永磁直线交流电动机驱动粗动台,粗动台行程大但带宽较低;音圈电动机驱动精动台,精动台带宽高但行程较小。用绝对空间闭环方式实现试验台的粗精运动控制,这种方法可以忽略粗动台对精动台的惯性力扰动,精动台直接跟踪给定轨迹,粗动台跟踪精动台的运动轨迹防止精动台发生运动饱和。试验结果表明,精动台显著提高了系统的定位和跟踪精度,该控制方法使叠层试验台的高速高精度运动得以方便实现。 相似文献
17.
电液伺服动态试验机作动器固有频率的提高和性能曲线分析 总被引:2,自引:0,他引:2
通过对电液伺服动态试验机作动器主要性能指标-固有频率的理论分析,提出提高作动器固有频率的设计方法,对其性能曲线进行了理论分析,提出了在线性坐标纸上绘制性能曲线的方法,并对以上理论分析进行也实际工程的验证,该方法无论对试验机设计人员还是对试验机应用人员都具有较高的工程实际应用价值。 相似文献
18.
19.
Gao PuSchool of Mechatronics Lanzhou Jiaotong University Lanzhou ChinaLi YunhuaSchool of Automation Control Beijing University of Aeronauticsand Astronautics Beijing ChinaSheng WanxingChina Electric Power Research Institute Beijing China 《机械工程学报(英文版)》2004,17(3):472-476
Combining with the characteristic of the fuzzy control and the neural network control(NNC), a new kind of the fuzzy neural network controller is proposed, and the synthesis design method of the control law and fast speed learning algorithm of the parameters of networks are put forward. The output of the controller is composed of two parts, part one is derived on basis of the principle of sliding control, the lower order model and the estimated parameters of the plant are only required, part two is derived on basis FNN, it is used to compensate the uncertainties of the systems. Because new type of FNN controller extracts from the advantages of the intelligent control and model based sliding mode control, the numbers of adjusting parameters and the structure of FNN are simplified at large, and the practical significance and variation range are attached to each layer of the network and its connected weights, the control performance and learning speed are increased at large. The lightness of the conclusions 相似文献