Output feedback control of linear fractional transformation systems subject to actuator saturation

In this paper, the control problem for a class of linear parameter varying (LPV) plant subject to actuator saturation is investigated. For the saturated LPV plant depending on the scheduling parameters in linear fractional transformation (LFT) fashion, a gain-scheduled output feedback controller in the LFT form is designed to guarantee the stability of the closed-loop LPV system and provide optimised disturbance/error attenuation performance. By using the congruent transformation, the synthesis condition is formulated as a convex optimisation problem in terms of a finite number of LMIs for which efficient optimisation techniques are available. The nonlinear inverted pendulum problem is employed to demonstrate the effectiveness of the proposed approach. Moreover, the comparison between our LPV saturated approach with an existing linear saturated method reveals the advantage of the LPV controller when handling nonlinear plants.     

Dynamic output feedback control of saturated switched delay systems under the PDT switching

This paper is devoted to saturated control of switched delay systems. The main focus is to find a suitable switching law and saturated output feedback controllers such that the closed‐loop systems are asymptotically stable and have the disturbance tolerance/rejection capacity. A mixed slow/arbitrary switching approach, so‐called persistent dwell time (PDT) switching, is used to design the switching law. Compared with the slow switching, it is more general and leads to more flexibility in the process of constructing switching signals. More importantly, the proposed PDT is dependent on state delay, which includes the previous delay‐independent PDT. Next, time‐varying ellipsoids and a prescribe l₂‐gain are introduced to characterize the disturbance tolerance and rejection capacities of systems, respectively. Based on the proposed results, the relation between delay‐dependent PDT and level of disturbance tolerance/rejection is shown. Finally, saturated controllers working in time‐varying hull controllable regions are designed. Thus, the considered problem is solved. An example is exploited to illustrate the effectiveness of the proposed results. Copyright © 2016 John Wiley & Sons, Ltd.     

单向执行器系统配置的完整性

提出了配置完整性的概念,用来表征单向执行器系统控制作用的生成能力.并且将 配置完整性归结为线性方程组正解的存在性问题,给出了配置矩阵完整性的若干性质和判 别条件及其相应的判别步骤.     

线性系统的容错控制

在这篇文章里 ,我们考虑一类线性系统的鲁棒跟踪控制器设计问题 .对执行器故障和控制面故障情况 ,提出了容错的鲁棒控制器的设计方法 .此设计方法能够保证闭环系统是稳定的     

国产矿井提升机PC电控系统没有完全实现PC化的主要原因及对策

阐述了国产矿井提升机PC电控系统的发展过程及现状 ,指出了其没有完全实现PC化的主要原因 ,并提出了使其完全PC化的对策。最后 ,介绍了提升机制动系统用PC控制的实现方法。     

Casting traceability with direct part marking using reconfigurable pin-type tooling based on paraffin–graphite actuators

Green sand moulding machines for cast iron foundries are presently unable to uniquely identify individual castings. An insert tool concept is developed and tested via incremental mock-up development. The tool is part of the pattern plate and changes shape between each moulding, thus giving each mould a unique ID by embossing a Data Matrix symbol into the sand. In the process of producing the mould, each casting can be given a unique (DPM), enabling part tracking throughout the casting's life cycle. Sand embossing is achieved with paraffin-actuated reconfigurable pin-type tooling under simulated processing conditions. The marker geometry limitations have been tested using static symbol patterns, both for sand embossing and actual casting marking. The marked castings have successfully been identified with decoding software. The study shows that the function of each element of this technology can be successfully applied within the foundry industry.     

高微重力振动隔离系统激励器分配优化设计

为了满足高微重力振动隔离系统实时变化的控制器输出要求,同时也为了降低隔振系统激励器的功耗,对激励器分配组合进行了分配优化设计.介绍了激励器分配电流的计算方法,给定浮子质心作用力计算各种组合的激励器分配电流,对结果进行比较分析后确定出最优组合.通过给定相对位置、变化的质心作用力进行地面测试,结果表明了设计结果的合理性.     

汽车转向/防抱死制动系统的非线性鲁棒协调控制

针对汽车转向系统和防抱死制动系统的协调控制问题,提出一种新的非线性鲁棒协调控制系统.该控制结构由转向控制器和制动控制器组成.为了改善整个系统的鲁棒性和协调性,根据汽车转向和制动非线性综合模型,基于Hamilton函数方法设计了汽车非线性鲁棒协调控制器.该控制器通过预置状态反馈完成系统的耗散Hamilton函数实现.设计了适用于复杂工况的制动力分配策略.仿真结果验证了所设计控制算法的稳定性和有效性.     

引入乘客动力学的1/2车辆液压主动悬挂系统建模与控制

建立了引入乘客动力学以及考虑液压装置动态特性的1/2车辆非线性主动悬挂模型，并在此模型的基础上提出了线性二次型最优控制与非线性Backstepping方法相结合的控制策略．仿真结果验证了该控制策略的有效性．     

用交流伺服电机和PLC改造液压控制系统

针对某落地镗床相对落后的液压控制系统,提出了采用先进成熟的PLC技术和交流伺服电机的控制系统对其进行改造。实践证明,改造后的控制系统在运行稳定可靠、维护简单易行,改善工作环境等方面都得到很大的提高,并对传统机床的电气改造具有一定的借鉴意义。