永磁直线电机伺服系统非线性鲁棒控制器设计

针对永磁直线电机伺服系统数学模型非线性的特点设计L2鲁棒控制器,将跟踪和扰动抑制问题归结为L2控制问题.通过构造适当的存储函数得到描述系统L2控制器的定理;证明定理给出的控制器能满足干扰抑制和系统的渐近稳定.仿真结果表明,用该方法设计的系统能很好地抑制扰动和跟踪给定,满足对高性能永磁直线伺服系统控制的要求.     

直流位置伺服系统的二自由度分数阶控制

为提高直流位置伺服系统的控制性能,提出了一种2自由度（two degree-of-freedom,2DOF）分数阶控制方法．通过设计一种2DOF控制结构,实现了系统的跟随和抗扰特性的解耦控制;将内模控制（internal model control,IMC）与分数阶控制相结合,选用分数阶滤波器,推导出了跟随控制器和抗扰控制器设计方法;根据控制性能的要求,利用系统截止频率和最大灵敏度指标,实现了2DOF控制器参数的解析整定．仿真实验结果表明,2DOF分数阶控制方法具有良好的位置跟随特性和抗干扰能力．     

永磁直线伺服系统二自由度H∞控制器设计

对永磁直线伺服系统速度提出基于模型匹配的二自由度H∞动态控制器设计。将二自由度控制与H∞控制相结合,在建立模型匹配二自由度H∞控制系统状态空间模型的基础上,将直线伺服系统的速度动态控制器设计问题归结为标准的H∞控制问题,通过求两个Ricati方程的解得到H∞控制器,以保证永磁直线伺服系统的鲁棒性。仿真实验结果表明,用该方法设计的永磁直线伺服系统具有良好的抑制扰动和跟踪给定的效果,满足数控机床及机器人等高精度系统对直线伺服速度控制的要求。     

直线伺服系统非线性自适应鲁棒控制器优化设计的研究

对永磁直线电动机伺服系统提出非线性自适应鲁棒控制器的优化设计方法。在永磁直线伺服系统非线性数学模型的基础上,为实现对速度和电流的准确跟踪,建立了误差系统的动态模型。将跟踪和干扰抑制归结为非线性自适应鲁棒控制器设计问题,通过构造存储函数得到自适应鲁棒控制器的定理,以及电阻和电感的辨识算法。证明定理给出的控制器能满足干扰抑制和系统的渐近稳定。最后,用遗传算法对控制器的参数进行优化。仿真结果表明,用该方法设计的系统能很好的抑制扰动和跟踪给定,满足对高性能数控机床永磁直线伺服系统控制的要求.     

交流伺服系统可重构控制器的仿真研究

在交流伺服系统控制领域中，交流伺服系统控制器多为一个控制环一种控制策略。这导致了它的应用范围较窄的缺点。为了克服这缺点，提出一种交流伺服系统可重构控制器的设计方法，该控制器的各个控制环由多种控制策略组成。在应用时，根据伺服系统对性能的要求，结合文中给出的控制器策略选择依据和设计过程。对控制器的策略进行灵活重组，形成新的控制器以满足系统期望的性能要求。用MATLAB建立系统的仿真模型并对提出的可重构控制器的设计方法进行仿真分析，仿真结果证实这种方法是有效的。     

数据驱动的无模型自适应直线伺服系统精密控制和实现

针对现代制造业对高精度机床伺服系统的要求, 将数据驱动的无模型自适应控制方法应用到直线伺服系统的位置控制中, 控制器设计不包括直线伺服系统结构的任何信息, 是直接基于动态线性化模型中伪偏导数的估计和预报, 而伪偏导数是根据直线电机电压输入和位置输出在线估计的. 永磁同步直线电机运动控制系统的实时实验结果表明, 在相同条件下, 数据驱动的无模型自适应控制方法的位置跟踪误差比PID减小了0.4mm到2.6 mm, 比神经网络控制时减小了0.2mm到0.5 mm. 该方法还提高了对负载扰动的鲁棒性.     

基于微分观测器的飞行模拟转台伺服系统非线性控制

飞行模拟器转台伺服系统是导弹飞行的重要模拟设备,用于获取实验数据。针对飞行模拟转台伺服系统在跟踪控制过程中存在参数不确定性、非线性摩擦等不确定性问题,提出了一种基于微分观测器的飞行模拟转台伺服系统非线性控制方法;考虑系统在跟踪控制过程中存在不确定性问题,设计了微分观测器来估计复合不确定扰动;设计非线性控制器来控制飞行模拟转台伺服系统,使得系统可以收敛到期望位置转角信号;通过李雅普洛夫稳定性证明控制器作用在系统条件下的鲁棒性;通过MATLAB/Simulink仿真试验平台验证了文中提出的控制策略能够使系统有效跟踪期望位置转角,具有一定工程应用价值;     

基于非线性参数的电液伺服系统滑模控制

针对在电液伺服系统跟踪控制中存在非线性不确定参数和外界扰动的问题,提出了一种基于积分微分器的滑模Lyapunov函数的控制方法。首先,在只有位移信号测量输出的情况下,采用高阶积分链式微分器对其速度和加速度信息进行预估。系统存在非线性不确定参数,利用微分器对状态和不确定项的实时估计,设计出积分滑模控制器,实现自适应规律以及对电液伺服系统中不确定扰动的抑制。搭建电液伺服系统AMESim模型并与Matlab构成联合仿真平台,对控制器进行仿真。仿真表明,该控制器具有良好的对非线性不确定参数变化的补偿能力和跟踪性能。     

2自由度PID控制的运动控制器参数自设计

提出了一种基于 2自由度PID控制 ,用于伺服系统 ,能够根据系统所要求的性能指标自动设计并调节参数的智能运动控制器的设计方法。仿真结果表明 ,这种控制器经过有限次的参数自动调整 ,能够满足性能指标的要求 ,对实际中工程技术人员调整控制器参数具有参考价值     

一种神经元控制模型参考自适应伺服系统

针对存在于摩擦非线性和负载转动惯量时变的伺服系统,提出一种神经元模型参考自适应控制设计方法。导出了控制对象离散数学模型,介绍了伺服系统结构和控制器设计,并用波波夫超稳定性理论证明该系统是渐近超稳定的。仿真结果表明系统具有良好的动态性能、稳态精度和鲁棒性。     

On a nonlinear problem of a sequential control with a parameter

The problem of evasion of a group of moving points from a nonlinear controlled object, whose goal is consecutively approach these points in a prescribed order, is analyzed. The movement of each point is defined uniquely by a scalar parameter chosen at the initial time instant. The controlled object minimizes a certain cost function, and the group of the points, acting cooperatively, maximize this cost function by choosing the parameters. Necessary optimality conditions for parameters are obtained. A model problem of an evasion of moving points from a vehicle is solved.     

Three-Link Mechanism as a Model of a Person on a Swing

Journal of Computer and Systems Sciences International - We model movements of a person swinging on a swing. We consider a flat three-link hinged mechanism as the main mechanical model of the...     

Splitting a configuration in a simplex

This paper presents a new method of partition, named-splitting, of a point set ind-dimensional space. Given a pointG in ad-dimensional simplexT, T(G;i) is the subsimplex spanned by G and the ith facet ofT. LetS be a set ofn points inT, and let be a sequence of nonnegative integers ₁, ..., n_d+1 satisfying _i=1 ^d+1 ₁=n The-splitter of (T, S) is a pointG inT such thatT(G;i) contains at least _i points ofS in its closure for everyi=1, 2, ...,d + 1. The associated dissection is the re-splitting.The existence of a-splitting is shown for any (T, S) and, and two efficient algorithms for finding such a splitting are given. One runs inO(d²n logn + d³n) time, and the other runs inO(n) time if the dimensiond can be considered as a constant. Applications of re-splitting to mesh generation, polygonal-tour generation, and a combinatorial assignment problem are given.     

Combining a monad and a comonad

We give a systematic treatment of distributivity for a monad and a comonad as arises in giving category theoretic accounts of operational and denotational semantics, and in giving an intensional denotational semantics. We do this axiomatically, in terms of a monad and a comonad in a 2-category, giving accounts of the Eilenberg–Moore and Kleisli constructions. We analyse the eight possible relationships, deducing that two pairs are isomorphic, but that the other pairs are all distinct. We develop those 2-categorical definitions necessary to support this analysis.     

Not a castaway but a stowaway

A portable keyboard that's no larger than my phone, that's theiGo Stowaway.     

Motion control of a rotor with a cavity with a viscous fluid

A formulation and solution procedure of optimal control problems for perturbed relative uniform motion of a body with a cavity filled with a viscous incompressible fluid are proposed. In this paper, the case with a cylinder is considered; however, this approach is basically true for the a cavity of an arbitrary form. The formula for the angular velocity of perturbed motion depending on an external perturbing element is devised. After that, we have a possibility to set different optimal control problems and apply the formalism elaborated in the optimal control theory. Two illustrated problems are given.     

Building a sonar map in a specular environment using a singlemobile sensor

The physical properties of acoustic sensors are exploited to obtain information about the environment for sonar map building. A theoretical formulation for interpreting the sensor databases on the physical principles of acoustic propagation and reflection is presented. A characterization of the sonar scan that allows the differentiation of planes, corners, and edges in a specular environment is described. A single sensor mounted on an autonomous vehicle in a laboratory verifies the technique. The implications for sonar map building and the limitations of differentiating elements with one sensor are discussed