基于反演设计的机器人操纵臂的变结构控制

针对由电机驱动的机器人操纵臂，研究了非线性系统的变结构控制。在一定的假设条件下。给出了变结构系统中滑动模态存在的条件及变结构控制律设计的方法。然后利用反演设计方法构造变结构控制的切换函数，以获得稳定的滑动模态。将设计方法应用于机器人操纵臂的控制律设计，并进行了仿真研究。     

钢板宽度测控系统数学模型及控制方法的研究

本文对钢板宽度测控系统中的数学模型进行了深入的分析和研究，并根据系统运行的实际状态对该模型进行简化，提出了一种变结构双模控制方法，将线性控制与非线性控制有机结合，并在实际系统中实现了这一方法。     

自动钢板剪切系统数学模型及控制方法的研究

本文对自动钢板剪切系统中的数学模型进行了深入的分析和研究，并根据系统运行的实际状态对该模型进行简化，提出了一种变结构双模控制方法，将非线性控制与线性控制有机地结合起来，并在实际系统中实现了这一方法。     

一种机电液系统的模糊变结构模糊控制器

车辆机械式干摩擦离合器及其执行机构具有非线性、时变、变结构特点，此类机电液系统的快速跟踪控制较困难。提出一种变结构模糊控制器，此控制器具有特征识别与处理环节，能够在线调节参数和根据系统特征状态选择合适的控制模式；此控制器带有前馈环节，可以提高系统的快速响应能力。利用此模糊变结构控制器对离合器进行斜坡和二次曲线快速跟踪控制试验，结果表明，此模糊控制器对一类非线性、时变、变结构特点的机电液系统具有一定     

一类三阶非线性动态滑模变结构控制

针对动态滑模变结构控制策略,研究了一类带有参数不确定项的非线性系统的变结构控制问题.分析了在未知扰动下的三阶非线性系统的输出调节问题,证明了基于李亚普诺夫稳定性理论意义下的动态滑模变结构控制律的稳定性,该控制律能使系统快速达到滑模状态,保证了系统误差的快速收敛性及对外部扰动和参数不确定性的不敏感性,最后给出的仿真实例证实了理论分析结果的正确性.     

人工心脏泵磁悬浮转子非线性特性及控制方法研究

引入滑动模态变结构控制，对转子转速大于6000r／min时转子产生的颤振及转子在强干扰下产生的新的平衡位置等非线性效应进行控制。以轴向为例取切换函数，滑动模态按指数律趋向原点，推导出了等效控制方程。用电锤给轴向磁悬浮转子施加冲击干扰，观察变结构控制的结果，发现系统在短暂调整后即恢复平衡位置，渐近稳定，说明采用变结构控制的适应性较好。利用变结构控制对内部参数变动和外部扰动作用不变这一显著特点，可有利于控制血液应力及粘弹性等非线性因素造成的转子扰动，从而使得系统数学模型的不准确性、实际系统的不确定性及镇定的复杂性得以解决。     

气液联控柔顺力控制系统的建模和仿真

该文提出了基于PWM控制气液联控位置系统的建模方法。运用滑动模态变结构理论中的经典非线性设计方法，设计了二阶滑模面变结构控制器。针对机械手臂的阻抗控制中力控制的难点在于不能精确的知道环境的刚度和位置从而导致给定参考位置的误差，应用离线环境参数估计的方法进行了仿真研究，仿真结果说明该方法能够较好的进行气液联控机械手臂柔顺力控制。     

基于KingView 6.5平台的复杂温度控制系统设计

为了研究时变，非线性，大时延，变参数的广义温度被控对象，本文设计并研制了一套基于工控机结构的在线控制系统，该系统采用了组态软件“KingView”对水温进行双环PID串级控制，实验表明，双环PID串级控制能够满足控制品质的要求。     

液压同步运动系统变结构控制设计

该文以一执行器的实际运动轨迹作为另一执行器的理想跟踪目标，针对实际液压系统非线性时变特点，对两执行器的同步误差采用变结构控制策略。研究和仿真表明：采用变结构控制的液压同步运动系统，不仅具有较强的鲁棒性，而且有良好的动态品质和同步精度。     

变结构控制方法在电控离合器中的应用研究

针对系统的强非线性特点设计了变结构控制器，以改善自动离合器的控制特性，应用变结构控制方法，选取适当的初换函数，构造切换平面，使整个系统沿切换平面滑行直至平衡点，计算机仿真结果显示，该控制器跟踪指令信号性能良好，且具有较强的稳定性。     

VARIABLE STRUCTURE CONTROL APPLIED IN ELECTRO-HYDRAULIC SERVO SYSTEM WITH ANN

The variable structure control (VSC) theory is applied to the electro-hydraulic servo system here. The VSC control law is achieved using Lyapunov method and pole placement. To eliminate the chattering phenomena, a saturation function is adopted. The proposed VSC approach is fairly robust to load disturbance and system parameter variation. Since the distortion including phase lag and amplitude attenuation occurs in the system sinusoid response, the amplitude and phase control (APC) algorithm, based on Adaline neural network and using LMS algorithm, is developed for distortion cancellation. The APC controller is simple and can on-line adjust, thus it gives accurate tracking.     

带观测器的最优滑动模态变结构控制在火炮直流伺服系统中的应用研究

提出基于观测器设计的大功率PWM伺服系统最优化滑动模态变结构控制方法,消除了变结构控制中存在的颤振问题,通过计算机仿真与台架试验标明了该方法的有效性。该方法结构简单、实时性强,具有一定的工程实用价值。     

Vibration reduction of the nonlinearly traveling string by a modified variable structure control with proportional and integral compensations

In recent years, the variable structure control (VSC) method is widely exploited for suppressing vibration. The reduction of vibration in an axially moving string can improve productive quality and enhance competitive ability. Our object of this paper is not only to supress vibration of the string, but also to achieve the command in a shorter time. The controllers, like VSC, fuzzy, neuro-network and so on, have not achieved all the requirements of transient and steady-state situations; nevertheless, combining the advantages of different controllers is inevitable today. In our research, it is both to propose more cost-saving controllers and to achieve not only suppressions of vibration string but decreasing time for transient and steady-state situations.     

控制器参数对四轮转向和汽车稳定性控制的影响

基于虚拟样机技术,针对四轮转向和车辆稳定性控制系统,通过协同仿真比较了车辆虚拟模型在不同的控制器参数对整车系统操纵稳定性能的影响。     

基于熵测度的几种变结构控制抖振强度比较

提出了借鉴切削力的控制目标值与实测值的互熵来衡量变结构控制抖振强度的方式,通过计算机仿真实验,针对铣削加工过程控制,给出了多种变结构控制方法控制性能的比较结果.     

The effect of off-end tip distance on the nanomanipulation based on rectangular and V-shape cantilevered AFMs

The AFM system, which is used as a nanomanipulator, includes a probe consistent of a cantilever and a tapered tip. In cantilevers, the tip can be located in different distances from the cantilever free end. This causes to change in stiffness of the cantilever and therefore changing in pushing force of the nanomanipulation. In this paper, the effect of the tip distance on the cantilever stiffness is studied using the equations of Hazel, and Neumeister and Ducker (ND), and a new equation to correct the torsional stiffness of V-shaped cantilevers (VSC) is proposed, which is based on the ND equation. Then, the effect of distance on pushing force of AFM-based nanomanipulations with rectangular cantilevered (RC) and VSC AFMs is simulated. The obtained results using proposed equation show that increasing of distance causes to non-linear increment of torsional stiffness of VSC. Error of the proposed equation is achieved less than 3% in comparison with result of torsional stiffness equation of ND. Moreover, it is observed that the torsional stiffness of VSC predicted by Hazel’s equation is considerably inaccurate. In nanomanipulation studies, the necessary pushing forces of nanoparticle motion are increased by increment of distance, for both types of cantilevers (RC and VSC). Moreover, critical time for RC AFM increases, but in the case of VSC AFM, the critical time decreases at first, then it is almost constant at a limited range of d, and finally it starts to increase by increasing the distance.     

SLIDING MODE CONTROL FOR ACTIVE AUTOMOBILE SUSPENSIONS

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Side slip angle based control threshold of vehicle stability control system

Vehicle Stability Control (VSC) system prevents vehicle from spinning or drifting out mainly by braking intervention. Although a control threshold of conventional VSC is designed by vehicle characteristics and centered on average drivers, it can be a redundancy to expert drivers in critical driving conditions. In this study, a manual adaptation of VSC is investigated by changing the control threshold. A control threshold can be determined by phase plane analysis of side slip angle and angular velocity which is established with various vehicle speeds and steering angles. Since vehicle side slip angle is impossible to be obtained by commercially available sensors, a side slip angle is designed and evaluated with test results. By using the estimated value, phase plane analysis is applied to determine control threshold. To evaluate an effect of control threshold, we applied a 23-DOF vehicle nonlinear model with a vehicle planar motion model based sliding controller. Controller gains are tuned as the control threshold changed. A VSC with various control thresholds makes VSC more flexible with respect to individual driver characteristics.