直流无刷电机的模糊滑模变结构控制

直流无刷电机的位置控制回路的特性由于其参数会随着输入信号的不同而发生变化,传统的PID控制就不能很好地适应此电机系统。本文提出用滑模变结构控制结合模糊控制法则来对电机的位置进行控制,仿真表明在受到扰动和当电机参数不是非常清晰的情况下仍能有较强的适应性。     

ABS的模糊滑模变结构控制方法及仿真研究

分析了车辆防抱死制动系统的滑模变结构控制，提出了防抱死制动系统的模糊滑模变结构控制方法，根据滑模切换函数及其导数对滑模控制量进行模糊划分，形成二维模糊控制规则表。对切换函数及其导数采用动态模糊划分，以提高系统控制的敏感度。对单轮系统车辆的仿真表明，模糊滑模变结构控制方法既能缩短响应时间，也能抑制系统颤振。     

交流伺服系统自适应模糊滑模控制

介绍了交流伺服系统的自适应模糊滑模控制方案.通过自适应模糊控制解决了扰动补偿问题.正是因为结合了模糊控制的逼近特性和滑模控制的鲁棒性,才使得系统对外部扰动具有很好的稳定性和鲁棒性,同时消除了抖动现象.仿真实验表明这一控制方案具有很好的控制效果.     

模糊滑模变结构控制在混合输入平面五杆机构中的应用

在分析混合输入平面五杆机构动力学模型的基础上，以滑模变结构理论为基础，应用模糊控制法则，设计出模糊滑模变结构控制器，利用Simulink对系统响应进行计算机仿真，并将仿真结果与用传统的PID控制器的结果进行了比较。研究表明，模糊滑模变结构控制器能够更好地保证系统跟踪的稳定性，使其有良好的稳健性和稳态响应。     

模糊滑模变结构控制在DCT电控离合器的应用

针对离合器系统的强非线性、难以建立精确的数学模型等特点,设计了滑模变结构控制器,利用模糊控制器来调整滑模趋近律参数的方法来消弱系统抖振动现象,建立了无刷直流电机的数学模型。用MAT—LAB软件进行了仿真验证,并和传统PID控制器作比较。仿真结果表明,该控制器跟踪指令信号性能良好,且具有较强的稳定性。     

两自由度FTS的模糊滑模变结构控制

本文描述了一种新型两自由度FTS的控制方法。根据已有两自由度FTS的动力学数学模型,设计了模糊滑模变结构控制方法对两自由度FTS进行运动控制。文章中详细介绍了模糊滑模变结构控制算法中滑模面的设计和切换函数的设计。分析了针对传统滑模变结构控制的抖振问题而引入模糊控制方法构建滑模变结构控制切换函数的优点。最后,利用仿真软件对所设计的模糊滑模变结构控制方法在两自由度FTS控制中的应用进行了仿真,结果表明本文设计的控制算法较好的实现了控制目标。     

永磁同步电机的模糊滑模控制

为了实现高性能永磁同步电动机伺服系统快速而精确的位置跟踪控制,在滑模控制策略中引入模糊控制算法,设计了基于模糊规则的滑模控制器;并通过理论分析和控制仿真,证实了模糊滑模控制很好地解决了抖振问题,对参数变化和负载扰动具有很好的鲁棒性,永磁同步电机可获得很好的位置跟踪效果。     

电液位置伺服系统的模糊滑模控制研究

针对电液位置伺服系统的位置跟踪控制问题,在滑模控制理论的基础上,加入模糊控制理论,提出了一种模糊自学习滑模控制方案.通过设计模糊控制器,用模糊输出代替滑模切换控制,将该控制方法应用于电液位置伺服系统的研究中,仿真实验结果表明该控制方案的有效性,跟踪性能良好,能有效削弱抖振.     

粒子群优化变论域模糊PID控制在风电机组变桨距中的应用

风力发电机变桨距系统采用传统PID控制,不仅超调大、调节时间长、精度低,而且在超过额定风速时,风电机组的输出功率波动比较剧烈,误差较大。该文采用粒子群优化算法改进变论域模糊PID控制器,仿真结果表明:粒子群优化变论域的模糊PID控制器具有良好的动态性能及对风速扰动的鲁捧性,可以平稳地输出功率。     

模拟转台伺服系统的自适应模糊滑模控制研究

利用Stribeck摩擦模型,将自适应控制与模糊滑模控制相结合,提出了自适应模糊滑模控制模型,对模拟转台伺服系统进行了控制。仿真结果表明,自适应模糊滑模控制器能有效抑制摩擦力矩的影响,实现高精度的位置跟踪,鲁棒性好,值得在其他非线性系统中推广使用。     

Adaptive fuzzy sliding mode control for electric power steering system

The Electric power steering (EPS) system, a typical non-linear system, is easy to be influenced by parameters perturbation and disturbance of the road. Traditional linear control method based on a simplified linear model such as PID control cannot reach good dynamic performance. To reduce the influence of parameters perturbation and disturbance of the road and enhance the robustness of the system, an Adaptive fuzzy sliding mode control (AFSMC) method is proposed in this paper. First, fuzzy sliding mode control is employed to enhance the dynamic performance of the system. Then, to improve the precision of the controller, genetic algorithm is used to optimize the control rules which are essential to fuzzy control. The experimental results on non-linear EPS model demonstrate that AFSMC is more stable than Sliding mode control (SMC) method and more efficient to the non-linear system than SFPID control method. They can also prove that AFSMC can provide a stable driving in the presence of parameters perturbation and disturbance of the road.     

Direct power control of DFIG wind turbine systems based on an intelligent proportional-integral sliding mode control

This paper presents an intelligent proportional-integral sliding mode control (iPISMC) for direct power control of variable speed-constant frequency wind turbine system. This approach deals with optimal power production (in the maximum power point tracking sense) under several disturbance factors such as turbulent wind. This controller is made of two sub-components: (i) an intelligent proportional-integral module for online disturbance compensation and (ii) a sliding mode module for circumventing disturbance estimation errors. This iPISMC method has been tested on FAST/Simulink platform of a 5 MW wind turbine system. The obtained results demonstrate that the proposed iPISMC method outperforms the classical PI and intelligent proportional-integral control (iPI) in terms of both active power and response time.     

A new structure of sliding mode observer in dynamic sliding mode control of generator torque wind turbine

Journal of Mechanical Science and Technology - To extract the maximum power of wind in variable speed wind turbine (WT), a smooth signal should be implemented to the generator torque. However, the...     

挖掘机器人的模型与自适应模糊滑模控制

为实现挖掘机器人的自动挖掘,在挖掘机器人的轨迹规划器给出铲斗期望运动轨迹的情况下,需要挖掘机器人的控制系统能够控制其工作装置实现对给定轨迹的准确跟踪.利用拉格朗日方法建立了挖掘机器人工作装置的三自由度动力学方程,设计了自适应模糊滑模变结构控制器.利用模糊控制动态调节切换增益,将滑模控制的切换项转化为连续的模糊系统,增强了控制系统对挖掘机器人工作装置不确定性和外界干扰的鲁棒性,削弱了滑模控制的抖振现象,并且有较强的自适应跟踪能力.利用MATLAB7.4/Simulink工具箱对所设计的控制器进行了仿真,给出了自适应模糊滑模控制的跟踪性能及误差.     

并联机器人的智能模糊滑模控制算法

针对以交流伺服电机驱动的二自由度并联机器人,设计了智能模糊滑模控制算法.该方法先设计动态滑模面,使系统的任意初始状态一开始就在滑模面上,消除了滑模控制的到达运动阶段,使系统在响应的全过程都具有鲁棒性;然后设计一种智能模糊控制器,用模糊控制器的输出取代滑模控制切换项的输出.仿真结果表明,该控制方法不仅增强了全局抗干扰能力,而且有效地消除了系统的抖振现象.     

Variable speed wind turbine control by discrete-time sliding mode approach

The aim of this paper is to propose a new design variable speed wind turbine control by discrete-time sliding mode approach. This methodology is designed for linear saturated system. The saturation constraint is reported on inputs vector. To this end, the back stepping design procedure is followed to construct a suitable sliding manifold that guarantees the attainment of a stabilization control objective. It is well known that the mechanisms are investigated in term of the most proposed assumptions to deal with the damping, shaft stiffness and inertia effect of the gear. The objectives are to synthesize robust controllers that maximize the energy extracted from wind, while reducing mechanical loads and rotor speed tracking combined with an electromagnetic torque. Simulation results of the proposed scheme are presented.     

Composite fuzzy sliding mode control of nonlinear singularly perturbed systems

This paper deals with the robust asymptotic stabilization for a class of nonlinear singularly perturbed systems using the fuzzy sliding mode control technique. In the proposed approach the original system is decomposed into two subsystems as slow and fast models by the singularly perturbed method. The composite fuzzy sliding mode controller is designed for stabilizing the full order system by combining separately designed slow and fast fuzzy sliding mode controllers. The two-time scale design approach minimizes the effect of boundary layer system on the full order system. A stability analysis allows us to provide sufficient conditions for the asymptotic stability of the full order closed-loop system. The simulation results show improved system performance of the proposed controller as compared to existing methods. The experimentation results validate the effectiveness of the proposed controller.     

转台伺服摩擦系统模糊滑模控制仿真

滑模控制是一种非线性控制策略,能够根据当前状态实现自适应的变结构运动,能够实现伺服系统的快速响应,并克服低速状态下摩擦力矩的影响。鉴于常规滑模控制有严重的抖振现象,系统通过引入柔性的模糊控制,通过模糊控制算法改变其切换增益,实现不确定项的消除。以直流电动伺服系统为被控对象,建立了其数学模型和摩擦模型,实现了基于切换增益的模糊滑模控制器的设计,软件仿真结果表明论文所设计的滑模控制器能达到较好的控制品质,有效的克服系统抖振,实现系统低速摩擦补偿。     

Adaptive fuzzy sliding mode control for an automatic arc welding system

This paper describes an automatic welding control system developed for alternating current shielded metal arc welding (SMAW). This method could replace manual operations which require a well-trained technician. We have derived a mathematical model of the welding control system and identified the system’s parameters. The sliding surface is used as the input variable to reduce the number of fuzzy reasoning rules, in comparison with the conventional two-dimensional fuzzy logic control (FLC) algorithm. An adaptive fuzzy sliding mode controller (AFSMC) consists of an equivalent control part and a hitting control part. An adaptive law derived from a Lyapunov function is used to obtain the FLC’s parameters, and is applied to approximate the equivalent control part of the sliding mode control (SMC), so that the system states can be forced to zero. By using three-rules FLC, the control part that satisfies the hitting conditions of the SMC can force the system’s states to reach and remain on the sliding surface. Therefore, the stability of the AFSMC can be guaranteed and can be used to modulate the rate of the electrode feeding mechanism that regulates the arc current of the SMAW. The simulation and the experimental results both show that this automatic welding control system, based on the AFSMC, can perform effectively.     

Adaptive fuzzy sliding mode control for an automatic arc welding system

This paper describes an automatic welding control system developed for alternating current shielded metal arc welding (SMAW). This method could replace manual operations which require a well-trained technician. We have derived a mathematical model of the welding control system and identified the system’s parameters. The sliding surface is used as the input variable to reduce the number of fuzzy reasoning rules, in comparison with the conventional two-dimensional fuzzy logic control (FLC) algorithm. An adaptive fuzzy sliding mode controller (AFSMC) consists of an equivalent control part and a hitting control part. An adaptive law derived from a Lyapunov function is used to obtain the FLC’s parameters, and is applied to approximate the equivalent control part of the sliding mode control (SMC), so that the system states can be forced to zero. By using three-rules FLC, the control part that satisfies the hitting conditions of the SMC can force the system’s states to reach and remain on the sliding surface. Therefore, the stability of the AFSMC can be guaranteed and can be used to modulate the rate of the electrode feeding mechanism that regulates the arc current of the SMAW. The simulation and the experimental results both show that this automatic welding control system, based on the AFSMC, can perform effectively.