共查询到20条相似文献，搜索用时 390 毫秒
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本文通过运用柔性臂动力学及控制理论,对柔性臂与控制系统的参数耦合进行分析,并构建了柔性臂的动力学方程及传递函数模型,利用Ritz法求系统的振型函数与频率,最后建立了柔性臂状态空间耦合模型,得出机械结构与控制系统之间的相互耦合性是比较强的,我们应当对机械结构与控制系统进行耦合建模与一体化设计,从而满足当今对机电系统的高性能要求。 相似文献
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针对模块化机械臂动力学中存在的参数不确定性及外界干扰,在参考输入受噪声影响的情况下,提出了一种离散时间模块化机械臂关节空间分布式控制策略。利用跟踪微分器获得了高质量的角位移信号及其微分信号,利用扩张状态观测器来补偿机械臂不确定非线性动力学以及外部干扰,并采用非线性状态误差反馈形成控制作用,在关节空间设计强鲁棒性的自抗扰控制器实现机械臂关节空间的轨迹跟踪控制。由于对每个关节单独设计了控制器,因此控制器结构简单,易于实现,仿真结果进一步验证了所提方案优于传统控制方法。 相似文献
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本文以直流力矩电机为执行元件,LMD18200为电机驱动器件,增量式光电旋转编码盘作为位置检测元件,DSP TMS320F2811为控制器组建了单节机械臂控制系统的硬件。提出了适用于本系统的力矩控制方式,采用前馈加反馈的控制策略实现对机械臂的位置控制。论文对系统的非线性和惯性问题进行了研究。针对机械产生的非线性和机械臂转动时的惯性问题提出了改进方案和补偿的方法,并应用到了系统实际设计中。 相似文献
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污水的处理是一个滞后性突出、非线性强、随机性和多变性显著的工作,PID控制系统在传统的曝气控制中虽然取得了优异的成绩,但是其中问题还较为明显。本文针对某污水处理厂鼓风机房、生化池过程研究,分析了一般污水处理厂的处理工艺流程,并且根据其中曝气过程特点阐述了PLC控制下的电气控制方案,旨在提高曝气系统准确性和科学性。 相似文献
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本文比较了现有三坐标测量机的优缺点,介绍了关节臂式柔性三坐标测量系统的主要结构,系统分析了关节臂式柔性三坐标测量系统测量精度的影响因素和解决方法.为关节臂式柔性三坐标测量系统在装备维修零件检测的应用奠定了一定的基础. 相似文献
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混沌理论在数字图书馆中的应用研究 总被引：4，自引：0，他引：4
混沌和混沌控制是非线性动力系统的新理论，是非线性科学应用的新研究领域，本文介绍了混沌的定义、特点、性质，并对混沌在数字图书馆版权保护和信息安全中的应用进行了研究。 相似文献
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This paper deals with the simultaneous coordinated design of power system stabilizer (PSS) and the flexible ac transmission systems (FACTS) controller. The problem of guaranteed cost reliable control with regional pole constraint against actuator failures is investigated. The state feedback controllers are designed to guarantee the closed loop system satisfying the desired pole region, thus achieving satisfactory oscillation damping and settling time, and having the guaranteed cost performance simultaneously. The proposed controllers satisfy desired dynamic characteristics even in faults cases. The controller's parameters are obtained using the linear matrix inequalities (LMI) optimization. Simulation results validate the effectiveness of this approach. 相似文献
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针对一个基于网络的二自由度机械臂的远程控制系统，通过对影响系统性能的延时因素的分析，提出了离线与在线的延时补偿方案，弥补了远程控制在任务完成时间上与本地控制相比所存在的延时；并通过实际系统的远程操控实验进一步证实了理论分析的正确性与控制策略的有效性。 相似文献
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This paper presents the analysis and control of active magnetic bearing (AMB) systems with a flexible rotor. A sliding mode controller design scheme is proposed to compensate for the nonlinear effects of the AMB system. A nonlinear model of the AMB system with an electromagnetic actuator and a flexible rotor is proposed to facilitate the present system analysis and controller design. This nonlinear model takes into account the dynamics of the flexible rotor, the characteristics of the nonlinear electromagnetic suspended system, and the contact force between the auxiliary bearing and the shaft. This study also considers the auto-centering control of the AMB system when subjected to disturbances and variations in the system parameters. The numerical results show that the system exhibits a periodic motion and demonstrates high accuracy and robustness when operating under sliding mode control. 相似文献
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《Journal of The Franklin Institute》2021,358(18):9561-9586
In this paper a novel adaptive robust fault-tolerant sync control method is proposed for a two-slider system where two sliders are constrained by a flexible beam. At first the dynamic models of sync motion system subject to external disturbances and actuator faults are derived. In order to avoid the shortcomings of truncated model, the model of flexible beam is described by using infinite dimensional equation. Then based on the models a novel disturbance observer and an adaptive fault-tolerant control law are designed. The disturbance observer is used to estimate and cancel external disturbances. The adaptive fault-tolerant control is used to deal with the partial loss of effectiveness faults. Lyapunov functional approach is used to prove that the closed-loop system with the proposed control laws is uniformly bounded stable. Finally, some simulation results display that the proposed control laws can obtain excellent sync performance in the present of external disturbances and actuator partial loss of effectiveness faults. 相似文献
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《Journal of The Franklin Institute》2018,355(18):9209-9223
This paper investigates the robust attitude tracking control problem for a rigid-flexible coupling spacecraft. First, the dynamic model for a rigid-flexible coupling spacecraft is established based on the first-order approximation method to fully reveal the coupling effect between rigid movement and flexible displacement when the spacecraft is in rapid maneuver. In the condition that flexible vibration measurements are not available, an robust output feedback controller which is independent of model is presented using Lyapunov method with considering state-independent disturbances. To resolve the chattering problem caused by the discontinuous sign function, a modified continuous output feedback controller is proposed by introducing functions with continuous property. Rigorous proof is achieved showing that the proposed control law ensures asymptotic stability and guarantees the attitude of a rigid-flexible spacecraft to track a time-varying reference attitude based on angle and angular velocity measurements only. Finally, simulations are carried out to verify the simplicity and effectiveness of the proposed control scheme. 相似文献
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To perform repetitive tasks, this paper proposes an adaptive boundary iterative learning control (ILC) scheme for a two-link rigid–flexible manipulator with parametric uncertainties. Using Hamilton?s principle, the coupled ordinary differential equation and partial differential equation (ODE–PDE) dynamic model of the system is established. In order to drive the joints to follow desired trajectory and eliminate deformation of flexible beam simultaneously, boundary control strategy is added based on the conventional joints torque control. The adaptive iterative learning algorithm for boundary control scheme includes a proportional-derivative (PD) feedback structure and an iterative term. This novel controller is designed to deal with the unmodeled dynamics and other unknown external disturbances. Numerical simulations are provided to verify the performance of proposed controller in MATLAB. 相似文献
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《Journal of The Franklin Institute》2023,360(13):10127-10164
This paper investigates a difficult problem of nonlinear dynamics and motion control of a dual-flexible servo system with an underactuated hand (DFSS-UH). Variation in grasping mass and nonlinear factors of the DFSS-UH including complex flexible deformation and friction torque aggravate the output speed fluctuation, leading to modeling errors in the dynamics, which in turn affects the underactuated hand motion accuracy. A novel neural network sliding mode control (NNSMC) method is designed to control the DFSS-UH. The strategy utilizes neural networks to compensate for dynamics modeling errors, which takes into account neglected nonlinear factors and inaccurate friction torque. The reaching law with the hyperbolic tangent function is proposed to improve sliding mode control, thereby weakening the chattering phenomenon. First of all, the DFSS-UH mechanical model considering many nonlinear factors is established and a dynamic simplification model which ignores higher-order modes is proposed. Secondly, the adaptive law of weighted coefficients is proposed according to the stability of the DFSS-UH. Finally, the physical control platform of the DFSS-UH is built, and simulation and control experiments are conducted. Experimental results show that the improved NNSMC strategy decreases the tracking error of flexible load, thereby enhancing the control accuracy of the DFSS-UH. 相似文献
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The inverse solution calculation speed and the configuration control are very important for anthropomorphic manipulators with 7 degree-of-freedom (DOF). In order to realize the combined control of global arm configuration manifolds and local self-motion of 7-DOF anthropomorphic manipulators without offset, an analytical inverse kinematics solution method is proposed in this paper. By defining a new arm reference plane for 7-DOF anthropomorphic manipulators, it uses arm angle to deal with local self-motion and orientation control to deal with global arm configuration manifolds. All possible inverse kinematics solutions for target pose can be intuitively expressed with the assistance of the parameters of arm angle and orientation control. Meanwhile, the corresponding singularity is also taken into account and a detection metric is provided. Furthermore, the problem of joint limits avoidance is mapped to the selection of arm angle in null space, and the Self-Adaptive Particle Swarm Optimization algorithm is introduced to obtain the optimal arm angle that can maximize the avoidance of joint limits. Simulation results show the proposed method has such advantages as fast calculation speed, high precision and high stability. 相似文献
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This paper studied an adaptive actuator fault-tolerant control scheme for the flexible Euler–Bernoulli beam in the three-dimensional space with output constraints and uncertain end load. The dynamic models are represented by partial differential equations (PDEs) and ordinary differential equations (ODEs). When part of the actuator fails, an adaptive control scheme is designed to regulate the vibration and stabilize the flexible three-dimensional Euler–Bernoulli beam. Barrier Lyapunov Function (BLF) is adopted to realize output constraints of the system. Adaptive control law with projection mapping operator is designed to compensate for the end load which is uncertain and bounded. The goal of this paper is to suppress the displacement of the flexible three-dimensional Euler–Bernoulli beam which can be constrained in given bounds under actuator fault and uncertain, bounded end load. It is confirmed that the proposed control scheme can deal with the vibration, adaptive actuator fault-tolerant control, uncertain and bounded end load and output constraints of the system simultaneously. Finally, numerical simulations illustrate the effectiveness and feasibility of the method. 相似文献