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This paper presents the control design and test results of the high speed position control of a spherical pendulum system. Altogether three oscillatory modes are considered: two swing modes and a torsion mode. A sequence of input shapers including the Zero Vibration and Zero Vibration-Derivative shapers are implemented in the robot controller to minimize command induced cable swing. Experiment data...
A filter for trajectories smoothing is presented. The filter provides an output reproducing the input trajectory if this is compliant with given constraints on the velocity, the acceleration and the torque required for tracking it. Otherwise, the filter approximates the input profile guaranteeing that the output trajectory satisfies all the kinematic and dynamic limits. The tracking of the input signal...
The design of a Second Order Sliding Mode controller to perform the motion control of a robot manipulator in presence of obstacles is discussed in this paper. A possible solution to the problem of planning a trajectory for the manipulator is first proposed. The obstacles are represented by discs in the robot workspace. The proposed solution consists in an analytical mapping of the discs, representing...
This paper presents a robust nonlinear generalized predictive control (RNGPC) strategy applied to a permanent magnet synchronous motor (PMSM) for speed trajectory tracking and disturbance rejection. The nonlinear predictive control law is derived by using a newly defined design cost function. The Taylor series expansion is used to carry out the prediction in a finite horizon. No information about...
In this paper a robust integrated design methodology for dynamic systems is formulated. The proposed methodology can be applied to design both the system and the control parameters, thus allowing for an optimization based integrated system and controller design under uncertainties or unknown parameters. This design methodology is used to simultaneously design the links of a five revolute two degree...
The development of discrete sliding mode control for three-phase PWM converters with LCL filter is presented. This robust control method is investigated for the current control loop. Done in a discrete state space system, a feedforward feedback structure is utilized. A reference state trajectory and feedforward control in αβ coordinates, discrete integral SMC in dq coordinates are designed and analysed...
A neuro-fuzzy learning algorithm is applied to design a Takagi-Sugeno type Fuzzy Logic Controller (T-S FLC) for a biped robot walking problem. The control design considers an output function imposed on the feedback and several TS-FLC models are determined each by ANFIS, which represent a piece-wise control inputs that together to perform a walking cycle. Two simulations of the closed-loop system for...
Utilizing the notion of Filippov solution, a sliding mode control law is derived for generic second order nonlinear mechanical system with friction. The control law is designed with some tunable parameters and optional functions. The asymptotically stability of the closed-loop system is proved by the concept of the solution, nonsmooth analysis and nonsmooth Lyapunov stability theory. By some numerical...
Iterative learning control (ILC) is a technique to make use of the repetitiveness of the tasks, a system is commanded to execute in a fixed finite time interval. In this paper, we assume that the system to be controlled is discrete time and described by linear state space equations. We present a proportional, integral, derivative (PID) type ILC updating law with variable coefficients. An optimal procedure...
A difference between the human and robots from the viewpoint of motor control is a sampling time in everyday movements. That is, the sampling time for controlling conventional robot systems is required to become approximately 1 ms. On the other hand, the motor control based on human nervous system permits considerably large time-delay due to the transmission latency on afferent/efferent pathways of...
Ionic polymer-metal composite (IPMC) actuators have many advantages; for instance, they (1) can be driven with low voltages (<;5 V); (2) are soft, flexible and easily shaped; and (3) can operate in an aqueous environment (such as water). Important applications for IPMCs include active catheter devices for minimally invasive surgery, artificial muscle, and sensors and actuators for biorobotics....
This paper considers the stabilization of random Boolean networks. We first give a survey on the semi-tensor product approach to Boolean (control) networks, which is a new technique developed by us. Particularly, the stability and stabilization of Boolean (control) networks are reviewed. Then, under the same framework, the topological structure of the random Boolean networks is investigated and revealed...
This paper presents the elaboration of a comprehensive Matlab-Simulink™ virtual environment of a Stewart platform. This simulation tool includes the kinematic and dynamic modeling of the platform, along with the control loops of the actuators and coupled to a trajectory generation module, it also offers complete visualization features through a dedicated graphic user interface. This simulator was...
This paper presents a comparative assessment of feed-forward schemes in hybrid control schemes for anti-swaying and trajectory tracking of a double-pendulum-type overhead crane (DPTOC) system. A nonlinear DPTOC system is considered and the dynamic model of the system is derived using the Euler-Lagrange formulation. To study the effectiveness of the controllers, initially nominal characteristics following...
Using aerodynamic force to finish the orbital transfer mission can save a lot of fuels and increase the payload. In this paper, After giving the mathematical description of the Aero-assisted Orbital Transfer(AOT) problem, we discrete it through the Guess-pseudospectral method and then apply SNOPT algorithm to get the optimal state trajectory. After that we do some simplify to original dynamic equations...
Precision positioning performance is degraded by nonlinear effects of dynamic error and flexibility with harmonic drive systems. To compensate for dynamic error in the presence of nonlinear flexibility in high precision tracking, the nonlinear dynamic equation with dynamic error of harmonic drive is established by Lagrange method. Then, it is inverted to the state equation for control design. The...
A Gauss pseudospectral method (GPM) is presented for directly solving impulsive orbit transfer problem. The Gauss pseudospectral method is applied to the multi-phase optimal control problem; the model of multi-phase control linkage conditions and more flexible solving strategy are also presented. Two typical orbit transfer problems are studied, the simulation results are compared with the available...
A new design method is developed based on the new criteria on approaching phase of sliding mode control. The linear Lipschitz surface can be designed to be switching condition of sliding mode control such that the sliding motion along the surface is not smooth any longer as usual sliding mode controller. Thus, the flexible performance of the sliding motion can be achieved according to the region of...
The robust stabilization of switched systems with nonlinear disturbance and its application are studied, and the sliding mode control theory is applied to the controller synthesis. The reduced-order sliding mode dynamics and a sufficient condition of its stability are given by introduce a linear transformation. Moreover, the switching law is chosen and a sliding mode control law is synthesized based...
Ball and plate system is a high-order, uncertainty, nonlinear systems. Aiming at this system, a cascade control strategy with low-order active disturbance rejection controller (ADRC) is proposed in this paper. After the nonlinear system is converted into cascade system of several low-order nonlinear subsystems, the controller can be designed. This strategy solves the difficulties of structure design...
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