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Working principle of distributed optical fiber temperature sensor (DTS) system is introduced briefly in his paper. And factors affecting stability of DTS system are discussed. Electromagnetic interference and environmental temperature are important factors to stability of the DTS system. Metal shield is used to reduce electromagnetic interference. Temperature compensation circuit and sampling correction...
In this paper, the finite-time stable control problem for the chaotic system of permanent magnet synchronous motor is studied. An active control method with dynamic active compensation is proposed, which makes the closed-loop system achieve approximately finite-time stable control. And a new observer is designed to solve the uncertainty. The approximate finite-time stability of the closed-loop system...
In this paper, a new cooperative control system is proposed for the vehicle's steering antilock braking stability fields. The cooperative control architecture is composed with the steering controller and the braking controller. Based on the yaw moment and the front wheel angle controllers, the vehicle steering controller was designed to improve the respond and stability of the vehicle. Besides, the...
Coal ball mill pulverizing system is a multiple-input multiple-output (MIMO) system characterized with strong couplings and disturbances. In the coal ball mill control system, the three loops possess different dynamics with remarkable lag times. In this paper, we proposed a mixed control scheme based on loop priority (namely the outlet temperature loop, the inlet pressure loop, the pressure difference...
This paper describes lead/lag compensators tuning method based on gain and phase margin specifications for two kinds of unstable processes. A simple and effective graphic method is used to solve a set of nonlinear coupled equations. The solutions are determined from the intersections of the two kinds of curves constructed from gain and phase margin specifications. The results are applied to the tuning...
In order to control the cutting chatter in machining of thin-walled workpieces, the dynamic milling model of thin-walled workpieces is analyzed and built based on the analysis of degrees in two perpendicular directions of tool-workpiece system. In high speed milling of 2A12 aluminum alloy, the compensation method based on the modification of inertia effect was proposed and accurate cutting force coefficients...
Considering the characteristics of the time-delay, inertia and time-varying of the dissolved oxygen (DO) control in the sewage disposal process, a Fuzzy Smith-PID control model is proposed based on the analysis of the regular PID and Fuzzy control in this paper, which integrates the advantages of the high robustness of the Fuzzy controller, the compensation of the time delay problem of Smith Estimation...
According to the characteristics of long time-delays, large inertia and time-variation in the dissolved oxygen control method of sewage treatment, one fuzzy-Smith control model on dissolved oxygen control is presented in this paper. This model has the merits of a high robustness in fuzzy controller and a compensation for time delay in Smith predictor. After simulation experiment, the result is shown...
The Fresnel lens optical landing system (FLOLS) is the electro-optical pilot longitudinal landing aid for the carrier. The guiding principle and the stabilization theory of the FLOLS are analyzed here. The line stabilization strategy is analyzed, in order to build the line stabilization model, the transformation problem of the carrier rotational motion between different coordinate systems is solved,...
This paper investigates the design problem of robust fault-tolerant control (FTC) by using online control re-allocation for a class of uncertain systems and its application to flight tracking control. The design procedure consists of two parts: robust fault-tolerant baseline controller design, and realization of a control re-allocation scheme. The baseline controller is obtained by an iterative LMI...
A discrete time neural network adaptive inversion controller design for a supermaneuverable aircraft nonlinear model is presented. The singular perturbation theory is used to separate the nonlinear dynamics into fast and slow sub-systems; The dynamic inversion is applied to design the control laws for the two sub-systems separately; The neural network adaptive control is based on the dynamic inversion,...
This paper presents a stochastic control method for networked control systems (NCSs) with time-varying sampling periods and random delay. The random delay of the NCS is modelled as intervals governed by a Markov chain. With the switching of the sampling periods, a discrete-time Markovian jump system with parameter uncertainties is presented to model the NCS. By introducing a delay-compensating control...
A control scheme of ANN-based PID controller is developed here to reach high precision tracking control for an electro-hydraulic servo system. The PID controller is used as a feedback controller to guarantee the system stability. The cerebellar model articulation controller (CMAC) neural network is used as a feed-forward compensator to identify the inverse system dynamics model. The CMAC and the PID...
Piezoelectric actuators are widely applied as actuators in micro/nano-positioning systems, due to its characteristic of infinitely small displacement resolution. At the same time, piezoelectricity material has nonlinear hysteretic phenomena, it will induce low position precision and it also results in closed-loop controlling system instable. This paper presents a new approach for modeling hysteretic...
This paper deals with networked control systems with random long time-delay problem. According to the actual time-delay, we design a discrete model of networked control systems and propose a fuzzy controller based on parallel distributing compensation theory. The method to design membership function is also presented. Lyapunov theory and linear matrix inequality are used to derive the sufficient conditions...
Giant magnetostrictive material (GMM) is gathering more interests due to its superior electromechanical properties. Though the strain of GMM is almost larger than PZT, it still needs to be amplified to match practical demands. A press-bend amplification based giant magnetostrictive actuator (GMA) is designed and the electromechanical system model is presented. The dynamic model consists of two subsystems,...
With the definition and investigation of the general fuzzy partition (GFP), the structural information of the premises and the interactions among the fuzzy subsystems were utilized sufficiently. The new relaxed stability conditions of T-S fuzzy systems were proposed for relaxing the conservatism of the previous ones. A theorem showed the relationships among the stability conditions we proposed. Based...
A new design algorithm of three degree of freedom (3DOF) internal model control (IMC) for unstable process is presented in this paper. A robust compensator is introduced into the system to improve the robustness and the compensator in feedback loop not only can be used to stabilize the unstable process, but also for disturbance rejection. Followed the presented criterion for robust stability, the...
The heater of injection molding machine's cylinder is composed of several zones which spread along the cylinder's axis. There are strong coupling effects among the zones. To avoid computing-intensive decoupling matrices, we treat every zone as an independent nonlinear time-varying second-order system and compensate them with a proposed self-turning PID controller separately. Due to the self-turning...
In this paper, a kind of direct fuzzy adaptive controller with Hinfin compensation is applied to robot manipulators with uncertainty in Cartesian space. The direct fuzzy adaptive controller is derived from fuzzy logic system as the master one, and the additional Hinfin compensation controller is employed to attenuate both the effects of fuzzy approximation error and external disturbance. In addition,...
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