Pilot-Induced Oscillations Prevention Using Anti-Windup Compensation in the Presence of Time-Delay

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.325-326.1262 ◽

2013 ◽

Vol 325-326 ◽

pp. 1262-1266

Author(s):

Valentin Pană

Keyword(s):

Control System ◽

Time Delays ◽

Design Technique ◽

Comparative Result ◽

H Infinity ◽

Reduced Order ◽

Saturating Actuators ◽

Time Simulation ◽

Compensator Design ◽

Optimization Methodology

The paper presents a compensator design technique for systems with saturating actuators in order to recover as much as possible the performance of the unsaturated case. This anti-windup scheme is obtained using H-infinity optimization methodology. The proposed design approach allows to obtain a anti-windup controller that accounts for time-delays in the control system. Comparative result are presented for the two design methods and time simulation of the nonlinear system are used to analyze the performances of both designs. A reduced order anti-windup controller procedure is also investigated. Keywords: PIO, anti-windup, rate saturation, compensator.

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A Reduced-Order Controller Considering High-Order Modal Information of High-Rise Buildings for AMD Control System with Time-Delay

Shock and Vibration ◽

10.1155/2017/7435060 ◽

2017 ◽

Vol 2017 ◽

pp. 1-16 ◽

Cited By ~ 2

Author(s):

Zuo-Hua Li ◽

Chao-Jun Chen ◽

Jun Teng ◽

Wei-Hua Hu ◽

Hou-Bing Xing ◽

...

Keyword(s):

Control System ◽

Data Acquisition ◽

Time Delays ◽

Damping Ratio ◽

High Order ◽

Original Structure ◽

Control Force ◽

Control Effect ◽

Reduced Order ◽

Force Calculation

Time-delays of control force calculation, data acquisition, and actuator response will degrade the performance of Active Mass Damper (AMD) control systems. To reduce the influence, model reduction method is used to deal with the original controlled structure. However, during the procedure, the related hierarchy information of small eigenvalues will be directly discorded. As a result, the reduced-order model ignores the information of high-order mode, which will reduce the design accuracy of an AMD control system. In this paper, a new reduced-order controller based on the improved Balanced Truncation (BT) method is designed to reduce the calculation time and to retain the abandoned high-order modal information. It includes high-order natural frequency, damping ratio, and vibration modal information of the original structure. Then, a control gain design method based on Guaranteed Cost Control (GCC) algorithm is presented to eliminate the adverse effects of data acquisition and actuator response time-delays in the design process of the reduced-order controller. To verify its effectiveness, the proposed methodology is applied to a numerical example of a ten-storey frame and an experiment of a single-span four-storey steel frame. Both numerical and experimental results demonstrate that the reduced-order controller with GCC algorithm has an excellent control effect; meanwhile it can compensate time-delays effectively.

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