Nonlinear robust control method for active vibration isolation using a Stewart platform

2009 ◽  
Author(s):  
Tao Yang ◽  
Jia Ma ◽  
Zeng-Guang Hou ◽  
Fengshui Jing ◽  
Min Tan
Keyword(s):  
Robust Control ◽  
Vibration Isolation ◽  
Control Method ◽  
Stewart Platform ◽  
Nonlinear Robust Control ◽  
Active Vibration ◽  
Nonlinear Robust ◽  
Active Vibration Isolation

A Study of Active Vibration Isolation

1985 ◽  
Vol 107 (4) ◽  
pp. 392-397 ◽  
Author(s):  
N. Tanaka ◽  
Y. Kikushima
Keyword(s):  
Vibration Isolation ◽  
Control Method ◽  
Feedforward Control ◽  
Ground Vibration ◽  
Design Parameters ◽  
Isolation Method ◽  
Isolation System ◽  
Active Isolation ◽  
Active Vibration ◽  
Active Vibration Isolation

For the purpose of suppressing ground vibration produced by vibrating machines, such as forging hammers, press machines, etc., this paper presents an active vibration isolation method. Unlike conventional isolators, the active isolator proposed in this paper permits rigid support of the machines. First, the principle of the active isolation method is shown, and the system equations are derived. Secondly, the characteristics and the design parameters of the active isolation system are presented. Thirdly, from the point of view of the feedforward control method, the dynamic compensators are designed so as to sufficiently suppress the exciting force. Finally, an experiment is carried out to demonstrate that the active isolator is applicable for suppressing the ground vibration.

A novel multivariable nonlinear robust control design for turbofan engines

2021 ◽  
pp. 014233122110396
Author(s):  
Dingding Cheng ◽  
Lijun Liu ◽  
Zhen Yu
Keyword(s):  
Robust Control ◽  
Closed Loop ◽  
Control Method ◽  
Operating Conditions ◽  
Large Region ◽  
Control Performance ◽  
Nonlinear Robust Control ◽  
Turbofan Engines ◽  
Robust Control Design ◽  
Nonlinear Robust

Traditional steady-state control methods are applied to turbofan engines operating in the small region near certain operating conditions, which need to switch controllers for operating in the large region and then may lead to instability and performance degradation of the closed-loop system. In this paper, a novel multivariable nonlinear robust control method for turbofan engines is proposed to improve the control performance within the large region. To enlarge the controllable region, a polynomial state-space model describes the nonlinear characteristics of turbofan engines. Based on the analysis of the closed-loop control system, by using the Lyapunov function theorems, a polynomial robust controller is designed to ensure the stability and desired nonlinear control performance of turbofan engines. Compared with the classical PI, mixed sensitivity, and H∞ control, simulation results show that the proposed method has better transient responses, disturbance rejection, and other control performance for the turbofan engine within the large region.

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