The Control Law Research on a Semi-active Damping Variable Mount System

2009 ◽  
Author(s):  
Wen-bing Yan ◽  
Yu-jun Cai ◽  
Shao-zhong Jiang
Keyword(s):  
Active Damping ◽  
Control Law

Vibration Control Using Combined Independent Modal Space Control and Fuzzy Logic

1995 ◽  
Author(s):  
Mehran Asdigha ◽  
Robert Greif
Keyword(s):  
Physical Space ◽  
Fuzzy Rule ◽  
Fuzzy Reasoning ◽  
Performance Criterion ◽  
Active Damping ◽  
Rule Base ◽  
Control Law ◽  
Traditional Algorithm ◽  
Control Forces ◽  
Modal Space

Abstract Independent Modal Space Control (IMSC) is an established technique in active suppression of vibrations, in which the control law is developed exclusively in the modal space, allowing for independent design of the modal control forces. These forces can be transformed to the physical domain through modal transformation. The resulting controller is fixed-gain, with the active damping introduced to the system determined independently for each mode and is a function of the velocity for the under-damped case. In this work we propose to modify IMSC using fuzzy reasoning. The result is a new non-linear control law, embedding fuzzy reasoning and an implicit fuzzy rule-base that transforms the traditional algorithm from a fixed-gain to a variable-gain controller. The algorithm uses information about the displacement profile across the sensed locations to distribute the active damping rationally among the modal controllers. This new algorithm complements the “local” view of the traditional algorithm in the modal space, with a “global” view of the displacements in the physical space. The results show significant improvement in the settling time as the performance criterion.

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