Development of Adaptive Positive Position Feedback Controller for Active Vibration Suppression of Smart Structures

2018 ◽  
Vol 28 (4) ◽  
pp. 403-409
Author(s):  
Sangbo Han
Keyword(s):  
Vibration Suppression ◽  
Smart Structures ◽  
Feedback Controller ◽  
Positive Position Feedback ◽  
Active Vibration Suppression ◽  
Position Feedback ◽  
Active Vibration

Active Vibration Control With Modified Positive Position Feedback

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
S. Nima Mahmoodi ◽  
Mehdi Ahmadian
Keyword(s):  
Steady State ◽  
Vibration Control ◽  
Vibration Suppression ◽  
Active Vibration Control ◽  
Second Order ◽  
Loop System ◽  
Control Technique ◽  
Positive Position Feedback ◽  
Position Feedback ◽  
Active Vibration

A novel active vibration control technique based on positive position feedback method is developed. This method, which is a modified version of positive position feedback, employs a first-order compensator that provides damping control and a second-order compensator for vibration suppression. In contrast, conventional positive position feedback uses a single second-order compensator. The technique is useful for strain-based sensors and can be applied to piezoelectrically controlled systems. After introducing the concept of modified positive position feedback, this paper investigates the stability of the new method for locating gain limits. Stability conditions are global and independent of the dynamical characteristics of the open-loop system. Using root locus plots, proper compensator frequency is identified and damping of the closed-loop system is studied. The performance of the modified positive position feedback for both steady-state and transient dynamic control is studied. The experimental and numerical results show that the proposed method is significantly more effective in controlling steady-state response and slightly advantageous for transient dynamics control, as compared with conventional positive position feedback.

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