Improving Stability Margins via Time-Delayed Vibration Control

2017 ◽  
pp. 235-247 ◽  
Author(s):  
A. Galip Ulsoy
Keyword(s):  
Vibration Control ◽  
Stability Margins

scholarly journals Inertial Actuator with Virtual Mass for Active Vibration Control

2020 ◽  
Vol 25 (3) ◽  
pp. 445-452
Author(s):  
Qibo Mao ◽  
Shenquan Li ◽  
Shizuo Huang
Keyword(s):  
Control System ◽  
Vibration Control ◽  
Natural Frequency ◽  
Proof Mass ◽  
Active Vibration Control ◽  
Low Frequency ◽  
Virtual Mass ◽  
Stability Margins ◽  
Control Units ◽  
Acceleration Feedback

Inertial actuators (IAs) are often used as control units in active noise and vibration control systems. It is well-known that the IA's natural frequency should be far below that of the structure under control to ensure good stability margins. However, under normal circumstances, an IA with low natural frequency either increases the additional weight or causes unwanted static displacement of the IA's proof-mass. In this study, an IA with virtual mass is presented to reduce the IA's natural frequency without changing its physical design. The virtual mass of the IA is realized by using the proof-mass acceleration feedback as a local loop within the IA. Thus, the IA's natural frequency can be shifted to low frequency for active control application. The proposed IA with virtual mass is then applied to actively control a clamped beam's vibration based on the velocity feedback control system. The experimental results show that the stability of the control system and the control performance can be improved significantly as the IA's natural frequency is reduced with virtual mass.

Modeling and Evaluation of Magnetorheological Dampers with Fluid Leakage for Cable Vibration Control

2021 ◽  
Vol 26 (2) ◽  
pp. 04020119
Author(s):  
Peng Zhou ◽  
Min Liu ◽  
Weiming Kong ◽  
Yingmei Xu ◽  
Hui Li
Keyword(s):  
Vibration Control ◽  
Magnetorheological Dampers ◽  
Cable Vibration ◽  
Fluid Leakage

Reduction of structural vibrations with the piezoelectric stacks ring

2020 ◽  
Vol 64 (1-4) ◽  
pp. 729-736
Author(s):  
Jincheng He ◽  
Xing Tan ◽  
Wang Tao ◽  
Xinhai Wu ◽  
Huan He ◽  
...  
Keyword(s):  
Vibration Control ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Structural Vibrations ◽  
Rotor Systems ◽  
Fea Model ◽  
Piezoelectric Stacks ◽  
Shunt Damping ◽  
Reduction Effect ◽  
Euler Bernoulli Beam

It is known that piezoelectric material shunted with external circuits can convert mechanical energy to electrical energy, which is so called piezoelectric shunt damping technology. In this paper, a piezoelectric stacks ring (PSR) is designed for vibration control of beams and rotor systems. A relative simple electromechanical model of an Euler Bernoulli beam supported by two piezoelectric stacks shunted with resonant RL circuits is established. The equation of motion of such simplified system has been derived using Hamilton’s principle. A more realistic FEA model is developed. The numerical analysis is carried out using COMSOL® and the simulation results show a significant reduction of vibration amplitude at the specific natural frequencies. Using finite element method, the influence of circuit parameters on lateral vibration control is discussed. A preliminary experiment of a prototype PSR verifies the PSR’s vibration reduction effect.

Examination of Vibration Control of Linear Oscillatory Actuator

2009 ◽  
Vol 129 (2) ◽  
pp. 184-190 ◽  
Author(s):  
Bu Yinggang ◽  
Ryota Aotsuka ◽  
Tsutomu Mizuno
Keyword(s):  
Vibration Control
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