Semi-Active Pulse-Switching Vibration Suppression Using Sliding Time Window

S Mohammadi,S Hatam,A Khodayari

doi:10.1155/2013/865981

Abstract

The performance of pulse-switching vibration control technique is investigated using a new method for switching sequence, in order to enhance the vibration damping. The control law in this method which was developed in the field of piezoelectric damping is based on triggering the inverting switch on each extremum of the produced voltage (or displacement); however, its efficiency in the case of random excitation is arguable because of the local extremum detection process. The new proposed method for switching sequence is only based on the fact that the triggering voltage level was determined using windowed statistical examination of the deflection signal. Results for a cantilever beam excited by different excitation forces, such as stationary and nonstationary random samples, and pulse forces are presented. A significant decrease in vibration energy and also the robustness of this method are demonstrated.

Highlights

The ability to reduce the vibration amplitude over a wide frequency band is essential in the vibration control
The results show that this method of control is not too sensitive to all of the types of excitation behaviors
The reason is that the sliding time window is always moving with the signal, and with the variations of signal during the time, the statistical values change proportionally as well

Summary

Introduction

The ability to reduce the vibration amplitude over a wide frequency band is essential in the vibration control. This paper utilizes statistical analysis of the structural deflection to predict the optimum instants for the switching sequence in order to maximize the extracted energy and vibration damping. This new developed strategy allows an easy implementation of this damping technique for any type of excitation forces. The following section describes the multimodal model used for simulation, as well as the pulse-switching device model It is followed by a discussion on the strategy of semi-active vibration control using sliding time window and the proposed statistical method

Theoretical Model of the Semi-Active Pulse-Switching Device

Results in the Case of Vibration Damping

Conclusion