Vibration Suppression of a Large Beam Structure Using Tuned Mass Damper and Eddy Current Damping

Jae-Sung Bae,Jeanho Park,Jai-Hyuk Hwang,Daniel J Inman,Dong-Gi Kwag

doi:10.1155/2014/893914

Abstract

For a few decades, various methods to suppress the vibrations of structures have been proposed and exploited. These include passive methods using constrained layer damping (CLD) and active methods using smart materials. However, applying these methods to large structures may not be practical because of weight, material, and actuator constraints. The objective of the present study is to propose and exploit an effective method to suppress the vibration of a large and heavy beam structure with a minimum increase in mass or volume of material. Traditional tuned mass dampers (TMD) are very effective for attenuating structural vibrations; however, they often add substantial mass. Eddy current damping is relatively simple and has excellent performance but is force limited. The proposed method is to apply relatively light-weight TMD to attenuate the vibration of a large beam structure and increase its performance by applying eddy current damping to a TMD. The results show that the present method is simple but effective in suppressing the vibration of a large beam structure without a substantial weight increase.

Highlights

The suppression of mechanical and structural vibration has significant applications in engineering fields such as machine tool industries and civil, automotive, and aerospace structures
The key idea of the present study is to apply relatively light-weight tuned mass dampers (TMD) to attenuate the vibration of a large beam structure and increase its performance by applying eddy current damping to this TMD
In Case 1 the eddy current damping due to two magnets in horizontal plane is much smaller than that in vertical plane because magnetically tuned mass damper (mTMD) moves in vertical plane

Summary

Introduction

The suppression of mechanical and structural vibration has significant applications in engineering fields such as machine tool industries and civil, automotive, and aerospace structures. Over the past few decades much research effort has been applied to vibration suppression of engineering structures and machines. Passive methods have been used to attenuate mechanical vibration. The recent advances in digital signal processing and sensors/actuators technology have resulted in substantial effort in using active methods [1]. A popular method of passive vibration suppression is the use of constrained layer damping (CLD) treatments using viscoelastic material. The vibration of a beam can be suppressed by active methods using smart materials like piezoelectric materials. Many researchers have applied these methods to lightweight flexible beam structures. To suppress the vibration of a beam structure, which is large and heavy, very large actuation force is required and these methods may not be available. Active methods using piezoelectric materials may not be successful due to the limitation of actuation force.

Objectives

Methods

Results

Conclusion