Study of Magnetic Vibration Absorber with Permanent Magnets along Vibrating Beam Structure

Abstract

The vibration absorbers are frequently used to control and minimize excess vibration in structural system. Dynamic vibration absorbers are used to reduce the undesirable vibration in many applications such as pumps, gas turbines, engine, bridge, and electrical generator. To reduce the vibration of the system, the frequency of absorber should be equal to the excitation frequency. The aim of this study is to investigate the effect of magnetic vibration absorber along vibrating cantilever beam. This study will aim to develop a position of magnetic vibration absorber along the cantilever beam to adopt the change in vibratory system. The absorber system is mounted on a cantilever beam acting as the primary system. The objective is to suppress the vibration of the primary system subjected to a harmonic excitation whose frequencies are varying. It can be achieved by varying the position of magnetic vibration absorber along the length of beam. The advantage of magnetic vibration absorber is that it can be easily tuned to the excitation frequency, so it can be used to reduce the vibration of system subjected to variable excitation frequency.

Dynamic Vibration Absorber with Negative Stiffness for Rotor System

“…Negative stiffness is a good solution for this problem and has been widely used in vibration isolator design. Permanent magnets are a good way to produce negative stiffness and have been widely used in single-direction vibration suppression, such as vibration isolators [27] or dynamic vibration absorbers [28], but, to the authors' knowledge, no permanent magnet has been used in dynamic vibration absorber design for rotor system. So, in this paper, a novel vibration absorber with negative stiffness produced by permanent magnet is proposed and its fundamental principles and characteristics are studied, and then experiments are carried out to verify the analytical results.…”