A Study on the Vibration Characteristics of MR Elastomers Based on Silicon

Abstract

This paper presents vibration characteristics of magnetorheological(MR) elastomer, whose elastic modulus are controllable by applied magnetic field. By using this property, the material can be applied to vibration absorber, so that the stiffness of the absorber can be changed and actively controlled according to the magnetic flux density. However, the various performances of MR elastomer depends on different polarized direction of particles by applied magnetic field and dimension during the manufacturing process. In this paper, in order to obtain the optimal characteristics of MR elastomer, MR elastomers with different types and dimensions are prepared for a series tests. Using this test setup, extent of natural frequency shifted against magnetic field at various excitation frequencies can be measured. Specimens are prepared with 3 types, as cylinder samples exposed to magnetic field vertically, horizontally and unexposed during cure, respectively. Also, a set of design variables are considered to produce MR elastomers. Through the modal tests of mass structure with MR elastomer, the optimal design as well as the polarization direction of MR elastomer is obtained among the various dimensions and 3 directional types of MR elastomers.

A study of inchworm robot by using smart materials

“…It is in solid state and has magnetic polarity particles in the polymer material such as natural rubber or silicon rubber. [2] As the stiffness of MR elstomer changes the coefficient of friction on surface of MR elastomer can be changed and this characteristic can be used to give driving force inchworm robot.…”

A Study of Vibration Damping Control for Hollow Drive Shaft

“…응을 통해 만들어진 실리콘 젤에 철, 니켈, 구리 분 말을 첨가하여 제작하였다 (14) . 이 수치들을 통해서 다이나믹 댐퍼의 크기를 결정할 수 있으며 고유진 동수 방정식은 다음과 같다 (13) .…”