Four-Elements Model Representation of Rubber Vibration Isolator

Three kinds of mechanical models for rubber vibration isolators are analyzed, and their transmissibilities are compared with experimental results. Two-elements model which is known as Voigt model is widly used, but its calculated value of resonance frequency does not agree with the measured one. Three-elements model is composed of two spring elements and one damping element. The characteristics of resonance can be made to agree with experimental results by using proper values of three constants. However, when the mass of the load is changed, the calculated characteristics of resonance do not agree with the measured ones. Four-elements model is composed of two spring elements and two damping elements. In this case by using proper values of the four constants, the calculated transmissibility characteristics can be made to agree with the measured ones for the wide range of load mass. It is concluded that the four-elements model is most suitable for the rubber vibration isolator.