防振ゴムを用いた動吸振器の特性

抄録

Elastic suspension systems are widely used for vibration reduction purpose. When disturbance vibrations contain undesirable frequencies, resonances may occur and the movements of the suspensions become harmful. In order to avoid the large resonances, dynamic absorbers are used. Then the systems assume two degrees of freedom. In this paper, characteristics of these systems are treated. The spring elements for both the main suspension systems and the dynamic absorbers are assumed to be rubbers which have complex spring constants. When the main suspension systems have no damping, the fixed point theory can be used and the optimum tuning condition and loss factor are obtained. When the main systems have dampings, optimum values are derived by introducing correction factors. Vibration transmissibilities are measured experimentally. The results show good agreement with calculated ones. It is concluded that the complex spring models can be applied for calculating vibration transmissibilities of dynamic absorbers using rubber vibration isolators.