Objectives  Due to lower weight and volume under the same working conditions, permanent magnet equipment is extensively used by many kinds of ships. However, its measured vibration at high frequencies is much higher than traditional equipment, which will affect the ship's acoustic performance, and reduce the effectiveness of using such equipment in ships. A kind of compound rubber vibration isolator is therefore designed to solve this problem.

  Methods   In order to isolate the vibrations of a given piece of permanent magnet equipment, a compound rubber vibration isolator is designed by inserting middle mass into a rubber isolating system. The transmission characteristics of traditional and compound rubber vibration isolators are compared, and experimental validation for the isolating design is carried out.

  Results  The results show that the proposed compound vibration isolator is feasible and can improve the vibration isolation effect of a piece of permanent magnet equipment's machine leg at high frequency. This effect can improve 20 dB compared to traditional rubber vibration isolators.

  Conclusions  As a method for vibration control, the designed compound rubber vibration isolator can effectively control high frequency vibration.