Abstract: A high-precision device in modern aviation is vibration sensitive, and its vibration isolation system has to realize multi-DOF vibration isolation in high vacuum and extreme temperature environments. Researchers propose an all-metal vibration isolation platform with six DOF in this paper. This platform uses a raft MRD as the parallel pair of the steward mechanism to realize the performance of six DOF vibration isolation in all metal. Researchers use the ADINA system to calculate the response characteristics of the vibration isolation system excited by random vibration, and the simulation results of the model prove the correctness of its principle. The researchers built a prototype and tested its performance. The test results show that the prototype can effectively attenuate the energy of random vibration in the three axes of X, Y, and Z when it is in the wide frequency range of 40-2000 Hz, and the total root-mean-square value of random vibration in each axis goes down from 2.2 g to less than 1 g. In addition, the prototype can also attenuate the energy of angular vibration in three axes. The research results can effectively solve the technical problem of poor adaptability of multi-DOF vibration isolation in extreme environments, and the results can be applied directly to vibration isolation technology in specific environments.

Key words: vibration isolation, six DOF, all metal, random vibration