Abstract:In order to solve the problem of excessive vibration of an aircraft rocket firing unit, a special vibration isolation system is designed. Firstly, six groups of vibration isolation performance with different natural frequencies and amplification factors are calculated by the vibration isolation theory. Considering the requirements of vibration isolation performance and durability life, the vibration isolation parameters are selected, and the stiffness and damping of the isolator are calculated. Secondly, according to the core components of the vibration isolation system, four rubber formulations with different hardness were designed and four specimens were prepared respectively. Based on a universal testing machine, the stiffness and hysteresis loops of these specimens were tested. The variation of stiffness and damping of rubber damper with hardness was obtained. Then, according to the properties of the vibration isolation system calculated before, the hardness of the required rubber is obtained by fitting and verified. At last, based on the electromagnetic shaking table, a vibration isolation system was designed to verify the vibration isolation performance and vibration durability life. The test results show that the performance of the designed vibration isolation system can meet the requirements of the aircraft rocket firing unit.