Design And Optimization Of Vibration - Damping System For Missile - Borne Micro - Inertia Measurement Unit

Miniature Inertial Measurement Unit (MIMU) is more and more widely used because of its advantages of small size, high reliability, suitable for mass production. Vibrations and shocks generated from the environment will decrease the accuracy of MIMU. Therefore a vibration damping design for MIMU is very necessary when it is applied in the field of munitions guidance. This paper introduces a vibration damping design for an MIMU mounted on a missile. The main contents of the dissertation are expressed as follows:1) Overall design of the vibration damping system. Design tasks were determined according to the performance of the MIMU and design requirements. Combined with design requirements, the natural frequency and damping ratio of the vibration damping system were determined on the basis of damping theory. Coupling characteristics of different shock absorber layout mode were analyzed and simulated through software ADAMS.2) Design of the shock absorber. This portion comprised the design of MIMU support, material selection of the shock absorber, shape design of the shock absorber, the optimization of damper stiffness, hardness selection of the shock absorber and modal analysis of housing.3) Simulation analysis on the damping system. Simulation analysis included modal analysis, harmonic analysis and transient dynamic analysis.4) Experiments on the damping system. Frequency sweep, random vibration and acceleration shock experiments were conducted on the damping system. The results showed that the parameters of damping system were consistent with the design values, and the damping system could effectively reduce the impact on the gyro from line vibration, and kept the MIMU working well after acceleration shock.