Two-stage Vibration Reduction and Verification of Supersonic Dual-rail Rocket Sled System

Abstract

The rigid dual￣track rocket sled cannot meet the mechanical environment test requirements of the missile control device at a Mach number of 2. Aiming at this problem, the vibration data and characteristics of the rigid dual rocket sled were analyzed. The vibration response of the rocket sled is strongly related to the operating speed,and the root mean square value of the vibration increases non￣linearly with the increase of the speed. The higher the stiffness of the rocket sled is,the greater the vibration response is. When the speed of sled is 900 m/ s,the root mean square value of the vibration response reaches 120g. The vibration generated in the rocket sled test is random,and the frequency range covers 5-2 000 Hz,and the low￣frequency vibration is very severe. Based on the vibration characteristics of the rocket sled,the natural rubber and the sliding shoe were integrated and designed to reduce the stiffness of the sliding shoe,thereby reducing the vibration caused by the impact of the shoe and rail and realizing the primary vibration reduction at the vibration source of the rocket sled. Silicon rubber was used between the tested object and the rocket sled connection to achieve secondary vibration reduction. The damping effect was verified through dynamic characteristic response simulation,vibration table test,the sled rail coupling dynamics calculation and rocket sled test. The results show that after two￣stage vibration reduction,the lateral and vertical vibration root mean square overload is controlled within 12g. The vibration reduction in a wide frequency range of 100 - 2 000 Hz is realized. The lateral and vertical vibration reduction efficiency is 52% and 70% respectively. The study can provide verification technical support for rocket sled test of seeker.