Instantaneous Measurement And Analysis Of Vibration Environment In Missile Launching Process

Measurement and analysis of vibration is a common problem in manufacture.The level of vibration analysis directly affects the productivity, the productionquality even the safety of equipments and human's life in the domain of aviation,spaceflight and navigation. The ship-based missile launching system is a complexflexible frame. In missile launching process, the launching platform and hull willvibrate under the various exciting force. Sometimes, the vibration not only isharmful to sailormen, but also can damage the equipments and instruments.Besides, there will be alternating stress, which can accelerate fatiguing ofstructure and influence the intensity of the hull, in the structure under thevibration. So, it's necessary to estimate the influence by the vibration precisely,by means of which we can get dynamic characteristics and responses, and we canchoose correct parameter to avoid resonance of ship and preserve sailormen'spersonal safety.The existing XX-X testing system is not capable of measuring and analyzingthe instantaneous vibration environment. In this article, the existing system isaltered to measuring and analyzing the signals in the launching process, such asvibration, noise, strain and stress. In the designing of testing system, vibrationsensors, noise sensors, strain sensors and stress sensors are used to transmitsignals. The signals collected are disposed by dynamic strain gauge, chargeamplifier and anti-mixing wave filter. Finally, the signals are input into computerthrough data collection card.According to the instantaneous measuring data in launching process and thetheory of modal analysis,a dynamic model of launching platform is established.By the method of ANSYS, the computations of the missile launching platform arecarried out, and the vibration properties of the system are obtained, such aseigenfrequencies and eigenmodes. The results provide the theoretical basis forfurther studies of the vibration mechanism and the technique of vibration control.