Launch Danamics Model of A Multiple Launch Rocket System(I)

The launch of multiple launch rocket system(MLRS)is a process of complicated dynamics.By means of a rigid multi-body dynamics model,the launching process was simplified into a mechanical system composed of chassis,rotating mechanism,elevating part and rocket ammunition.The mechanical system was simplified into 11 degrees of freedom in half constraint period,and the system was simplified into 9 degrees of freedom in full constraint period.The coupled dynamics equation group of motions of rocket ammunition and launcher were derived with the aid of velocity matrix method.The integral algorithm of the burning gas force towards the head face was put forward.This algorithm can provide theoretic model for analysis and calculation of spatial attitude of rocket and vibration of rocket launcher at the moment of rocket lea-ving launcher.