Vibration analysis on the flexible decelerating system of terminal-sensitive submunition

摘要

The flexible decelerating parachute was predigested as a perimeter fixed roundish film in this paper. Before the rigid and flexible coupling dynamics model of the terminal-sensitive submunition was founded, the parachute had been considered as the flexible body, and the distortion of the parachute had been expressed with the hybrid coordinate method. On these basises, the floating coordinate system was founded. The parachute's distortion was divided into two parts: one was the global movement; the other was the relative distortion at the floating coordinate system. In other words, the floating coordinate system was fixed, the elastic deformation was expressed with modal spread method, and the kinematics of the terminal-sensitive submunition was analyzed. The vibration model of the flexible decelerating system was finally founded. On the base of it, the vibration analysis was simulated with ANSYS, and the natural vibration frequencies and the vibration modes of the flexible parachute system were gained. The results can provide the flexible decelerating system design of the terminal-sensitive submunition with some helpful references.