Analysis Of The Vibration And The Dynamics Of Submarine Launched Missile

For very complicated mechanics problem about the water-exit process of submarine-launched in the environmental change, the modal, frequency, dynamic response of the submarine-launched missile underwater movement and the process of water-exit were studied in this paper. And some reference for the structural strength and stress analysis of the missile launching water-exit will be provided.The transverse and longitudinal vibration differential equations of free beam were deduced. Adding the underwater dynamic hydraulic pressure problem of free beam, the coupling vibration equation of free beam were deduced in this paper. Base on underwater vibration theory and fluid-structure coupling theory, the change rule of various modality in the process of the missile water-exit is obtained by ALE algorithm and finite element software ANSYS. Dry and wet modality and natural frequency of missile is calculated and the result is compared with former empirical formulas. Data difference is small. In the case of different launching velocity in some depth and different depth in some launching velocity, dynamical problem of missile water-exit is investigated by finite element software ANSYS\LS-DYNA and the change rule of interface stress and pressure of missile body structures with time is obtained. Meanwhile locations of maximum and minimum stress and pressure in missile body structures were found. It is show that average value of stress and pressure at top area, three quarters and bottom area of missile body structure are bigger than other positions.Dynamics problem of missile water-exit is complex and the researcher of this paper can provide technical references for vertical launching of submarine-launched missile.