Numerical simulation on initial disturbances of ship-borne rockets under random excitations

The model of ship-borne rockets during the semi-constraint period was presented, comprehensively considering multi-factors, including the mass eccentricity, dynamic unbalance and ship swaying motion. The presumable range of initial disturbances excited by the three excitations were calculated respectively by using the method of limited range random excitation, and the total presumable range of initial disturbances were also calculated. The variation of total presumable range of initial disturbances in figure was gained. The simulation results show that the initial disturbances excited respectively by the three disturbance factors have the same magnitude, and the influence degree of dynamic unbalance and ship motion on the initial disturbances are severe. The initial disturbances excited by ship swaying motion remarkably increase as the maximum rolling angle increases, and the total presumable range of initial disturbances tend to the individual one excited by the factor which influence is much more than those of other factors.