多随机激励作用下舰载火箭弹初始扰动数值模拟

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

建立了半约束期内舰载火箭弹弹轴转动方程组模型,综合考虑火箭弹的质量偏心、动不平衡和舰船的摇摆运动,采用有限幅值随机激励仿真的方法,得到了3种激励分别引起的初始扰动可能域和考虑各因素后总的初始扰动可能域,并分析得到了总的初始扰动可能域图像变化规律。仿真结果表明,3种扰动因素分别引起的初始扰动量在相同量级上,动不平衡和舰船摇摆对初始扰动的影响程度更为剧烈。舰船摇摆对初始扰动量的影响随着最大横摇角θmax增大而显著增大,总的初始扰动可能域图像趋近于对初始扰动量贡献中所占比重较大因素引起的初始扰动可能域图像。

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.