CAJ | 학술논문

为了研究细长体导弹的横向振动特性，将大长细比导弹看成具有轴向速度和轴向力的自由梁，对弹体振动进行动力学建模和频率分析。首先采用 Hamilton 原理建立系统的动力学方程，然后采用复模态技术推导系统的固有频率，进而分析轴向力、轴向速度及气动力对系统特性的影响。仿真中，将建立的模型与常规动力学模型进行了对比。仿真结果表明，随着轴向运动速度和轴向力的增大，系统的频率降低，稳定性下降。
위료연구세장체도탄적횡향진동특성，장대장세비도탄간성구유축향속도화축향력적자유량，대탄체진동진행동역학건모화빈솔분석。수선채용 Hamilton 원리건립계통적동역학방정，연후채용복모태기술추도계통적고유빈솔，진이분석축향력、축향속도급기동력대계통특성적영향。방진중，장건립적모형여상규동역학모형진행료대비。방진결과표명，수착축향운동속도화축향력적증대，계통적빈솔강저，은정성하강。
To investigate the vibration of flexible missile,the dynamics modeling and frequency analysis were conducted by taking the missile as a free-free beam with axial velocity and axial thrust.The system dynamic equation was firstly established based on the Hamilton principle,then the natural frequencies of the system were deduced using the complex-mode method,and subse-quently the effect of axial force,axial velocity and aerodynamic force on the system performance was presented.In the simula-tions,the proposed model was compared with the conventional model.Simulation results show that axial velocity and axial force may lead to a decrease of vibration frequencies of the system,and the system stability shows a descending trend along with the increase of axial velocity and axial force.