Study On Flutter Suppression Of The Large Aspect Ratio Missile

In order to improve the speed of the missile,increase the range of the missile,enhance the mobility of the missile and the precise impact of the target,the current missile structure of the aspect ratio becomes more and more.With the increase of the aspect ratio,the flexibility of the missile becomes larger and the resonance phenomenon is more likely to occur,and the low frequency flutter becomes the problem that people have to pay attention to.The low frequency flutter of the missile is due to the excitation of the missile,the first two modes of resonance generated by the low frequency of large displacement vibration.The study of flutter problem is to study the dynamics of missile systems.In this paper,the basic theory and characteristics of dynam ic analysis are expounded,and the frequency domain numerical solution of structural dynamics response is introduced.The transfer function is used to solve the dynamic response of the aircraft.After ignoring the aerodynamic shape and the internal structu re of the impact,the missile is simplified into a beam model.The modal analysis and dynamic response analysis of missile simplified beam model are carried out by programming numerical simulation and finite element software simulation.The numerical resul ts are obtained by programming with MATLAB,and compared with the finite element software analysis results,the validity and correctness of the numerical method are verified.In this paper,the influence of the aspect ratio on the missile flutter is also considered.In the modal analysis of the modal analysis,the beam model is calculated for different beam length and different lengths.The corresponding results are obtained and analyzed.Found that the larger the diameter ratio of the missile,the more likely to produce low frequency flutter,and the greater the amplitude of vibration,the missile is more likely to produce damage.In this paper,a chatter suppression method is proposed.When the missile generates low frequency flutter,a high frequency excitation is applied inside the missile to increase the energy of the missile,so that the missile avoids the large displacement vibration of the low order frequency.Resulting in high-frequency small displacement vibration,thus avoiding the flutter damage.The validity of the method is verified by theoretical derivation and numerical calculation and finite element simulation.