A Study On The Influence Of Propulsion Systems On The Flight Stability Of Loitering Munition

Loitering munition is an advanced intelligent munition with high integration and complexity,and it is an important part of unmanned combat system in future war.Especially for small loitering munition,its power system is usually in the form of small pulsating engine or turbojet,and the influence of power system on flight stability is particularly important.The research and development of small loitering munition in our country is in the initial stage,and the research on its power system is few.In view of this,a two-step parameter identification method for dynamic system is proposed in this paper,and based on the identified parameters,the influence of the dynamic system on the longitudinal channel stability of the loitering munition is studied.The specific research contents of this paper are as follows:1.The motion model of small loitering munition is established,and the six-degreeof-freedom flight model is simplified into longitudinal plane according to the effect of thrust on flight2.A small-scale turbojet thrust table test was carried out,and the test data of the thrust table(throttle command,speed,thrust,etc.)were collected and post-processed3.According to the test data,the whole identification and two-step identification are carried out.The result of two-step identification is obviously better than that of the whole identification4.The identified model is added to the motion model of the loitering munition,and the motion stability in the longitudinal plane is analyzed and verified.