Study On Control Method Of Initial Disturbances Of Multiple Launch Rocket System

As a mobile,rapid,sudden and fierce firepower suppression weapon,the multiple launch rocket system(MLRS)has been paid wide attention,obtained key development and got lots of equipment worldwide.However,poor firing dispersion and firing precision have seriously restricted the development of MLRS for a long time,which have become an international problem.As an important part of the national 973 major project,a new type MLRS is taken as the research object in this thesis.From the viewpoint of the large system dynamics including rockets,gun,propellant and launch environment,and from three aspects of theory,computation and test,the control theories,methods and techniques of initial disturbances are discussed systematically through an in-depth study on the whole process of launch and flight dynamics of the MLRS.The main research achievements in this thesis are as follows:(1)Applying the transfer matrix method for multibody system,the launch dynamics model,the topology figure,the overall transfer equation,the eigenfrequency equation,the body dynamics equations and dynamic response equations are established for the new type MLRS,respectively.A simulation and design software of the launch and flight dynamics of the MLRS is developed,while the rapid computation is realized,and the simulation results have been validated by modal tests,dynamic response tests and firing tests,which provide an important basis for analysis,optimization and design of initial disturbances and the other dynamic performances of the new type MLRS.(2)The theoretical and experimental research results show that,with the improvements of modern testing and processing technology,initial disturbances of rockets have become the most important factors affecting firing dispersion and firing precision of the MLRS,so that the firing dispersion and firing precision can be improved effectively by controlling initial disturbances,which provides important theoretical and experimental bases for the small initial disturbance design methods for firing dispersion and firing precision of the MLRS.(3)The correlation analyses prove that the angular motions of the rockets moving in the launch tubes are positively related to the angular motions of the multiple rocket launcher,while the dynamics mechanism is proclaimed that,by controlling the angular motions of multiple rocket launcher,initiating disturbances of rockets and firing dispersion and firing precision of the MLRS can be improved.(4)The passive and active vibration control of the multiple rocket launcher are realized by using launch technique of variant firing order and variant firing intervals,vibration control technique of independent modal,impulse thruster control technique,while the initial disturbances are controlled and the firing dispersion and firing precision are improved.By controlling the angular velocities of multiple rocket launcher using impulse thruster control technique,the firing dispersion and firing precision of the MLRS are improved for the first time in the engineering practice,resulting in engineering application achievements.Thus,the control theories,methods and techniques of initial disturbances established in this thesis are validated by the tests.