Research On High Precision Measurement Method For Mass Center Of Multi-state Missile Launcher

Missile launchers are used for missile storage,transportation and launching,and significantly affect the performance of missile launching system.Mass property is an important index in the process of design and development of missile launchers.The accuracy of measurement results has a great influence on the handling stability,ride comfort and safety of missile launchers.Accurate measurement of mass property of missile launcher is a necessary condition to ensure the dynamic performance of missile launcher.In this paper,the mass centroid measurement method of missile launcher is investigated.Two kinds of mass centroid measurement schemes of missile launcher are designed,analyzed and compared,and the optimal measurement scheme is determined.Coordinate systems,the transformation relationships between the coordinate systems,and the mass center measurement of missile launchers are established.Based on the involved kinematics equations,dynamical equations,and transformation relationship between coordinate systems,the measurement scheme and principle of mass center of missile launchers are designed.In order to meet the requirements of high precision,wide range,and multi-state measurement,this paper proposes a multi-range measurement scheme,which categories the measured vehicles into heavy vehicles and light vehicles according to their mass magnitude.It can reduce the mass of the system tooling,and then adopt small-range high precision measurement sensors to improve the measurement accuracy.The platform support reaction method is used to measure the mass property of missile launchers.Pitching scheme and rolling scheme for the measurement of mass center are proposed.Considering the general state and the erection state of the missile launcher,the feasibility of the scheme is analyzed.Detailed scheme designs for pitching scheme and rolling scheme are carried out,including the overall composition of the system,mechanical structure and measurement flow design.The attitude angle measurement scheme is analyzed.Based on the principle of multi-point weighing,the mass center measurement method is designed and analyzed,including the establishment of measurement model,measurement principle,measurement scheme analysis and comparison.Then the structure design and analysis of the tilting platform of the two measuring methods are carried out.Considering that the mass launchers under measurement has the characteristics of large mass and large volume,the finite element analysis software is used to analyze and simulate the mechanical deformation of the overturning platform structure.The effect caused by the structural deformation is discussed.Finally,considering the multi-state measurement of launch vehicle,the uncertainty of measurement,platform overturning and sensors overload are analyzed.The two measurement schemes are compared comprehensively in terms of measurement error,structural deformation,reliability and practicability.Considering the measurement accuracy,mechanical structure and safety,and the requirements of wide range and high precision measurement,the rolling measurement scheme is better than the pitching measurement scheme.However,the rolling measurement scheme needs to consider the design of enhanced protection measures to improve the safety of the missile launchers in the measurement process.