Analysis And Optimization Of The Structure Of The Rocket Propelling Device With Large Load And High Rigidity

The rapid development of science and technology has made new changes in the rocket weapon system.For exanple,the emergence of the new launch mode has brought the large Joad and high stiffness rocket propelling device in the paper.In order to bear the effect of heavy load,under the premise of meeting the requirements of thrust stability,the propelling device has met its large load and high stiffness,and ensured that the overall stiffness of the system was controlled within a certain limit,and guaranteed the equilibrium of the structural stffness.This paper has studied the new changes ofthe structure of the launchsystem and some of the problems.Firstly,the large moving load was approximated by the multi-position working conditions,and with the topology optimization technology,we completed the structural conceptual desiga Secondly,the solution of loading of large toad was carried out by the subprogram development of Abaqus.The finite element dynamic analysis results show that the stiffness of the reconstructed model structure is enough,but each section of proportionality is poor,which directly affects the thrust stability control Then,in order to improve the stiffness equilibrium characteristics,the structure was adjusted properly and 22 design variables were set according to the maximum deformation curve.And through the design of experiments(DOE),the struCtural performance analysis was carried out.And subsequently,by sampling and response surfece design,comparing with the optimization effects of different algorithms,the final structure adopted the global optimization design result based on real-code genetic algorithm(RCGA).Finally,we accomplished the modal analysis and dynamic verification on the final structure.The results show that the performance of the final launcher structure is greatly improved,and the structure take into aceount the high stiffness,the balance of deformation and the light weight.The maximum deformation is less than 1mm,and the maximun deformation curve is approximately a horizontal line.The final mass of the structure is about 8.9t,which is about 16%less than that before optimization.The new rocket propelling device structure lays the foundation for the following study of the rocket launching system and provides design methods and ideas for the mechanical structure similar to having large toad and high stiffness.