Finite Element Analysis And Optimization Design Of Large Rocket Body Static Test System Structure

With the development of the aerospace industry,the launch vehicle is getting larger.At present,the structural form of the rocket body static test bearing system mainly includes two types of structures:the platform and the afterburner combination and the "ceiling" type.The main work of this paper is to complete the structural design of the "ceiling" type load-bearing system for the large-scale rocket body static test,and the structural and dimensional parameter design of the top load-bearing system,support system,and test platform.The finite element static analysis of the top load-bearing system,support system and test platform was completed using ANSYS software,and the structural optimization design and reliability sensitivity analysis of the top load-bearing system,support system and test platform were performed.Develop a reliability estimation software system for reinforced concrete support systems based on VB platform and APDL technology.This article mainly completed the following works:(1)Complete the design of the "ceiling" type large rocket body static test bearing system.The "ceiling" type load-bearing system is equipped with a hydraulic cylinder on the top load-bearing system,which can simulate the launch and flight loads of the rocket.The test uses the "reaction pressure plate" load.The truss structure design of the top load-bearing system was completed.The truss and reinforced concrete structures were designed for the support system.The test platform was designed as a cast structure.Orthogonal optimization design was performed on the dimensional parameters of the top bearing system,support system and test platform.(2)Complete the finite element static analysis and optimization design of the large rocket body static test bearing system.A total of 160 models of the top load-bearing system,trussed support system and test platform in Orthogonal test were parameterized in Solidwork,and the finite element static calculation was performed in ANSYS Workbench.Reinforced concrete support system uses APDL language parameterized modeling in ANSYS for a total of 12 models and performs finite element static calculation.The static analysis mainly includes strength and stiffness analysis.Taking the minimum weight of the top load-bearing system,support system and test platform as the optimization goal,reducing the cost of manufacturing materials,optimizing its size parameters under the conditions of strength and stiffness,and determining the optimized structure form and size parameters.(3)Complete the reliability sensitivity analysis of the large rocket body static test bearing system.The reliability sensitivity analysis module of ANSYS Workbench was used to analyze the reliability sensitivity of the top bearing system,support system and test platform.(4)Completed the development of reliability estimation software for reinforced concrete support systems.Based on the Visual Basic 6.0 software platform,combining the VB platform and APDL technology,a reliability estimation software system for reinforced concrete support systems has been developed.The system has functions of parameter input,reliability calculation and result storage and display.Provides estimation software for determining the component size and material performance reliability calculation under certain dispersion in the design.