Numerical Simulation Research On Structural Characteristics Of Six-component Test Stand

The advancement of aerospace technology has always been a key indicator to measure whether a country’s comprehensive national strength is strong.Entering the 21 st century,with the advent of the fifth-generation fighter,vector thrust technology has gradually become a field that various powers are competing to conquer.The precise measurement of vector thrust is of great significance to the development of aero-engines.This paper takes the six-component test bench as the research object,and takes the accurate measurement of the vector thrust of the aero-engine as the research goal,a series of studies have been carried out on the theoretical analysis of the six-component test bench,the construction of numerical models,and the mechanism of the core components.The support method of the test bench and the layout plan and position of the force measuring components of the core components are determined.By comparing various schemes,the mechanical model and six-dimensional force calculation formula of the test bench are established,and based on the actual test situation,combined with finite element analysis technology,the horizontal suspension support mode of the test bench and the layout plan and position of the six-component force measuring component are determined.The relationship between the performance indicators of the test bench and the mathematical model is established.By simplifying the mechanical model of the test bed,the calculation formulas of the isotropy,sensitivity and stiffness matrix of the test bed are deduced,which provides a theoretical basis for the debugging,assembly and thrust measurement of the actual test bed.Numerical models of the force-measuring components and other components of the core components of the test bench are built.Using the relevant theoretical knowledge of material mechanics,the numerical model of the force-measuring component and other components was built,and the value range of the dimension of the force-measuring component was obtained.Combined with finite element analysis technology,the correctness of the mechanical model of the force-measuring component was verified.And carried out the multi-dimensional force,stress and strain simulation analysis of the force-measuring component,and obtained the stiffness variation law of the force-measuring component.The six-component test bench vector thrust,modal analysis and thermodynamic simulation experiments were carried out.Based on the numerical model of the test system built,the mechanical simulation experiment of the test bench was carried out,and the data error was controlled within 3% by comparing the actual experimental data,which verified the correctness of the numerical model;Based on this,the vector thrust simulation experiment of the test bench was carried out,and the mapping relationship between the stiffness difference of the force measuring component and the force of the test bench was preliminarily revealed.Through the modal analysis of the test bench and the simulation analysis of heat conduction and tail flame radiation at the nozzle during the engine test run,the comprehensive heat transfer path of conduction and radiation in the bench system was determined.The variation law between the temperature at each sensor and the thermal commissioning test time is obtained,which ensures that the sensor works in a suitable temperature range,and provides a basis for thermal insulation and control of the commissioning time for possible temperature effects.