Research On Temperature Varying Characteristics Of Photoelectric Micro Inertial Devices Based On ABAQUS Secondary Development

Photoelectric micro inertial device is one of the key components in inertial navigation and guidance system and its performance greatly affects the accuracy of navigation and guidance.Due to the change in ambient temperature or the heating of circuit elements in the system,the working environment temperature of micro inertial device always produces inevitable fluctuation.Moreover,due to the change of working temperature,the performance indexes of micro inertial device will also change.In the inertial navigation system micro inertial devices are widely used,the measurement error of micro inertial devices caused by temperature varying will seriously affect the accuracy of inertial navigation system after the second integration.Thus,the instability and non-repetition of the output of high precision micro inertial devices in the environment of temperature varying is the key problem in the manufacturing process of micro inertial devices.However,the output fluctuation of micro inertial devices caused by temperature varying is difficult to be compensated by effective means and there are few researches on the theory of temperature varying performance of micro inertial devices and the generation mechanism of output instability and non-repetition.Therefore,it is of great significance and engineering realization value to study the temperature varying output characteristics of micro inertial devices for military and national defense and even civil engineering fields.In this paper,a photoelectric micro inertial device is taken as the research object.Based on the secondary development of ABAQUS software,the simulation analysis and experimental verification of temperature varying output characteristics of the photoelectric micro inertial device are realized,and a set of finite element parametric design process is established.The main work content is as follows:First,based on the research and analysis of the structure and working principle of the photoelectric micro inertial device,the output characteristics of the photoelectric micro inertial device under the condition of temperature variation are described.Second,from the viscoelastic material properties of adhesive rubber,various viscoelastic constitutive relation is introduced in detail.Combined with the generalized Kelvin model,the relationship between the mechanical properties of viscoelastic material and the temperature varying output of photoelectric micro inertial devices characteristics is studied.The time-temperature equivalence principle of viscoelastic materials and the method of obtaining the principal curve of relaxation modulus are briefly introduced.The aging viscoelastic constitutive relation of adhesive is established by introducing aging development equation of adhesive.Third,based on the viscoelastic constitutive relation of thermal aging,the numerical analysis method of photoelectric micro inertial devices is studied.The incremental form of viscoelastic constitutive relation of thermal aging is established.ABAQUS finite element simulation software is used to develop the UMAT user material subroutine.The viscoelastic constitutive relationship of thermal aging is verified and analyzed by different temperature test experiments and finite element simulation on three experimental models included adhesive block,wafer-adhesive structure,waferadhesive-sheetmetal structure.Forth,the relationship between ABAQUS software and Python language and the method of developing ABAQUS script interface are introduced.Combined with the software operation design process,the finite element parametric design process of ABAQUS secondary development based on Python language is established.The effects of different factors on the output performance of photoelectric micro inertial devices are studied by means of the simulation results of simple bonded structures and the influence relation and rule characteristic are obtained.