Numerical Simulation And Optimization Of High Performance Accelerometer

The effect of temperature on the stability of the accelerometer is very significant,especially in high-precision accelerometers,which is more pronounced and difficult to compensate,so many times the temperature-dependent characteristics of the accelerometer tend to be a key factor in whether the accelerometer is qualified.This is because on the one hand the accelerometer itself is a more complex structure,and the thermal expansion coefficient gap between components and parts is larger;on the other hand,the accelerometer is very sophisticated electronic products with high measurement accuracy,so its output is very sensitive to external temperature changes.The characteristics of temperature distribution is the problem in the whole development of the accelerometer.It is of great theoretical and practical value to study the influence of temperature change on the output of the accelerometer.In response to the phenomenon that the output of a high-performance accelerometer is not repeated and poor stability in the temperature changing environment,in this paper,a simple attempt is made to study the mechanism of the temperature variation characteristics of a high performance accelerometer under the condition of temperature variation,and the main work is as follows:(1)To explain the working principle of the accelerometer and its current situation and the current problems;to analyze the structure of the accelerometer;to fully describe the high-performance accelerometer structural characteristics and materials characteristics and to identify the impact of accelerometer temperature characteristics of the two main reasons from the structure and materials.(2)A complete and accurate finite element model of the high performance accelerometer is established in the finite element analysis software,and the simulation flow of the high performance accelerometer and the processing of the simulation result are introduced in detail.Then,this paper analyses the accelerometer hysteresis characteristics and three non-repetitive characteristics of the finite element simulation from the material properties and structural characteristics aspects,which more accuratly reproduces the phenomenon during the measured process.Finally,based on the simulation results,the height and angle of the pad in the accelerometer are optimized respectively,and the influence of the height and angle of the pad on the deviation and hysteresis of the accelerometer is listed taking into account the special characteristics of the accelerometer.What's more,It is concluded that modifying the pad angle may be a better way to optimize the thermodynamics of the accelerometer on account of the changeability of the structure of the accelerometer.(3)Moreover,this paper exlpains the relationship between the essential properties of the viscoelastic material and the hysteresis and the three non-repetitive phenomena of the accelerometer based upon the theory of viscoelasticity,and deduces the finite element discrete expression of the constitutive model of the viscoelastic material in the accelerometer.In addition,the UMAT subroutine is written based on the ABAQUS secondary development technology,which provides the theoretical basis for the viscoelastic analysis of the accelerometer.In the end,in view of the experimental results of the key materials in the accelerometer and the actual situation of the accelerometer,the viscoelastic simulation results of the accelerometer show that the results are in good agreement with the measured values of the accelerometer.