Research On The Temperature Stability Of The Bias And Uncertainty Analysis Of Miniature Inertial Sensor

Inertial navigation technology is widely used in many important fields such as aviation,aerospace,navigation,high-speed rail,etc.It has the advantages of strong autonomy,high accuracy,safety and reliability.Miniature inertial sensor are the core components of inertial navigation and guidance systems.They are used to measure the motion of sensitive carriers in space in real time and provide accurate position and speed information for navigation and guidance.The performance of the Microminiature sensor largely determines the accuracy of the navigation and guidance system.Modern high-precision navigation and guidance put forward high requirements on the accuracy of the miniature inertial sensor.The output bias of the miniature inertial sensor is an important performance index.The temperature stability of the bias has a great influence on the navigation accuracy of the inertial navigation system.However,many uncertain errors in the actual production and assembly process,such as the thickness of the glue,the bonding angle of the glue layer,and the size of the preload force,etc.,will affect the temperature stability of the output bias of the micro inertial sensor,which affect the pass rate of the sensor.Therefore,it is of practical engineering value to analyze and study various uncertain factors that affect the temperature stability of sensor bias.In this paper,a certain type of miniature inertial sensor is used as the research object,using the uncertainty analysis theory,combined with ABAQUS simulation and MATLAB programming to study the influence of each uncertainty error of the sensor assembly process on the temperature stability of the sensor bias,the main contents are as follows:(1)The structure and working principle of the miniature inertial sensor are introduced,the mathematical expression of the output bias value of the sensor model under study is obtained,and the temperature stability expression of the sensor bias value is derived by derivation of the temperature.Through analysis,it is determined that the change of the disturbance torque caused by the deformation of the flexible shaft and the change of the capacitance difference caused by the deformation of the pendulum are the main factors affecting the temperature stability of the miniature inertial sensor bias.(2)The full temperature drift of the output bias of the inertial sensor is used as a reference to quantitatively analyze the effect of the change in capacitance difference caused by the deformation of the pendulum and the change in the interference torque caused by the deformation of the flexible shaft on the temperature stability of the bias value of the miniature inertial sensor.The meta-analysis method establishes the temperature variation model of the sensor pendulum component,and formulates a standardized process for the temperature stability simulation and data processing of the miniature inertial sensor bias value.(3)Study the construction method of the proxy model in the uncertainty analysis,use the innovative polynomial chaos construction method to obtain the relationship between the full temperature drift of the sensor bias and each parameter,and use the Sobol sensitivity analysis method to quantitatively analyze the elasticity of the glue layer The influence of the modulus error and the adhesive angle error of each adhesive layer on the temperature stability of the sensor bias value is found.The main factors affecting the temperature stability of the sensor bias value during the assembly of the pendulum component are found,which provides a theoretical guidance for the error control of the assembly process of the pendulum component.