Study on parameter drift mechanism of a quartz accelerometer with a system analysis method

A quartz accelerometer is a chief sensitive device of the inertial navigation system. However, there exists parameter drift during the process of transportation, storage or in work condition, which has a bad influence on the navigation accuracy. In this article, a system analysis method, the combination of FTA (Fault Tree Analysis) and FMEA (Failure Mode and Effects Analysis), is conducted to study the parameter drift mechanism of a quartz accelerometer and the conclusion is drawn that the mechanism mainly lies in the homogenization effect of vibration on welding residual stress. Finally, FEA (Finite Element Analysis) simulation is perceived to confirm the homogenization effect and demonstrates the correctness of the analysis results.