考虑胶粘连接的石英挠性加速度计装配精度预测与分析

As a high-precision inertial navigation part, the quartz flexible accelerometer is usually assembled with adhesive joining, being difficult to predict their assembly precision accurately with traditional assembly theories depended on geometric quantities. To address this issue, a method was proposed for predicting the assembly precision of quartz flexible accelerometers based on the integration of macroscopic geometric deviation transfer, Monte Carlo statistical sampling, and mechanical simulation of adhesive joining. Initially, an assembly deviation transfer model based on the spatial coordinate transformation matrix method and a mechanical model for the epoxy adhesive 7-2312 were established. Subsequently, the deformation obtained from the adhesive joining simulation was introduced into the assembly deviation transfer model, and tolerance sampling was conducted with the Monte Carlo method, achieving accurate prediction of the assembly precision for the key structures in the quartz flexible accelerometer. Finally, the impact of factors such as the position and spot diameter of adhesive joints on the assembly accuracy was explored using the proposed method. The results indicate that under the designed part tolerances and nominal bonding parameters, the coaxiality error between the magnetic pole plate and the yoke in the torque device is less than 0.008 mm, and the end face parallelism error is less than 0.01 mm, and show a sensitivity to both the spot diameter and position deviation of adhesive joints. The coaxial alignment accuracy among the upper, lower torque devices and the pendulum is better than 0.011 mm, showing sensitivity to axial positioning errors of adhesive joints, but insensitivity to their circumferential positioning errors. The achievement can provide a theoretical foundation and methodological support for guiding the assembly adjustment in quartz flexible accelerometers.