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在捷联惯性导航系统中石英挠性加速度计是其核心器件,加速度计的温度特性直接影响其测量精度。在高精度的惯性系统中,需要对加速度计组件进行精度优于0.05℃的温度控制。为了研究加速度计组件精密温控系统,利用有限元分析软件ANSYS建立石英挠性加速度计组件温控系统的有限元模型,仿真计算其有限元模型的温度场。首先根据组件的结构特性建立了其有限元模型,介绍了热分析中求解条件的确定方法。通过仿真得到温控系统的温度场模型,根据温度场模型计算温度梯度并且确定系统的测温点、控制方式,最后利用加速度计输出数据验证分析结果的正确性。研究结果可以为加速度计组件精密温度控制系统中的测温点选取、控制方式确定以及捷联惯导系统中温度补偿、温度控制与熟优化提供参考依据。
Quartz flexible accelerometer is its core device in strapdown inertial navigation system, the temperature characteristics of the accelerometer directly affect the measurement accuracy. In high-precision inertial systems, the accelerometer components need to be temperature-controlled to better than 0.05 ° C. In order to study the precise temperature control system of accelerometer components, the finite element model of quartz flexible accelerometer temperature control system was established by using the finite element analysis software ANSYS, and the temperature field of the finite element model was simulated. First of all, the finite element model is established according to the structural characteristics of the components, and the method of determining the solution condition in the thermal analysis is introduced. The temperature field model of the temperature control system is obtained by simulation. The temperature gradient is calculated according to the temperature field model and the temperature measurement points and control methods of the system are determined. Finally, the correctness of the analysis results is verified by the accelerometer output data. The results of this study can provide references for the selection of temperature measurement points, the determination of control methods and the temperature compensation, temperature control and cooked optimization in the SINS precision temperature control system.