Three-dimensional Multi-physics Coupling Simulation Analysis And Improved Design For The Q-flex Accelerometer

Currently in the field of inertial technology, the most widely used and the fastest growing inertial devices are quartz accelerometers. It is characterized by low threshold, simple structure, low power consumption, light weight, easy miniaturization and low price. But there are also problems that environmental conditions will affect job stability and the measurement accuracy of quartz accelerometers. It also becomes a problem which restricted the further application of quartz accelerometers. In order to improve job stability, we use the method of the full temperature gravity field test and the torquer’s magnetic test combined with finite element numerical simulation to analysis the characteristic of quartz accelerometers.Firstly, we introduce the structure and working principle of quartz accelerometers and explain finite element analysis theory as well as multi-physics coupling theory. Then we establish a thermal-magnetic-structural deformation unidirectional coupling model.Secondly, from the perspective of thermal magnetic Unidirectional coupling, we use the method of the full temperature gravity field test and the torquer’s magnetic test combined with finite element numerical simulation, and mainly analyzes the energized coil and the compensation loop for the influence of the magnetic field.Thirdly, from the perspective of the three-dimensional thermal-magnetic-structural deformation unidirectional coupling, according to the torquer’s magnetic test and the results of thermal-magnetic unidirectional coupling simulation analysis, we studied the thermal field and the magnetic field effect on the structural deformation and obtained the law of pendulum piece’s structural deformation in different physical field, which can help us to improve the structure of torquer.Finally, we start from the factors which influence the magnetic field of torquer’s working air gap magnetic stability to improve the structure of torquer. And then we do a Three-dimensional simulation analysis to verify the validity of the new structure. Simulation results show that the improved design is better than before. It is provide a new solution from the structure to improve the working stability of quartz flexible accelerometer.