Research on a Novel Combined Fused Silica Cylinder Shell Vibrating Gyroscope
|School||National University of Defense Science and Technology|
|Keywords||Cylinder shell vibrating gyroscope Combined fused silica resonator Influence factors of Q factor Fabrication Performance test|
A novel combined fused silica cylinder shell vibrating gyroscope is proposed in this dissertation. The cylinder wall and the bottom of the fused silica resonator are fabricated separately, and then are connected by glue. With this method, the manufacturing difficulty of the fused silica cylinder vibrating gyroscope can be reduced significantly and the gyroscope performance can be retained without obvious degeneration.In this dissertation, the combined fused silica cylinder shell vibrating gyroscope is studied systematically, including the theoretical analysis, fabrication and performance test. The research results are shown as follows:1. Mathematical model of the combined fused silica resonator was built, and the structure characteristic of the resonator was studied. The relationship of resonance frequency and size of resonator was analyzed by the model simulation. It is shown that the diameter and thickness of the resonance cylinder wall have a major influence on resonator, which provided a reference for the structure design of the resonator.2. The influence factors of Q factor of the combined resonator are investigated theoretically. And the various experiments on the influence factors are performed. The experimental researches are conducted to study the factors which influence the quality factor of the combined resonator, including the material, the size and the shape. It is shown that the combined resonator’s Q factor is retained without remarkable deterioration comparing with an integral resonator’s Q factor, and the material, the shape and the diameter of the resonator are the crucial influence factors of the quality factor.3. The fabrication processes of the combined fused silica cylinder shell vibrating gyroscope are studied, including machining processes of the cylinder wall and the bottom of the fused silica resonator. The precision balance method for minimizing the natural frequency split of the resonator is described. The natural frequency split is reduced to 0.05Hz after mechanical balance.4. A combined fused silica cylinder shell vibrating gyroscope is fabricated, and the performance is tested. The result shows: the Q factor is 6400, and the frequency-temperature coefficient is 8.64 ?1 0? 5/℃. In the measurement range of±100?/s, the scale factor is 112.5mV/(/s), the nonlinearity is 0.75%, the bias stability in two hour at room temperature is 1.6?/h.