Research On The Technologies Of Oriented Stress On The Rigid Axis Of Cupped Vibrating Gyroscope

The cupped vibrating gyroscope is a typical cylindrical vibrating shell gyroscope,which has a set of advantages,such as high reliability,high accuracy,small volume,high impact resistance.However,due to the material defects and manufacture errors,this type of gyroscope is sensitive to environment temperature,which limits its application.Aiming at the temperature stability of the zero bias for cupped vibrating gyroscope,this dissertation proposes a method to improve the vibration stability of resonator by utilizing the nonuniform internal stress,and a novel structure which can produce oriented thermal stress is designed.The temperature characteristics of the rigid axis of the cupped vibrating gyroscope which possesses such structure are analyzed through simulation.Reprocessing of the oriented stress structure and comparison tests of the temperature stability for open-loop output are conducted.The main works of the research are listed as follows:1.The basic structure and operating principle of the cupped vibrating gyroscope are introduced.The influence factors of the cupped resonator and the gauge outfit related to manufacture process are comprehensively analyzed.The mechanism of the resonator's output bias drift is researched.2.The internal stress' s condition of the cupped vibrating gyroscope's resonator is introduced.The influence of typical internal stress on the frequencies and rigid axes of the cupped resonator is studied.By comparing the simulation test results,the oriented stress effect on the resonator's rigid axes is acquired: in the non-ideal condition,when there is nonuniform internal stress along the circle direction,the rigid axis' s position will deflect to the position where the internal stress is maximum.According to this effect,a method to improve the vibration stability of the cupped resonator by utilizing the oriented stress is proposed.3.A method to improve the vibration stability of the cupped resonator is proposed by utilizing the oriented stress.Structure design and performance analysis of the oriented stress structure are conducted.The operating modals and thermal stress distribution of an ideal cupped resonator which possesses the oriented stress structure are researched.By comparing the temperature characteristics of the traditional cupped resonator and the novel resonator with oriented stress structure,it is demonstrated from the theoretical simulation that such oriented stress structure can improve the stability of the resonator's rigid axis.4.By reprocessing the cupped resonator for the oriented stress structure,a resonator possessing such structural feature is acquired.And comparison tests of the temperature stability of open-loop output before and after the structure improvement are conducted.Test results show that the temperature drift of the open-loop output of the improved gyro is decreased by 38.60%,which confirms that the novel designed cupped vibrating gyroscope has better temperature stability of the rigid axis.