Research of gyro torquer scale factor variation model and its stability

The torquer is used as a key component in a dynamically tuned gyro (DTG), affecting its long-term stability in storage conditions. The gyro torquer scale factor is a significant parameter for judging gyro stability. To study the principle and tendency of variation for the torquer scale factor of a dynamically tuned gyroscope, the main mechanism is first analyzed in storage condition based on failure mode, mechanisms and effects analysis (FMMEA) method, which determines its key components and the stress types. After studying the tendency of glue creep and alnico demagnetization following environmental stress and time, a long-term variation prediction model of the torquer scale factor is established. Then, a certain DTG is taken as an example, and the storage stability on the basis of the model is analyzed combining with its storage profile. Finally the value of torquer scale factor variation within five years is calculated; meanwhile, a comparison with historical data shows that the two trends are consistent, which proves the validity of this research approach. Furthermore, the acceleration factor is obtained through analyzing the established model which can also be used to study the acceleration characteristic of the gyro, so as to provide a basis for accelerated degradation test design.