Effect of time-varying factors on the drift model of Electrostatically Supported Gyro
Time-varying factors are extremely important in both dual-axis servo turntable and Electrostatically Supported Gyro (ESG) by affecting the testing of ESG's drift model. In this paper, we model four time-varying factors, gyro case mis-alignment angle, installation error between gyro and inner ring platform, turntable base fluctuation, and null position drift of turntable's angle sensor, as a polynomial of time in the drift model for pole ESG. Based on the kinematic formula of turntable in pole gyro mode, we derive the relationships between the time-varying factors and angles of inner and outer rings of the turntable. Then the cases that these four time-varying factors affect the trajectory of turntable are analyzed term-by-term. We find that the constant drift, gravity-related drift and random drift are greatly affected by these four factors. In the light of these analyses, several basic principles to control these factors are further proposed.
Design of Gyroscope’s Case Rotation Device
In order to improve the precision of gyroscope,case rotation is usually applied to automatically compensate drift error torque relative to the case.The paper introduces a kind of Brushless DC-Servomotor’s numeric control system and makes comparison with Russian Д-15 analog control system.At the same time,a special conductive device is designed between moving module and immobile shell.The result of experiment shows that the conductive device has longevity of service and high reliability.
Die wisselwerking tussen ekonomiese en konstitusionele hervormings in Suid‐Afrika
Abstract This article deals with the interplay between economic and constitutional reforms in South Africa. Historical and contemporary forces which obtain in these spheres are taken into consideration after which a number of conclusions are drawn.