Experimental Study on Noninteracting Control of Dynamically Tuned Dry Gyro

Abstract

This paper reports on the experimental clarification of a method of reducing the interacion effect between the input and output proper to the Dynamically Tuned Dry Gyro (TDG) through improvements of the Rebalance Control Circuit (RCC) and the use of subtorquers with the main torquers.
First, the hardware of each element of the RCC, which is necessary for noninteracting control, was designed and manufactured, based on the parameters and figures specifying the TDG used in this study. Then, transfer functions of the TDG were derived, taking into consideration the manufacturing accuracy of the element, and the element was examined analytically to see how relationships between inputs and outputs, and the reduction of interaction effect, were affected by its accuracy. Next, the frequency characteristics of direct and cross transfer functions were measured experimentally by applying electrical inputs to the TDG, and their characteristics were transformed to values eqivalent to those for applied mechanical inputs. It has become evident after these experiments that the gain in cross transfer function, which corresponds to the degree of reduction of the interaction effect, can be decreased remarkably without influencing the characteristics of the direct transfer function which characterizes the system performance of the TDG used in various missions. Finally, it is concluded from the analysis and experiment described above that a fundamental concept of design and manufacture of the hardware of a noninteracting control system necessary for the development of future TDG's with excellent performance has been established.