Noninteracting control of dynamically tuned dry gyro
Abstract
A new design concept of a rebalance control circuit useful both for the improvement of response characteristics and the removal of interaction is desribed. It is shown that an interaction between input and output of Tuned Dry Gyro (TDG) is caused by angular acceleration. A Direct Rebalance Loop (DRL), which is an additional circuit, has been developed, and its utility evaluated quantitatively by simulation. It is shown, as an example of response characterstics improvement by DRL, that larger amplifier gain can be adopted under stable conditions, and that settling time and overshoot decrease remarkably. However, it is also found that DRL is ineffective in reducing interaction. In order to resolve the problems, a method of reducing such interaction by using subtorquers with the main torquers is proposed. The transfer function of the loop between the signal generator and the subtorquer (NIL) is derived analytically so as to remove the interaction. Next, it is examined to see what degree of interaction can be removed by the use of NIL, and as an instance of numerical simulation, it is shown that the interaction can be reduced by less than one tenth at input frequencies of 0 to 40 Hz. Finally, it is concluded that a fundamental design concept of a noninteracting control has been established.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- 1985
- Bibcode:
- 1985STIN...8619584S
- Keywords:
-
- Controllers;
- Dynamic Characteristics;
- Gyroscopes;
- Integrated Circuits;
- Tuning;
- Control Systems Design;
- Feedback Control;
- Signal Generators;
- Transfer Functions;
- Instrumentation and Photography