| 摘要 |
PROBLEM TO BE SOLVED: To suppress the structural resonance between the natural frequency in the rotating direction of a drive shaft and an aerodynamic vibration frequency applied to optical equipment by fully separating them by changing an inertial coefficient in the rotary direction of the drive shaft of the optical equipment. SOLUTION: The level of the natural frequency in the rotating direction of a drive shaft 4 is changed by adjusting the gain of a servo mechanism 7. However, during normal flight, the gain of the servo mechanism 7 is set to 0, and a controller 8 gives a gain change command to the servo mechanism 7 via a signal line 7 when the aerodynamic vibration direction being applied to optical equipment 2 approaches the frequency in the rotating direction of the drive shaft 4 at the gain 0 of the servo mechanism 7, thus fully separating the natural frequency in the rotating direction of the drive shaft 4 from the frequency of aerodynamic vibration being applied to the equipment 2 and hence avoiding the structural resonance between them, eliminating the peak value of a gain at the resonance frequency in the frequency characteristics of the control system of the drive motor 4 of the optical equipment 2, and preventing the oscillation of a signal near the resonance frequency.
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