| 摘要 |
PURPOSE:To shorten the time required before a gyro spin shaft direct to the north and is statically determined after a gyro is started, and to avoid an unnecessary operation when a vessel is at anchor by increasing the gain of a differential operating part and shortening a period of a precession of the gyro spin shaft, before sailing of a vessel, and decreasing the gain and setting it to a period of a necessary precession at the time of navigation. CONSTITUTION:A gyro 12 is rotated. When a gyro spin shaft 5 is inclined from a horizontal surface 9 of the earth in a state that the gyro 12 is rotated at a high speed, its inclined angle beta is detected as an electrical signal by an inclined angle detector 6. This inclined angle signal is feeble, therefore, it is amplified, and proportional and differential operations are executed by a proportional and differential operating part 18, and its output is inputted to a torque motor 8. A torque being proportional to inputted voltage is applied to a vertical frame 3, and the gyro spin shaft 5 executes a precession. As for this precession, a torque of the same phase and a control torque which leads by a phase angle of 90 deg. are applied, therefore, it is attenuated gradually without executing a sustained oscillation-like motion, and the gyro spin shaft 5 is directed to the due north and statically determined. |
