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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Schuler tuning ： ウィキペディア英語版 Schuler tuning Schuler tuning is a modification to the electronic control system used in inertial navigation systems that accounts for the curvature of the Earth. An inertial navigation system, used in submarines, ships, aircraft, and other vehicles to keep track of position, determines directions with respect to three axes pointing "north", "east", and "down". To detect the vehicle's orientation, the system contains an "inertial platform" mounted on gimbals, with gyroscopes that keep it pointing in a fixed orientation in space. However, the directions "north", "east" and "down" change as the vehicle moves on the curved surface of the Earth. Schuler tuning describes the modifications necessary to an inertial navigation system to keep the inertial platform always pointing "north", "east" and "down", so it gives correct directions on Earth. ==Principle== As first explained by German engineer Maximilian Schuler in a 1923 paper, a pendulum whose period exactly equals the orbital period of a hypothetical satellite orbiting just above the surface of the Earth (about 84 minutes) will tend to remain pointing at the center of the Earth when its support is suddenly displaced. Such a pendulum would have a length equal to the radius of the Earth. Consider a simple gravity pendulum, whose length equals the radius of the Earth, suspended in a uniform gravitational field of the same strength as that experienced at the Earth's surface. If suspended from the surface of the Earth, the bob of the pendulum would be at the center of the Earth. If it is hanging motionless and its support is moved sideways, the bob tends to remain motionless, so the pendulum always points at the center of the Earth. If such a pendulum were attached to the inertial platform of an inertial navigation system, the platform would remain level, facing "north", "east" and "down", as it was moved about on the surface of the Earth. A rigid pendulum may also be made to have the required period, with a pivot near its center of gravity.〔(Schuler Pendulum ) by Robert H. Cannon, Accessscience.com〕 The Schuler period can be derived from the classic formula for the period of a pendulum: :$T\; =\; 2\backslash pi\; \backslash sqrt\backslash frac\; \backslash approx\; 2\backslash pi\; \backslash sqrt\backslash frac\; \backslash approx\; 5066\; \backslash \; \backslash text\; \backslash approx\; 84.4\; \backslash \; \backslash text$ where ''L'' is the radius of the earth in meters and ''g'' is the local acceleration of gravity in metres per second per second. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Schuler tuning」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.