Restoring force - Restoring force

Japanese: 復原力 - ふくげんりょく

Generally, it refers to the force that tries to return an object that has moved from a balanced position to its original position, but it often refers to the force that resists when a ship standing upright on the water is gently tilted, or the force that tries to return the ship to its original position after being tilted. When a ship is stationary, the center of gravity and the center of buoyancy (called the center of buoyancy) are on the same vertical line, and gravity and buoyancy are in balance. If the ship tilts slightly, the center of gravity does not change, but the center of buoyancy moves, and the two are no longer on the same vertical line, and the couple of gravity and buoyancy acts to rotate the ship. In this case, the intersection of the vertical line passing through the center of buoyancy and the centerline of the hull is called the metacenter, and if the center of gravity is below the metacenter, this couple acts as a righting force for the ship. If the center of gravity is high and above the metacenter, this couple tries to tilt the ship even more. The distance between the metacenter and the center of gravity is called the metacenter height, and the magnitude of the restoring force is determined by this. Heavy-headed ships with a small metacenter height have small restoring force, while light-headed ships with a large metacenter height, such as ships with a light top or wide width, have large restoring force.
→ Related topics Center of buoyancy

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

一般にはつり合いの位置から動いた物体を元の位置に戻そうとする力のことだが，水上で直立している船を静かに傾けようとするとき，これに抵抗する力，または傾けられた位置から元へ戻ろうとする力を指す場合が多い。船が静止しているときは，重心と浮力の中心（浮心という）とは同一鉛直線上にあって，重力と浮力はつり合っている。少し傾くと重心は変わらないが浮心は移動し，両者は同一鉛直線上になく，重力と浮力による偶力は船を回転させるように働く。このとき浮力中心を通る鉛直線と船体中心線との交点をメタセンターといい，重心がメタセンターより下にあれば，この偶力は船の復原力となる。重心が高くメタセンターより上にあれば，この偶力は船をますます傾けようとする。メタセンターと重心との距離をメタセンター高さといい，復原力の大きさはこれによって定まり，メタセンター高さの小さい重頭船は復原力が小さく，上部の軽い船，幅の広い船などメタセンター高さの大きい軽頭船は復原力が大きい。
→関連項目浮力中心

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