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Statements

Subject Item
dbr:Rotational–vibrational_coupling
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Acoplamento rotacional-vibracional Rotational–vibrational coupling 轉動-振動耦合
rdfs:comment
旋转振联（Rotational–vibrational_coupling）发生在一物体的转动频率接近其自然共振频率时。例如二個以彈簧相連的物體，以其質心為圓心旋轉，同時彈簧本身週期性延展及壓縮，就可能會有旋转振联的情形。 在旋转振联中，會出現角速度的振荡。当弹簧施加的力使得转动的物质靠近转动中心時，弹簧弹力（向心力）做功，使得储存在弹簧中的应变能转化为物质的动能。因此，角速度会增加。该弹簧施加的力不会一直将转动物质拉近旋转中心。旋转物质靠旋转中心越近，弹簧施加的弹力越弱，物体的速度也在增加。在某一点的物体的速度增加足够多以至于物体开始再次摆动，进入储存应变能的阶段。 在 直升機的设计中必须包含减震装置，因为在特定的角度，旋转振联会引起螺旋桨的速度振动，如果没有减振装置，振动会引起螺旋桨松动，从而导致灾难的发生。 O acoplamento rotacional-vibracional ocorre quando a frequência de rotação de um objeto está perto ou é idêntica a uma frequência natural de vibração interna. O acoplamento de sistemas vibratórios de dois (ou mais), por exemplo pêndulos ou circuitos ressonantes, por meio de molas ou de campos magnéticos, etc. O que é característico para uma oscilação acoplada é o efeito de batimento In physics, rotational–vibrational coupling occurs when the rotation frequency of a system is close to or identical to a natural internal vibration frequency. The animation on the right shows ideal motion, with the force exerted by the spring and the distance from the center of rotation increasing together linearly with no friction.
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1105510751
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dbo:abstract
旋转振联（Rotational–vibrational_coupling）发生在一物体的转动频率接近其自然共振频率时。例如二個以彈簧相連的物體，以其質心為圓心旋轉，同時彈簧本身週期性延展及壓縮，就可能會有旋转振联的情形。 在旋转振联中，會出現角速度的振荡。当弹簧施加的力使得转动的物质靠近转动中心時，弹簧弹力（向心力）做功，使得储存在弹簧中的应变能转化为物质的动能。因此，角速度会增加。该弹簧施加的力不会一直将转动物质拉近旋转中心。旋转物质靠旋转中心越近，弹簧施加的弹力越弱，物体的速度也在增加。在某一点的物体的速度增加足够多以至于物体开始再次摆动，进入储存应变能的阶段。 在 直升機的设计中必须包含减震装置，因为在特定的角度，旋转振联会引起螺旋桨的速度振动，如果没有减振装置，振动会引起螺旋桨松动，从而导致灾难的发生。 O acoplamento rotacional-vibracional ocorre quando a frequência de rotação de um objeto está perto ou é idêntica a uma frequência natural de vibração interna. O acoplamento de sistemas vibratórios de dois (ou mais), por exemplo pêndulos ou circuitos ressonantes, por meio de molas ou de campos magnéticos, etc. O que é característico para uma oscilação acoplada é o efeito de batimento In physics, rotational–vibrational coupling occurs when the rotation frequency of a system is close to or identical to a natural internal vibration frequency. The animation on the right shows ideal motion, with the force exerted by the spring and the distance from the center of rotation increasing together linearly with no friction. In rotational-vibrational coupling, angular velocity oscillates. By pulling the circling masses closer together, the spring transfers its stored strain energy into the kinetic energy of the circling masses, increasing their angular velocity. The spring cannot bring the circling masses together, since the spring's pull weakens as the circling masses approach. At some point, the increasing angular velocity of the circling masses overcomes the pull of the spring, causing the circling masses to increasingly distance themselves. This increasingly strains the spring, strengthening its pull and causing the circling masses to transfer their kinetic energy into the spring's strain energy, thereby decreasing the circling masses' angular velocity. At some point, the pull of the spring overcomes the angular velocity of the circling masses, restarting the cycle. In helicopter design, helicopters must incorporate damping devices, because at specific angular velocities, the rotorblade vibrations can reinforced themselves by rotational-vibrational coupling, and build up catastrophically. Without damping, these vibrations would cause the rotorblades to break loose.
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