| 摘要 |
PURPOSE:To stop the vibration of a hull, i.e. a structure, which is subjected to the vibration, by providing a weight on the support lever in the form of a long rod which is cantilever-mounted to the vibrated structure, such weight being allowed to move in response to the change in frequency of the vibration of the vibrated structure. CONSTITUTION:The support lever 3 in the form of the long rod which is cantilever-mounted to a hull 1 is attached in a flexible manner at its one end in the pre-determined position through a support bracket 4, and a spring 5 is installed in-between the hull 1 to allow the support lever 3 to vibrate. The weight 6 which is mounted on the support lever 3 and is capable of changing its natural frequency k2 in response to the change in the distance from the point of support is moved by a motor 7 through a screw thread mechanism. The frequency omega of the vibration coming from an engine 2 is detected by an accelerometer 8. Based on the frequency detected by the accelerometer 8, a control device 9 operates the motor 7 to move the weight 6 so k2=omega. As a result, the vibration of the vibrated structure can be stopped. |
