| 摘要 |
PURPOSE:To reduce the noise supplied from a cylindrical structure body by connecting and inserting the blocking masses on the sectional surface in the circumferential direction of the cylindrical structure body and attaching a vibration control member on the surface of a cylindrical structure body between the blocking mass and a vibration source. CONSTITUTION:Blocking masses 3 having the sectional thickness which is drastically different from the plate thickness of a windmill tower 2 are connected in an annular form and inserted, turning around the section of the windmill tower 2 as one example of a cylindrical structure body, and the inner surface of the cylindrical windmill tower 2 between the blocking mass 3 and a vibration source such as a mechanical device in the upper part is applied with the vibration control material 4 such as the epoxy material having the large damping effect. The blocking mass 3 cuts off the vibration transmitted to the inside of the windmill tower 2 from the vibration source such as the mechanical device in the upper part, in the middle part of the windmill tower 2. Further, the vibration control material 4 absorbs the vibration energy by the damping effect and can reduce the noise radiated from the whole of the windmill tower 2. |
