本研究探杉木(Cunninghamia lanceolata Lamb. )、台灣杉(Taiwania cryptomerioides)、北美鐵杉(Tsuga Spp. )為試材,以振動試驗探討金屬支點及支點上放置橡皮時之振動特性,測定支點材質對共振頻率及對數衰減率之影響,同時並進行衝擊彎曲試驗,探討支點及荷重點附加橡皮時對衝擊吸收能量之影響。結果顯示振動試驗時支點墊橡皮其損失正切較未墊橡皮者約增加一倍,顯示在支點上放置橡皮可使木材振動時之衰減加速,具防振及吸音之效果;而衝擊試驗時於支點墊橡皮其衝擊吸收能量約增加12%,荷重點墊橡皮則無明顯效果,顯示在支點上放置橡皮,由於柔性支點可吸收振動能量因而產生抗振效果,此可作為結構設計上防振及吸音之參考。
Two tests were used in this study. The experimental materials included hemlock, taiwania and China-fir. In the vibration test, the influence of different supporting material on the resonant frequency and logarithmic decrement was studied. In the impact bending test, the effect of different supporting material and loading head on the impact absorbed energy of hemlock was discussed. The experimental results were summarized as follows: 1. In the vibration test, the loss tangent increased about 100% for the rubber cushioned metal support. 2. In the impact test, the impact absorbed energy increased about 12% for the rubber cushioned metal support. But there was no significant effect on the loading head cushioned with rubber. 3. The conclusion was that the rubber cushioned metal support could accelerate the damping on the vibration, and the flexible support could absorb the vibration energy. It seemed that it was suitable for vibration resistance and sound absorption. These characteristics could be applied to the design of construction in terms of vibration and sound absorption.
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