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木材の自由振動の減衰を大気圧のもと、および約20mmHgの減圧のもとで測定し、振動数(ほぼ25～1200Hz)が減衰に与える影響を検討した。さらに、木材の減衰を金属やプラスチックの減衰と比較した。木材の自由振動時における時間経過による振幅の減少には、測定した振動数範囲の低い振動数域ではクローン摩擦および粘性の両者が関与し、振動数が増加するにつれて粘性が主体となることが明らかとなった。なお、木材の内...部に存在するクローン摩擦は、振動数が減少するにつれて増大する傾向がある。
The damping mechanism of vibration in wood is investigated using the results of free transverse vibration tests. The tests were conducted under the atmospheric conditions of one atmospheric pressure and a reduced pressure(20mmHg), for various frequencies of vibration ranging from 25 Hz to 1200 Hz. The test specimens were prepared from Ezomatsu-wood (Picea jzoensis Carr.). The effects of frequency on the damping characteristics are mainly discussed. In addition, the damping characteristics of wood are compared with that of metals and plastic (alloy steel, aluminum, and polycarbonate). Main results obtained from the investigation are as follows: 1) Within the low frequency range, the damping characteristics of wood depend both on Coulom's friction and the viscosity. As the frequency increases, the dependence on the viscosity becomes superior. 2) Coulomb's friction increases with the decrease of frequency. 3) Under the atomospheric pressure, the damping characteristics of wood are considerably affected by the resistance of air, within the low frequency range.show more
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木材学会誌19(8)