In a piano-making, the soundboards tradionally have been made of the wood of Sitka spruce (Picea sitchensis Carr.). Recently, the wood of Agathis(Agathis alba Foxw.) has been developed and used for piano soundboards also, because of its cheap price. To clarify the characteristics of Agathls wood used in making a piano in Indonesia, we measured the the acoustic and mechanical properties of longitudinal direction strips cut from Agathis (from Indonesia) and Sitka spruce woods. The mean values of density of Agathis and Sitka spruce were 0.445 and 0.413, respectively, and the values of Agathis were distributed more widly than those of Sitka spruce. The values of dynamic modulus of elasticiy(Ed) increased with increasing density in Sitka spruce, where as the values of Agathis were distributed much more widly than those of Sitka spruce and there was not significient at 5 % Ievel between Ed and densin in Agathis. Internal fuction was found not to be related to density in both species. The mean values of acoustic converting efficiencies (√E/o³/Q-¹ ) or (1/√ pE X Q-¹) of Agathis were lower than those of Sitka spruce. These results show that the acoustic properties of Agathis were not better than those of Sitka spruce. So we need to select and use a good quality wood in using Agathis for piano soundboards.
1. 서론
2. 재료 및 방법
3. 결과 및 고찰
4. 결론
5. 참고문헌