Acoustic vibration properties of wood for musical instrument based on FFT of adding windows

摘要

The object of this study was to understand precisely the acoustic vibration characteristics of the paulownia for musical instrument. Two paulownia chosen were Paulownia australis and Paulownia elongata, and compared with the picea (Far East Picea koraiensis and Picea jezoensis). The acoustic vibration parameters of four trees were respectively measured and comparative analyzed based on the vibration method of FFT by tapping, and then the acoustic vibration characteristics of paulownia were comprehensive evaluated. The results demonstrated that the density had nearly no effect on the loss angle tangents of the paulownia and the picea, and the loss angle tangents of four trees were similar. At the same time, the values of the specific Young's modulus and acoustic impedance of the paulownia were smaller than that of the picea, but the paulownia's acoustic radiation constants and the loudness were larger and higher than the picea's. It indicated that, according to all acoustic vibration parameters evaluated, the paulownia had the same good acoustic vibration characteristics with the picea, and the paulownia was suitable for wood for musical instrument.