2004 Volume 47 Issue 1 Pages 42-46
Acoustic intensity is usually estimated from the cross-spectrum of acoustic pressures measured by two adjacent microphones. The cross-spectrum, calculated by the digital Fourier transform technique, has unavoidable leakage error because the signal period does not usually coincide with the record length. Therefore, acoustic intensity, estimated by a conventional FFT analyzer, has distorted values. In our research, the expression of Fourier-transformed data of a harmonic signal with a single frequency was formulated when there was leakage error. A method to eliminate the effect of leakage error from contaminated data was also investigated. Some numerical examples show the validation of the proposed method.
JSME international journal. Ser. 1, Solid mechanics, strength of materials
JSME international journal. Ser. A, Mechanics and material engineering
JSME international journal. Ser. 3, Vibration, control engineering, engineering for industry
JSME international journal. Ser. C, Dynamics, control, robotics, design and manufacturing