スクロール圧縮機の脈動騒音予測と発生メカニズムに関する研究(流体工学,流体機械)

In authors' previous works, the new one-dimensional model was proposed to simulate the scroll discharge pressure pulsation, and the estimation of the frequency spectrum for the pulsation noise was made possible. In this study, the Gabor wavelet transform was applied to the pressure pulsation signal simulated by the one-dimensional model in order to specify the time and position of the large noise generation for the scroll compressor. It was found that the absolute value of wavelet coefficient shows the peek around 800 Hz-1.5 kHz at the rotation angle Θ=150°, which corresponds to the phase that the discharge port just starts opening. The experimental measurements of the acceleration of vibration of the scroll compressor have been also performed. It is shown that the measurement result is consistent with the wavelet analysis for the simulated pressure pulsation signal. So it is confirmed that the present model and wavelet analysis are useful to the prediction of the pressure pulsation noise and its generation mechanism in scroll compressor.