In the refrigerator compressors, the suction mufflers are commonly used to reduce the noise propagated through the intake valve system. In order to optimize the muffler design, it is necessary to characterize the source characteristics, i.e., the sour...
In the refrigerator compressors, the suction mufflers are commonly used to reduce the noise propagated through the intake valve system. In order to optimize the muffler design, it is necessary to characterize the source characteristics, i.e., the source impedance and the strength, of the intake system. In this paper, assuming the intake system as one-port, linear, time-invariant one, the acoustic source at the intake port of the actually operating compressor is estimated by using the multiple-microphone method. In the present method, an overdetermined linear system which contains two transfer functions between two pairs among three sensors is solved using the Moor-Penrose pseudo-inverse. The obtained source parameters are successfully used to predict the radiated source pressure at the intake system in the compressor.