Hybrid coupling method to nonlinear acoustic source and linear duct system in compressor

In recent years, when consumers buy home appliances and cars, energy efficiency has been considered to be significant. Therefore, studies on how to increase the energy efficiency are being accelerated. A representative study is to raise the energy efficiency of the compressor which is a core part of the refrigerator using acoustic theory in suction part. However, the acoustic source characteristics in suction part of the compressor are the nonlinear and time-varying. While the acoustic propagation characteristics of suction muffler are the linear and time-invariant. Thus, couplings between the source represented in the time domain and wave propagation represented in the frequency domain are not easy. In this study, we showed how to effectively coupling. That is, in the frequency domain, the input impedance of muffler was measured. Then, the impedance changes to state space form using modal method. And a state space model is coupled to the acoustic source model in the time domain. This approach was verified through the experiment with speaker model