抄録
Discussed are methods of controlling phase difference between oscillations of pressure and displacement at the hot end of a pulse-tube. Electric analogs of fluid mechanical system are discussed in the beginning and fluid mechanical components corresponding to capacitance, inductance and resistance in electric circuits are clarified. In the next the phase difference is discussed in terms of equivalent circuit-network. The moving-plug type by Y. Matsubara and A. Miyake is shown to belong to the third generation of pulse-tube refrigerator. The double-inlet one by S. Zhu et al. belongs possibly to the third generation. A differential pulse-tube refrigerator with a free-piston is proposed.
