Thermoacoustic-driven pulse tube refrigerators are usually coupled directly or by long tubes called acoustic amplifiers. With these coupling methods

the efficiency of the whole system is quite low because of the nonideal acoustic field and flow losses. This paper describes a new thermoacoustic-driven pulse tube refrigerator that can reduce the transmission loss of sound power and improve efficiency using a mechanical resonator to couple the thermoacoustic engine and pulse tube refrigerator. Theoretical analysis is carried out for a heating temperature of 900 K and cooling temperature of 80 K. First

the coupling mechanism of the resonator is analyzed and the parameters of the mechanical resonator are optimized. Second

the influence of the heating temperature

cooling temperature

and mechanical resistance are investigated. Furthermore

the proposed method is compared with the traditional coupling configuration. The results show that the thermoacoustic-driven refrigerator with mechanical resonance attains an exergy efficiency of 22.5%

whereas the long-tube-coupled thermoacoustic-driven pulse tube refrigerator only reaches an exergy efficiency of 11.6%.