Presented at the 16th International Cryocooler Conference, held May 17-20, 2008 in Atlanta, Georgia.The dynamic pressure inside a Thermoacoustic Refrigerator (TAR) is an important parameter which governs the cold temperature and the cooling power. The present work aims to investigate the effect of two operating parameters: the resonant frequency and charging pressure on the dynamic pressure inside a TAR. A simple theoretical model is used to predict the behavior of dynamic pressure with charging pressure and resonant frequency. Experimental investigations have been carried out using a gas filled column driven by a moving coil loudspeaker. It has been observed that at small excitation levels, the results from theory and experiment closely match. Large deviations have been observed due to non linear effects at high excitation levels. One such non linear effect, periodic shocks, has been observed
