Effect of Thermal Cycling on Operational Characteristics and Lifetime Prediction of Space Pulse Tube Refrigerator

Table 3

Failure criterion of PTRs.

Prototype	Performance parameter	Case 1	Case 2	Case 3
Type A PTR	Input power increment (W)
	Cold-tip temperature difference (K)
	Conclusion	Operates well	Degradation	Failure
Type B PTR	Input power increment (W)			or
	Cold-tip temperature difference (K)
	Conclusion	Operates well	Degradation	Failure