Chinese Journal of Mechanical Engineering

Table 2 Classification of major research of the ultrasonic method

From: Research Review of Principles and Methods for Ultrasonic Measurement of Axial Stress in Bolts

Method	Classification	References
The mono-wave method	Theoretical research	[1, 15,16,17,18,19,20,21, 24,25,26,27, 53]
The mono-wave method	Equipment development	[11, 13, 14, 22, 23, 28,29,30,31,32,33]
The bi-wave method	Theoretical research	[6, 34, 35, 37, 40,41,42, 44, 46,47,48,49, 54]
The bi-wave method	Equipment development	[36, 38, 39, 43, 45, 50,51,52]

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