Chinese Journal of Mechanical Engineering

Table 6 Relative error of four-parameter numerical test set

From: A Novel On-Site-Real-Time Method for Identifying Characteristic Parameters Using Ultrasonic Echo Groups and Neural Network

Relative error	Parameter class
Relative error	E	υ	ρ	h
Max (%)	1.17	0.54	1.40	0.44
Min (%)	−1.12	−0.39	−1.11	−0.67
RMS (%)	0.362	0.158	0.458	0.176

Note: ANN structure: 501-100-100-4; activation function Tanh; 240 training samples, 60 test samples; loss = 9 × 10⁻⁶

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