Chinese Journal of Mechanical Engineering

Table 4 Relative errors of three-parameter numerical test set for 10.15 mm thickness

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
Max (%)	0.55	0.097	0.96
Min (%)	− 0.23	− 0.11	− 0.26
RMS (%)	0.114	0.0387	0.148

Note: ANN structure: 501-100-100-3; activation function Tanh; 240 training samples, 60 test samples; loss=1.3 × 10⁻⁶

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