Table A2

Flexural wavelengths in longitudinal and radial directions for a back plate made in maple (EL = 9028 MPa, ER = 1679 MPa). The value of 1000 Hz is considered as a boundary frequency for material identification.

Eigenfrequency (Hz) Longitudinal λ (cm) Radial λ (cm)
97 58.12 14.38
164 45.07 11.14
274 35.33 8.74
294 34.01 8.41
340 31.92 7.90
420 28.90 7.15
1000 18.00 4.46

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