Fig. 5
From: Near field effect on elasticity measurement for cartilage-bone structure using Lamb wave method
Numerical LWM results for the cartilage-bone structure: a, c velocity field of wave propagating and b, d the 2D FFT results. The wave speeds were estimated by dividing the frequency and wavenumber at the peak energy \(\left( {{\text{c}} = \uplambda {\text{f}} = {\text{f}}/{\text{k}}} \right).\) a, b Loading frequency 2000 Hz, estimated wave speed 28 m/s; c, d loading frequency 600 Hz, estimated wave speed unknown