70 C. Gardner et al. Fig. 6.13 Score profile for the DHEM Fig. 6.14 Score profile for the LLPD with 5 kHz low-pass filter 5 kHz, indicating the same conclusion from previous qualitative analysis: a pass band frequency of 20 kHz is more highly optimized than a pass band frequency of 5 kHz. 6.5.2 Experimental Comparisons The primary difficulty in evaluating the two features on experimental data is finding a comparable one-dimensional LDVscan line, akin to an ultrasonic B-scan. Assuming the physical coordinates of the transducer on the plate are known, radial paths emanating from this point (essentially, considering the surface in polar coordinates) are the most direct comparison to the unidirectional wave propagation modelled in Abaqus CAE. Using linear interpolation of the grid points scanned by
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