The aeroacoustic properties of the wing mirror could also be studied through plotting the surface acoustic power levels on the wing mirror (Figure 14)
Figure 14 - Contours of Surface Acoustic Power Level (dB) at 60mph
From the plots it could be seen that the highest sources of noise were present at areas of sharp changes in surface curvature, such as at the edges of the wing mirror mount, at the stepped faces on the wing mirror’s underside (also a region of high static pressure) and the trim around the mirror casing; as shown by the red ring-like feature on the wing mirror.
With the performance assessment of the wing mirror complete, efforts to improve the design could be carried out. The first design changes applied would be to alter the shape of the wing mount with the intent of lowering the wing mirror’s drag. If successful this optimized design would then be further altered through smoothing any sharp changes in surface curvature, with the aim of decreasing the amount of high acoustic power level sources on the wing mirror surfaces.
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