Approximately Linear Low-Pass Wave Filters

by William James, (A.M.ASCE), Assoc. Prof.; Civ. Engrg. and Engrg. Mech., McMaster Univ., Hamilton, ON, Canada,

Serial Information: Journal of the Waterways, Harbors and Coastal Engineering Division, 1973, Vol. 99, Issue 1, Pg. 59-68

Document Type: Journal Paper


Tests were conducted on an inexpensive low-pass filter comprising parallel sheets of fiber glass gauze. In these tests a spectral wave generator was used and transmissivity was measured: (1) for a range of low amplitude monoperiodic waves and (2) for various combinations of amplitudes of two of these wave frequencies. The results indicate linearity (approximately 5% scatter) and little or no interaction. From these results an empirical transfer function has been derived and transmissivity computed and plotted for a flat spectrum and a peaked (Bretschneider) spectrum for various filter lengths. An attempt is made to generalize the results (from wall attenuation experiments) and the effect of various filter densities is inferred for the flat spectrum. Plotted results are presented to allow a quick estimate for an economic filter design.

Subject Headings: Wave generation | Wave spectrum | Linear functions | Filters | Sheets | Fiber reinforced polymer | Fabrics | Glass

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