00000nam 2200000zi 4500 9.943040 CaOODSP 20240919152649 m o d f cr bn||||||||| 240909e199012##nscd ob f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre ln----- D68-21/28-1990E-PDF Chapman, David M. F., 1953- author. Synthetic ocean waveforms for testing sonobuoy suspensions / David M. F. Chapman ; approved by P. Bhartia. Dartmouth, N.S. : National Defence, Research and Development Branch, Defence Research Establishment Atlantic, December 1990. 1 online resource (iv, 20 pages) : graphs. text txt rdacontent computer c rdamedia online resource cr rdacarrier Technical memorandum ; 90/209 Digitized edition from print [produced by Defence Research and Development Canada]. Includes bibliographical references (page 15). "Four synthetic ocean waveforms are proposed for the testing of sonobuoy suspensions. They are based on the Bretschneider ocean wave spectrum, with significant waveheights chosen from the sea state code of the World Meteorological Organization (WMO) and corresponding peak periods based on statistical data from the Canadian North Atlantic Ocean in winter conditions. The waveforms are presented as sums of 20 sine-wave components of specified frequency, amplitude, and phase. There is one waveform each for WMO sea states 3, 4, 5, and 6, corresponding to significant waveheights of 1.25 m, 2.5 m, 4 m, and 6 m, respectively; the associated peak periods are 9 s, 10 s, 12 s, and 14 s, respectively. The maximum and minimum frequencies for each waveform are chosen to bracket 98% of the wave energy. All the information required to generate the waveforms is provided; waveform plots and numerical values at 0.5 s intervals are included for checking purposes"--Abstract, page ii. Includes abstracts in English and French. Oceanographic buoys North Atlantic Ocean. Ocean waves North Atlantic Ocean Measurement. Bouées océanographiques Atlantique Nord. Vagues Atlantique Nord Mesure. Defence Research Establishment Atlantic, issuing body. D.R.E.A. technical memorandum ; 90/209. (CaOODSP)9.941838 PDF 1,017 KB https://publications.gc.ca/collections/collection_2024/rddc-drdc/D68-21-28-1990-eng.pdf