00000nam 2200000zi 4500 9.943042 CaOODSP 20240920104654 m o d f cr bn||||||||| 240909e199108##nscd ob f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre D68-21/29-1991E-PDF Graham, Ross, author. Second-order analysis of roll decay tests / Ross Graham - Andrew Webber ; approved by R.T. Schmitke. Dartmouth, N.S. : National Defence, Research and Development Branch, Defence Research Establishment Atlantic, August 1991. 1 online resource (v, 16 pages) : graphs. text txt rdacontent computer c rdamedia online resource cr rdacarrier Technical memorandum ; 91/211 Digitized edition from print [produced by Defence Research and Development Canada]. Includes bibliographical references (page 13). "A method for determining linear plus quadratic roll damping coefficients from roll decay tests that is believed to be accurate up to second order in the damping coefficients is described. Two computer programs are developed to estimate roll decay coefficients via chi-square fitting using first-order and second order analyses. The methods are applied to measured and simulated roll decay data, and excellent results are obtained with both codes. While the second-order results represent an improvement in both goodness-of-fit and accuracy compared with the first-order results, the latter are already so good that the improvement is considered to be of limited practical significance"--Abstract, page ii. Includes abstracts in English and French. Ships Maneuverability Measurement. Stability of ships Computer programs. Navires Manœuvrabilité Mesure. Navires Stabilité Logiciels. Defence Research Establishment Atlantic, issuing body. D.R.E.A. technical memorandum ; 91/211. (CaOODSP)9.941838 PDF 637 KB https://publications.gc.ca/collections/collection_2024/rddc-drdc/D68-21-29-1991-eng.pdf