00000nam 2200000zi 4500 9.943039 CaOODSP 20240919151117 m o d f cr bn||||||||| 240909e199003##nscd ob f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre D68-21/27-1990E-PDF Watt, G. D., author. Modelling submarine control surface deflection dynamics / George D. Watt ; approved by W.C.E. Nethercote. Dartmouth, N.S. : National Defence, Research and Development Branch, Defence Research Establishment Atlantic, March 1990. 1 online resource (iv, 18 pages) : graphs. text txt rdacontent computer c rdamedia online resource cr rdacarrier Technical memorandum ; 90/203 Digitized edition from print [produced by Defence Research and Development Canada]. Includes bibliographical references (page 16). "An algorithm is presented for modelling the time response of a lifting surface control system to an arbitrary set of commands. Response dynamics are governed by a linear, second order, ordinary differential equation. This allows the control system response frequency and damping to be modelled, as well as current control surface position and rate of change of position to be matched when a new command is issued. In order not to exceed the rate limit of the control system, yet maintain continuity in the response and its high order derivatives in time, the algorithm reduces response frequency when large deflection changes are required. This approach is compared to a common first order model, and to a second order model having piecewise continuous high order time derivates but which always models both response frequency and rate limit"--Abstract, page ii. Includes abstracts in English and French. Submarines (Ships) Hydrodynamics Mathematical models. Sous-marins Hydrodynamique Modèles mathématiques. Defence Research Establishment Atlantic, issuing body. D.R.E.A. technical memorandum ; 90/203. (CaOODSP)9.941838 PDF 827 KB https://publications.gc.ca/collections/collection_2024/rddc-drdc/D68-21-27-1990-eng.pdf