{"refrec":{"BRefID":254580,"RR":"<b>Caresta, M.; Kessissoglou, N.J.</b> (2011). Reduction of hull-radiated noise using vibroacoustic optimization of the propulsion system. <i>J. Ship Res. 55(3)</i>: 149-162","BEntID":246585,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>J. Ship Res. 55(3)</i>: 149-162","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Caresta, M.; Kessissoglou, N.J.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Caresta, M.; Kessissoglou, N.J.","Englishabstract":"Vibration modes of a submarine are excited by fluctuating forces generated at the propeller and transmitted to the hull via the propeller-shafting system. The low frequency vibrational modes of the hull can result in significant sound radiation. This work investigates reduction of the far-field radiated sound pressure from a submarine using a resonance changer implemented in the propulsion system as well as design modifications to the propeller-shafting system attachment to the hull. The submarine hull is modeled as a fluid-loaded ring-stiffened cylindrical shell with truncated conical end caps. The propeller-shafting system is modeled in a modular approach using a combination of mass-spring-damper elements, beams, and shells. The stern end plate of the hull, to which the foundation of the propeller-shafting system is attached, is modeled as a circular plate coupled to an annular plate. The connection radius of the foundation to the stern end plate is shown to have a great influence on the structural and acoustic responses and is optimized in a given frequency range to reduce the radiated noise. Optimum connection radii for a range of cost functions based on the maximum radiated sound pressure are obtained for both simple support and clamped attachments of the foundation to the hull stern end plate. A hydraulic vibration attenuation device known as a resonance changer is implemented in the dynamic model of the propeller-shafting system. A combined genetic and pattern search algorithm was used to find the optimum virtual mass, stiffness, and damping parameters of the resonance changer. The use of a resonance changer in conjunction with an optimized connection radius is shown to give a significant reduction in the low frequency structure-borne radiated sound.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Reduction of hull-radiated noise using vibroacoustic optimization of the propulsion system","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"vibrations; noise; propuision; ship motions; loads","OtherDescriptors":null,"Notes":null,"AnaPub":2011,"MonPub":null,"DateUpdate":"2018-02-13","DateCreate":"2016-03-31","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000294313600001","VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":254580,"PubliDate":2011,"Pagination":"149-162","XtraPublOfAnaID":null,"ISBN":null,"Volume":"55","Issue":"3","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43265,"SerRR":"Journal of Ship Research. Society of Naval Architects and Marine Engineers: New York,.  ISSN 0022-4502; e-ISSN 1542-0604","StandardTitleSer":"Journal of Ship Research","ISSN":"0022-4502","AbbrevSer":"J. 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