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The theory for the irregular nonlinear wave model is integrated into a motion prediction model to simulate the falling process of a dropped cylinder under irregular waves. Through frequency analysis, the simulated irregular waves are transformed into wave spectrum by fast Fourier transform and compared with the target wave spectrum. A good agreement between simulated wave spectrum and target wave spectrum indicates the validity of the irregular nonlinear wave model. The effects of cylinder mass density, wave amplitude and initial wave phase on the trajectory and terminal conditions of dropped cylindrical object are systematically investigated, and the simulated results are compared with those induced by regular waves. <\/jats:p>","DOI":"10.1177\/1475090218825170","type":"journal-article","created":{"date-parts":[[2019,2,9]],"date-time":"2019-02-09T06:59:40Z","timestamp":1549695580000},"page":"272-283","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":1,"title":["Incorporating irregular nonlinear waves in simulation of dropped cylindrical objects"],"prefix":"10.1177","volume":"234","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6639-272X","authenticated-orcid":false,"given":"Gong","family":"Xiang","sequence":"first","affiliation":[{"name":"Centre for Marine Technology and Ocean Engineering (CENTEC), Instituto Superior Tecnico, Universidade de Lisboa, Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8570-4263","authenticated-orcid":false,"given":"C.","family":"Guedes Soares","sequence":"additional","affiliation":[{"name":"Centre for Marine Technology and Ocean Engineering (CENTEC), Instituto Superior Tecnico, Universidade de Lisboa, Lisboa, Portugal"}]}],"member":"179","published-online":{"date-parts":[[2019,2,8]]},"reference":[{"first-page":"21","volume-title":"17th international workshop on water waves and floating bodies (IWWWFB)","author":"Kim Y","key":"bibr1-1475090218825170"},{"key":"bibr2-1475090218825170","doi-asserted-by":"publisher","DOI":"10.1016\/j.expthermflusci.2004.08.001"},{"volume-title":"18th international workshop on water waves and floating bodies (IWWWFB)","author":"Friedman A","key":"bibr3-1475090218825170"},{"volume-title":"Proceedings of the 23rd international offshore and polar engineering conference","author":"Majed A","key":"bibr4-1475090218825170"},{"key":"bibr5-1475090218825170","doi-asserted-by":"publisher","DOI":"10.3723\/ut.32.177"},{"volume-title":"SPIE 9302, international conference on experimental mechanics","author":"Lyu XJ","key":"bibr6-1475090218825170"},{"key":"bibr7-1475090218825170","doi-asserted-by":"publisher","DOI":"10.12989\/ose.2016.6.4.377"},{"key":"bibr8-1475090218825170","doi-asserted-by":"publisher","DOI":"10.17736\/ijope.2017.sh17"},{"key":"bibr9-1475090218825170","doi-asserted-by":"publisher","DOI":"10.1177\/1475090216642465"},{"key":"bibr10-1475090218825170","doi-asserted-by":"publisher","DOI":"10.7551\/mitpress\/4443.001.0001"},{"volume-title":"19th annual offshore technology conference","author":"Aanesland V","key":"bibr11-1475090218825170"},{"key":"bibr12-1475090218825170","doi-asserted-by":"publisher","DOI":"10.1016\/j.oceaneng.2016.11.060"},{"key":"bibr13-1475090218825170","first-page":"481","volume":"230","author":"Enayati J","year":"2015","journal-title":"Proc IMechE, Part M: J Engineering for the Maritime Environment"},{"first-page":"1","volume-title":"Performance flight testing","author":"Beeker GL","key":"bibr14-1475090218825170"},{"key":"bibr15-1475090218825170","first-page":"149","volume":"189","author":"Morison JR","year":"1950","journal-title":"Petrol Trans AIME"},{"key":"bibr16-1475090218825170","unstructured":"Glenn Research Center. 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