Research On Motion Of Trimaran Planing Hull In Regular Wave

Trimaran planing hull is a new offshoot of high-powered planing hull. At abroad,ramifications of trimaran planing hull cut a figure in military field and civilian field, such asM ship, high-seakeeping trimaran planing hull, high-load trimaran planing hull, high-speedtrimaran planning hull, and trimaran dispel-wave planing hull also comes out athome.research on motion of trimaran planing hull in regular wave explores integratedcapability of trimaran planing hull, and provides theoretic and experimental evidence forfarther research.The paper analyzed experimental data of trimaran planing hull in regular wave whichexperimentized in Dalian University of Technology and included smooth water rollingexperimentation, zero speed experimentation in transverse wave and navigate speedexperimentation in longitudinal wave, got motion response of trimaran planing hull in wave.The paper evaluated“ЦАГИ”method equation by secant method and got smooth waternavigational state; validated navigational state of trimaran planing hull in smooth water andwave which is much at one by experimental data; three-dimensionally modeled by solid edgeand expressed underwater bulk change of trimaran planing hull as navigational state change.The longitudinal motion equation of high-speed planing hull was introduced, which includesthe effects of configuration of craft at navigation, the planing lift and the planing lift moment;Three calculation methods-the full displacement method which ignores the changs ofconfiguration of craft at navigation, the floating method which only includes the effects ofconfiguration of craft at navigation and the planing method which includes the effects ofconfiguration of craft at navgation, planing lift and planing lift moment-were compared withmotion prediction of trimaran planing hull in wave, the result of full displacement methodaccords well with both trendline and numerical value,this shows that full displacementmethod still is the most credible calculation method. At last, the paper used experimental dataof trimaran planing hull in regular wave whose time range is2.1s to predict short-time motionof trimaran planing hull by model ARMA, model ARMA is doable in predict short-timemotion of trimaran planing hull,but error will increase with steps increasing,predict precisionsgradually decrease.