简介:在水下的声学的散布回应时间空间组织并且及时是aliasing并且频率领域。当事件角度是未知的时,回响性质的不同系列没被识别。这篇文章在monostatic声纳的目标回响调查变化处理这个问题。有类似的结构的母亲小浪用匹配的过滤器,和在延期因素之间的理论表达式根据预处理信号波形被建议了,事件角度在小浪域被导出。在这个方法能有效地分开几何散布的免费地的水池表演的模拟数据和试验性的结果的分析目标回响的部件。在一个单个角度从几何回响获得的时间延期评价与一致指向几何特征,没有角度信息,它为目标识别提供一个基础。调查结果为分析在实际海洋环境散布回响的橡皮提供珍贵卓见。
简介:ResistanceanalysisisanimportantanalyticalmethodusedtoevaluatethehydrodynamicperformanceofHighSpeedCraft(HSC).AnalysisofmultihullresistanceinshallowwaterisessentialtotheperformanceevaluationofanytypeofHSC.Shipsoperatinginshallowwaterexperienceincreasesinresistancebecauseofchangesinpressuredistributionandwavepattern.Inthispaper,theshallowwaterperformanceofanHSCdesignconcept,thesemi-SmallWaterplaneAreaTwinHull(semi-SWATH)form,isstudied.Thehullisinstalledwithfinstabilizerstoreducedynamicmotioneffects,andtheresistancecomponentsofthehull,hulltrimcondition,andmaximumwaveamplitudearoundthehullaredeterminedviacalmwaterresistancetestsinshallowwater.Thesecriteriaareimportantinanalyzingsemi-SWATHresistanceinshallowwateranditsrelationtoflowaroundhull.Theforefinangleisfixedtozerodegrees,whiletheaftfinangleisvariedto0o,5o,10o,and15o.Foreachconfiguration,investigationsareconductedwithdepthFroudenumbers(FrH)rangingfrom0.65to1.2,andtheresistancetestsareperformedinshallowwateratthetowingtankofUTM.Analysisresultsindicatethattheresistance,wavepattern,andtrimofthesemi-SWATHhullformareaffectedbythefinangle.Theresistanceisamplifiedwhereasthetrimandsinkagearereducedasthefinangleincreases.IncreasesinfinanglecontributetoseakeepingandstabilitybutaffectthehullresistanceofHSCs.