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简介：Byusingthemodernlydevelopedtechniquesofpossibilityandset-valuedstatistics,thispaperdeter-minedthethresholdsofvariouscategoriesofnoiseannoyanceanddefinedthedose-responserelationbe-tweenthelevelsofnoiseandtheirannoyance.Threefactorscontrolledintheexperimentweretypesofnoise:impulseandtraffic;levelofnoise:5Leqfrom45—85dB（A）;andperformancetask:withandwithoutspeechrecognition.NoiseinterferencewithspeechrecognitionwasmeasuredwiththeSDTmethod.Ourex-perimentalresultsshowedthatLeqofimpulsenoiseshouldbehigherthanthatoftrafficnoisetogetequalannoyance;thespeechrecognitiontaskmightlightentheexperienceofannoyance;thehigherthelevelofnoise,themoreitsinterferencewiththespeechrecognition,thatis,thelessthevalueofd′.

简介：为这个房间里的推动地的健全紧张测量的一个新系统是proposed.This测量系统由一个可重复的鼓舞声音组成在一个慢慢地旋转的平台上修理的来源和一个麦克风，它等价于由许多完美地匹配的microphones.The测试原则组成的一个圆麦克风数组被介绍，典型申请是在为这个房间里的推动地的健全紧张测量是的这个系统之上的described.Basedrealized.Therefore，不是仅仅时间而且

简介：Animpulseresponsetechniquehasbeeninvestigatedbyapplicationtotheopenscreensforobtainingsoundtransmissionloss.ThemeasurementsofsuchscreensaccordingtoISO140werealsopresented.ThepredictedresultscalculatedbyamodelwhichisbasedonHuygen’sprincipleandKirchhoff’sformulationhaveshowngoodagreementswiththeresultsobtainedbyimpulsemethod.Themethodrequiresnospecialistacousticfacilitiesandmeasurementsystemscanbeportable.

简介：一台成双的单向性的推动汽轮机被建议了以便提高波浪精力植物的表演。这个汽轮机系统使用二台单向性的推动汽轮机，他们的流动方向与对方不同。然而，汽轮机特征没迄今为止被澄清。在稳定的流动条件下面的一台单向性的推动汽轮机的表演被在这研究与大活塞/柱体使用一条风隧道试验性地调查。然后，成双的推动汽轮机的效率被伪稳定的分析用试验性的结果估计了。

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简介：Thespatialimpulseresponse(SIR)methodisoftenusedasthe’goldstandard5insimulationoftransientacousticwavefieldsduetoitshighaccuracyinthelineardomain.However,ahighsamplingfrequencyisoftenrequiredinordertoachievethehighaccuracy.Asaresult,alargeamountofdatahastobeprocessed.Inthispaperafastapproachforcomputingspatialimpulseresponseisproposedtoreducethecomputationburden.TheproposedapproachisdevelopedbyemployingtherelationshipofSIRsatobservedpointsandSIRsoftheprojectionpointsonthetransducersurface.Twocriticalparametersusedintheproposedapproach,thecalculationsamplingfrequencyandtheinterpolationsamplingfrequency,arethenanalyzed.Resultsshowthatfora2.25MHzrectangulartransducerwiththesizeof5mmxlOmm,acalculationsamplingfrequencyof1000MHzandaninterpolationsamplingfrequencyof500MHzcanachievesuperiorperformancewhileimprovingthecomputationefficiency18timesthanthedirectsolving.

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简介：ThispaperpresentsthecomparisonofathreedimensionalComputationalFluidDynamics(CFD)analysiswithempiricalperformancedataofa0.6mimpulseturbinewithfixedguidevanesusedforwaveenergypowerconversion.Pro-Engineer,GambitandFluent6wereusedtocreatea3-Dmodeloftheturbine.Ahybridmeshingschemewasusedwithhexahedralcellsinthenearbladeregionandtetrahedralandpyramidcellsintherestofthedomain.Theturbinehasahub-to-tipratioof0.6andresultswereobtainedoverawiderangeofflowcoefficients.Themodelyieldedamaximumefficiencyofapproximately54%ascomparedtoamaximumefficiencyofaround49%fromexperiment.Adegreeofinsightintoflowbehaviour,notpossiblewithexperiment,wasobtained.

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简介：在这研究，为波浪精力变换与固定指南翼推进一台推动汽轮机的表演的改进以便完成，表演上的指南翼形状的效果被实验调查。调查被模型在稳定的流动状况下面测试执行。作为结果，因为转矩的增加，有3D指南翼的汽轮机的效率比有2D指南翼的汽轮机的稍微优异，这被发现指南翼，尽管越过为3D案例的汽轮机的压力落下为2D案例比那稍微高。关键词液体机械-推动汽轮机-指南翼-波浪精力变换CLC数字TK735