第45卷(2023)第2期Vol.45(2023)No.2柴油机DieselEngineDOI:10.12374/j.issn.1001-4357.2023.02.006基于声发射技术的缸套-活塞环润滑状态监测韩昊1,丁红元2,石昭宇1,王忠巍1,王伯群1(1.哈尔滨工程大学动力与能源工程学院,哈尔滨150001;2.武汉第二船舶设计研究所,武汉430205)摘要:为实现对缸套-活塞环摩擦润滑状态的监测,基于声发射技术对某小型四缸柴油机缸套−活塞环的润滑状态进行研究。采用小波阈值降噪法抑制阀门启闭和燃烧所引起的声发射信号,分别提取每个冲程声发射信号均方根(rootmeansquare,RMS),选择RMS值作为评价缸内润滑状态的指标。研究结果表明:进排气冲程RMS值可以很好地表征缸内的润滑状态;受试验条件的限制,贫油状态的RMS值整体上略低于正常状态的RMS值,但差异性并不明显。关键词:柴油机;声发射;缸套−活塞环;润滑状态;小波降噪中图分类号:TK421+.9文献标志码:A文章编号:1001-4357(2023)02-0026-06LubricationStateMonitoringofCylinderLiner-PistonRingBasedonAcousticEmissionTechnologyHANHao1,DINGHongyuan2,SHIZhaoyu1,WANGZhongwei1,WANGBoqun1(1.CollegeofPowerandEnergyEngineering,HarbinEngineeringUniversity,Harbin150001,China;2.WuhanSecondShipDesignandResearchInstitute,Wuhan430205,China)Abstract:Inordertorealizethemonitoringofthecylinderliner-pistonringfrictionlubricationstatus,thelubricationstatusofthecylinderliner-pistonringofasmallfour-cylinderdieselenginewasstudiedbasedontheacousticemissiontechnology.Thewaveletthresholdnoisereductionmethodwasusedtosuppresstheacousticemissionsignalscausedbyvalveopeningandclosingandcombustion.Therootmeansquare(RMS)ofacousticemissionsignalsofeachstrokewasextracted,andtheRMSvaluewereselectedastheindextoevaluatethelubricationstateinthecylinder.TheresearchresultsshowthattheRMSvalueoftheintakeandexhauststrokescanwellcharacterizethelubricationstateinthecylinder,andduetothelimitationsofexperimentalconditions,theRMSvalueoftheleanoilstateisgenerallyslightlylowerthantheRMSvalueofthenormalstate,butthedifferenceisnotsignificant.Keywords:dieselengine;acousticemission;cylinderliner-pistonring;lubricationstate;waveletnoisereduction0引言柴油...