《ON CONDITION MONITORING OF EXHAUST VALVES IN MARINE DIESEL ENGINE》.pdf

ON CONDITION MONITORING OF EXHAUST VALVES IN MARINE DIESEL ENGINES x z z x x x T L Fog L K Hansen J Larsen H S Hansen L B Madsen P Srensen E R Hansen x and P S Pedersen x x Research Development MAN BW Diesel AS Teglholmsgade DK Cop enhagen SV Denmark Email tof hsh lbm p cs er pspmanbwdk Website wwwmanbwdk z THOR Center for Neuroinformatics Department of Mathematical Mo deling Bldg Technical University of Denmark DK Lyngby Denmark Email lkhansen jlimmdtudk Website eivindimmdtudkthor Abstract Exp erimental investigations of the p ossibilities to nonintrusively characterize exhaust valve conditions in large marine diesel engines were carried out on a four cylinder mm b ore stroke marine diesel engine at MAN BW Diesels Research Center in Cop enhagen Denmark The exp eri ments comprised three dierent valve conditions where two were concerned with articially induced valve burnthrough situations The primary p otential monitoring measurements were vibration and structureb orne stress waves also known as Acoustic Emission AE Results have shown that the AE signals has a ma jor advantage over other involved sensors indicating sensitivity to b oth mechanical and uidmechanical combustion related activity Recorded data has b een prepro