Crack detection using Non- Linear Wave Modulation Spectroscopy
Independent thesis Advanced level (degree of Master (Two Years))Student thesis
This report comprises an investigation of the non-linear ultrasonic crack detection method; Non-Linear Wave Modulation Spectroscopy, NWMS. Cracks in test objects were according to the NWMS method detected through their non-linearity. The non-linearity was observed as sum and difference frequencies for an ultrasonic signal interacting with a low frequency signal in the test objects. A test setup and test procedure was developed and an Excel program for a rational suggested quantification of non-linearity was written. The method was applied and evaluated on cracked and non-cracked rotor blades for jet engines.
Place, publisher, year, edition, pages
2003. , 130 p.
NWMS, Rotor blade, Micro crack, Excel, Theoretical derivation, Experimental implification
IdentifiersURN: urn:nbn:se:bth-3017Local ID: oai:bth.se:arkivex35D3142B3F8EB428C12577380028B036OAI: oai:DiVA.org:bth-3017DiVA: diva2:830312