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강부병(Kang B-B),Marco Morbidini,Peter Cawley 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
Studies about Thermosonics are conducted with an acoustic horn with high power capability to investigate the characteristics of the vibration produced in turbine blades with complex geometry and to develop a excitation method for achieving reliable excitation in the non-linear vibration range for thermosonic testing. The influence of the clamping method and the excitation signal that is input to the horn on the vibration characteristics generated in the testpiece is presented. As a result, a fast narrow band sweep test with a general purpose amplifier and stud coupling is proposed as an excitation method for thermosonic testing. This method can be applied to different types of turbine blades and also to other components. One typical characteristic of a thermosonic test using non-linear vibration is the lack of repeatability in the amplitude and the frequency characteristic of the vibration. Therefore, vibration monitoring is necessary for reliable thermosonic testing and a Heating Index(HI) has been proposed as a criterion indicating whether sufficient vibration is achieved in a tested structure or not.
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