大型溶接構造物における溶接部の安全監視に関する研究 : テレメーター AE の開発と実用化

概要

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We have developed the world-first 10 channel acoustic emission telemetry system where acoustic emission singals (envelope profile) from incipient crackings are transmitted to signal processing unit by way of FM radio. The system was designed to apply acoustic emission techniqure to the continuous safety surveillance of very large welded structures like oil storage tnaks, line pipes, and chemical reactors where enormous lengths of wiring are required otherwise. The system was applied to a 17m diameter spherical tank and a (10)^4kl cone-roof tank where a pulse simulating acoustic emission was generated at certain point on the surfaces and recieved at the various locations of different distances up to 10m from the signal source. Both arrival-time triangulation and attenuation calibration method were used to locate acoustic emission events. Sound velocity and attenuation characteristics were obtained by using the leading edge of the FM-radioed acoustic emission envelope and its amplitude respectively. The measured values correspond well with the ones reported in the literatures. Further the system was successfully applied to monitor and locate cracks of hydrogen weld cracking as well as fatigure crack propagation of a 3m diameter spherical pressure vessel.
社団法人溶接学会の論文
1980-04-05