Dot impact printer head based hammering test inspection system and basic investigation of mechanical defect detection method

Abstract

In this paper, a hammering test system using the impact head of a dot impact printer is introduced. The proccess involves hammering the object with the impact head and acquiring the sound generated using a microphone. The obtained signal is analyzed and an estimation of the state of the surface or the presence of internal defects are performed. As a first step, fundamental investigations were carried out using test specimens that had fatigue cracks which are representative defects. The result of the experiment shows that there is a difference between the test pieces with cracks and without cracks.