Location of a defect in a concrete block by a non-destructive technique

Acoustical Science and Technology

Toyota Fujioka¹  Masato Abe¹  Yoshifumi Nagata¹ 

[1] CIS., Iwate University

关键词: Non-destructive measurement;    Vibration;    Multiple sensors;    Beamforming;   

DOI  :  10.1250/ast.23.308

学科分类：声学和超声波

来源: Acoustical Society of Japan

【 摘 要 】

References(4)Cited-By(12)This paper describes a method to estimate the position of a crack in a concrete block using several vibration pick-ups. An array of vibration pick-ups is attached on the concrete block, and a vibration pulse is forced by using a small hammer. If there is a crack, a reflection wave is generated from the position of the crack. Therefore, conventional methods to estimate the position of vibration source seems to be useful for this purpose. However, since the concrete block is elastic, there are three wave propagation modes; the surface wave mode, the primary wave mode and the secondary wave mode. Since the necessary primary wave mode is not significant in magnitude, we cannot estimate the position by the conventional methods. To increase the S/N, we had already proposed a method to eliminate the first-coming surface wave. However, the method was insufficient to achieve a higher S/N. Therefore, this paper proposes a new method to achieve a better location of a crack. Some experiments were carried out, and good results were obtained.

【 授权许可】

Unknown