使用球链冲击激励对混凝土分层进行声学评估。

Acoustic evaluation of concrete delaminations using ball-chain impact excitation.

作者信息

Sun Hongbin, Zhu Jinying, Ham Suyun

机构信息

Department of Civil Engineering, University of Nebraska-Lincoln, Omaha, Nebraska 68182, USA

Department of Civil Engineering, The University of Texas at Arlington, Arlington, Texas 76019, USA

出版信息

J Acoust Soc Am. 2017 May;141(5):EL477. doi: 10.1121/1.4983343.

DOI:10.1121/1.4983343

PMID:28599516

Abstract

This letter presents an automated acoustic sensing device for rapid detection of delamination in concrete. The device consists of ball-chains for continual impact excitation and multi-channel microphones for acoustic sensing. A ball-chain is formed by multiple metal balls connected by flexible ropes and is dragged on concrete surface to excite vibration of delaminations. Compared to the conventional chain drag test, the ball-chain generates acoustic signals with higher signal-to-noise ratio (S/N) because the balls give isolated but continual impacts on concrete surface during dragging. The proposed method was validated on a concrete specimen with artificial delaminations.

摘要

本文介绍了一种用于快速检测混凝土分层的自动声学传感装置。该装置由用于连续冲击激励的球链和用于声学传感的多通道麦克风组成。球链由通过柔性绳索连接的多个金属球形成，并在混凝土表面拖动以激发分层的振动。与传统的链拖试验相比，球链产生的声学信号具有更高的信噪比（S/N），因为在拖动过程中球对混凝土表面产生孤立但连续的冲击。所提出的方法在具有人工分层的混凝土试件上得到了验证。