基于声学信号的EPS板薄抹灰外墙外保温系统缺陷检测试验研究  

Experimental Study on Defect Detection of the External Wall Thermal Insulation System of Expanded Polystyrene Board with Thin Plastering Based on Acoustic Signal

作　　者：王卓琳 张东波 陈溪 蒋利学 郑士举 WANG Zhuolin;ZHANG Dongbo;CHEN Xi;JIANG Lixue;ZHENG Shiju(Shanghai Key Laboratory of Engineering Structure Safety,Shanghai Research Institute of Building Sciences Co.,Ltd.,Shanghai 200032,China)

机构地区：[1]上海市建筑科学研究院有限公司上海市工程结构安全重点实验室,上海200032

出　　处：《施工技术》2020年第21期20-23,共4页Construction Technology

基　　金：国家重点研发计划(2017YFC0702900);上海市建设工程检测行业课题(2018-05)。

摘　　要：针对EPS板薄抹灰外墙外保温系统空鼓、开裂、脱落等缺陷,提出基于声学信号的无损检测技术。对外保温系统不同位置处敲击产生的声学信号进行时频分析,并提取时域信号幅值和时频信号首个峰值频率,以判断外保温系统是否存在缺陷。试验结果表明,基于声学信号的无损检测技术可用于EPS板薄抹灰外墙外保温系统缺陷检测。A nondestructive testing technology based on acoustic signals is proposed for the detection of defects such as hollow,cracking and following off existing in the external wall thermal insulation system of expanded polystyrene board with thin plastering. The time-frequency properties of acoustic signals generated by knocking different regions in the external thermal insulation system are investigated in the experiments. The amplitude of acoustic signals in the time domain and the first peak frequency of timefrequency signals are extracted to determine whether there is defect existing in the external thermal insulation system. The experimental results show that the nondestructive testing technology based on acoustic signals can be used to defect detection of the external wall thermal insulation system of expanded polystyrene board.

关 键 词：外墙 外保温系统 EPS板 声学信号 时频分析 峰值频率 缺陷 检测 

分 类 号：TU55[建筑科学—建筑技术科学] TB132[理学—物理]