摘要
针对现有混凝土/木制电线杆的损伤检测中存在的问题,本研究提出了一种基于窄带频率激励与先进的信号处理技术相结合的新型无损检测系统。与传统宽带频率波锤击试验相比,本检测系统采用触觉变送器产生可控窄带频率应力波,避免了传统系统中的多态波激励。为了提高损伤检测的精度,本系统采用频率响应函数方法以及主成分分析从单频应力波中提取信号特征,从而对电线杆健康状态进行评估。为了验证本检测系统和信号处理方法的有效性,本文对具有不同损伤状况的4种木制电线杆和5种混凝土电线杆进行了无损检测。实验结果显示,本文提出的研究方法的状况评估准确性分别达到了93%和97%。
Aiming at solving the issues existing in non-destructive testing（NDT） of current timber or concrete poles,this research puts forward a new NDT system based on narrow band frequency excitation and advanced signal processing. Compared with tradition broad band signals caused by traditional hammer hit, this system employs tactile transducers to generate controllable stress wave signals,avoiding multi-mode signal in traditional system. In order to improve the testing accuracy, this new system adopts frequency response function method and principal component analysis to deal with stress wave signals and extract signal features,therefore realizing condition assessment of pole health. To validate the performance of the proposed technique,4 timber poles and 5 concrete poles with different health states are used for testing. The experimental results show that the evaluation of poles using this method can arrive at 93% and 97%, respectively.
出处
《自动化与仪器仪表》
2017年第1期105-106,109,共3页
Automation & Instrumentation
关键词
无损检测
窄带频率激励
频率响应函数
主成分分析
non-destructive testing
narrow-band excitation
frequency response function
principal component analysis
