有机热载体炉积碳层导波检测模态识别研究  

Ultrasonic guided wave modal identification for depositional carbon layer detection of an organic heat transfer heater

作　　者：彭小兰[1,2] 吴超[1] 

机构地区：[1]中南大学资源安全工程学院,长沙410083 [2]湖南省特种设备检验检测研究院,长沙410111

出　　处：《振动与冲击》2014年第3期105-109,共5页Journal of Vibration and Shock

基　　金：质检公益性行业科研专项(201210080)

摘　　要：针对有机热载体炉火灾的关键因素积碳层，提出利用超声导波对其厚度进行定量检测的方法。阐述了超声导波检测原理和检测系统。然而，由于管道超声导波具有多模态和频散特性，利用时频分析对炉管积碳检测的超声导波模态进行识别。接收信号的时频分析结果与L（0，2）模态的理论频散曲线较为拟合。并且通过时差法确定接收信号的实验群速度与理论群速度相对误差仅为1．88％#3．48％。从而确定接收信号主要为L（0，2）模态。该研究结果为基于超声导波的有机热载体炉积碳检测技术奠定了基础。Carbon deposition of an organic heat transfer heater is a key factor for fire risk assessment.Here, ultrasonic guided wave was used to detect depositional carbon layer thickness of an organic heat transfer heater.Also,the detection principle and its test system were described.However,due to multi-mode and dispersive nature of ultrasonic guided wave in pipes,time-frequency analysis was used to identify modes of ultrasonic guided wave for depositional carbon layer inspection.It was shown that the time-frequency feature of the received signal is close to that of the theoretical dispersion curve of L（0,2）mode;furthermore,the relative error between the test group velocity of the received signal and the theoretical group velocity obtained with the time difference method is only 1.88%#3.48%;therefore,the received signals mainly are L（0,2）mode.The study results provided a significant theoretical foundation for depositional carbon layer detection technology of an organic heat transfer heater.

关 键 词：超声导波 时频分析 有机热载体炉 积碳层 模态 

分 类 号：X933[环境科学与工程—安全科学] TB559[理学—物理]