温变工况下超定独立成分分析导波监测方法

肖航,肖黎,屈文忠

振动与冲击 ›› 2020, Vol. 39 ›› Issue (15) : 133-141.

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (15) : 133-141.
论文

温变工况下超定独立成分分析导波监测方法

  • 肖航,肖黎,屈文忠
作者信息 +

Guided wave monitoring method based on over-determined independent component analysisunder temperature variation conditions

  • XIAO Hang, XIAO Li,QU Wenzhong
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文章历史 +

摘要

基于超声导波的结构健康监测技术在实际工程应用中受到变化的环境工况条件的影响,由于独立成分分析方法对于处理时变工况条件下的大量监测导波信号存在局限性,以及对不同程度的损伤表征研究存在不足,提出一种基于超定独立成分分析的导波监测方法并改进了基于k均值聚类的损伤指标。以广泛存在的环境温度作为环境变量,通过主成分分析从大量导波信号组成的观测矩阵中确定独立分量个数,使用独立成分分析将处理后的导波信号分解为独立分量,能够有效地将损伤与环境工况的影响分离到不同的独立分量中。对长期经受环境温度变化的铝板进行了导波监测实验,结果表明该方法能够有效减少独立分量数目并从大量导波信号中排除环境温度的干扰识别出损伤,并且对处于温变条件下的完整和不同损伤程度的铝板进行了损伤识别实验,进一步研究了该方法在排除环境温度干扰的同时表征损伤程度的效果。

Abstract

Ultrasonic guided wave based structural health monitoring technology will be affected by changing environment and operating conditions in practical engineering applications. Because of the limitations of independent component analysis methods for processing a large number of monitoring guided waves, and the lack of research on different degrees of damage characterization, a guided wave monitoring method based on over-determined independent component analysis is proposed and the damage index based on k-means clustering is improved. The temperature, which has a large influence on the monitoring signal and is widely exist, is taken as an environmental variable. The principal component analysis (PCA) is used to analyze the observation matrix composed of a large number of guided wave signals to determine the number of independent components, and independent component analysis (ICA) is used to decompose the processed guided wave signals into independent components. The influence of damage and that of environmental and operational conditions are separated into different independent components. The guided wave monitoring experiment was carried out on aluminum plates subjected to long-term changes in ambient temperature. The results show that the method can effectively reduce the number of independent components and eliminate the interference from the ambient temperature in a large number of guided signals to identify the damage. Furthermore, the damage identification experiment was carried out on the aluminum plate with intact and different damage degree under the temperature change condition. The effect of the method on charactering the damage degree while eliminating the environmental temperature interference was studied.

关键词

导波 / 损伤识别 / 压电主动传感 / 超定独立成分分析 / 温度变化

Key words

guided wave / damage detection / piezoelectric active sensing / over-determined independent component analysis / temperature variation

引用本文

导出引用
肖航,肖黎,屈文忠. 温变工况下超定独立成分分析导波监测方法[J]. 振动与冲击, 2020, 39(15): 133-141
XIAO Hang, XIAO Li,QU Wenzhong. Guided wave monitoring method based on over-determined independent component analysisunder temperature variation conditions[J]. Journal of Vibration and Shock, 2020, 39(15): 133-141

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