摘要
基于压电陶瓷的主动传感技术对不同服役年限的木构件进行损伤评估。取服役年限为0年、3年、40年的木构件制成三个尺寸相同的立方体试件,在每个试件的六个面上分别粘贴压电陶瓷片(PZT),用于信号的发射及接收。分别对不同服役年限试件传感器测量的信号进行了小波包和功率谱分析,发现应力波沿木材纵向传播时相较于服役年限短的试件,长年限试件的信号的幅值更大,沿木材径向及弦向传播时随木材服役年限的增加信号的幅值随之减小。结果表明,文中提出的方法能有效的识别不同服役年限的木构件,可为实际工程中不同服役年限木结构古建筑健康监测提供参考。
Damage estimation was carried out against the timber components with different service lives in virtue of the active sensing technology of piezoelectric transducer.In the experiment,three cube specimens of the same size with the service life of timber components of 0 year,3 years and 40 years respectively were used,and lead zirconate titanate(PZT)patches were also applied on six surfaces of every specimen,for the purpose of signal transmission and receiving.It was found through the wavelet packet and power spectrum analysis against the signal measured by the specimen sensors with different service lives that,compared with specimens with a shorter service life,the amplitude of specimens with a long service life is bigger when the stress wave transmits vertically along the timber and the amplitude of signal becomes smaller with the increase of the timber’s service life when the stress wave transmits in a radial and chordwise manner along the timber.The results show that the method proposed in this paper can identify timber components with different service lives effectively,so as to provide reference for monitoring the health of ancient architectures with timber components with different service lives in the actual projects.
作者
蒙卉恩
杨霞
李顺涛
杨文伟
MENG Huien;YANG Xia;LI Shuntao;YANG Wenwei(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan Ningxia 750021,China;Ningxia Center of Research on Earthquake Protection and Disaster Mitigation in Civil Engineering,Yinchuan Ningxia 750021,China;College of Civil Engineering,Hunan University,Changsha Hu’nan 410082,China)
出处
《传感技术学报》
CAS
CSCD
北大核心
2021年第1期129-136,共8页
Chinese Journal of Sensors and Actuators
基金
国家自然基金项目(51968044)
宁夏自然科学基金项目(2020AAC02007)。
关键词
健康监测
压电陶瓷
小波包分析
木构件
应力波
health monitoring
lead zirconate titanate(PZT)
wavelet packet analysis
timber components
stress wave
