Analysis on characteristics of dynamic signal for bolt anchorage system
Analysis on characteristics of dynamic signal for bolt anchorage system
复制标题
DOI：
--
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Zhang Yong-xing
中科院分区：
文献类型：
--
作者：
Zhang Yong-xing
通过对螺栓锚固系统模型进行动态试验，对螺栓锚固系统的动态信号进行时频分析，通过现代信号处理方法获得准确的信号特征。通过计算Wigner-Ville分布可以得到时域和频域信号。不同损伤的螺栓之间反射能量不同。可以分析信号变化的大致位置和程度，并与完整螺栓进行比较。小波分析提供了更多关于螺栓锚固质量的诊断信息，更适合于损伤螺栓锚固系统动态测试信号的识别。
Based on the dynamic tests on models of a bolt anchorage system,the time-frequency analysis of dynamic signals for the bolt anchorage system was made,and the accurate signal characteristics were acquired through modern signal processing methods.It was shown that short-term Fourier transform of the signals could indicate the signal intensity in the phase plane and the reflected signal from the bolt bottom was clear but the reflected signal from the bolt impairment could not be identified.With increasing of the quantity of bolt impairment or level of bolts,the energy of the reflected signals increased.The distribution of energy of the signals could be obtained in time and frequency domains by calculating Wigner-Ville distribution.The reflected energy was different among the bolts with various impairments.The approximate position and degree of signal variation could be analyzed and compared with those of the integrity bolts.Wavelet analysis provided more diagnostic information about bolt anchorage quality and was more suitable for the identification of dynamic test signal for bolt anchorage system with impairments.