摘要
描述了基于小波包分解的应力波无损检测分析方法。通过对应力波信号进行熵标准下的最优小波包分解和对一定节点分解系数对应信号成分加以重构 ,提取实测信号所包含的对应于缺陷部位的应力波反射特征信息 ,再现了反射波信号在时间轴上的规律性 ,消除了由实测信号直接读取存在的潜在错误。数值模拟试验显示了方法的合理性 ,在此基础上 ,进行了对桩基和锚杆工程质量检测的实际应用研究。本文研究工作对于分析那些无法直接判读反射波信息的测试信号 ,显示出独特的吸引力 ,提高了应力波无损检测方法的可靠性。
An analytic method of stress wave testing using wavelet packet decomposition is presented in this paper. By computing the optimal wavelet packet decomposition of the stress wave signal with a criterion of the entropy and reconstructing the signal at some nodes, the reflecting characteristics of the stress wave hiding in the original signal is obtained and the potential error caused by reading from the original signal directly is reduced significantly. Numerical simulation and experimental results show good agreement. The method gives a more accurate result in dealing with those complex signals from witch it is difficult to get the reflecting characteristics directly.
出处
《振动工程学报》
EI
CSCD
北大核心
2002年第4期488-491,共4页
Journal of Vibration Engineering
