基于多尺度排列熵的波纹管压浆超声检测

Quality testing of corrugated pipe based on multi-scale permutation entropy

将多尺度排列熵引入波纹管压浆质量检测中,对不同注浆密实程度的波纹管进行超声检测,对回波信号进行分析。为了检测信号在不同尺度下的动力学特征,提出了一种基于多尺度排列熵偏均值的波纹管压浆质量检测方法,利用有限元进行仿真,仿真结果表明,波纹管压浆质量越差,回波信号对应的排列熵偏均值越小。实际模型的处理结果表明该指标能够有效地判断波纹管压浆质量。

The multi-scale entropy is introduced into the defects diagnosis of corrugated pipe of concrete structure. The corrugated pipes of different grouting dense degrees are tested and the echo signals are analyzed. In order to extract the dynamic characteristics at different scales of vibration signals, the partial mean of mulfiscale permutation entropy is proposed to measure the quality of the corrugated pipe, and the simulation results show that the poorer the corrugated grouting quality is, the smaller the echo signal＇s partial mean is. The results of echo signal detection of the corrugated pipe has verified the effectiveness of this index.