偏心受压作用下工字梁超声测试稳定性研究

Ultrasonic Testing Stability on an I-Beam under Eccentric Compression

目的研究偏心受压作用下工字梁超声测试数据和荷载识别结果的稳定性。方法由不同荷载等级的波形矩阵构造了一个荷载特性向量,通过该特性向量与波形向量的方向余弦提取归一化荷载指标;同时,分析记录波形,特性波形以及残差波形的统计特性。结果比较特性波形以及残差波形误差的不确定度,发现特性波形的噪声含量大致为残差波形的1/10。结论对测试方法在偏心受压工字梁模型上的有效性进行了验证,表明高维空间的特性方向对噪声具有抗干扰能力。

The stability of ultrasonic test data and load identification results of I-beam under eccentric compression is investigated in this paper.A load characteristic vector is constructed from the waveform matrices of different load levels,and the load indicator is extracted by the direction cosine between the characteristic vector and the waveform vector.At the same time,the statistical characteristics of Pre-processed,Characteristic and Residual waveform were analyzed.Comparing the noise energy of characteristic waveform and residual waveform,it is found that the noise content of Characteristic waveform is significantly lower than that of Residual waveform.The validity of the test method was verified on an eccentric compressed I-beam model,showing that the characteristic direction in high-dimensional space is resistant to noise.