水电站钢岔管水压试验声发射衰减特性研究
发布时间：2018-08-12 08:01
【摘要】：为研究水电站压力钢岔管声发射衰减特性及修正声发射定位源幅度,综合考虑声发射信号的三个主要衰减因素,提出了一个适合不同波型的声发射信号声压与传输距离间的表达式;建立了不考虑扩散衰减的线性拟合模型以及考虑扩散衰减的自定义非线性拟合模型;给出了声发射定位源的幅度修正方法,并以新疆某钢岔管水压试验验证了模型的准确性。结果表明,考虑扩散衰减的自定义非线性拟合模型幅度—距离衰减曲线拟合最为理想;幅度修正曲线简便准确。研究结果为类似结构钢岔管声发射衰减特性测试提供了参考。
[Abstract]:In order to study the attenuation characteristics of acoustic emission of pressure steel bifurcation pipe in hydropower station and the amplitude of modified acoustic emission location source, three main attenuation factors of acoustic emission signal are considered synthetically. An expression between acoustic pressure and propagation distance of acoustic emission signals with different wave patterns is proposed, and a linear fitting model without considering diffusion attenuation and a self-defined nonlinear fitting model with diffusion attenuation are established. The amplitude correction method of acoustic emission location source is presented, and the accuracy of the model is verified by water pressure test of a steel branch pipe in Xinjiang. The results show that the amplitude-distance attenuation curve fitting of the self-defined nonlinear fitting model considering diffusion attenuation is the most ideal, and the amplitude correction curve is simple and accurate. The results provide a reference for the measurement of acoustic emission attenuation characteristics of steel bifurcated pipes of similar structures.
【作者单位】： 水利部水工金属结构质量检验测试中心;
【基金】：中央级科学事业单位修缮购置专项资金项目(1261421610477) 水利部水利技术标准规程规范编制项目(1261421680495)
【分类号】：TV732.4
，
本文编号：2178438
[Abstract]:In order to study the attenuation characteristics of acoustic emission of pressure steel bifurcation pipe in hydropower station and the amplitude of modified acoustic emission location source, three main attenuation factors of acoustic emission signal are considered synthetically. An expression between acoustic pressure and propagation distance of acoustic emission signals with different wave patterns is proposed, and a linear fitting model without considering diffusion attenuation and a self-defined nonlinear fitting model with diffusion attenuation are established. The amplitude correction method of acoustic emission location source is presented, and the accuracy of the model is verified by water pressure test of a steel branch pipe in Xinjiang. The results show that the amplitude-distance attenuation curve fitting of the self-defined nonlinear fitting model considering diffusion attenuation is the most ideal, and the amplitude correction curve is simple and accurate. The results provide a reference for the measurement of acoustic emission attenuation characteristics of steel bifurcated pipes of similar structures.
【作者单位】： 水利部水工金属结构质量检验测试中心;
【基金】：中央级科学事业单位修缮购置专项资金项目(1261421610477) 水利部水利技术标准规程规范编制项目(1261421680495)
【分类号】：TV732.4
，
本文编号：2178438
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