一种革新的不测速声发射源线性定位方法
Journal: Building Technology Research DOI: 10.12238/btr.v6i3.4137
Abstract
为降低波速时空测量误差对定位结果的影响,本文提出了一种革新的不测速声发射源线性定位方法。首先,根据到时数据和传感器坐标信息,建立无需波速的声发射源控制方程,并引入中间变量线性化控制方程；其次,推导与中间变量相关的正交投影算子,分离声源坐标和中间变量,构建中间变量的一元三次方程。最后,求解中间变量,并根据残差平方和最终确定声发射源坐标。开展模拟仿真试验,验证该方法在不同到时误差、波速误差以及声源位置下的定位有效性；试验结果表明,该方法的定位精度和稳定性均优于传统方法；例如在到时误差为0.2μs时,新方法的平均定位误差仅有1.5mm,远低于传统定位方法的2.2mm和7.0mm；此外,模拟仿真实验也表明声源位置对定位精度和波速反演精度均有不同程度的影响,但无论声源位于何处,新方法均具有较传统方法更高的定位精度和波速反演精度。
Keywords
声发射；源定位；无波速；线性方程
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[12] Li Q, Dong L, Li X, et al. Effects of sonic speed on location accuracy of acoustic emission source in rocks[J].Transactions of Nonferrous Metals Society of China (English Edition),2011,21(12):2719-2726.
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[15] Rui Y, Zhou Z, Cai X, et al. A novel robust method for acoustic emission source location using dbscan principle[J].Measurement,2022,191:110812.
[16] Das A K, Lai T T, Chan C W, et al. A new non-linear framework for localization of acoustic sources[J]. Structural Health Monitoring,2019,18(2):590-601.
[17] Dong L, Shu W, Han G, et al. A multi-step source locali zation method with narrowing velocity interval of cyber-phys ical systems in buildings[J].IEEE Access,2017,5(c):20207-20219.
[18] Chan Y T, Ho K C. A simple and efficient estimator for hyperbolic location[J]. IEEE Transactions on Signal Process ing,1994,42(8):1905–1915.
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[21] Leighton F, Blake W. Rock noise source location techniques[M]//U S Bur Mines, Rep Invest 7432. US Department of the Interior Information, Bureau of Mines,1970.
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[24] Zhou Z, Rui Y, Cai X, et al. A closed-form method of acoustic emission source location for velocity-free system using complete tdoa measurements[J].Sensors (Switzerland), 2020,20(12):3553.
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