A method for identifying false positive frequencies extracted from resonant ultrasound spectra for highly dissipative materials
A method for identifying false positive frequencies extracted from resonant ultrasound spectra for highly dissipative materials
复制标题
一种识别从高耗散材料的共振超声谱中提取的假阳性频率的方法
DOI：
10.1063/5.0005922
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发表时间：
2020-10
影响因子：
3.2
通讯作者：
Niu Haijun
中科院分区：
文献类型：
--
作者：
Zhang Qiang;Shen Fei;Fan Fan;Wang Rui;Wang Yue;Niu Haijun
共振超声光谱（罗斯）是一种无损检测技术，其应用之一是通过测量固体的自由振动共振频率来确定其弹性常数。对于耗散材料，振动谱峰宽且强烈重叠，并且在某些情况下，由线性预测滤波器提取的共振频率被认为是不能与理论共振频率配对的假阳性频率。当这些假正频率与理论共振频率错误配对时，弹性常数的逆识别也受到严重影响。本文提出了一种新的选择指标和罗斯谐振频率的提取方法，以消除误报频率。利用理论频率与提取频率之间相对误差的变化来更新传统的频率选择指标。提出了一种结合试错法和贝叶斯方法的提取过程。采用一种仿骨材料（品质因子Q = 30）和模拟的共振谱来验证所提出的方法。新的选择指数有效地提高了识别假阳性频率的性能。此外，所提出的过程可以应用于提高配对和估计精度的罗斯。不同试样的弹性常数的计算具有良好的一致性。本文提出的新方法可以更好地分析高耗散材料的弹性常数，有助于扩大罗斯法的应用范围。
Resonant ultrasound spectroscopy (RUS) is a nondestructive technique, and one of its applications is to determine the elastic constants of a solid by measuring its free-vibration resonant frequencies. For dissipative materials, the vibration spectrum peaks are broad and strongly overlapped, and in some cases, the resonant frequencies extracted by a linear prediction filter are considered to be false positive frequencies that cannot be paired with theoretical resonant frequencies. The inverse identification of elastic constants is also seriously influenced when these false positive frequencies are wrongly paired with theoretical resonant frequencies. In this paper, a new selection index and an extraction process for RUS resonant frequencies are studied to discard false positive frequencies. The change in the relative error between the theoretical and extracted frequencies was employed to update the traditional frequency selection index. An extraction process was proposed by combining a trial-and-error method and a Bayesian method. A bone-mimicking material (quality factor, Q ≈ 30) and the simulated resonant spectra were adopted to validate the proposed method. The performance of identifying false positive frequencies was effectively improved by using the new selection index. Moreover, the proposed process can be applied to enhance the pairing and estimation accuracy for RUS. Calculations of the elastic constants for distinct specimens presented good consistency. The new method proposed in this paper provides a better analysis of the elastic constants in highly dissipative materials and can help to extend the application range of RUS.
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影响因子：
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作者：
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通讯作者：
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影响因子：
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影响因子：
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作者：
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通讯作者：
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