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Updated: Feb 20, 2026

Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population
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Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population

Published on: January 31, 2025

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使用基于CFIE的Nyström方法加速由内核独立算法加速的3D超声波NDE的高效虚拟固有频率无问题全波模拟

Yang Bao1, Yiming Liu2, Jiahui Yu2

  • 1College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing, Jiangsu 210023, China; Fujian Key Laboratory of Special Intelligent Equipment Safety Measurement and Control, Fujian Special Equipment Inspection and Research Institute, Fuzhou, Fujian 350008, China.

Ultrasonics
|February 18, 2026
PubMed
概括

本研究引入了一种超声波非破坏性评估 (UNDE) 的新方法,可以克服虚构的自身频率问题. 结合高阶尼斯特罗姆方法 (NM) 和自适应交叉近似 (ACA) 的综合场积分方程 (CFIE) 公式显著提高了3D UNDE问题的计算效率和准确性.

关键词:
联合场积分方程 (CFIE)快速激发扫描 (FES) 算法虚构的使用异常频率问题.独立于内核 (KI) 的算法在Kriging中进行插值.尼斯特罗姆方法 (NM)超声波非破坏性评估 (UNDE) 超声波非破坏性评估

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相关概念视频

Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear....
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Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Aliasing01:18

Aliasing

Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
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