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学者姓名：刘增华
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Abstract ：
15CrMo steel has good mechanical properties and is widely used in high-temperature pressure components. After long term service, it is easy to cause material spheroidisation. The metallographic and mechanical property tests are used to evaluate the spheroidisation of specimens. Ultrasonic backscattering signal is sensitive to microstructure and contains more microstructure information, which can be used for the evaluation of spheroidisation. However, the ultrasonic backscattering signal is nonlinear, and feature extraction is difficult. In this study, ultrasonic testing is used to scan different spheroidisation specimens, and the ultrasonic backscattering signal is extracted as the input to the deep learning model, which is used to extract features from the backscattering signal. The models are evaluated using classification and regression evaluation metrics. The results show that the proposed CNN-LSTM model has good identification performance for the classification of spheroidisation and the prediction of mechanical properties. The classification accuracy, recall, precision, and F1-score are all 1. Additionally, the maximum predicted RMSE and MAE values are only 2.33 MPa and 1.70 MPa, and the minimum R2 is only 0.97. The worst prediction is the tensile strength, with an average value of 442.2 MPa and a maximum value of 481.1 MPa.
Keyword ：
Ultrasonic testing Ultrasonic testing performance deterioration performance deterioration deep learning deep learning spheroidization spheroidization quantitative evaluation quantitative evaluation
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| GB/T 7714 | Li, Jinlong , Liu, Zenghua , Zheng, Yang et al. Quantitative evaluation of spheroidisation in 15CrMo steel based on deep learning [J]. | NONDESTRUCTIVE TESTING AND EVALUATION , 2024 . |
| MLA | Li, Jinlong et al. "Quantitative evaluation of spheroidisation in 15CrMo steel based on deep learning" . | NONDESTRUCTIVE TESTING AND EVALUATION (2024) . |
| APA | Li, Jinlong , Liu, Zenghua , Zheng, Yang , Zhang, Zongjian , He, Cunfu . Quantitative evaluation of spheroidisation in 15CrMo steel based on deep learning . | NONDESTRUCTIVE TESTING AND EVALUATION , 2024 . |
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| GB/T 7714 | Liu, Zenghua . Smart Sensors for Structural Health Monitoring and Nondestructive Evaluation [J]. | SENSORS , 2024 , 24 (2) . |
| MLA | Liu, Zenghua . "Smart Sensors for Structural Health Monitoring and Nondestructive Evaluation" . | SENSORS 24 . 2 (2024) . |
| APA | Liu, Zenghua . Smart Sensors for Structural Health Monitoring and Nondestructive Evaluation . | SENSORS , 2024 , 24 (2) . |
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Abstract ：
The magneto acoustic emission (MAE) technique is an emerging non-destructive testing (NDT) method that has shown potential for defect detection in the bulk material, proven vital for the safety and integrity of the material. The MAE technique has shown promising results among modern non-destructive testing techniques for ferromagnetic materials. Although MAE technique is a long-established NDT method, it has the potential for further development. This paper provides an in-depth review of MAE signals ' physical origin and characteristics, compares them with their counterpart, Magneto Barkhausen Noise (MBN), and explores data acquisition methods and applications, including specific case studies in material defect detection. The research gaps in the MAE technique are discussed, and the paper explores potential developments, highlighting future perspectives and possible improvements.
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| GB/T 7714 | Liu, Zenghua , Riaz, Wasil , Shen, Yongna et al. Magneto acoustic emission technique: A review of methodology, applications, and future prospects in non-destructive testing [J]. | NDT & E INTERNATIONAL , 2024 , 146 . |
| MLA | Liu, Zenghua et al. "Magneto acoustic emission technique: A review of methodology, applications, and future prospects in non-destructive testing" . | NDT & E INTERNATIONAL 146 (2024) . |
| APA | Liu, Zenghua , Riaz, Wasil , Shen, Yongna , Wang, Xiaoran , He, Cunfu , Shen, Gongtian . Magneto acoustic emission technique: A review of methodology, applications, and future prospects in non-destructive testing . | NDT & E INTERNATIONAL , 2024 , 146 . |
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Abstract ：
A multi-frequency instantaneous wavenumber damage imaging method based on ultrasonic guided waves induced by laser point-by-point excitation is proposed in this paper. The experiment involved using the Nd:YAG pulsed laser is used as the excitation source to excite ultrasonic guided waves point-by-point in the detection area, and the piezoelectric ceramic transducer is used to receive ultrasonic guided wavefield at a fixed position. The wavefield information at different frequencies is extracted by a three-dimensional Fourier transform. The spatial phase distribution of the extracted guided wavefield with different frequencies is obtained by the Hilbert transform and phase unwrapping method. Then, the wavenumber of each detection point and the dispersion relations of the test piece with different thicknesses are calculated. Based on the calculated dispersion relation, the mapping relationship between the wavenumber and the thickness of the test piece is obtained. Furthermore, based on the obtained wavenumber information and wavenumber thickness mapping relationship, the thickness reduction depth of the defect can be calculated. Finally, the quantitative detection of defects is achieved through data fusion. The proposed method is verified through quantitative detection of the rectangular groove defects and the flat bottom defects with variable thickness and complex contour in the aluminium plate. At the same time, the detection results of the proposed method are compared with those of the single-frequency instantaneous wavenumber imaging method, single-frequency local wavenumber imaging method, and multi-frequency local wavenumber imaging method. In the detection results, the method proposed in this paper presents a better defect detection effect.
Keyword ：
quantitative evaluation quantitative evaluation thickness thinning defect thickness thinning defect laser ultrasonic laser ultrasonic space wavenumber imaging space wavenumber imaging Lamb waves Lamb waves
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| GB/T 7714 | Liu, Xiaoyu , Liu, Zenghua , Zhu, Yanping et al. Multi-frequency instantaneous wavenumber damage imaging method based on ultrasonic guided waves induced by laser point-by-point excitation [J]. | NONDESTRUCTIVE TESTING AND EVALUATION , 2024 . |
| MLA | Liu, Xiaoyu et al. "Multi-frequency instantaneous wavenumber damage imaging method based on ultrasonic guided waves induced by laser point-by-point excitation" . | NONDESTRUCTIVE TESTING AND EVALUATION (2024) . |
| APA | Liu, Xiaoyu , Liu, Zenghua , Zhu, Yanping , Lu, Zhaojing , Chen, Long , Wu, Bin et al. Multi-frequency instantaneous wavenumber damage imaging method based on ultrasonic guided waves induced by laser point-by-point excitation . | NONDESTRUCTIVE TESTING AND EVALUATION , 2024 . |
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Abstract ：
Ultrasonic-guided waves full wavefield scanning technology can realize non-destructive testing with non-contact. The damage detection method based on ultrasonic-guided waves' full wavefield data is widely used in thin-walled plate structures. The defect imaging method based on full wavefield data faces the challenge of simultaneously obtaining the defect contour and thickness direction information. Based on the ultrasonic-guided waves full wavefield scanning detection technology, this paper proposes a multi-time Lamb waves space wavenumber imaging method. In this method, the analytic signal of Lamb wavefield at each moment is constructed by Hilbert transform, and the phase unwrapping is carried out by amplitude sorting and multi-clustering method. Then the wavenumber information is obtained by calculating the phase gradient. The wavenumber at different times of each measurement point is arranged in descending order, and the median wavenumber is extracted as the wavenumber at each measurement point. Based on the dispersion relationship of the tested specimen, the quantitative detection of the plate thickness in the detection area is realized. This method is first applied to the simulation model. Then it is applied to the defect imaging and quantitative detection of aluminum plates with rectangular groove defects and carbon fiber reinforced plastics (CFRP) plates with delamination defects. In simulation and experiment, the local wavenumber imaging method, the frequency domain instantaneous wavenumber imaging method, and the multi-time Lamb waves space wavenumber imaging method are used for defect imaging and quantification. The imaging results are compared and analyzed. The result shows that the multi-time Lamb waves space wavenumber imaging method can restore the morphology of groove defects in aluminum plates and delamination defects in CFRP plates, and accurately estimate the depth of groove defects and the location of delamination defects.
Keyword ：
Lamb waves Lamb waves delamination defect delamination defect quantitative evaluation quantitative evaluation space wavenumber imaging space wavenumber imaging laser ultrasound laser ultrasound
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| GB/T 7714 | Liu, Zenghua , Liu, Xiaoyu , Zhu, Yanping et al. Multi-time Lamb waves space wavenumber imaging method based on ultrasonic-guided wavefield [J]. | STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL , 2024 . |
| MLA | Liu, Zenghua et al. "Multi-time Lamb waves space wavenumber imaging method based on ultrasonic-guided wavefield" . | STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL (2024) . |
| APA | Liu, Zenghua , Liu, Xiaoyu , Zhu, Yanping , Lu, Zhaojing , Chen, Long , Wu, Bin et al. Multi-time Lamb waves space wavenumber imaging method based on ultrasonic-guided wavefield . | STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL , 2024 . |
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Abstract ：
陶瓷基复合材料(Ceramic matrix composites,CMC)具有密度低和耐高温等一系列优点，广泛应用于飞机机翼前缘与先进燃气涡轮发动机等部件。由于在其生产过程中存在着制作工艺多样和制作步骤繁复等因素影响，材料内部不可避免地会存留缺陷，这对材料质量稳定性以及可靠性都造成了不可忽视的影响。针对其内部缺陷检测的迫切需求，基于太赫兹时域光谱(Terahertz time-domain spectroscopy,THz-TDS)技术具有信息量丰富、时间分辨率高的优势，提出一种用于CMC内部缺陷无损检测的太赫兹检测方法。首先，采用反射式THz-TDS系统，对预制的CMC试样进行了非接触式无损检测，获得样品逐点扫描检测信号。然后，针对其高频信号在高阶滤波后常出现的明显相位延迟现象，提出一种零相位滤波方法，消除相位延迟并精确提取出峰值、相位与渡越时间等信息。在此基础上，采用多特征加权融合成像方法绘制材料缺陷的二维表面成像结果，并重构与其对应的缺陷三维形貌图，直观展示出了缺陷形貌位置信息，最终实现了CMC试样的缺陷定位与尺寸定量评估。
Keyword ：
零相位滤波 零相位滤波 缺陷检测 缺陷检测 融合成像 融合成像 陶瓷基复合材料 陶瓷基复合材料 太赫兹波谱 太赫兹波谱
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| GB/T 7714 | 刘增华 , 吴育衡 , 王可心 et al. 基于太赫兹时域光谱技术的陶瓷基复合材料缺陷检测成像研究 [J]. | 机械工程学报 , 2023 , 59 (14) : 33-42 . |
| MLA | 刘增华 et al. "基于太赫兹时域光谱技术的陶瓷基复合材料缺陷检测成像研究" . | 机械工程学报 59 . 14 (2023) : 33-42 . |
| APA | 刘增华 , 吴育衡 , 王可心 , 满润昕 , 何存富 , 吴斌 . 基于太赫兹时域光谱技术的陶瓷基复合材料缺陷检测成像研究 . | 机械工程学报 , 2023 , 59 (14) , 33-42 . |
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Abstract ：
In the ultrasonic testing of the mechanical properties of ferromagnetic materials, the main excitation mechanism modes of ultrasonic waves are Lorentz force mechanism ultrasonic and magnetostriction mechanism ultrasonic. Lorentz force mechanism ultrasonic mainly detects the conductive characteristics of materials, while magnetostriction mechanism ultrasonic mainly detects the hysteresis characteristics of materials. However, conventional electromagnetic acoustic transducers (EMATs) cannot simultaneously characterise these two characteristics of ferromagnetic materials. In this study, we conclude from the finite element simulation that a quantitative lift-off distance (i.e. the distance between EMAT and the specimen) can change the main mechanism mode of the excited ultrasonic wave. Based on this conclusion, an electromagnet electromagnetic acoustic transducer with dual main excitation modes (DM-E-EMAT) is designed, which can realise the dual mode switching of the main Lorentz force mechanism and main magnetostriction mechanism by adding or removing hollow square gasket. The ultrasonic testing of ferromagnetic materials based on the two main mechanisms of DM-E-EMAT can simultaneously characterise the conductivity and magnetostriction properties of ferromagnetic materials, which enables the characterisations of two types of characteristic parameters with one transducer, improves the efficiency of electromagnetic ultrasonic non-destructive testing of the mechanical properties and reduces the detection errors of ferromagnetic material.
Keyword ：
Electromagnetic acoustic transducer Electromagnetic acoustic transducer Lorentz force mechanism ultrasonic Lorentz force mechanism ultrasonic ferromagnetic material ferromagnetic material mechanical property mechanical property magnetostriction mechanism ultrasonic magnetostriction mechanism ultrasonic
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| GB/T 7714 | Zhang, Peiying , Liu, Zenghua , Guo, Yanhong et al. Development of dual-main excitation mechanism modes electromagnet EMAT for testing ferromagnetic materials [J]. | NONDESTRUCTIVE TESTING AND EVALUATION , 2023 . |
| MLA | Zhang, Peiying et al. "Development of dual-main excitation mechanism modes electromagnet EMAT for testing ferromagnetic materials" . | NONDESTRUCTIVE TESTING AND EVALUATION (2023) . |
| APA | Zhang, Peiying , Liu, Zenghua , Guo, Yanhong , Wang, Xiaosai , Gong, Yu . Development of dual-main excitation mechanism modes electromagnet EMAT for testing ferromagnetic materials . | NONDESTRUCTIVE TESTING AND EVALUATION , 2023 . |
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Abstract ：
The key parts of ferromagnetic materials that have served in high temperature environment for a long time are prone to cracks, and the growth of cracks seriously threatens the safe operation of the components. Aiming at the surface crack defects of ferromagnetic materials, based on numerical simulation, this study uses wideband ultrasonic surface waves to carry out nondestructive evaluation of surface crack defects. The wideband ultrasonic surface waves are generated and received by the wideband ultrasonic surface waves transducers. Based on time-frequency analysis method, the interaction law between ultrasonic surface wave with different frequency components and surface crack defects is studied. Ultrasonic characteristic parameters with different frequency components are extracted, and a neural network model with ultrasonic characteristic parameters as input and surface crack defects information as output is constructed to evaluate surface cracks defects. The results show when the crack length is between the wavelength depth of high-frequency ultrasonic surface waves and the wavelength depth of low-frequency ultrasonic surface waves, the prediction error of crack length is large. The prediction error of crack length can be reduced and the ability of nondestructive evaluation of surface crack defects can be improved when using wideband ultrasonic characteristic parameters for crack nondestructive evaluation.
Keyword ：
surface crack defect surface crack defect ultrasonic characteristic parameter ultrasonic characteristic parameter ultrasonic surface waves ultrasonic surface waves nondestructive evaluation nondestructive evaluation ferromagnetic material ferromagnetic material
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| GB/T 7714 | Liu, Zenghua , Guo, Yanhong , Zhao, Xin . NUMERICAL SIMULATION STUDY ON NONDESTRUCTIVE EVALUATION OF SURFACE CRACK DEFECTS OF FERROMAGNETIC MATERIALS BY WIDEBAND ULTRASONIC SURFACE WAVES [J]. | PROCEEDINGS OF 2023 50TH ANNUAL REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, QNDE2023 , 2023 . |
| MLA | Liu, Zenghua et al. "NUMERICAL SIMULATION STUDY ON NONDESTRUCTIVE EVALUATION OF SURFACE CRACK DEFECTS OF FERROMAGNETIC MATERIALS BY WIDEBAND ULTRASONIC SURFACE WAVES" . | PROCEEDINGS OF 2023 50TH ANNUAL REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, QNDE2023 (2023) . |
| APA | Liu, Zenghua , Guo, Yanhong , Zhao, Xin . NUMERICAL SIMULATION STUDY ON NONDESTRUCTIVE EVALUATION OF SURFACE CRACK DEFECTS OF FERROMAGNETIC MATERIALS BY WIDEBAND ULTRASONIC SURFACE WAVES . | PROCEEDINGS OF 2023 50TH ANNUAL REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, QNDE2023 , 2023 . |
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Abstract ：
针对复合材料层合板中耦合Lamb波的传播问题,基于分层模型提出解析建模与有限元数值模拟相结合的方法对其进行预测和评估.利用Legendre正交多项式展开法推导多层各向异性复合材料层合板中耦合Lamb波的控制方程,并对频率-波数域频散特性曲线实现数值求解.基于平面壳单元构建复合材料层合板的有限元模型,采用波结构加载法生成单一Lamb波基本模态,设计复合材料层合板的不同纤维取向、边界和界面约束条件,并经二维傅里叶变换获得有限元模拟数据的频率-波数域频散特性曲线.通过对比验证,结果表明两种方法均有较好的吻合性.
Keyword ：
有限元 有限元 复合材料 复合材料 频散 频散 Lamb波 Lamb波 Legendre正交多项式 Legendre正交多项式
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| GB/T 7714 | 张旭 , 刘宏业 , 李璇 et al. 基于分层模型的复合材料耦合Lamb波频率-波数域特性研究 [J]. | 测控技术 , 2023 , 42 (5) : 66-72 . |
| MLA | 张旭 et al. "基于分层模型的复合材料耦合Lamb波频率-波数域特性研究" . | 测控技术 42 . 5 (2023) : 66-72 . |
| APA | 张旭 , 刘宏业 , 李璇 , 施展 , 刘增华 . 基于分层模型的复合材料耦合Lamb波频率-波数域特性研究 . | 测控技术 , 2023 , 42 (5) , 66-72 . |
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Abstract ：
超声导波检测技术是新型的无损检测方法之一.水平剪切(SH)导波是超声导波的一种.在板和管结构的检测中,SH导波检测技术占据着越来越重要的位置.电磁声传感器(EMAT)常被用于SH导波的激励或接收.SH-EMAT具有适应性强、效率高的特点,基于SH-EMAT检测技术的应用场景越来越多.以近十几年的相关文献为基础,介绍了SH-EMAT设计以及SH导波缺陷检测技术的研究现状和进展,提供了SH导波检测在不同应用背景下的传感器选择,总结了不同频率SH导波的检测能力,分析了不同SH导波检测技术的优缺点.同时还对电磁超声水平剪切导波检测的未来研究趋势进行了展望,为相关研究人员提供了研究方向和思路.
Keyword ：
水平剪切导波 水平剪切导波 信号处理 信号处理 EMAT EMAT 缺陷检测 缺陷检测 阵列技术 阵列技术
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| GB/T 7714 | 刘增华 , 洪泽汇 , 吴斌 et al. 电磁超声水平剪切导波的缺陷检测研究进展 [J]. | 测控技术 , 2023 , 42 (5) : 28-36 . |
| MLA | 刘增华 et al. "电磁超声水平剪切导波的缺陷检测研究进展" . | 测控技术 42 . 5 (2023) : 28-36 . |
| APA | 刘增华 , 洪泽汇 , 吴斌 , 何存富 . 电磁超声水平剪切导波的缺陷检测研究进展 . | 测控技术 , 2023 , 42 (5) , 28-36 . |
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