检索结果-内蒙古大学图书馆

Research on Fatigue Detection and Remaining Life Prediction of High-Strength Steel Based on Nonlinear Guided Waves

Journal of Materials engineering and Performance 2025年 1-7页

作者： Quan, Silong Zhang, Yuhua School of Mechanical and Electronic Engineering East China University of Technology Nanchang330013 China Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology Guangxi University Nanning530003 China

In the realm of automotive lightweight design, high-strength steel offers the dual benefits of cost efficiency and social welfare by enabling weight reduction without incurring additional expenses. However, high-strength steel plates are prone to fatigue damage after being subjected to repeated loads, which poses a significant risk to the stability and longevity of vehicle performance. As a result, the health monitoring and life assessment of high-strength steel components are particularly crucial. This research leverages nonlinear ultrasonic guided wave technology to conduct both online and offline experiments on Q460 high-strength steel, delving into the correlation between nonlinear ultrasonic parameters and the fatigue life of the material. The experiments indicate that nonlinear ultrasonic parameters initially rise and then fall as the fatigue life increases, reaching a peak when the fatigue life is at 60%. Moreover, based on the relationship model between nonlinear ultrasonic parameters and fatigue life, a preliminary method for assessing the fatigue remaining life has been established. This method utilizes the material's nonlinear ultrasonic parameters to predict its remaining fatigue life. The insights gained from this study provide a viable technical solution for the damage assessment and life prediction of Q460 high-strength steel. © ASM International 2025.

关键词： Fatigue damage

来源：评论

学校读者我要写书评

暂无评论

Numerical Simulation of Flow Field around NACA 0012 Airfoil at Low Reynold’s Number Assuming Mars Environment using OpenFoam

Numerical Simulation of Flow Field around NACA 0012 Airfoil ...

引用

AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Okamoto, Atsushi Yamada, Takafumi Advanced Mechanical and Control System Engineering Course National Institute of Technology Tsuyama College 624-1 Okayama Numa Tsuyama708-8509 Japan Associate Professor Department of Integrated Science and Technology National Institute of Technology Tsuyama College 624-1 Okayama Numa Tsuyama708-8509 Japan

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

In this study, incompressible flow fields around a NACA0012 airfoil were numerically simulated at low Reynolds number for a Mars environment. For mesh generation, the standard Open FOAM utilities block Mesh and snappy HexMesh were used. Using those meshes and pisoFoam, which is PISO method-based analysis solver, NASA wind tunnel test conditions were numerically simulated in the Earth environment and obtained a similar lift gradient as in the experiment up to the stall. Then, the flow field of 12,000 Reynolds number, which simulates the Martian environment, was calculated. The variation of lift coefficient with increasing angle of attack was almost consistent with the experimental value in the Earth environment, and the stall angle was 16°. From the results of pressure distribution on the wing surface, it is suggested that compared to the Earth environment, the separation point movesfrom the leading edge to aft of the wing upper surface in the Martian environment. The flow field at the stall angle was similar to that of the Earth environment, and vortices were formed, however, their velocity vectors were very small, and dead water regions were observed near the trailing edge of the wing upper surface. More detailed aerodynamic characteristics should be clarified by evaluating the results using drag and moment coefficients until the SciTech Forum 2025. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： NASA

来源：评论

学校读者我要写书评

暂无评论

Multi-view fully connected graph to fuse multi-sensor signals for mechanical equipment remaining useful life prediction

引用

Journal of Manufacturing systems 2025年 80卷 1029-1052页

作者： Wu, Jinxin He, Deqiang Jin, Zhenzhen Zhao, Ming Li, Xianwang Chen, Yanjun Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology School of Mechanical Engineering Guangxi University Nanning530004 China State Key Laboratory of Heavy-duty and Express High-power Electric Locomotive Zhuzhou412001 China Guangxi Key Laboratory of Precision Navigation Technology and Application Guilin University of Electronic Technology 541004 China Guangxi Liugong Machinery Co. Ltd Liuzhou545007 China

Accurate remaining useful life prediction is essential for enhancing equipment reliability and optimizing maintenance strategies. However, existing methods struggle to effectively integrate multi-sensor data while quantifying uncertainty. To address these challenges, a multi-view fully connected graph neural network is proposed for multi-sensor mechanical equipment remaining useful life prediction. Firstly, local fully connected graphs and global graphs are constructed to comprehensively characterize the multi-view spatial correlations from global and local views. Meanwhile, the graph convolution operations are performed on local and global graphs to extract the intricate spatial dependencies within multi-sensor signals. Then, the learned multi-view spatial representations are fed into the temporal convolutional network to capture the temporal dependencies across sensor timestamps. Finally, a joint optimization network is developed to simultaneously predict the remaining useful life and its associated prediction interval, enabling uncertainty quantification. Extensive experiments on two multi-sensor monitoring degradation datasets demonstrate the superior performance of the proposed model, offering valuable technical support for predictive maintenance. © 2025 The Society of Manufacturing Engineers

关键词： Predictive maintenance

来源：评论

学校读者我要写书评

暂无评论

Effect of silica particle size on the viscosity, curing behavior, and sintering performance of silica/alumina ceramic suspensions for digital light processing-based vat photopolymerization

引用

Ceramics International 2025年

作者： Liu, Fei Xu, Qingzhi Qu, Jingjing Huang, Yuntao Ma, Jianping Lin, Lifu Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology Guilin University of Electronic Technology Guilin541004 China School of Mechanical and Electrical Engineering Guilin University of Electronic Technology Guilin541004 China School of Mechanical and Electrical Engineering Guilin University of Aerospace Technology Guilin541004 China

This study systematically examined the effect of silica particle size on the viscosity, curing behavior, and sintering properties of silica/alumina ceramic suspensions. The suspension with 200 nm silica has a significantly higher viscosity than those with 500 nm and 1 μm silica. During digital light processing-based vat photopolymerization (VPP), the suspension with 200 nm silica exhibited the lowest cure depth and cure width. The sample's shrinkage and densification after sintering at different temperatures were also analyzed. At the same temperature, the silica particle size only weakly affected the shrinkage and densification. However, X-ray diffraction analysis of sintered samples revealed that a smaller particle size significantly facilitated the formation of the mullite phase. Finally, high-quality mullite ceramics with clear outlines were successfully prepared. This research provides an experimental foundation for the in-situ synthesis of complex mullite ceramic structures using VPP. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： X ray diffraction analysis

来源：评论

学校读者我要写书评

暂无评论

Degradation state prediction of IGBT based on optimized variational mode decomposition and hybrid models

引用

Electrical engineering 2025年 1-21页

作者： He, Deqiang Wang, Yanbo Wu, Jinxin Jin, Zhenzhen Zhao, Ming Chen, Yanjun State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology School of Mechanical Engineering Guangxi University Nanning530004 China Guangxi Liugong Machinery Co. Ltd Liuzhou545007 China State Key Laboratory of Heavy-Duty and Express High-Power Electric Locomotive Zhuzhou412001 China Guangxi Key Laboratory of Precision Navigation Technology and Application Guilin University of Electronic Technology Guilin541004 China

The insulated gate bipolar transistor (IGBT) is critical in motor drivers. Prolonged operation can lead to gradual degradation, adversely affecting motor operation and system performance. Therefore, accurate IGBT degradation state prediction (DSP) is essential for the timely maintenance and stable operation of motor drivers. The existing methods make it difficult to effectively deal with complex original degradation data, resulting in low DSP accuracy. To solve this issue, an improved method called ISSA-VMD-FDE based on optimized variational mode decomposition (VMD) and hybrid models is presented. Initially, the improved sparrow search algorithm (ISSA) is employed to optimize the VMD with minimum envelope entropy to obtain the key parameter combinations affecting VMD performance. Subsequently, the optimized VMD decomposes the IGBT degradation state data into multiple intrinsic mode functions (IMFs) and calculates each IMF’s fluctuation-based dispersion entropy (FDE). Based on the magnitude of FDE, the IMFs are categorized into high-frequency and low-frequency components. Finally, different models are applied to predict the high-frequency and low-frequency components separately, and the predictions are combined to yield the final DSP results. Experimental results demonstrate that the proposed prediction method exhibits strong predictive performance and reduces the MAPE by 89.41% compared to conventional methods, effectively supporting predictive maintenance and ensuring the reliable operation of IGBT. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.

关键词： Insulated gate bipolar transistors (IGBT)

来源：评论

学校读者我要写书评

暂无评论

Point-Plane Better than Point-Point – for Embedding-based USAD 8

Point-Plane Better than Point-Point – for Embedding-based U...

引用

8th International Conference on Video and Image Processing, ICVIP 2024

作者： Zhao, Zhirong Zhang, Yuanhao Yu, Zujun Zhu, Liqiang Science and-Technology Department Guoneng Shuohuang Railway Development Co Ltd. Cangzhou Cangzhou062350 China Frontiers Science Center for Smart High-Speed Rail System Beijing Jiaotong University Beijing100044 China State Key Laboratory of Advanced Rail Autonomous Operation Beijing Jiaotong University Beijing100044 China School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Beijing100044 China

ISBN: (数字)9781510689244

ISBN: (纸本)9781510689237

As deep neural networks (DNNs) have advanced, high-quality pre-trained models have provided excellent feature extraction methods for embedding-based unsupervised anomaly detection (EUSAD). However, when calculating anomaly scores, common EUSAD models often rely on point-to-point distance computations between test features and reference features. This approach not only fails to fully utilize the carefully integrated reference feature library but may also increase pixel-level false positives due to the incorrect selection of reference points. To address this issue, this paper adopts the least squares method, evaluating anomalies by calculating the distance between test feature points and the reference feature plane. Experimental results demonstrate that this method not only performs well in global image detection but also significantly reduces pixel-level false positives, showing strong performance across many anomaly detection datasets. © 2025 SPIE.

关键词： Pixels

来源：评论

学校读者我要写书评

暂无评论

Double Hilbert transform based nonlinear harmonics correction for fringe projection profilometry

引用

Optik 2025年 327卷

作者： Wang, Beibei sun, Huanghe Huang, Chaoguang Huang, Wenbin Wang, Haijian Li, Wenjie Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology School of Mechanical and Electrical Engineering Guilin University of Electronic Technology Guilin541004 China Engineering Research Center of Digital Imaging and Display Ministry of Education Soochow University Suzhou215006 China Guilin Kenvin Peter Technology Co. Ltd. Guilin541001 China

Fringe projection profilometry (FPP) has the advantages of large field of view, high precision and resolution, and is widely used in industrial inspection, medical treatment, aerospace and other fields. The nonlinear response between the camera and the projector in the system will affect the sinusoidal intensity of the captured fringe images, produce periodic phase errors, and affect the final reconstruction accuracy. Traditional double N-step phase shift (NPS) and Hilbert transform (HT) methods only correct the fundamental harmonic part of the phase nonlinear errors, and ignore the rest of the higher harmonic. Therefore, a double HTs based nonlinear phase error correction method is proposed, taking the higher order nonlinear harmonics into account. The artificial sinusoidal fringe images without background term are constructed using the wrapped phase calculated by captured fringe images. Then the HT is performed to convert the phase error to multiplication from addition, which can realize error balance in phase calculation. After obtaining the new phase, reoperation of artificial fringe generation and HT (AHT) is carried out to effectively remove the high order harmonic part of nonlinear harmonics. In proposed method, the wrapped phase calculated by captured fringe images is directly used to generate the artificial fringe images, which does not require additional projection patterns and realize real-time correction of phase nonlinear errors with high accuracy. Furthermore, direct artificial fringe generation also can efficiently avoids the effect of background intensity to the HT. Theoretical analysis, simulation analysis and experimental verification all prove the feasibility and superiority of the proposed method. © 2025 Elsevier GmbH

关键词： Harmonic analysis

来源：评论

学校读者我要写书评

暂无评论

Bauschinger effect in nano-grinding of 3C-SiC: A molecular dynamics study

引用

Wear 2025年

作者： Zhao, Xiangyang Tang, Yunqing Chen, Keyang Cai, Yukui Liang, Xiaoliang Liu, Zhanqiang Li, Dongyang School of Mechanical Engineering Shandong University Jinan250061 China State Key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong University Jinan250061 China Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education Jinan250061 China Key National Demonstration Center for Experimental Mechanical Engineering Education Jinan250061 China Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology Guilin University of Electronic Technology Guilin541004 China Department of Chemical and Materials Engineering University of Alberta EdmontonABT6G 2H5 Canada

The Bauschinger effect typically occurs in ductile materials and influences their tribological behaviors. However, this phenomenon is rarely reported in brittle materials. The nano-scale plastic deformation observed in brittle materials implies that the Bauschinger effect may also occur during their nano-tribological processes. In this study, molecular dynamics simulations were employed to evaluate the Bauschinger effect in cubic silicon carbide (3C-SiC) and its effect on nano-grinding of 3C-SiC. The results show that defects generated in 3C-SiC during shear deformation recover upon reversal of the shear direction, and defects near the surface of 3C-SiC workpiece generated during nano-grinding also recover upon reversal of the grinding direction, which validates the hypothesis that the Bauschinger effect may occur in 3C-SiC and could benefit its machinability. The Bauschinger effect during bi-directional grinding could help significantly reduce the damage and roughness to the surface of 3C-SiC and also help lower the machining resistance. Such benefits from the Bauschinger effect are found to be more pronounced at relatively lower temperatures, which makes the machinability of 3C-SiC during the bi-directional grinding at relatively lower temperatures comparable to that during the unidirectional grinding at higher temperatures. Therefore, taking advantage of the Bauschinger effect could help lower the operation temperature for high-quality and high-efficiency grinding of 3C-SiC with reduced defects, roughness, and resistance. This study provides an insight into the nano-tribological behaviors of brittle materials and demonstrates an effective approach for their ultra-precision machining. © 2025 Elsevier B.V.

关键词： Machinability

来源：评论

学校读者我要写书评

暂无评论

Correction to: Rapid Thermal Annealing under O2 Ambient to Recover the Deterioration by Gamma-Ray Irradiation in a-IGZO TFTs (electronic Materials Letters, (2025), 21, 1, (111-118), 10.1007/s13391-024-00526-8)

引用

electronic Materials Letters 2025年第2期21卷 289-289页

作者： Park, Minah Yoo, Jaewook Lee, Hongseung Song, Hyeonjun Kim, Soyeon Lim, Seongbin Park, Seohyeon Jeong, Jo Hak Kim, Bongjoong Lee, Kiyoung Lee, Yoon Kyeung Heo, Keun Kwon, Jiseok Bae, Hagyoul Department of Electronic Engineering Jeonbuk National University Jeonju54896 Korea Republic of Department of Semiconductor Science and Technology Jeonbuk National University Jeonju54896 Korea Republic of Department of Mechanical and System Design Engineering Hongik University Seoul04066 Korea Republic of Department of Materials Science and Engineering Hongik University Seoul04066 Korea Republic of Department of Advanced Materials Engineering Jeonbuk National University Jeonju54896 Korea Republic of School of Information Communications and Electronic Engineering The Catholic University of Korea Bucheon-si14662 Korea Republic of

In this article the Acknowledgements section was incorrectly given as ‘This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (2024-RS-2024-00439292 and No. 2022R1F1A1071914) and "Research Base Construction Fund Support Program" funded by Jeonbuk National University. The EDA tool was supported in part by the IC Design Education Center (IDEC).’ but should have been ‘This work was supported by the Nano & Material Technology Development Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (MSIT) (RS-2024-00460372), the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (2022R1F1A1071914), in part by the Institute of Information & Communications Technology Planning & Evaluation (IITP)-Innovative Human Resource Development for Local Intellectualization program grant funded by the Korean government (IITP-2024-RS-2024-00439292), and "Research Base Construction Fund Support Program" funded by Jeonbuk National University. The EDA tool was supported in part by the IC Design Education Center (IDEC)’. The original article has been corrected. © The Author(s) under exclusive licence to The Korean Institute of Metals and Materials 2024.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Vibration Transfer Function of Railway Vehicle system and its Spatial Coherence Under Vertical Track Irregularity Conditions

引用

Chinese Journal of mechanical engineering 2025年第2期 380-399页

作者： Peng Lu Xi Wang Yu Hou State Key Laboratory of Advanced Rail Autonomous Operation Beijing Jiaotong University Frontiers Science Center for Smart High-speed Railway System Beijing Jiaotong University School of Mechanical Electronic and Control EngineeringBeijing Jiaotong University

Current research on rail vehicle system vibrations primarily relies on numerical methods, with vibration transfer functions commonly derived through data fitting. However, the physical mechanisms underlying these vibrations are not well understood. To clarify the vibration transfer function and its characteristics, four basic input vectors are defined, and an analytical method is proposed. The vibration transfer functions of the vehicle system are solved, and their spatial coherence is analyzed. The results show that there are two spatial scales and four coherent modes in the vehicle system. The track irregularity wavelengths are combined with two spatial scales to alter the proportions of basic input vectors and then show the characteristics of spatial coherence. Four coherent modes are involved in wheel-rail force and primary suspension force; two coherent modes are involved in bogie vertical motion; and their dominant modes vary with the input frequency. On the other hand, the coherent modes involved in the bogie pitching motion and vehicle body motion are single and fixed over the whole range of frequency. This study presents an analytical method for the rapid solution of dynamic responses in vehicle systems and systematically analyzes the coherence behavior of vibration transfer functions with respect to tracking irregularity wavelengths.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：