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学者姓名：王民
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Abstract ：
针对滚珠丝杠副在低转速状态存在混合润滑导致丝杠滚道加速磨损的问题,基于等温弹流润滑理论建立了滚珠丝杠副弹流润滑接触模型研究滚珠与滚道间的摩擦机理和磨损形式.首先基于Frenet-Serret坐标转换方法建立丝杠与螺母的滚道曲面几何模型.其次基于Reynolds方程建立了滚珠丝杠副弹流润滑接触模型,求解了润滑油膜接触压力分布、油膜厚度分布和微凸体接触压力分布.最后从微观角度阐明了滚珠丝杠副的摩擦机理,其摩擦因数由微凸体接触摩擦因数和油膜润滑摩擦因数组成.实验结果表明:在低转速阶段丝杠滚道的磨损方式为黏着磨损和磨粒磨损,且模拟的摩擦因数曲线趋势和经典的Stribeck摩擦曲线趋势吻合较好,根据实测摩擦力矩准确识别了不同转速下滚珠丝杠副的摩擦因数和润滑状态.
Keyword ：
润滑状态 润滑状态 摩擦因数 摩擦因数 黏着磨损 黏着磨损 弹流润滑理论 弹流润滑理论 滚珠丝杠副 滚珠丝杠副 磨粒磨损 磨粒磨损
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| GB/T 7714 | 孙铁伟 , 王民 , 高相胜 et al. 基于等温弹流润滑理论的滚珠丝杠副摩擦机理研究 [J]. | 北京工业大学学报 , 2023 , 49 (1) : 1-10 . |
| MLA | 孙铁伟 et al. "基于等温弹流润滑理论的滚珠丝杠副摩擦机理研究" . | 北京工业大学学报 49 . 1 (2023) : 1-10 . |
| APA | 孙铁伟 , 王民 , 高相胜 , 赵英杰 . 基于等温弹流润滑理论的滚珠丝杠副摩擦机理研究 . | 北京工业大学学报 , 2023 , 49 (1) , 1-10 . |
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Abstract ：
本发明提供一种铣刀磨损监测方法及装置，该方法包括：采集铣削加工过程中机床主轴端的振动信号；选取有效铣削状态下的有效振动信号进行EEMD分解，以得到有效振动信号对应的多个IMF分量；根据各本征模态函数分量分别与有效振动信号的互信息系数和能量权重从多个IMF分量中选出主模态振动；计算所述主模态振动的瞬时幅值函数和瞬时频率函数；根据所述瞬时幅值函数和瞬时频率函数计算振动阻尼比；根据主轴旋转周期，选择旋转周期内对应的所述振动阻尼比计算一个旋转周期的平均阻尼比；以所述平均阻尼比作为铣刀磨损指标监测铣刀磨损过程，从而实现了对铣刀磨损过程有效地监测。
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| GB/T 7714 | 王民 , 杨斌 , 昝涛 et al. 铣刀磨损监测方法及装置 : CN202210292147.7[P]. | 2022-03-23 . |
| MLA | 王民 et al. "铣刀磨损监测方法及装置" : CN202210292147.7. | 2022-03-23 . |
| APA | 王民 , 杨斌 , 昝涛 , 高相胜 , 高鹏 . 铣刀磨损监测方法及装置 : CN202210292147.7. | 2022-03-23 . |
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Abstract ：
本实用新型提供了一种多关节臂超声振动脊柱钙化组织介入手术去除装置，包括沿前后方向固定连接的超声振动骨刀模块和多关节柔性臂模块；多关节柔性臂模块可弯曲运动地带动超声振动骨刀模块弯曲切割脊柱钙化骨组织。本实用新型切除效果好，效率高，出血少，能够对位置偏僻、结构复杂的脊柱钙化骨组织进行弯曲切削，减少手术风险、降低手术难度。
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| GB/T 7714 | 袁有 , 高鹏 , 金一丹 et al. 多关节臂超声振动脊柱钙化组织介入手术去除装置 : CN202223178042.3[P]. | 2022-11-25 . |
| MLA | 袁有 et al. "多关节臂超声振动脊柱钙化组织介入手术去除装置" : CN202223178042.3. | 2022-11-25 . |
| APA | 袁有 , 高鹏 , 金一丹 , 高瑞杰 , 王民 , 高相胜 et al. 多关节臂超声振动脊柱钙化组织介入手术去除装置 : CN202223178042.3. | 2022-11-25 . |
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Abstract ：
Mild cognitive impairment (MCI) detection using magnetic resonance image (MRI), plays a crucial role in the treatment of dementia disease at an early stage. Deep learning architecture produces impressive results in such research. Algorithms require a large number of annotated datasets for training the model. In this study, we overcome this issue by using layer-wise transfer learning as well as tissue segmentation of brain images to diagnose the early stage of Alzheimer's disease (AD). In layer-wise transfer learning, we used the VGG architecture family with pre-trained weights. The proposed model segregates between normal control (NC), the early mild cognitive impairment (EMCI), the late mild cognitive impairment (LMCI), and the AD. In this paper, 85 NC patients, 70 EMCI, 70 LMCI, and 75 AD patients access form the Alzheimer's Disease Neuroimaging Initiative (ADNI) database. Tissue segmentation was applied on each subject to extract the gray matter (GM) tissue. In order to check the validity, the proposed method is tested on preprocessing data and achieved the highest rates of the classification accuracy on AD vs NC is 98.73%, also distinguish between EMCI vs LMCI patients testing accuracy 83.72%, whereas remaining classes accuracy is more than 80%. Finally, we provide a comparative analysis with other studies which shows that the proposed model outperformed the state-of-the-art models in terms of testing accuracy.
Keyword ：
Transfer learning Transfer learning Image classification Image classification Early diagnosis Early diagnosis Alzheimer’s disease Alzheimer’s disease
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| GB/T 7714 | Mehmood Atif , Yang Shuyuan , Feng Zhixi et al. A Transfer Learning Approach for Early Diagnosis of Alzheimer's Disease on MRI Images. [J]. | Neuroscience , 2021 , 460 : 43-52 . |
| MLA | Mehmood Atif et al. "A Transfer Learning Approach for Early Diagnosis of Alzheimer's Disease on MRI Images." . | Neuroscience 460 (2021) : 43-52 . |
| APA | Mehmood Atif , Yang Shuyuan , Feng Zhixi , Wang Min , Ahmad Al Smadi , Khan Rizwan et al. A Transfer Learning Approach for Early Diagnosis of Alzheimer's Disease on MRI Images. . | Neuroscience , 2021 , 460 , 43-52 . |
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Abstract ：
In this paper, we discuss the superconvergence of the "interpolated" collocation solutions for weakly singular Volterra integral equations of the second kind. Based on the collocation solution u(h), two different interpolation postprocessing approximations of higher accuracy: I-2h(2m-1) u(h) based on the collocation points and I(2h)(m)u(h) based on the least square scheme are constructed, whose convergence order are the same as that of the iterated collocation solution. Such interpolation postprocessing methods are much simpler in computation. We further apply this interpolation postprocessing technique to hybrid collocation solutions and similar results are obtained. Numerical experiments are shown to demonstrate the efficiency of the interpolation postprocessing methods.
Keyword ：
Interpolation postprocessing Interpolation postprocessing Weakly singular kernels Weakly singular kernels Volterra integral equations Volterra integral equations Supercloseness Supercloseness Superconvergence Superconvergence Collocation Collocation Hybrid collocation Hybrid collocation
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| GB/T 7714 | Huang, Qiumei , Wang, Min . Superconvergence of interpolated collocation solutions for weakly singular Volterra integral equations of the second kind [J]. | COMPUTATIONAL & APPLIED MATHEMATICS , 2021 , 40 (3) . |
| MLA | Huang, Qiumei et al. "Superconvergence of interpolated collocation solutions for weakly singular Volterra integral equations of the second kind" . | COMPUTATIONAL & APPLIED MATHEMATICS 40 . 3 (2021) . |
| APA | Huang, Qiumei , Wang, Min . Superconvergence of interpolated collocation solutions for weakly singular Volterra integral equations of the second kind . | COMPUTATIONAL & APPLIED MATHEMATICS , 2021 , 40 (3) . |
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Abstract ：
The overall dynamic mechanical behavior of a double-scale discontinuous rock mass with a nonlinear deformational macrojoint was investigated. A method of combining the split three characteristic lines with the piecewise linear displacement discontinuity model (DDM) was proposed. The method was applied to investigate the transmission coefficient of P-wave propagation normally through a double-scale discontinuous rock mass with a nonlinear deformational macrojoint. The results were verified by comparison with the results of P-wave propagation normally through a double-scale discontinuous rock mass with a linear deformational macrojoint. The results showed that for a small amplitude stress wave, the nonlinear deformational macrojoint can be simplified as a linear deformational form to study the stress wave propagation, whereas for a large amplitude stress wave, the effects of the nonlinear deformational behavior of the macrojoint must be considered. The difference of the effects of nonlinear and linear deformational macrojoints on large amplitude stress wave propagation can be overlooked in the low-frequency or high-frequency regions. In addition, when the incident stress wave amplitude and initial macrojoint stiffness are sufficiently large, the effects of the nonlinear deformational macrojoint on stress wave propagation can be overlooked, and the effects of microdefects must be considered. The influence degree of microdefects on the stress wave propagation increases with the increase of incident stress wave frequency. © 2020, Springer-Verlag GmbH Austria, part of Springer Nature.
Keyword ：
Piecewise linear techniques Piecewise linear techniques Seismic waves Seismic waves Wave propagation Wave propagation Rocks Rocks Rock mechanics Rock mechanics
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| GB/T 7714 | Fan, L.F. , Wang, M. , Wu, Z.J. . Effect of Nonlinear Deformational Macrojoint on Stress Wave Propagation Through a Double-Scale Discontinuous Rock Mass [J]. | Rock Mechanics and Rock Engineering , 2021 , 54 (3) : 1077-1090 . |
| MLA | Fan, L.F. et al. "Effect of Nonlinear Deformational Macrojoint on Stress Wave Propagation Through a Double-Scale Discontinuous Rock Mass" . | Rock Mechanics and Rock Engineering 54 . 3 (2021) : 1077-1090 . |
| APA | Fan, L.F. , Wang, M. , Wu, Z.J. . Effect of Nonlinear Deformational Macrojoint on Stress Wave Propagation Through a Double-Scale Discontinuous Rock Mass . | Rock Mechanics and Rock Engineering , 2021 , 54 (3) , 1077-1090 . |
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Abstract ：
Bearing fault diagnosis that utilizes motor current has shown great potential for industrial application. For estimating fault sizes, this paper develop an electromechanical-magnetic coupling computational model of induction motor (IM) based on modified winding function approach (MWFA) in order to extract the fault-excited harmonic components and amplitudes in stator current. A new evaluating indicator FHD (Fault-excited Harmonic Distortion) is then proposed to describe the specific relation between fault sizes and severity of fault-excited harmonic distortion. The statistical results show that there is a fixed functional relation curve between FHD and fault sizes in different IM. Finally, an experimental IM with a known size built-in faulted bearing is investigated. The 1 mm artificial damage on outer raceway is recognized by calculating FHD (0.5636 in average) value and comparing with the simulated relation curve. The results validate the accuracy and robustness of the proposed approach in fault size estimation. © 2020
Keyword ：
Electric fault currents Electric fault currents Harmonic analysis Harmonic analysis Induction motors Induction motors Stators Stators Ball bearings Ball bearings Harmonic distortion Harmonic distortion
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| GB/T 7714 | Wang, Chen , Wang, Min , Yang, Bin et al. A novel methodology for fault size estimation of ball bearings using stator current signal [J]. | Measurement: Journal of the International Measurement Confederation , 2021 , 171 . |
| MLA | Wang, Chen et al. "A novel methodology for fault size estimation of ball bearings using stator current signal" . | Measurement: Journal of the International Measurement Confederation 171 (2021) . |
| APA | Wang, Chen , Wang, Min , Yang, Bin , Song, Kaiyu , Zhang, Yiling , Liu, Liming . A novel methodology for fault size estimation of ball bearings using stator current signal . | Measurement: Journal of the International Measurement Confederation , 2021 , 171 . |
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Abstract ：
When the stress wave propagates through rock mass with different wave impedances on two sides. It shows different reflection tendencies compared with the traditional study of wave propagation. A characteristic line method combined with the displacement discontinuity model was proposed to study the wave reflection through such rock mass. The effects of incident frequency, joint stiffness and wave impedance ratio on the reflection coefficient were discussed. The results show that the reflection coefficient increases as the wave impedance ratio increases. The traditional study of wave reflection can be regarded as a special case of the present study when the wave impedance ratio equals 1.0. Moreover, the difference of reflection coefficients decreases as the incident frequency increases, while increases as the joint stiffness and wave impedance ratio increase when the wave impedance ratio is larger than 1.0. When the wave impedance ratio is smaller than 1.0, the difference of reflection coefficients increases firstly and then decreases with the increase of incident frequency and joint stiffness, while decreases as the wave impedance ratio increases. For the cases of large incident frequency or small joint stiffness, the effects of wave impedance ratio can be neglected for the approximated prediction of wave reflection.
Keyword ：
jointed rock mass jointed rock mass > > wave impedance ratio wave impedance ratio reflection coefficient<break reflection coefficient<break amplitude attenuation amplitude attenuation Wave reflection Wave reflection
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| GB/T 7714 | Wang, L. J. , Wu, C. Q. , Fan, L. F. et al. Investigation of wave reflection at the joint with different wave impedances on two sides [J]. | WAVES IN RANDOM AND COMPLEX MEDIA , 2021 . |
| MLA | Wang, L. J. et al. "Investigation of wave reflection at the joint with different wave impedances on two sides" . | WAVES IN RANDOM AND COMPLEX MEDIA (2021) . |
| APA | Wang, L. J. , Wu, C. Q. , Fan, L. F. , Wang, M. . Investigation of wave reflection at the joint with different wave impedances on two sides . | WAVES IN RANDOM AND COMPLEX MEDIA , 2021 . |
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Abstract ：
With the development of space technology, the large scale space deployable antennas gradually become one of the key research themes of research. The basic requirements for large scale satellite antennas are the characteristics of light in weight and high in profile accuracy. The low-frequency and large-amplitude vibration of the large scale antennas is easily excited when working in an environment with zero gravity. In order to suppress the vibration of large scale deployable satellite antenna, a new type of damping mechanism with resetting capability is presented to improve the ability of vibration energy consumption and ensure the dynamic characteristics of the radial rib structure containing the presented profile accuracy of the antenna. The rod making up the deployment mechanism of the antennas is divided into two parts which connected by using the shape memory alloy (SMA) wires through guiding mechanism. Meanwhile, a metal rubber is fixed and pressed between two parts of the rod by SMA wires. The ability of the friction energy dissipation of the metal rubber is utilized to suppress the axial vibration of the rods. The super elasticity of the SMA wires is used to provide the restoring force for ensuring the dimensional stability of the rod. In this paper, the design principle of the axial self-resetting damping structure is introduced in detail. And, the dynamic characteristics of the radial rib structure containing the presented damping mechanism are investigated by using the software ANSYS. The simulation results show that the vibration amplitude of the radial rib of antennas has been reduced significantly. © Published under licence by IOP Publishing Ltd.
Keyword ：
Scales (weighing instruments) Scales (weighing instruments) Energy utilization Energy utilization Rubber Rubber Energy dissipation Energy dissipation Satellite antennas Satellite antennas Dynamics Dynamics Vibration control Vibration control Satellites Satellites Wire Wire Damping Damping Shape-memory alloy Shape-memory alloy
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| GB/T 7714 | Wang, Min , Liu, Jiaxing , Liu, Qinda et al. Research on Damping Mechanism with Resetting Capability for Axial Vibration Control of Satellite Antenna [C] . 2021 . |
| MLA | Wang, Min et al. "Research on Damping Mechanism with Resetting Capability for Axial Vibration Control of Satellite Antenna" . (2021) . |
| APA | Wang, Min , Liu, Jiaxing , Liu, Qinda , Zhao, Tingting , Zhang, Yunfei . Research on Damping Mechanism with Resetting Capability for Axial Vibration Control of Satellite Antenna . (2021) . |
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Abstract ：
高速滚珠丝杠副非赫兹接触应力计算
Keyword ：
接触应力 接触应力 最小余能原理 最小余能原理 赫兹接触 赫兹接触 共轭梯度法 共轭梯度法 滚珠丝杠副 滚珠丝杠副
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| GB/T 7714 | 王民 , 孙铁伟 , 董朝阳 et al. 高速滚珠丝杠副非赫兹接触应力计算 [J]. | 王民 , 2021 , 53 (2) : 178-186 . |
| MLA | 王民 et al. "高速滚珠丝杠副非赫兹接触应力计算" . | 王民 53 . 2 (2021) : 178-186 . |
| APA | 王民 , 孙铁伟 , 董朝阳 , 孔德顺 , 高相胜 , 工程科学与技术 . 高速滚珠丝杠副非赫兹接触应力计算 . | 王民 , 2021 , 53 (2) , 178-186 . |
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