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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 ：
A vibration isolator based on a tunable negative stiffness mechanism combines the advantages of high-staticlow-dynamic stiffness (HSLDS) isolators to expand the isolation frequency band and variable stiffness isolators to suppress resonance. In this paper, a novel tunable negative stiffness spring using Maxwell normal stress (SMNS) is proposed. The stiffness tunable range and energy utilization efficiency are greatly improved due to the newly designed magnetic circuit. Moreover, the electromagnetic negative stiffness device has the advantages of no friction, no backlash, compact structure and easy control. An analytical model of the electromagnetic force is built based on magnetic circuit analysis, and the parameter analysis is performed. An HSLDS isolator is constructed by connecting the SMNS in parallel with a linear isolator. The stiffness and vibration isolation performance are measured. The experimental results show that the SMNS produces an online tunable negative stiffness, which expands the isolation bandwidth and significantly improves the vibration isolation performance.
Keyword ：
Electromagnetic spring Electromagnetic spring High-static-low-dynamic stiffness High-static-low-dynamic stiffness Vibration control Vibration control Tunable negative stiffness Tunable negative stiffness
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| GB/T 7714 | Yuan, Shujin , Sun, Yi , Wang, Min et al. Tunable negative stiffness spring using maxwell normal stress [J]. | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES , 2021 , 193 . |
| MLA | Yuan, Shujin et al. "Tunable negative stiffness spring using maxwell normal stress" . | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 193 (2021) . |
| APA | Yuan, Shujin , Sun, Yi , Wang, Min , Ding, Jiheng , Zhao, Jinglei , Huang, Yining et al. Tunable negative stiffness spring using maxwell normal stress . | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES , 2021 , 193 . |
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Abstract ：
A dual-mesh three characteristic lines method was proposed for stress wave propagation through a microdefected rock mass containing a thin-layer filled macrojoint. The dual-mesh three characteristic lines are composed of five basic elements that are used to calculate stress wave propagation at the boundary and the interior of the microdefected rock mass and the left side, interior and right side of the filled macrojoint. The results of the present study were compared with that of available analytical results that do not consider microdefects and do not consider microdefects and macrojoint thickness. The results show that the proposed method can be used to efficiently investigate the effect of microdefects and filled macrojoints on wave propagation. The results also show that the viscosity coefficient in the equivalent viscoelastic model of the microdefected rock mass, the viscosity coefficient in the equivalent viscoelastic model of the filled macrojoint and the thickness of the filled macrojoint have significant effects on stress wave attenuation. The transmission coefficient initially decreases and then increases as the viscosity coefficient in the equivalent viscoelastic model of the microdefected rock mass increases. The transmission coefficient increases and then tends to flatten as the viscosity coefficient in the equivalent viscoelastic model of the filled macrojoint increases. The transmission coefficient decreases as the thickness of the filled macrojoint increases.
Keyword ：
Dual-mesh three characteristic lines method Dual-mesh three characteristic lines method Rock mass Rock mass Microdefect Microdefect Stress wave propagation Stress wave propagation Filled macrojoint Filled macrojoint
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| GB/T 7714 | Fan, L. F. , Wang, M. , Du, X. L. . Dual-Mesh Three Characteristic Lines Method for Stress Wave Propagation Through a Microdefected Rock Mass with a Thin-Layer Filled Macrojoint [J]. | ROCK MECHANICS AND ROCK ENGINEERING , 2021 , 54 (12) : 6621-6632 . |
| MLA | Fan, L. F. et al. "Dual-Mesh Three Characteristic Lines Method for Stress Wave Propagation Through a Microdefected Rock Mass with a Thin-Layer Filled Macrojoint" . | ROCK MECHANICS AND ROCK ENGINEERING 54 . 12 (2021) : 6621-6632 . |
| APA | Fan, L. F. , Wang, M. , Du, X. L. . Dual-Mesh Three Characteristic Lines Method for Stress Wave Propagation Through a Microdefected Rock Mass with a Thin-Layer Filled Macrojoint . | ROCK MECHANICS AND ROCK ENGINEERING , 2021 , 54 (12) , 6621-6632 . |
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Abstract ：
It is well-known that second-order optimizer can accelerate the training of deep neural networks, however, the huge computation cost of second-order optimization makes it impractical to apply in real practice. In order to reduce the cost, many methods have been proposed to approximate a second-order matrix. Inspired by KFAC, we propose a novel Trace-based Hardware-driven layer-ORiented Natural Gradient Descent Computation method, called THOR, to make the second-order optimization applicable in the real application models. Specifically, we gradually increase the update interval and use the matrix trace to determine which blocks of Fisher Information Matrix (FIM) need to be updated. Moreover, by resorting the power of hardware, we have designed a hardware-driven approximation method for computing FIM to achieve better performance. To demonstrate the effectiveness of THOR, we have conducted extensive experiments. The results show that training ResNet-50 on ImageNet with THOR only takes 66.7 minutes to achieve a top-1 accuracy of 75.9 % under an 8 Ascend 910 environment with MindSpore, a new deep learning computing framework. Moreover, with more computational resources, THOR can only takes 2.7 minutes to 75.9 % with 256 Ascend 910.
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| GB/T 7714 | Chen, Mengyun , Gao, Kaixin , Liu, Xiaolei et al. THOR, Trace-Based Hardware-Driven Layer-Oriented Natural Gradient Descent Computation [C] . 2021 : 7046-7054 . |
| MLA | Chen, Mengyun et al. "THOR, Trace-Based Hardware-Driven Layer-Oriented Natural Gradient Descent Computation" . (2021) : 7046-7054 . |
| APA | Chen, Mengyun , Gao, Kaixin , Liu, Xiaolei , Wang, Zidong , Ni, Ningxi , Zhang, Qian et al. THOR, Trace-Based Hardware-Driven Layer-Oriented Natural Gradient Descent Computation . (2021) : 7046-7054 . |
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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 ：
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 ：
The multiple pulses propagation through rock mass with micro-defect and macro-joint was investigated. The traditional split three characteristic lines method was modified by considering the different mechanical behaviors of macro-joint under multiple pulses, which is characterized by the cyclic loading Barton-Bandis (BB) model. The effects of time interval, frequency and amplitude of multiple pulses on the transmission coefficient, effective velocity and energy transmission coefficient were investigated. The results show that the effects of time interval on the transmission coefficient and effective velocity of the head pulse can be neglected, while the effect on energy transmission coefficient of the head pulse cannot be neglected, and the energy transmission coefficient of the head pulse increases as the increase of the time interval. On the other hand, the transmission coefficient, effective velocity and energy transmission coefficient of the subsequent pulses all decreases as the increase of the time interval. In addition, the effective velocity of head pulse is significantly affected by frequency, while that of subsequent pulses is less affected by frequency. The transmission coefficient and energy transmission coefficient of head pulse and subsequent pulses are significantly affected by frequency. The transmission coefficient, the effective velocity and the energy transmission coefficient of head pulse are significantly affected by amplitude, while those of subsequent pulses are less affected by amplitude. © 2021 Elsevier Ltd
Keyword ：
Rocks Rocks Rock mechanics Rock mechanics Velocity Velocity Transmissions Transmissions
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| GB/T 7714 | Fan, L.F. , Wang, M. , Li, J.C. . Multiple pulses transmission through rock mass with double-scale discontinuities [J]. | International Journal of Rock Mechanics and Mining Sciences , 2021 , 140 . |
| MLA | Fan, L.F. et al. "Multiple pulses transmission through rock mass with double-scale discontinuities" . | International Journal of Rock Mechanics and Mining Sciences 140 (2021) . |
| APA | Fan, L.F. , Wang, M. , Li, J.C. . Multiple pulses transmission through rock mass with double-scale discontinuities . | International Journal of Rock Mechanics and Mining Sciences , 2021 , 140 . |
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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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