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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 ：
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 ：
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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Abstract ：
This paper presents an investigation of wave propagation through granite after different high-temperature treatments by using a pendulum impact setup. Propagation coefficients (attenuation coefficient and wave number) were successfully introduced to describe the attenuation of longitudinal waves through granite after high-temperature treatment. The attenuation rate of the longitudinal wave through the granite after different high-temperature treatments was obtained. In addition, the effects of temperature, amplitude and wavelength of longitudinal waves on the propagation coefficient and attenuation rate were discussed. The experimental results show that the propagation coefficient and the attenuation rate increase with increasing temperature. The attenuation rate decreases with increasing wavelength, while the propagation coefficient is not influenced by the wavelength. Meanwhile, the propagation coefficient and the attenuation rate are not influenced by the amplitude of the longitudinal wave.
Keyword ：
High-temperature treatment High-temperature treatment Wave propagation Wave propagation Attenuation rate Attenuation rate Propagation coefficient Propagation coefficient Pendulum impact setup Pendulum impact setup
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| GB/T 7714 | Fan, L. F. , Yang, K. C. , Wang, M. et al. Experimental study on wave propagation through granite after high-temperature treatment [J]. | INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES , 2021 , 148 . |
| MLA | Fan, L. F. et al. "Experimental study on wave propagation through granite after high-temperature treatment" . | INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES 148 (2021) . |
| APA | Fan, L. F. , Yang, K. C. , Wang, M. , Wang, L. J. , Wu, Z. J. . Experimental study on wave propagation through granite after high-temperature treatment . | INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES , 2021 , 148 . |
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Abstract ：
Second-order optimization methods have the ability to accelerate convergence by modifying the gradient through the curvature matrix. There have been many attempts to use second-order optimization methods for training deep neural networks. In this work, inspired by diagonal approximations and factored approximations such as Kronecker-factored Approximate Curvature (KFAC), we propose a new approximation to the Fisher information matrix (FIM) called Trace-restricted Kronecker-factored Approximate Curvature (TKFAC), which can hold the certain trace relationship between the exact and the approximate FIM. In TKFAC, we decompose each block of the approximate FIM as a Kronecker product of two smaller matrices and scaled by a coefficient related to trace. We theoretically analyze TKFAC's approximation error and give an upper bound of it. We also propose a new damping technique for TKFAC on convolutional neural networks to maintain the superiority of second-order optimization methods during training. Experiments show that our method has better performance compared with several state-of-the-art algorithms on some deep network architectures.
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| GB/T 7714 | Gao, Kaixin , Liu, Xiaolei , Huang, Zhenghai et al. A Trace-restricted Kronecker-factored Approximation to Natural Gradient [C] . 2021 : 7519-7527 . |
| MLA | Gao, Kaixin et al. "A Trace-restricted Kronecker-factored Approximation to Natural Gradient" . (2021) : 7519-7527 . |
| APA | Gao, Kaixin , Liu, Xiaolei , Huang, Zhenghai , Wang, Min , Wang, Zidong , Xu, Dachuan et al. A Trace-restricted Kronecker-factored Approximation to Natural Gradient . (2021) : 7519-7527 . |
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Abstract ：
This paper investigates the equivalent viscoelastic behavior of granite after different high-temperature treatments under stress waves. The equivalent viscoelastic behavior of granite after different high-temperature treatments under dynamic conditions was investigated by the pendulum impact test, while its quasi-static behavior was investigated by the uniaxial compression test. The attenuation coefficient, wave number, storage modulus and loss modulus of granite after high-temperature treatments were determined based on the pendulum impact test. A modified three-element model was proposed to describe the relationship between the equivalent viscoelastic behavior of granite and temperature. The proposed model was validated by comparing the storage modulus and loss modulus predicted by the proposed model and those based on the pendulum impact test. The results show that the attenuation coefficient and wave number increase as temperature increases. While the storage modulus and loss modulus decrease as the temperature increases. The proposed model could describe the storage modulus and loss modulus of granite after high-temperature treatment with acceptable accuracy.
Keyword ：
Viscoelastic behavior Viscoelastic behavior Granite Granite Equivalent viscoelastic model Equivalent viscoelastic model High temperature High temperature Stress wave propagation Stress wave propagation
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| GB/T 7714 | Fan, L. F. , Yang, Q. H. , Wang, M. et al. Equivalent Viscoelastic Behavior of High-Temperature Granite Under Seismic Wave [J]. | ROCK MECHANICS AND ROCK ENGINEERING , 2021 , 55 (2) : 967-979 . |
| MLA | Fan, L. F. et al. "Equivalent Viscoelastic Behavior of High-Temperature Granite Under Seismic Wave" . | ROCK MECHANICS AND ROCK ENGINEERING 55 . 2 (2021) : 967-979 . |
| APA | Fan, L. F. , Yang, Q. H. , Wang, M. , Du, X. L. . Equivalent Viscoelastic Behavior of High-Temperature Granite Under Seismic Wave . | ROCK MECHANICS AND ROCK ENGINEERING , 2021 , 55 (2) , 967-979 . |
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Abstract ：
Thermal error of ball screws seriously affects the machining precision of computerized numerical control (CNC) machine tools especially in high speed and precision machining. Compensation technology is one of the most effective methods to address the thermal issue, and the effect of compensation depends on the accuracy and robustness of the thermal error model. Traditional modeling approaches have major challenges in time series thermal error prediction. In this paper, a novel thermal error model based on long short-term memory (LSTM) neural network and particle swarm optimization (PSO) algorithm is proposed. A data-driven model based on LSTM neural network is established according to the time series collected data. The hyperparameters of LSTM neural network are optimized by PSO, and then a PSO-LSTM model is established to precisely predict the thermal error of ball screws. In order to verify the effectiveness and robustness of the proposed model, two thermal characteristic experiments based on step and random speed are conducted on a self-designed test bench. The results show that the PSO-LSTM model has higher accuracy compared with the radial basis function (RBF) model and back propagation (BP) model with high robustness. The proposed method can be implemented to predict the thermal error of ball screws and provide a foundation for thermal error compensation.
Keyword ：
Thermal error Thermal error PSO-LSTM PSO-LSTM Data-driven Data-driven Modeling Modeling Ball screw Ball screw
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| GB/T 7714 | Gao, Xiangsheng , Guo, Yueyang , Hanson, Dzonu Ambrose et al. Thermal error prediction of ball screws based on PSO-LSTM [J]. | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2021 , 116 (5-6) : 1721-1735 . |
| MLA | Gao, Xiangsheng et al. "Thermal error prediction of ball screws based on PSO-LSTM" . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 116 . 5-6 (2021) : 1721-1735 . |
| APA | Gao, Xiangsheng , Guo, Yueyang , Hanson, Dzonu Ambrose , Liu, Zhihao , Wang, Min , Zan, Tao . Thermal error prediction of ball screws based on PSO-LSTM . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2021 , 116 (5-6) , 1721-1735 . |
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