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学者姓名：王民
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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 ：
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 ：
In order to eliminate the calculation error of the Hertzian elastohydrodynamic contact stress due to the asymmetry of the contact region of the helix raceway, a non-Hertzian elastohydrodynamic contact stress calculation method based on the minimum excess principle was proposed. Firstly, the normal contact stresses of the screw raceway and the nut raceway were calculated by the Hertzian contact theory and the minimum excess principle, respectively. Subsequently, the Hertzian solution and the non-Hertzian solution of the elastohydrodynamic contact stress could be determined by the Reynolds equation under different helix angles and screw speeds. Finally, the friction torque test of the double-nut ball screws was designed and implemented on a self-designed bed for validation of the proposed method. The comparison showed that the experimental friction torque was the good agreement with the simulated friction torque, which verified the effectiveness and correctness of the non-Hertzian elastohydrodynamic contact stress calculation method. Under the large helix angle, the calculation accuracy of asperity contact stress for the non-Hertzian solution was more accurate than that of the Hertzian solution at the contact region of ball screws. Therefore, the non-Hertzian elastohydrodynamic contact stress considering the asymmetry of the raceway contact region could more accurately analyze the wear depth of the high-speed ball screws.
Keyword ：
minimum excess principle minimum excess principle elastohydrodynamic lubrication elastohydrodynamic lubrication contact stress contact stress ball screws ball screws non-Hertzian contact non-Hertzian contact
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| GB/T 7714 | Sun, Tiewei , Wang, Min , Gao, Xiangsheng et al. Non-Hertzian Elastohydrodynamic Contact Stress Calculation of High-Speed Ball Screws [J]. | APPLIED SCIENCES-BASEL , 2021 , 11 (24) . |
| MLA | Sun, Tiewei et al. "Non-Hertzian Elastohydrodynamic Contact Stress Calculation of High-Speed Ball Screws" . | APPLIED SCIENCES-BASEL 11 . 24 (2021) . |
| APA | Sun, Tiewei , Wang, Min , Gao, Xiangsheng , Zhao, Yingjie . Non-Hertzian Elastohydrodynamic Contact Stress Calculation of High-Speed Ball Screws . | APPLIED SCIENCES-BASEL , 2021 , 11 (24) . |
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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 ：
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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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 ：
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 ：
Considering the complexity geometry and thin wall feature, the semiconical shell workpiece will induce complicated and intense vibration in the milling process leading to poor surface quality and large machining deformation. In order to suppress the vibration, this paper focused on the semiconical shell workpiece and proposed a multiple distribution tuned mass damper (MDTMD) vibration control technique by attaching a series of optimized tuned mass dampers (TMD) to each optimal position of workpiece. The vibration characteristics and modal shapes of workpiece were obtained with the use of spectro-geometric-Ritz method (SGM) and the dynamic model of workpiece with MDTMD was established. A novel design of TMD was proposed. The optimal parameters and positions of each TMD were determined simultaneously using numerical optimization algorithm based on the modal summation method. Theoretical studies and experiment results shown that the proposed MDTMD method can remarkably improve the dynamic stiffness of the workpiece. The performance of vibration suppression is further verified in the impact tests and milling experiments.
Keyword ：
Multiple distribution tuned mass damper Multiple distribution tuned mass damper Semiconical shell workpiece Semiconical shell workpiece Spectro-geometric-Ritz method Spectro-geometric-Ritz method Milling vibration control Milling vibration control
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| GB/T 7714 | Qin, Peng , Liu, Yunan , Wang, Min et al. Milling vibration control of semiconical shell workpiece with multiple distribution tuned mass dampers [J]. | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2021 , 115 (7-8) : 2175-2190 . |
| MLA | Qin, Peng et al. "Milling vibration control of semiconical shell workpiece with multiple distribution tuned mass dampers" . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 115 . 7-8 (2021) : 2175-2190 . |
| APA | Qin, Peng , Liu, Yunan , Wang, Min , Zhang, Yanlin . Milling vibration control of semiconical shell workpiece with multiple distribution tuned mass dampers . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2021 , 115 (7-8) , 2175-2190 . |
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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 ：
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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