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| 1 | Satellite lithium-ion battery remaining useful life estimation with an iterative updated RVM fused with the KF algorithm显示文摘Lithium-ion batteries have become the third-generation space batteries and are widely utilized in a series of spacecraft.Remaining Useful Life(RUL) estimation is essential to a spacecraft as the battery is a critical part and determines the lifetime and reliability.The Relevance Vector Machine(RVM) is a data-driven algorithm used to estimate a battery's RUL due to its sparse feature and uncertainty management capability.Especially, some of the regressive cases indicate that the RVM can obtain a better short-term prediction performance rather than long-term prediction.As a nonlinear kernel learning algorithm, the coefficient matrix and relevance vectors are fixed once the RVM training is conducted.Moreover, the RVM can be simply influenced by the noise with the training data.Thus, this work proposes an iterative updated approach to improve the long-term prediction performance for a battery's RUL prediction.Firstly, when a new estimator is output by the RVM, the Kalman filter is applied to optimize this estimator with a physical degradation model.Then, this optimized estimator is added into the training set as an on-line sample, the RVM model is re-trained, and the coefficient matrix and relevance vectors can be dynamically adjusted to make next iterative prediction.Experimental results with a commercial battery test data set and a satellite battery data set both indicate that the proposed method can achieve a better performance for RUL estimation. | Yuchen SONG Datong LIU Yandong HOU Jinxiang YU Yu PENG | 2018 | Chinese Journal of Aeronautics2018，31，1： | 29 |
| 2 | Warming effects on plant biomass allocation and correlations with the soil environment in an alpine meadow,China显示文摘Alpine meadow ecosystem is fragile and highly sensitive to climate change.An understanding of the allocation of above-and below-ground plant biomass and correlations with environmental factors in alpine meadow ecosystem can result in better protection and effective utilization of alpine meadow vegetation.We chose an alpine meadow in the Qinghai-Tibetan Plateau of China as the study area and designed experimental warming plots using a randomized block experimental design.We used single-tube infrared radiators as warming devices,established the warming treatments,and measured plant above- (AGB) and below-ground biomass (BGB) during the growing seasons (May to September) in 2012 and 2013.We determined the allocation of biomass and the relationship between biomass and soil environment under the warming treatment.Biomass indices including above-ground biomass,below-ground biomass and the ratio of root to shoot (R/S) ,and soil factors including soil moisture and soil temperature at different depths were measured.The results showed that (1) BGB of the alpine meadow had the most significant allometric correlation with its AGB (y=298.7x~ (0.44) ,P<0.001) ,but the relationship decreased under warming treatment and the determination coefficient of the functional equation was 0.102 which was less than that of 0.188 of the unwarming treatment (control) ; (2) BGB increased,especially in the deeper soil layers under warming treatment (P>0.05) .At 0–10 cm soil depth,the percentages of BGB under warming treatment were smaller than those of the control treatment with the decreases being 8.52% and 8.23% in 2012 and 2013,respectively.However,the BGB increased 2.13% and 2.06% in 2012 and 2013,respectively,at 10–50 cm soil depths; (3) BGB had significant positive correlations with soil moisture at 100 cm depth and with soil temperature at 20–100 cm depths (P<0.05) ,but the mean correlation coefficient of soil temperature was 0.354,greater than the 0.245 of soil moisture.R/S ratio had a significant negative correlation with soil temperature at 20 cm depth (P<0.05) .The warmer soil temperatures in shallow layers increased the biomass allocation to above-ground plant parts,which leading to the increase in AGB;whereas the enhanced thawing of frozen soil in deep layers causing by warming treatment produced more moisture that affected plant biomass allocation. | XU Manhou LIU Min XUE Xian ZHAI Datong | 2016 | Journal of Arid Land2016，8，5： | 12 |
| 3 | Microstructure and tensile behavior of hot extruded AZ91 alloys at room temperature显示文摘AZ91 alloys were prepared by hot extrusion and its microstructure and tensile behavior at room temperature were investigated. Compared to as-cast ingot, the grain size of hot-extruded material is morerefined, the intermetallic phase Mg17Al12 is broken and dispersed discontinuously. Both strength and elongation of AZ91 are improved by hotextrusion. Tensile behavior and fracture surface of the experimental material were studied. Due to the change in microstructure, the fracture mechanism of extruded material is different from that of as-cast ingot, the latter is mainly a brittle fracture. Ductile fracture plays arole in hot-extruded AZ91 failure at room temperature. | Yuanyuan Li, Datong Zhang, Ying Liu, Yan Long, and Weiping ChenCollege of Mechanical Engineering, South China University of Technology Guangzhou 510640, China | 2002 | Journal of University of Science and Technology Beijing2002，9，5： | 10 |
| 4 | Data-driven prognostics and remaining useful life estimation for lithium-ion battery: A Review显示文摘As an important and necessary part in the intelligent battery management systems(BMS),the prognostics and remaining useful life(RUL)estimation for lithium-ion batteries attach more and more attractions.Especially,the data-driven approaches use only the monitoring data and historical data to model the performance degradation and assess the health status,that makes these methods flexible and applicable in actual lithium-ion battery applications.At first,the related concepts and definitions are introduced.And the degradation parameters identification and extraction is presented,as the health indicator and the foundation of RUL prediction for the lithium-ion batteries.Then,data-driven methods used for lithium-ion battery RUL estimation are summarized,in which several statistical and machine learning algorithms are involved.Finally,the future trend for battery prognostics and RUL estimation are forecasted. | LIU Datong ZHOU Jianbao PENG Yu | 2014 | Instrumentation2014，1，1： | 5 |
| 5 | ABOUT THE BASIC INTEGRAL VARIANTS OF HOLONOMIC NONCONSERVATIVE DYNAMICAL SYSTEMS显示文摘In this paper,we prove that for holonomic nonconservative dynamical system the Poincareand Poincaré-Cartan integral invariants do not exist.Instead of them,we introduce the integral variants ofPoincaré Cartan’s type and of Poincaré’s type for holonomie noneonservative dynamical systems,and usethese variants to solve the problem of nonlinear vibration.We also prove that the integral invariants intro-duced in references[1]and[2]are merely the basic integral variants given by this paper. | Liu Duan Luo Yong (Beijing Institute of Technology)Xin Shenyu (P.O.Box 22,Datong,Shanxi) | 1991 | Acta Mechanica Sinica1991，7，2： | 3 |
| 6 | Experimental study on the noise reduction of an industrial forward-curved blades centrifugal fan显示文摘 | Qi Datong Mao Yijun Liu Xiaoliang Yuan Minjian | 2009 | Applied Acoustics2009，，8： | 2 |
| 7 | Precise inspection of worm tooth profile based on coordinate measurements显示文摘 | Liu Fenglin Qin Datong Deng Xingyi | 2007 | Journal of Chongqing University:Natural Science Edi- tion2007，30，11： | 1 |
| 8 | Numerical calculation of centrifugal fan noise显示文摘 | Liu Qiuhong Qi Datong Mao Yijun | | 0，，： | 1 |
| 9 | A systematic model for dynamics and control of dual clutch transmissions显示文摘 | Liu Yonggang Qin Datong Jiang Hong | 2009 | Journal of Mechanical Design2009，31，7： | 1 |
| 10 | A review of water flooding issues in the proton exchange membrane fuel cell显示文摘 | Hui Li Yanghua Tang Zhenwei Wang Zheng Shi Shaohong Wu Datong Song Jianlu Zhang Khalid Fatih Jiujun Zhang Haijiang Wang Zhongsheng Liu Rami Abouatallah Antonio Mazza | 2007 | Journal of Power Sources2007，，1： | 1 |
| 11 | LPS Induced miR-181a Promotes Pancreatic Cancer Cell Migration via Targeting PTEN and MAP2K4显示文摘 | Jianhui Liu Dong Xu Qingguang Wang Datong Zheng Xiuqin Jiang Lijian Xu | 2014 | Digestive Diseases and Sciences2014，，7： | 1 |
| 12 | A Control Strategy on Starting up a Vehicle with AMT显示文摘 | Amir I A Qin Datong Liu Zhenjun | 2005 | In- formation Technology Journal2005，4，2： | 1 |
| 13 | Numerical calculation of centrifugal fan noise 显示文摘 | LIU Qiuhong QI Datong MAO Yijun | 2006 | Proceedings of Institution of Mechanical Engineers: Part C Journal of Mechanical Engineering Science2006，220，8： | 1 |
| 14 | Computation of aerodynamic noise of centrifugal fan using LES approach,acoustic analogy and vortex sound theory显示文摘 | LIU Qiuhong QI Datong TAN Hongtao | 2007 | Journal of Mechanical Engineering Science2007，221，11： | 1 |
| 15 | Computation of aerodynamic noise of centrifugal fan using large eddy simulation approach, acoustic analogy, and vortex sound theory 显示文摘 | LIU Qiuhong QI Datong TANG Hongtao | 2007 | Proceedings of Institution of Mechanical Engineers: Part C Journal of Mechanical Engineering Science2007，221，11： | 1 |
| 16 | Numerical prediction of aerodynamic tonal noise radiated from a centrifugal fan显示文摘 | MAO Yijun QI Datong LIU Xiaoliang | 2008 | Proceedings of Institution of Mechanical Engineers: Part A Journal of Power and Energy2008，222，8： | 1 |
| 17 | Shiftschedule optimization for Dual Clutch Transmissions显示文摘 | Mac Yonggang Liu Datong Qin Yi Zhang | 2009 | Mechanism and Machine Theory2009，42，： | 1 |
| 18 | A Systematic Model for Dynamics and Control of Dual Clutch Transmissions 显示文摘 | Liu Yonggang Qin Datong Jiang Hong | 2009 | Journal of Mechanical Design2009，31，7： | 1 |
| 19 | A control strategy on starting up of vehicle with automatic manual transmis- sions 显示文摘 | AMIR I A QIN Datong LIU Zhenjun | 2005 | Information Technology Journal2005，4，2： | 1 |
| 20 | Numerical calculation of centrifugal fan noise 显示文摘 | Liu Qiuhong Qi Datong Mao Yijun | 2006 | Proceedings of the Institution of Mechanical Engineers Part C-Journal of Mechanical Engineering Science2006，220，8： | 1 |
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