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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 | Power-balancing Instantaneous Optimization Energy Management for a Novel Series-parallel Hybrid Electric Bus显示文摘Energy management(EM) is a core technique of hybrid electric bus(HEB) in order to advance fuel economy performance optimization and is unique for the corresponding configuration. There are existing algorithms of control strategy seldom take battery power management into account with international combustion engine power management. In this paper, a type of power-balancing instantaneous optimization(PBIO) energy management control strategy is proposed for a novel series-parallel hybrid electric bus. According to the characteristic of the novel series-parallel architecture, the switching boundary condition between series and parallel mode as well as the control rules of the power-balancing strategy are developed. The equivalent fuel model of battery is implemented and combined with the fuel of engine to constitute the objective function which is to minimize the fuel consumption at each sampled time and to coordinate the power distribution in real-time between the engine and battery. To validate the proposed strategy effective and reasonable, a forward model is built based on Matlab/Simulink for the simulation and the dSPACE autobox is applied to act as a controller for hardware in-the-loop integrated with bench test. Both the results of simulation and hardware-in-the-loop demonstrate that the proposed strategy not only enable to sustain the battery SOC within its operational range and keep the engine operation point locating the peak efficiency region, but also the fuel economy of series-parallel hybrid electric bus(SPHEB) dramatically advanced up to 30.73% via comparing with the prototype bus and a similar improvement for PBIO strategy relative to rule-based strategy, the reduction of fuel consumption is up to 12.38%. The proposed research ensures the algorithm of PBIO is real-time applicability, improves the efficiency of SPHEB system, as well as suite to complicated configuration perfectly. | SUN Dongye LIN Xinyou QIN Datong DENG Tao | 2012 | Chinese Journal of Mechanical Engineering2012，25，6： | 18 |
| 3 | 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 |
| 4 | DIRECT DIGITAL DESIGN AND SIMULATION OF MESHING IN WORM-GEAR DRIVE显示文摘蠕虫齿轮开车的一个直接数字的设计方法(DDDM ) 被建议。它是直接基于生产的模拟处理并且与常规建模方法完全不同。装载牙齿接触分析(LTCA ) 方法被分析,在哪个出现寻找技术的先进表面被包括。接触地区和传动错误(TE ) 上的 misalignmenterrors 和接触变丑的影响被讨论。蠕虫牙齿表面的 Combinedmodification 途径被介绍。借助于 DDDM 和 LTCA,验证蠕虫齿轮开车的效果是很方便的“ s 修正途径。分析结果显示出那,在侧面方向的修正在纵的方向减少减少蠕虫齿轮开车 tomisalignment 错误和修正的敏感 TE。因此,蠕虫齿轮开车的优化设计能在实际生产过程以前被完成。 | XU Wujiao QIN Datong SHI Wankai | 2006 | Chinese Journal of Mechanical Engineering2006，19，3： | 10 |
| 5 | 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 |
| 6 | Research progress on squeeze casting in China显示文摘Squeeze casting is a technology with short route,high efficiency and precise forming,possessing features of casting and plastic processing.It is widely used to produce high performance metallic structural parts.As energy conservation and environmental protection concerns have risen,lightweight and high performance metal parts are urgently needed,which accelerated the development of squeeze casting technology over the past two decades in China.In this paper,research progress on squeeze casting alloys,typical parts manufacturing and development of squeeze casting equipment in China are introduced.The future trend and development priorities of squeeze casting are discussed. | Li Yuanyuan Zhang Weiwen Zhao Haidong You Dongdong Zhang Datong Shao Ming Zhang Wen | 2014 | China Foundry2014，11，4： | 8 |
| 7 | An integrated turbocharger design approach to improve engine performance显示文摘Turbocharging technology is today considered as a promising way for internal combustion engine energy saving and CO2 reduction.Turbocharger design is a major challenge for turbocharged engine performance improvement.The turbocharger designer must draw upon the information of engine operation conditions,and an appropriate link between the engine requirements and design features must be carefully developed to generate the most suitable design recommendation.The objective of this research is to develop a turbocharger design approach for better turbocharger matching to an internal combustion engine.The development of the approach is based on the concept of turbocharger design and interaction links between engine cycle requirements and design parameter values.A turbocharger through flow model is then used to generate the design alternatives.This integrated method has been applied with success to a gasoline engine turbocharger assembly. | ZHANG YangJun1,CHEN Tao1,ZHUGE WeiLin1,ZHANG ShuYong2 & XU JianZhong3 1 State Key Laboratory of Automotive Safety and Energy,Tsinghua University,Beijing 100084,China 2 National Key Laboratory of Diesel Engine Turbocharging Technology,P.O.B.22,Datong 037036,China 3 Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China | 2010 | Science China(Technological Sciences)2010，53，1： | 8 |
| 8 | Microstructures and tensile properties of submerged friction stir processed AZ91 magnesium alloy显示文摘6 mm thick AZ91 casting alloy plates were subjected to normal friction stir processing(NFSP,in air)and submerged friction stir processing(SFSP,under water),and microstructures and tensile properties of the experimental materials were investigated.After FSP,the coarse microstructures in the as-cast condition are replaced by fine and equiaxed grains and the network-like eutecticβ-Mg_(17)Al_(12)phases disappear and are changed into particles pinned at the grain boundaries.SFSP results in further grain refinement in comparison with NFSP,and the average grain sizes of the NFSP and SFSP alloys are 8.4±1.3 and 2.8±0.8µm,respectively.XRD results reveal that the intensity ofβ-Mg_(17)Al_(12)diffraction peaks in the SFSP specimen decreases compared with NFSP.Due to significant grain refinement,the tensile strength and elongation of the SFSP AZ91 alloy are increased from 262 MPa and 18.9%for the NFSP material to 282 MPa and 25.4%,and the tensile strength(282 MPa)is nearly three times that of the BM(105 MPa).SFSP is an effective approach to refine the grain size and enhance the tensile properties of AZ91 casting alloy. | Fang Chai Datong Zhang Yuanyuan Li | 2015 | Journal of Magnesium and Alloys2015，3，3： | 7 |
| 9 | Radiation spectrum of a high-dimensional rotating black hole显示文摘This study extends the classical Damour-Ruffini method and discusses Hawking radiation in a (n + 4)-dimensional rotating black hole. Under the condition that the total energy and angular momentum of spacetime are conservative, but angular momentum a = J/M of unit mass of the black hole is variable, taking into consideration the reaction of the radiation of the particle to the spacetime, a new Tortoise coordinate transformation and discuss the black hole radiation spectrum is discussed. The radiation spectrum that satisfies the unitary principle in the general case is derived. | ZHAO Ren, LI HuaiFan, ZHANG LiChun & WU YueQin Institute of Theoretical Physics, Shanxi Datong University Department of Physics, Shanxi Datong University, Datong 037009, China | 2010 | Science China(Physics,Mechanics & Astronomy)2010，53，3： | 6 |
| 10 | CONTROL STRATEGY OF A PARALLEL HYBRID CAR WITH A METAL BELT-PLANETARY GEAR CONTINUOUSLY VARIABLE TRANSMISSION SYSTEM显示文摘The most remarkable characteristic of a metal belt-planetary gear continuously variable transmission is a wider ratio range and a bigger torque capacity than a conventional metal pushing belt continuously variable transmission. A parallel hybrid car with this transmission system not only can reduce fuel consumption and pollutant emission at a ECE city cycle, but also can keep the motor working in the most efficiency area and can be started by a lower power motor by oneself. At the same time, the continuously variable transmission system can realize the smooth switch between the motor and the engine. | Sun Dongye Qin Datong Wang HongyanState Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China | 2002 | Chinese Journal of Mechanical Engineering2002，15，3： | 5 |
| 11 | RESEARCH ON DESIGN METHOD OF A MULTIPLE DISC WET BRAKE IN LUBRICATED ENVIRONMENT显示文摘The rmomechanical phenomena occurring between friction pairs greatly change the distributions of lining pressure and friction surface temperature of a multiple disc wet brake. It has become one of the main causes of brake failure. In order to understand these thermomechanical phenomena, several design and mate
rial factors that have great influence on thermomechanical phenomena, such as heat transfer coefficient, friction factor, sliding velocity, initial lining pressure and so on, are analyzed. An isothermal design method is proposed for designing a multiple disc wet brake. | Qin Datong Sun DongyeState Key Laboratory ofMechanical Transmission,Chongqing University,Chongqing 400044, China | 2003 | Chinese Journal of Mechanical Engineering2003，16，4： | 5 |
| 12 | Effect of microstructure on the mechanical and corrosion behaviors of a hot-extruded nickel aluminum bronze显示文摘In this paper,the influence of microstructure on the corrosion behavior of a hotextruded nickel aluminum bronze was studied.Three kinds of samples subjected to the hot-extrusion,annealing and quenching conditions were prepared and immersion tests in 3.5% NaCl solution were carried out.Microstructures and corrosion surface morphologies of the samples were observed by SEM.It was found that the retained β martensite and(α+κⅢ) lamella eutectoid in the as hot-extruded material were eliminated after annealing,and corrosion resistance of the alloy was improved.As to the as-quenched material,its corrosion rate was higher than that of the as hotextruded material since the volume fraction of β phase which was anodic to α phase increased after quenching.As regards the mechanical properties,the as-quenched sample possesses the highest hardness and tensile strength among the three kinds of samples,while the as-annealed sample possesses the highest elongation.That is to say,heat treatment plays different roles in the mechanical properties and corrosion resistance of the experimental alloy. | Datong ZHANG Ruiping CHEN Weiwen ZHANG Zongqiang LUO Yuanyuan LI | 2010 | Acta Metallurgica Sinica(English Letters)2010，23，2： | 5 |
| 13 | Tests for nonparametric parts on partially linear single index models显示文摘Tests for nonparametric parts on partially linear single index models are considered in this paper. Based on the estimates obtained by the local linear method, the generalized likelihood ratio tests for the models are established. Under the null hypotheses the normalized tests follow asymptotically the χ2-distribution with the scale constants and the degrees of freedom being independent of the nuisance parameters, which is called the Wilks phenomenon. A simulated example is used to evaluate the performances of the testing procedures empirically. | Ri-quan ZHANG Department of Statistics, East China Normal University, Shanghai 200062, China Department of Mathematics, Shanxi Datong University, Datong 037009, China | 2007 | Science China Mathematics2007，50，3： | 5 |
| 14 | STUDY ON CONTROL STRATEGY OF CLUTCH STARTING FOR CAR WITH A METAL PUSHING BELT-PLANETARY GEAR CONTINUOUSLY VARIABLE TRANSMISSION SYSTEM显示文摘The automatic control of clutch startion in car with a metal pushing belt-planetary gear continuously variable transmission (CVT)is a complex problem.A suited control strategy is required to ralize quick and smooth start.A simulation state space equation is established on clutch startion control of a car startion process to weaken the jerk motion is introduced.The simulation results indicate that the jerk motion of clutch startiong is below 10m/s^3. | Sun Dongye Qin Datong Wang Hongyan State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044,China | 2002 | Chinese Journal of Mechanical Engineering2002，15，1： | 5 |
| 15 | 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 |
| 16 | Photochemical properties and source of pollutants during continuous pollution episodes in Beijing, October, 2011显示文摘Beijing sufered from serious air pollution in October, 2011 with the occurrence of three continuous episodes. Here we analyze the pollution status of particulate matter, the relationship between the gaseous pollutants, physical and chemical properties of single particles, and the profile of watersoluble ions in PM2.5during the three episodes. Regional and photochemically aged air masses, which were characterized as having high values of O3and SO2, were hypothesized to have played a dominant role in the first episode. After mixing local air masses with freshly-emitted primary pollutants, the concentration of NOx continued to increase and the size of SO4 2, NO3 and NH4 +in the particle population continued to become smaller. The amount of elemental carbon-rich and organic carbonrich particles in the scaled single particles(0.2–2 μm) and water-soluble K+in PM2.5also increased in the episodes. All the available information suggests that the biomass or fuel burning sources in or around Beijing may have had a huge impact on the last two episodes. | Jian Gao Yuechong Zhang Meng Zhang Jingqiao Zhang Shulan Wang Jun Tao Han Wang Datong Luo Fahe Chai Chun Ren | 2014 | Journal of Environmental Sciences2014，26，1： | 4 |
| 17 | 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 |
| 18 | Integrated Control Strategy for CVT Powertrains with Consideration of Vehicle Drivability显示文摘During shift,power flow is not interrupted in powertrains equipped with continuously variable transmission(CVT).When hard acceleration is commanded,engine speed will flare and corresponding torque will be consumed,which leads to a drop in vehicle drive torque and also the vehicle acceleration.This is the reason why CVT vehicles have poor drivability during hard acceleration maneuver.Conventional method such as torque compensation doesn't always work due to the limited backup torque of engine.According to this,means to evaluate the drivability of CVT vehicles are studied,affect factors of drivability are analyzed in detail.Hard acceleration process of CVT vehicle is studied by theoretical analysis,based on which engine torque and ratio change rate of CVT are identified as two key control parameters that decide the drivability of CVT vehicles during hard acceleration maneuver.Therefore,a control strategy based on restricting the change rate of CVT ratio together with torque compensation is proposed,and two different algorithms to establish the limitation of ratio change rate are proposed.These two algorithms are simulated and compared with each other,results indicate that drop of vehicle acceleration is eliminated evidently by limit the change rate of CVT ratio,but small ratio change rate also results in a longer time to finish the accelerate process,an algorithm to decide a proper ratio change rate is needed in order to tune these different characteristics.In order to get better control effects,a new fuzzy logic based algorithm is proposed to decide a proper ratio change rate during kick down conditions,simulation and experiment results indicate that,the amount of vehicle acceleration decrease is reduced from about 1 m/s2 to almost 0,in the mean time the accelerate process only delayed for about 0.3 s.The proposed control strategy and algorithm can effectively tune the characteristics of CVT equipped vehicle during kick down conditions. | SUN Dongye LUO Yong QIN Datong | 2012 | Chinese Journal of Mechanical Engineering2012，25，3： | 3 |
| 19 | OPTIMIZATION METHOD ON IMPELLER MERIDIONAL CONTOUR AND 3D BLADE显示文摘为 3D 片和南方的轮廓的一个优化方法离心或混合流动 impeller 基于 3D 粘滞计算液体动力学(CFD ) 分析被建议。片是间接地用尖动量的 parameterized 并且由反的设计方法计算。设计变量被分开成二个范畴:南方的轮廓设计变量和片设计变量。第一,仅仅片与南方的轮廓用基因算法被优化仍然是的常数。有根据实验理论的设计策划的训练样品数据的人工的神经网络(ANN ) 技术被采用构造在片设计变量和 impeller 性能之间的反应关系。然后,基于 ANN 接近了在南方的轮廓设计变量和 impeller 性能之间的关系,南方的轮廓被优化。更少设计变量和更少计算努力在这个方法被要求可以广泛地在三尺寸的 impellers 的优化被使用。在头和效率被 12.9% 和 4.5% 分别地提高的地方,在混合流动泵的优化 impeller 证实这个最新建议的方法的有效性。 | LU Jinling XI Guang QI Datong | 2007 | Chinese Journal of Mechanical Engineering2007，20，6： | 3 |
| 20 | EXISTENCE OF TRIPLE POSITIVE SOLUTIONS TO BOUNDARY VALUE PROBLEM OF NONLINEAR FRACTIONAL DIFFERENTIAL EQUATION DEPENDING ON A PARAMETER显示文摘In this paper,we establish the existence of three positive solutions to a nonlinear fractional differential equation by the Leggett-Williams fixed point theorem. | Shugui Kang 1,Yan Li 2,Jianmin Guo 1 1.Applied of Math.Institute,Shanxi Datong University,Datong 037009,Shanxi 2.Dept.of Math.,Shanxi Normal University,Linfen 041000,Shanxi | 2012 | Annals of Differential Equations2012，28，4： | 2 |
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