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电动拖拉机复合式振动馈能系统设计及试验

农机化研究 2025年第4期47卷 230-235页

作者：王旭东王琪王威陈雨崔永杰西北农林科技大学机械与电子工程学院陕西杨凌712100 陕西省农业信息感知与智能服务重点实验室陕西杨凌712100 农业农村部农业物联网重点实验室陕西杨凌712100

为了回收和利用电动拖拉机行驶过程中产生的振动能量,基于浮动电池组提出了一种压电-机械电磁复合式振动馈能装置;然后,根据装置的电压输出特性构建了包含整流滤波、LM317稳压、超级电容储能和Boost升压模块的电能提取电路,以满足蓄电... 详细信息

为了回收和利用电动拖拉机行驶过程中产生的振动能量,基于浮动电池组提出了一种压电-机械电磁复合式振动馈能装置;然后,根据装置的电压输出特性构建了包含整流滤波、LM317稳压、超级电容储能和Boost升压模块的电能提取电路,以满足蓄电池充电需求;最后,进行了复合式振动馈能系统的实车试验。结果表明:电动拖拉机车速为4 km/h时,馈能装置的最大输出电压为34.80 V,平均输出功率为0.57 W;经过等效计算,由复合式馈能系统回收的电能可使电动拖拉机的续航时间延长0.784 7 h。研究结果可为我国电动拖拉机的电能补给和工作时间延长提供理论与技术支撑。

关键词：电动拖拉机振动能量回收复合式振动馈能装置电能提取电路

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Multi-Source Spinal Coding for Coded Caching Multicast Transmissions in Wireless Networks

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China Communications 2021年第3期18卷 91-104页

作者： Aimin Tang xudong wang University of Michigan-Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong UniversityShanghai 200240China

Recently,coded caching has been treated as a promising technique to alleviate the traffic burden in wireless *** support high efficient coded caching multicast transmissions,the time-varying heterogeneous channel conditions need to be *** this paper,a practical and novel multi-source spinal coding(MSSC)scheme is developed for coded caching multicast transmissions under heterogeneous channel *** exploring joint design of network coding and spinal coding(SC),MSSC can achieve unequal link rates in multicast transmissions for different ***,by leveraging the rateless feature of SC in our design,MSSC can well adapt the link rates of all users in multicast transmissions without any feedback of time-varying channel conditions.A maximum likelihood(ML)based decoding process for MSSC is also developed,which can achieve a linear complexity with respect to the user number in the multicast *** results validate the effectiveness of the MSSC *** to the existing scheme,the sum rate of MSSC in multicast transmissions is improved by about 20%.When applying MSSC in coded caching systems,the total transmission time can be reduced by up to 48% for time-varying channels.

关键词： coded caching spinal code network coding multicast transmission wireless networks

Low friction in self-mated silicon carbide tribosystem using nanodiamond as lubricating additive in water

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Friction 2021年第3期9卷 598-611页

作者： xudong wang Hirotsuna SATO Koshi ADACHI UniversitéParis-Saclay UVSQLISVVélizy-Villacoublay 78124France Department of Mechanical Systems Engineering Graduate School of EngineeringTohoku University6-6-01Aramaki-azaAobaAoba-kuSendai 980-8579Japan Hino Motors Ltd.3-1-1Hino-daiHino-shiTokyo 191-8660Japan

Nanodiamond particles(NDPs)have been considered as a potential lubricant additive to various tribological applications,such as water lubrication *** this study,the tribological properties of silicon carbide(SiC)lubricated by NDPs dispersed in water are investigated utilizing the ball-on-disk *** is found that the slight addition of NDP to water(i.e.,0.001 wt%)can distinctly accelerate the running-in process,which is necessary to achieve a friction coefficient(μ)as low as *** study also discusses two NDP functional terminations—hydroxyl and *** is demonstrated that the use of carboxyl-terminated NDP over a wide range of concentration(0.001 wt%-1 wt%)yields a low friction *** contrast,the ideal effective concentration of hydroxyl-terminated NDP is considerably limited because agglomeration in this material is more probable to occur than in the ***,when utilizing NDPs,the input friction energy(P_(in),defined as the product of sliding speed and applied load)is found to have an essential *** sliding tests were implemented at various P_(in) values(50-1,500 mW)using carboxyl-terminated water-dispersed *** was observed that theμand wear decreased with increasing P_(in) when 200 mW

关键词： nanodiamond particle silicon carbide(SiC) lubrication termination groups running-in driving energy

Island partition of the distribution system with distributed generation

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Science China(Technological Sciences) 2010年第11期53卷 3061-3071页

作者： wang xudong LIN JiKeng Key laboratory of Power System Simulation and Control of Ministry of Education Tianjin UniversityTianjin 300072China

In this paper, a novel optimum island partition model based on Tree Knapsack Problem (TKP) is presented for the distribution system integrated with distributed generation (DG), and a Depth-first Dynamic Programming Algorithm (DPA) is used to solve this model. With the considerations of the load priority, controlled/uncontrolled loads, and the constraints of power balance, voltage and equipment capacity, the model can meet the practical engineering requirements very well. The island partition problem of the distribution system integrated with multiple DGs is first decomposed into multiple TKPs, each of which is solved by DPA respectively. Then, the initial optimum island partition scheme is gained through an island combination procedure, and the final island partition scheme is obtained after feasibility checking and adjustment. Since the algorithm proposed owns the advantages of strong theoretical foundation and low computational complexity, it can find the approximate optimal solution within a limited time. The results of examples demonstrate the validity of the new model and algorithm.

关键词： optimum island partition distribution system distribution generation(DG) Tree Knapsack Problem(TKP) Depthfirst Dynamic Programming Algorithm(DPA)

Molybdenum based amorphous and nanocrystalline coatings prepared by high velocity oxy-fuel spraying

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Rare Metals 2012年第4期31卷 355-361页

作者： Fan, Zishuan Yu, Hongying wang, xudong Center for Corrosion and Protection University of Science and Technology BeijingBeijing 100083China

The high velocity oxy-fuel(HVOF) based thermal spray process has developed as a potential advantageous approach for fabricating various kinds of functional *** this article,the coatings of Mo-based alloy were synthesized using the HVOF *** microstructure and the mechanical properties of the HVOF-processed coatings were investigated using SEM,TEM,XRD,and hardness and wear *** treatment was applied to the as-sprayed coatings to develop the microstructure and its effect on the microstructure and mechanical properties of the coatings was *** is found that the HVOF-processed Mo-based alloy coatings are comprised of an amorphous splat matrix embedded with nano-sized crystalline *** at temperatures over 950 ℃ results into crystallization of the amorphous *** mechanical properties of the as-sprayed coatings are enhanced with annealing temperature up to 750 ℃ and from 950 to 1050 ℃,keeps constant between 750 and 950 ℃,and reduce over 1050 ℃.The change of the mechanical property with the microstructure was illustrated in the study.

关键词： molybdenum based alloy coating amorphous and nanocrystalline phases hardness and tribology anealling high velocity oxy-fuel spraying

The stochastic sliding mode variable structure guidance laws based on optimal control theory

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控制理论与应用（英文版） 2013年第1期11卷 86-91页

作者： Hongqiang wang Daiqiang CAO xudong wang PLA 95997 Unit Engineering College Air Force Engineering University

A stochastic sliding-mode variable structure guidance law involving optimal control theory is presented for the missile target intercept model, in which state noise, uncertain system parameters, target movement and measured noise are considered. This guidance law synthesizes the merits of optimal guidance law with line-of-sight rate convergence and sliding-mode guidance law with strong robustness. Through theoretic analysis, it is proved that the sliding mode hyperplane is sub-achievable in the closed loop system. The numerical results show the effectiveness of the proposed control algorithm.

关键词： Stochastic system Variable structure control Optimal control Guidance law Robust

DISCONTINUOUS GALERKIN METHODS AND THEIR ADAPTIVITY FOR THE TEMPERED FRACTION AL(CONVECTION)DIFFUSION EQUATIONS

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Journal of Computational Mathematics 2020年第6期38卷 839-867页

作者： xudong wang Weihua Deng School of Mathematics and Statistics Gansu Key Laboratory of Applied Mathematics and Complex SystemsLanzhou UniversityLanzhou 730000China

This paper focuses on the adaptive discontinuous Galerkin(DG)methods for the tempered fractional(convection)diffusion *** DG schemes with interior penalty for the diffusion term and numerical flux for the convection term are used to solve the equations,and the detailed stability and convergence analyses are *** on the derived posteriori error estimates,the local error indicator is *** theoretical results and the effectiveness of the adaptive DG methods are,respectively,verified and displayed by the extensive numerical *** strategy of designing adaptive schemes presented in this paper works for the general PDEs with fractional operators.

关键词： Adaptive DG methods Tempered fractional equations Posteriori error estimate

Thickness-Dependent Piezoelectric Property from Quasi-Two-Dimensional Zinc Oxide Nanosheets with Unit Cell Resolution

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Research 2021年第1期2021卷 1-7页

作者： Corey Carlos Yizhan wang Jingyu wang Jun Li xudong wang Department of Materials Science and Engineering University of Wisconsin–MadisonMadisonWisconsin 53706USA

A quantitative understanding of the nanoscale piezoelectric property will unlock many application potentials of the electromechanical coupling phenomenon under quantum *** this work,we present an atomic force microscopy-(AFM-)based approach to the quantification of the nanometer-scale piezoelectric property from single-crystalline zinc oxide nanosheets(NSs)with thicknesses ranging from 1 to 4 *** identifying the appropriate driving potential,we minimized the influences from electrostatic interactions and tip-sample coupling,and extrapolated the thickness-dependent piezoelectric coefficient(d_(33)).By averaging the measured d_(33) from NSs with the same number of unit cells in thickness,an intriguing tri-unit-cell relationship was *** NSs with 3n unit cell thickness(n=1,2,3),a bulk-like d_(33) at a value of~9 pm/V was obtained,whereas NSs with other thickness showed a~30%higher d_(33) of~12 pm/*** of d_(33) as a function of ZnO unit cell numbers offers a new experimental discovery toward nanoscale piezoelectricity from nonlayered materials that are piezoelectric in bulk.

关键词： piezoelectric coupling driving

Polymer-based Nanogenerator for Biomedical Applications

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Chemical Research in Chinese Universities 2020年第1期36卷 41-54页

作者： LI Jun LONG Yin wang xudong Department of Materials Science and Engineering University of Wisconsin-MadisonMadisonWisconsin 53706USA

Polymeric devices are the workhorses of modern *** one of the cutting-edge technology leveraging polymeric materials,nanogenerator that could convert micro-/nano-scale mechanical energy into electri-city based on the mechanism of piezoelectricity and triboelectricity exhibited great promise for biomedical applications,owning to the simple configuration,high efficiency,decent electrical output,biomimetic property as well as excellent *** this manuscript,the recent representative developments of NGs in biomedical applications are ***,such as working mechanisms underneath different NG prototypes are discussed,which is followed by innovative strategies endowing NG with biomimetic mechanical *** attempts to implement NG in specific biomedical fields(e.g.,power source for implantable medical devices,therapeutic electric stimulator,etc.)are introduced and *** manuscript ends up with subsection summarizing existed challenges while providing potential solutions for future NG developments in biomedical engineering.

关键词： Nanogenerator Polymeric material Biomedical application