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Bed inventory balance and stability of dual circulating fluidized bed systems

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Particuology 2024年第1期84卷 98-106页

作者： Yangjun Wei Leming cheng David Pallares Bo Leckner Institute for Thermal Power Engineering State Key Laboratory of Clean Energy UtilizationZhejiang UniversityHangzhou310027China Department of space Earth and EnvironmentChalmers University of TechnologyS-41296GöteborgSweden

Experiments and modelling are conducted for general understanding on the imbalance phenomenon and for discussion on the strategies to improve the bed inventory balance and stability of a dual circulating fluidized bed(DCFB)*** experiments are carried out in a 15.5 m high pilot-scale DCFB cold test system.A fluid-dynamic DCFB model is developed based on a 1.5-dimensional semi-empirical model of an industrial CFB boiler,validated by experimental *** effects of control methods and operation conditions on the bed inventory balance and on the stability of the pilot-and large-scale DCFB systems are discussed.A"stable-unbalanced"state,where the system reaches a steady state,consisting of un-balanced bed inventories,is observed in both experiments and model *** maintain a balanced state and similar bed inventory in the DCFB systems with similar cross-sectional areas,it is recom-mended to keep similar total pressure drops or gas velocities in both reactors.

关键词： Bed inventory balance stability Dual circulating fluidized bed(DCFB) Experiment Modelling

Reliability of a Multicomponent stress-strength Model Based on a Bivariate kumaraswamy Distribution with Censored Data

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Acta Mathematicae Applicatae sinica 2024年第2期40卷 478-507页

作者： Cong-hua cheng school of Mathematics and statistics Zhaoqing UniversityZhaoqing 526061China

In this paper,we consider a system which has k.s.atistically independent and identically distributed strength components and each component is constructed by a pair of statistically dependent elements with doubly type-II censored *** elements(X1,Y1),(X2,Y2),…,(Xk,Yk)follow a bivariate kumaraswamy distribution and each element is exposed to a common random stress T which follows a kumaraswamy *** system is regarded as operating only if at least s out of k(1≤s≤k.s.rength variables exceed the random *** multicomponent reliability of the system is given by Rs,k=P(at least s of the(Z1,…,Zk)exceed T)where Zi=min(Xi,Yi),i=1,…,*** Bayes estimates of Rs,k have been developed by using the Markov Chain Monte Carlo methods due to the lack of explicit *** uniformly minimum variance unbiased and exact Bayes estimates of Rs,k are obtained analytically when the common second shape parameter is *** asymptotic confidence interval and the highest probability density credible interval are constructed for Rs,*** reliability estimators are compared by using the estimated risks through Monte Carlo simulations.

关键词： stress-strength model bivariate kumaraswamy distribution multicomponent reliability doubly Type-II censored scheme interval estimation

Equalizer Zero-Determinant strategy in Discounted Repeated stackelberg Asymmetric Game

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Journal of systems science & Complexity 2024年第1期37卷 184-203页

作者： cheng Zhaoyang CHEN Guanpu HONG Yiguang key Laboratory of systems and Control Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China school of Mathematical sciences University of Chinese Academy of SciencesBeijing 100049China school of Electrical Engineering and Computer science KTH Royal Institute of Technology10044 StockholmSweden. Department of Control science and Engineering Tongji UniversityShanghai 201804China shanghai Research Institute for Intelligent Autonomous systems Tongji UniversityShanghai 210201China

This paper focuses on the performance of equalizer zero-determinant(ZD)strategies in discounted repeated stackelberg asymmetric *** the leader-follower adversarial scenario,the strong stackelberg equilibrium(ssE)deriving from the opponents’best response(BR),is technically the optimal strategy for the ***,computing an ssE strategy may be difficult since it needs to solve a mixed-integer program and has exponential complexity in the number of *** this end,the authors propose an equalizer ZD strategy,which can unilaterally restrict the opponent’s expected *** authors first study the existence of an equalizer ZD strategy with one-to-one situations,and analyze an upper bound of its performance with the baseline ssE *** the authors turn to multi-player models,where there exists one player adopting an equalizer ZD *** authors give bounds of the weighted sum of opponents’s utilities,and compare it with the ssE ***,the authors give simulations on unmanned aerial vehicles(UAVs)and the moving target defense(MTD)to verify the effectiveness of the proposed approach.

关键词： Discounted repeated stackelberg asymmetric game equalizer zero-determinant strategy strong stackelberg equilibrium strategy

Nutrient transport following water transfer through the world's largest water diversion channel

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Journal of Environmental sciences 2024年第1期135卷 703-714页

作者： Yuanhui cheng Hong Zhang Wei Yin state key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085 China Changjiang Water Resources Protection Institute Wuhan 430051China University of Chinese Academy of sciences Beijing 100049China

Nutrient levels in the artificial channel constructed for the Middle Route Project are significant indicators of water quality safety and aquatic ecological integrity for this large,interbasin ***,the distribution and transport of nutrients along the channel were poorly *** on a time-series dataset as well as mass balance and material flow analysis methods,the water and nutrient transport fluxes in the Middle Route of the south-to-North Water Diversion Project were identified in this *** results indicate that the nutrient concentrations varied considerably with time,but there was no significant difference among the 30 stations of the main *** temperature difference was the major factor in the large fluctuations of water quality indicators over *** nutrient loadings varied with the water volume outputs from the main channel to the waterreceiving *** deposition was an important source of nutrients in the main channel,accounting for 9.13%,20.6%,and 0.635%of the nitrogen,phosphorus,and sulfur input from the Danjiangkou Reservoir,*** 2021,a net accumulation of 988 tons of N,29 tons of P,and 2,540 tons of s,respectively,were present in the main *** increase of these external and internal nutrient loadings would cause water quality fluctuation and deterioration in some local sections of the main *** study quantified the spatial and temporal patterns of nutrient transport in the Middle Route and revealed the ecological effects on the aquatic environment,assisting authorities on the project to develop effective water conservation strategies.

关键词： Nutrient transport spatiotemporal patterns The Middle Route The south-to-North Diversion Project Hydro-ecological effects Water-receiving cities

Enhancing performance and longevity of solid-state zinc-iodine batteries with fluorine-rich solid electrolyte interphase

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Materials Futures 2024年第3期3卷 121-131页

作者： Yongxin Huang Yiqing Wang Xiyue Peng Tongen Lin Xia Huang Norah s Alghamdi Masud Rana Peng Chen cheng Zhang Andrew k Whittaker Lianzhou Wang and Bin Luo Australian Institute for Bioengineering and Nanotechnology(AIBN) The University of QueenslandBrisbaneQLD4072Australia school of Chemical Engineering The University of QueenslandBrisbaneQLD4072Australia school of Chemistry and Molecular Biosciences Faculty of ScienceThe University of QueenslandBrisbaneQLD4072Australia Department of Chemistry Faculty of ScienceImam Mohammad Ibn Saud Islamic University(IMSIU)Riyadh 11564Saudi Arabia

Rechargeable zinc-iodine(ZnI_(2))batteries have gained popularity within the realm of aqueous batteries due to their inherent advantages,including natural abundance,intrinsic safety,and high theoretical ***,challenges persist in their practical applications,notably battery swelling and vulnerability in aqueous electrolytes,primarily linked to the hydrogen evolution reaction and zinc dendrite *** address these challenges,this study presents an innovative approach by designing a solid-state ZnI_(2)battery featuring a solid perfluoropolyether based polymer *** results demonstrate the formation of a solid electrolyte interphase layer on zinc,promoting horizontal zinc growth,mitigating dendrite penetration,and enhancing battery cycle ***,the solid electrolyte hinders the iodine ion shuttle effect,reducing zinc foil *** batteries employing this electrolyte demonstrate excellent cycle performance,maintaining stability for approximately 5000 h at room temperature,while solid-state ZnI_(2)batteries exhibit over 7000 cycles with a capacity retention exceeding 72.2%.This work offers a promising pathway to achieving reliable energy storage in solid-state ZnI_(2)batteries and introduces innovative concepts for flexible and wearable zinc batteries.

关键词： zinc-iodine battery solid electrolyte zinc metal anode electrolyte interphase shuttle effect

Prediction and Output Estimation of Pattern Moving in Non-Newtonian Mechanical systems Based on Probability Density Evolution

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Computer Modeling in Engineering & sciences 2024年第4期139卷 515-536页

作者： cheng Han Zhengguang Xu school of Automation and Electrical Engineering University of Science and Technology BeijingBeijing100083China key Laboratory of knowledge Automation for Industrial Processes University of Science and Technology BeijingBeijing100083China

A prediction framework based on the evolution of pattern motion probability density is proposed for the output prediction and estimation problem of non-Newtonian mechanical systems,assuming that the system satisfies the generalized Lipschitz *** a complex nonlinear system primarily governed by statistical laws rather than Newtonian mechanics,the output of non-Newtonian mechanics systems is difficult to describe through deterministic variables such as state variables,which poses difficulties in predicting and estimating the system’s *** this article,the temporal variation of the system is described by constructing pattern category variables,which are non-deterministic *** pattern category variables have statistical attributes but not operational attributes,operational attributes are assigned to them by posterior probability density,and a method for analyzing their motion laws using probability density evolution is ***,a data-driven form of pattern motion probabilistic density evolution prediction method is designed by combining pseudo partial derivative(PPD),achieving prediction of the probability density satisfying the system’s output *** on this,the final prediction estimation of the system’s output value is realized by minimum variance unbiased ***,a corresponding PPD estimation algorithm is designed using an extended state observer(EsO)to estimate the parameters to be estimated in the proposed prediction *** effectiveness of the parameter estimation algorithm and prediction method is demonstrated through theoretical analysis,and the accuracy of the algorithm is verified by two numerical simulation examples.

关键词： Non-newtonian mechanical systems prediction and estimation pattern moving probability density evolution pseudo partial derivative

Market Equilibrium Based on Cloud-edge Collaboration

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CsEE Journal of Power and Energy systems 2024年第1期10卷 96-104页

作者： Tong cheng Haiwang Zhong Qing Xia the state key Laboratory of Power systems the Department of Electrical EngineeringTsinghua UniversityBeijing 100084China

Market participants can only bid with lagged information disclosure under the existing market mechanism,which can lead to information asymmetry and irrational market behavior,thus influencing market *** promote rational bidding behavior of market participants and improve market efficiency,a novel electricity market mechanism based on cloudedge collaboration is proposed in this *** market information,called residual demand curve,is published to market participants in real-time on the cloud side,while participants on the edge side are allowed to adjust their bids according to the information disclosure prior to closure *** proposed mechanism can encourage rational bids in an incentive-compatible way through the process of dynamic equilibrium while protecting participants’*** paper further formulates the mathematical model of market equilibrium to simulate the process of each market participant’s strategic bidding behavior towards equilibrium.A case study based on the IEEE 30-bus system shows the proposed market mechanism can effectively guide bidding behavior of market participants,while condensing exchanged information and protecting privacy of participants.

关键词： Cloud-edge collaboration market mechanism residual demand curve strategic bidding

Machine learning and numerical investigation on drag coefficient of arbitrary polygonal particles

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International Journal of Mechanical system Dynamics 2024年第3期4卷 317-330页

作者： Haonan Xiang cheng cheng Pei Zhang Genghui Jiang school of Energy and Power Engineering Nanjing University of Science and TechnologyNanjingChina school of Engineering Westlake UniversityHangzhouChina

The drag coefficient,as the most important parameter that characterizes particle dynamics in flows,has been the focus of a large number of *** good predictability is achieved for simple shapes,it is still challenging to accurately predict drag coefficient of complex-shaped particles even under moderate Reynolds number(Re).The problem is that the small-scale shape details of particles can still have considerable impact on the drag coefficient,but these geometrical details cannot be described by single shape *** address this challenge,we leverage modern deep-learning method's ability for pattern recognition,take multiple shape factors as input to better characterize particle-shape details,and use the drag coefficient as *** obtain a high-precision data set,the discrete element method coupled with an improved velocity interpolation scheme of the lattice Boltzmann method is used to simulate and analyze the sedimentation dynamics of polygonal *** different machine-learning models for predicting the drag coefficient are developed and *** results show that our model can well predict the drag coefficient with an average error of less than 5%for *** findings suggest that data-driven models can be an attractive option for the drag-coefficient prediction for particles with complex shapes.

关键词： drag coefficient arbitrary polygonal particle shape factor DEM–LBM machine Learning

Model-driven path planning for robotic plasma cutting of branch pipe with single Y-groove based on pipe-rotating scheme

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Advances in Manufacturing 2024年第1期12卷 94-107页

作者： Yan Liu Qiu Tang Xin-cheng Tian school of Control science and Engineering Shandong UniversityJinan250061People’s Republic of China Engineering Research Center of Intelligent Unmanned system Ministry of EducationJinan250061People’s Republic of China school of Mechanical and Electronic Engineering Shandong Jianzhu UniversityJinan250101People’s Republic of China

The automatic cutting of intersecting pipes is a challenging task in *** improved automation and accuracy,this paper proposes a model-driven path planning approach for the robotic plasma cutting of a branch pipe with a single ***,it summarizes the intersection forms and introduces a dual-pipe intersection *** on this model,the moving three-plane structure(a description unit of the geometric characteristics of the intersecting curve)is constructed,and a geometric model of the branch pipe with a single Y-groove is ***,a novel mathematical model for plasma radius and taper compensation is ***,the compensation model and groove model are integrated by establishing movable ***,to prevent collisions between the plasma torch and workpiece,the torch height is planned and a branch pipe-rotating scheme is *** the established models and moving frames,the planned path description of cutting robot is provided in this novel *** accuracy of the proposed method is verified by simulations and robotic cutting experiments.

关键词： Automatic groove cutting of intersecting pipes Model-driven robot path planning Plasma beam radius and taper compensation