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Thermal and mechanical behavior of casting copper alloy wheel during wheel and belt continuous casting process

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China Foundry 2024年第1期21卷 82-90页

作者： kun gao Yan Peng School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina

To investigate the thermal and mechanical behavior of casting wheel,a two-dimensional thermoelastic-plastic finite element model was used to predict the temperature,stress and distortion distribution of the casting wheel during the wheel and belt continuous casting process.The effects of grinding thickness and casting speed on the thermal and mechanical behaviors of the center of the hot face of the casting wheel were discussed in detail.In each rotation,the casting wheel passes through four different spray zones.The results show that the temperature distribution of the casting wheel in different spray zones is similar,the temperature of the hot face is the highest and the temperature reaches the peak in the spray zoneⅢ.The stress and distortion depend on the temperature distribution,and the maximum stress and distortion of the hot face are 358.2 MPa and 1.82 mm,respectively.The temperature at the center of the hot face decreases with increasing grinding thickness and increases with increasing casting speed.

关键词： casting wheel finite element model grinding thickness casting speed hot face spray zones

A Naturalistic Look into Maddy＇s Naturalistic Philosophy of Mathematics

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Frontiers of Philosophy in China 2016年第1期11卷 137-151页

作者： GAO Kun Department of Philosophy Peking University Beijing 100871 China

这份报纸讨论佩内洛普 Maddys (b。1950 ) 数学的自然哲学，它是在数学的哲学的 post-Quinean 自然主义的最有影响的形式之一。Maddys 理论的二个定义特征，也就是数学的方法学的自治和薄唯实论和 Arealism 的等价，被分析，并且他们的... 详细信息

这份报纸讨论佩内洛普 Maddys (b。1950 ) 数学的自然哲学，它是在数学的哲学的 post-Quinean 自然主义的最有影响的形式之一。Maddys 理论的二个定义特征，也就是数学的方法学的自治和薄唯实论和 Arealism 的等价，被分析，并且他们的一些批评自己从在思维的自然的线以内被提出。在这分析和批评期间，纸将也考虑 Maddys 异议到 Quinean 不可缺少争论，它是她自然主义的自己的版本的起点。

关键词：自然主义数学哲学自然哲学特征定义现实主义数学方法麦等价性

Artificial Intelligence in Omics

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Genomics, Proteomics & Bioinformatics 2022年第5期20卷 811-813页

作者： Feng gao kun Huang Yi Xing Department of Physics School of ScienceTianjin UniversityTianjin 300072China Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering(Ministry of Education) Tianjin UniversityTianjin 300072China Department of Biostatistics and Health Data Science Indiana University School of MedicineIndianapolisIN 46202USA IUPUI Fairbanks School of Public Health IndianapolisIN 46202USA Regenstrief Institute IndianapolisIN 46202USA Center for Computational and Genomic Medicine The Children’s Hospital of PhiladelphiaPhiladelphiaPA 19104USA Department of Biomedical and Health Informatics The Children’s Hospital of PhiladelphiaPhiladelphiaPA 19104USA Department of Pathology and Laboratory Medicine Perelman School of MedicineUniversity of PennsylvaniaPhiladelphiaPA 19104USA

Artificial intelligence(AI)is a powerful approach for solving complex problems in the processing,analysis,and interpretation of omics data,as well as the integration of multi-omics and clinical data.In recent years,AI has enabled remarkable breakthroughs across diverse biomedical fields,such as genomic variant interpretation,protein structure prediction,disease diagnosis,and drug discovery.Aiming to provide a forum for advances in the development and application of AI-based tools in omics,we have organized a special issue“Artificial Intelligence in Omics”for the journal Genomics,Proteomics&Bioinformatics(GPB).

关键词： diagnosis breakthrough journal

Merging control strategies of connected and autonomous vehicles at freeway on-ramps:a comprehensive review

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Journal of Intelligent and Connected Vehicles

Journal of Intelligent and Connected Vehicles 2022年第2期5卷 99-111页

作者： Jie Zhu Said Easa kun gao Department of Architecture and Civil Engineering Chalmers University of TechnologyGothenburgSweden Department of Civil Engineering Ryerson UniversityTorontoCanada

Purpose–On-ramp merging areas are typical bottlenecks in the freeway network since merging on-ramp vehicles may cause intensive disturbances on the mainline traffic flow and lead to various negative impacts on traffic efficiency and safety.The connected and autonomous vehicles(CAVs),with their capabilities of real-time communication and precise motion control,hold a great potential to facilitate ramp merging operation through enhanced coordination strategies.This paper aims to present a comprehensive review of the existing ramp merging strategies leveraging CAVs,focusing on the latest trends and developments in the research field.Design/methodology/approach–The review comprehensively covers 44 papers recently published in leading transportation journals.Based on the application context,control strategies are categorized into three categories:merging into sing-lane freeways with total CAVs,merging into singlane freeways with mixed traffic flows and merging into multilane freeways.Findings–Relevant literature is reviewed regarding the required technologies,control decision level,applied methods and impacts on traffic performance.More importantly,the authors identify the existing research gaps and provide insightful discussions on the potential and promising directions for future research based on the review,which facilitates further advancement in this research topic.Originality/value–Many strategies based on the communication and automation capabilities of CAVs have been developed over the past decades,devoted to facilitating the merging/lane-changing maneuvers at freeway on-ramps.Despite the significant progress made,an up-to-date review covering these latest developments is missing to the authors’best knowledge.This paper conducts a thorough review of the cooperation/coordination strategies that facilitate freeway on-ramp merging using CAVs,focusing on the latest developments in this field.Based on the review,the authors identify the existing research gaps in CAV ramp merging and discuss the potential and promis

关键词： Ramp merging Connected and autonomous vehicles Vehicle coordination Mixed traffic Multilane freeway

A bi-level optimization framework for charging station design problem considering heterogeneous charging modes

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Journal of Intelligent and Connected Vehicles

Journal of Intelligent and Connected Vehicles 2022年第1期5卷 8-16页

作者： Le Zhang Ziling Zeng kun gao School of Economics and Management Nanjing University of Science and TechnologyNanjingChina Department of Architecture and Civil Engineering Chalmers University of TechnologyGothenburgSweden

Purpose–The purpose of this paper is to optimize the design of charging station deployed at the terminal station for electric transit,with explicit consideration of heterogenous charging modes.Design/methodology/approach–The authors proposed a bi-level model to optimize the decision-making at both tactical and operational levels simultaneously.Specifically,at the operational level(i.***.lower level),the service schedule and recharging plan of electric buses are optimized under specific design of charging station.The objective of lower-level model is to minimize total daily operational cost.This model is solved by a tailored column generation-based heuristic algorithm.At the tactical level(i.***.upper level),the design of charging station is optimized based upon the results obtained at the lower level.A tabu search algorithm is proposed subsequently to solve the upper-level model.Findings–This study conducted numerical cases to validate the applicability of the proposed model.Some managerial insights stemmed from numerical case studies are revealed and discussed,which can help transit agencies design charging station scientifically.Originality/value–The joint consideration of heterogeneous charging modes in charging station would further lower the operational cost of electric transit and speed up the market penetration of battery electric buses.

关键词： Battery electric bus Charging station design Vehicle scheduling Bi-level model Heterogeneous charging modes

Sexual size monomorphism may evolve in lizards with a body size maximizing reproductive performance for both sexes

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Current Zoology 2023年第3期69卷 277-283页

作者： Hong-Liang Lu Jian-Fang gao kun Guo Xiang Ji Hangzhou Key Laboratory for Ecosystem Protection and Restoration School of Life and Environmental SciencesHangzhou Normal UniversityHangzhou 311121ZhejiangChina Zhejiang Provincial Key Laboratory for Water Environment and Marine Biological Resources Protection College of Life and Environmental SciencesWenzhou UniversityWenzhou 325035ZhejiangChina

We used Takydromus septentrionalis,a sexually size-monomorphic lacertid lizard,as a model system to test the hypothesis that sexual size monomorphism may evolve in lizards where reproductive performance is maximized at a similar body size for both sexes.We allowed lizards housed in laboratory enclosures to lay as many clutches(for females)as they could or to mate as many times(for males)as they could in a breeding season.Size-assortative mating was weak but evident in T.septentrionalis,as revealed by the fact that male and female snout–vent lengths(SVLs)in mating pairs were significantly and positively correlated.Mating frequency(indicative of male reproductive performance)varied from 1 to 8 per breeding season,generally increasing as SVL increased in adult males smaller than 67.4 mm SVL.Clutch frequency varied from 1 to 7 per breeding season,with female reproductive performance(determined by clutch frequency,annual fecundity,and annual reproductive output)maximized in females with a SVL of 68.0 mm.Accordingly to our hypothesis,the reproductive performance was maximized in the intermediate sized rather than the largest individuals in both sexes,and the body size maximizing reproductive performance was similar for both sexes.Future work could usefully investigate other lineages of lizards with sexually monomorphic species in a phylogenetic context to corroborate the hypothesis of this study.

关键词： annual fecundity annual reproductive output clutch frequency mating frequency Takydromus septentrionalis

Integration of nanoindentation and finite element method for interpretable tensile properties:A crossscale calculation method of uneven joints

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Chinese Journal of Aeronautics 2023年第6期36卷 233-248页

作者： kun gao Zhiying LIU Xiuli SHEN Lizhong LANG Shaojing DONG School of Energy and Power Engineering Beihang UniversityBeijing100191China Department of Materials Science and Engineering University of TorontoTorontoON M5S 3E4Canada

Nanoindentation testing and its Reverse Analysis Method(RAM)show great potential in understanding the tensile properties of metallic alloys with various microstructures.Nevertheless,the tensile properties of heterogeneous materials such as nickel-based superalloy welded joints have not been well interpreted by combining the microstructures and nanoindentation results,due to their diverse and complex microscopic zones,which throws shade on the properties of separated zones in the material.Here we demonstrated a new method of implanting nanoindentation results into Finite Element Method(FEM)and applied the method to the welded joints with the zones of various microstructure features.The local properties are calculated by the nanoindentation data using RAM,and used as input of Finite Element(FE)simulation of an identical indentation process,to in turn verify the accuracy and reliability of the reverse model.The simulation results reveal that the global mechanical behaviors,such as Young's modulus,yield strength and strain hardening exponent,are related to the local properties to a great extent.Thus,the global properties can be verified by simulation straight after experiments,taking consideration of local properties and dimension parameters of different zones.It is shown that the maximum error between calculation of RAM and testing is within 5.1%in different zones,and the errors of maximum indentation depth and residual depth obtained by FE simulation are less than 2.4%,which indicates that the method provides a reliable prediction of mechanical properties of superalloy welded joints.

关键词： Finite element method Nanoindentation Reverse analysis method Tensile properties Welded joints

Dynamic Response of the U-Typed Sandwich Panel Under Explosion Load Based on the SDOF Method

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China Ocean Engineering 2022年第5期36卷 814-826页

作者： LIU kun gao Yu ZHAO Chen-shui WANG Ze-ping School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China College of Shipbuilding Engineering Harbin Engineering UniversityHarbin 150001China Qingdao Innovation and Development Center of Harbin Engineering University Qingdao 266000China

Sandwich panel is commonly used in ship and marine engineering equipment,such as side structure and superstructure deck of a ship,which is of good anti-explosion performance.This paper addresses a study on the dynamic response of the U-typed sandwich panel under explosion load through the numerical simulation and theoretical methods.Based on the orthotropic plate theory,the U-typed sandwich panel is simplified and transformed into a single degree of freedom(SDOF)spring system,the equivalent motion equation of the SDOF system and the expression of triangular explosion load function are established based on the SDOF theory,and the maximum response spectrum of the SDOF system is obtained.Then,the response of the equivalent SDOF system of the U-typed sandwich panel under explosion load is analyzed,and the theoretical results match well with the numerical simulation results,which verifies the accuracy of the theoretical method proposed in this paper.The theoretical method proposed in this paper could have good engineering applications for the structural anti-explosion design,and provide a reference for the evaluation of the anti-explosion performance of ship and offshore platform structures.

关键词： U-typed sandwich panel the orthotropic plate theory oil and gas explosion SDOF method dynamic response

Distributed tracking control of unmanned aerial vehicles under wind disturbance and model uncertainty

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Journal of Systems Engineering and Electronics 2016年第6期27卷 1262-1271页

作者： kun Zhang Xiaoguang gao School of Electronics and Information Northwestern Polytechnical University

A distributed robust method is developed for cooperative tracking control of unmanned aerial vehicles under unknown wind disturbance and model uncertainty. The communication network among vehicles is a directed graph with switching topology. Each vehicle can only share its states with its neighbors. Dynamics of the vehicles are nonlinear and affected by the wind disturbance and model uncertainty. Feedback linearization is adopted to transform the dynamics of vehicles into linear systems. To account for the wind disturbance and model uncertainty, a robust controller is designed for each vehicle such that all vehicles ultimately synchronize to the virtual leader in the three-dimensional path. It is theoretically shown that the position states of the vehicles will converge to that of the virtual leader if the communication network has a directed spanning tree rooted at the virtual leader. Furthermore, the robust controller is extended to address the formation control problem. Simulation examples are also given to illustrate the effectiveness of the proposed method. ? 2016 Beijing Institute of Aerospace Information.

关键词： Aircraft control Controllers Directed graphs Feedback linearization Linear systems Mathematical transformations Navigation Topology Uncertainty analysis Unmanned aerial vehicles (UAV) Vehicles