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Belief reliability modeling and analysis for TPS considering physical principles,degradation mechanism and epistemic uncertainties

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Chinese Journal of Aeronautics 2025年第5期38卷 264-276页

作者： Dayu CHEN Yao LI Yiyang SHANGGUAN Zhiqiang LI Zhenqiang WU Xiaoyang LI Rui KANG School of Reliability and Systems Engineering Beihang University Science and Technology on Reliability and Environmental Engineering Laboratory Science and Technology on Reliability and Environment Engineering Laboratory Beijing Institute of Structure and Environment Engineering

Thermal Protection System(TPS) with thick tiles, low thermal conductivity, and a short re-entry stage stands as a critical element within reusable aircraft, whose reliability is related to the function and changes with their physical properties, external conditions, and degradation. Meanwhile, due to the limitation of testing resources, epistemic uncertainties stemming from the small samples are present in TPS reliability modeling. However, current TPS reliability modeling methods face challenges in characterizing the relationships among reliability and physical properties, external conditions, degradation, and epistemic uncertainties. Therefore, under the framework of belief reliability theory, a TPS reliability model is constructed, which takes into account the physical principle, external conditions, performance degradation, and epistemic uncertainties. A reliability simulation algorithm is proposed to calculate TPS reliability. Through a case study and comparison analysis, the proposed method is validated as more effective than the existing method. Additionally,reliability sensitivity analysis is conducted to identify the sensitive factors of reliability under the condition of small samples, through which suggestions are provided for TPS functional design and improvement.

关键词： Thermal protection system Physical principle Epistemic uncertainty Performance degradation Belief reliability modeling

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reliability modeling of mutual DCFP considering failure physical dependency

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Journal of Systems engineering and Electronics 2023年第4期34卷 1063-1073页

作者： CHEN Ying YANG Tianyu WANG Yanfang Science and Technology on Reliability and Environmental Engineering Laboratory Beihang UniversityBeijing 100191China

Degradation and overstress failures occur in many electronic systems in which the operation load and environmental conditions are *** dependency of them called dependent competing failure process(DCFP),has been widely *** system may experience mutual effects of degradation and shocks,they are considered to be *** the degradation and the shock processes will decrease the limit of system and cause cumulative ***,the competition of hard and soft failure will cause the system *** on the failure mechanism accumulation theory,this paper constructs the shock-degradation acceleration and the threshold descent model,and a system reliability model established by using these two *** mutually DCFP effect of electronic system interaction has been decomposed into physical correlation of failure,including acceleration,accumulation and *** a case,a reliability of electronic system in aeronautical system has been analyzed with the proposed *** method proposed is based on failure physical evaluation,and could provide important reference for quantitative evaluation and design improvement of the newly designed system in case of data deficiency.

关键词： electronic system dependent competing failure process(DCFP) failure physical dependency threshold descent model competition failure modes

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Simulation and Experiment of Windage Power Loss of A Shrouded Spiral Bevel Gears under Oil Injection Lubrication

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Chinese Journal of Mechanical engineering 2025年第2期38卷 413-432页

作者： Bo Li Kai Rong Xuyang Zhang Sanmin Wang U-Xuan Tan Xuanyuan Su Laifa Tao School of Mechanical Engineering Northwestern Polytechnical University Department of Engineering Product Development Singapore University of Technology and Design Hangzhou International Innovation Institute Beihang University National Key Laboratory of Science and Technology on Reliability and Environmental Engineering School of Reliability and Systems Engineering Beihang University

During high-speed rotation, the surface of aeronautic spiral bevel gears will generate significant pressure and viscous forces, which will cause a certain amount of windage power loss and reduce the efficiency of the transmission system. Based on the computational fluid dynamics, this paper analyzes the windage power loss of a single spiral bevel gear and a spiral bevel gear pair under oil injection lubrication. In addition, the shroud is used to suppress gear windage loss, and the clearance size and opening angle of the designed shroud are optimized. Finally, by comparing and analyzing the experimental results, the following conclusions were obtained:(1) For a single gear, the speed is the most important factor affecting windage loss, followed by the hand of spiral, and rotation direction;(2) For gear pairs, under oil injection lubrication, the input speed has the greatest impact on windage power loss, followed by the influence of oil injection port speed, temperature and oil injection port pressure;(3) Installing a shroud is an effective method to reduce windage power loss;(4) In the pure air phase, the smaller the clearance between the shroud and the gear surface, and the smaller the radial direction between the shroud and the shaft, the better the effect of reducing windage;(5) In the two-phase flow of oil and gas, it is necessary to design oil drainage holes on the shroud to ensure the smooth discharge of lubricating oil and improve the drag reduction effect.

关键词： Computational fluid dynamics (CFD) Oil injection lubrication Shroud Spiral bevel gear Windage power loss

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Belief reliability:a scientific exploration of reliability engineering

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Journal of Systems engineering and Electronics 2024年第3期35卷 619-643页

作者： ZHANG Qingyuan LI Xiaoyang ZU Tianpei KANG Rui International Innovation Institute Beihang UniversityHangzhou 311115China Science and Technology on Reliability and Environmental Engineering Laboratory Beijing 100191China School of Reliability Engineering and Systems Engineering Beihang UniversityBeijing 100191China School of Aeronautic Science and Engineering Beihang UniversityBeijing 100191China

This paper systematically introduces and reviews a scientific exploration of reliability called the belief *** with the origin of reliability engineering,the problems of present theories for reliability engineering are summarized as a query,a dilemma,and a ***,through philosophical reflection,we introduce the theoretical solutions given by belief reliability theory,including scientific principles,basic equations,reliability science experiments,and mathematical *** basic methods and technologies of belief reliability,namely,belief reliability analysis,function-oriented belief reliability design,belief reliability evaluation,and several newly developed methods and technologies are sequentially elaborated and *** on the above investigations,we summarize the significance of belief reliability theory and make some prospects about future research,aiming to promote the development of reliability science and engineering.

关键词： belief reliability performance margin reliability experiment chance measure uncertainty

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Pharmacokinetic model for extravascular administration based on uncertain differential equation

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Journal of Ambient Intelligence and Humanized Computing 2023年第10期14卷 13887-13899页

作者： Liu, Zhe Kang, Rui School of Reliability and Systems Engineering Beihang University Beijing100191 China Science and Technology on Reliability and Environmental Engineering Laboratory Beijing100083 China

Pharmacokinetics studies the time course of drug concentration in body compartments, and one of the commonly used methods of administration is extravascular administration. Undoubtedly, biological systems are subject to various internal and external noises that change over time. To rationally deal with these dynamic noises, this paper deduces a pharmacokinetic model for extravascular administration using uncertain differential equations for the first time. Some essential pharmacokinetic indexes such as drug concentration, area under the curve, and maximum drug concentration are investigated. Based on the three basic principles of reliability science, i.e., margin-based reliable principle, eternal degradation principle and uncertainty principle, the belief reliability for drug is investigated. The minimum cover estimation for the set of unknown parameters in this uncertain pharmacokinetic model is provided. Numerical example and a real data analysis illustrate our method in detail. Finally, the paradox of a stochastic pharmacokinetic model is presented. © 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

关键词： reliability

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Co-doped cryptomelane-type manganese oxide in situ grown on a nickel foam substrate for high humidity ozone decomposition

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Journal of environmental sciences 2025年第2期148卷 529-540页

作者： Haoyuan Liang Xu Wang Hui Wang Zhenping Qu Key Laboratory of Industrial Ecology and Environmental Engineering School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024China

Monolithic catalysts with excellent O_(3)catalytic decomposition performance were prepared by in situ loading of Co-doped KMn_(8)O_(16)on the surface of nickel *** triple-layer structure with Co-doped KMn_(8)O_(16)/Ni6MnO_(8)/Ni foam was grown spontaneously on the surface of nickel foam by tuning the molar ratio of KMnO_(4)to Co(NO_(3))_(2)·6H_(2)O ***,the formed Ni6MnO_(8)structure between KMn_(8)O_(16)and nickel foam during in situ synthesis process effectively protected nickel foam from further etching,which significantly enhanced the reaction stability of *** optimum amount of Co doping in KMn_(8)O_(16)was available when the molar ratio of Mn to Co species in the precursor solution was 2:*** the Mn2Co1 catalyst had abundant oxygen vacancies and excellent hydrophobicity,thus creating outstanding O_(3)decomposition *** O_(3)conversion under dry conditions and relative humidity of 65%,90%over a period of 5 hr was 100%,94%and 80%with the space velocity of 28,000 hr^(−1),*** in situ constructed Co-doped KMn_(8)O_(16)/Ni foam catalyst showed the advantages of low price and gradual applicability of the preparation process,which provided an opportunity for the design of monolithic catalyst for O_(3)catalytic decomposition.

关键词： Co-doped cryptomelane-type manganese O_(3)decomposition High humidity Nickel foam Monolithic catalyst

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reliability modelling and assessment of CMOS image sensor under radiation environment

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Chinese Journal of Aeronautics 2024年第9期37卷 297-311页

作者： Zhao TAO Wenbin CHEN Xiaoyang LI Rui KANG School of Reliability and Systems Enginering Beihang UniversityBejing 00191China Science and Technologyon Reliabiliy and Environmental Engineering Laboratory Beijing 100191China

The Complementary Metal-Oxide Semiconductor(CMOS)image sensor is a critical component with the function of providing accurate positioning in many space application *** long-time operation in space environments,there are radiation related degradation and var-ious uncertainties affecting the positioning accuracy of CMOS image sensors,which further leads to a reliability reduction of CMOS image ***,the reliability of CMOS image sensors is related to their specified function,degradation,and uncertainties;however,current research has not fully described this *** this paper,a comprehensive approach to reliability modelling of CMOs image sensors is proposed based on the reliability science ***,the perfor-mance margin modelling of centroid positioning accuracy is ***,the degradation model of CMOS image sensors is derived considering the dark current increase induced by the total ionizing dose ***,various uncertainties are analyzed and quantified,and the measure-ment equation of reliability is proposed.A case study of a CMOS image sensor is conducted to apply the proposed method,and the sensitivity analysis can provide suggestions for design and use of CMOS image sensors to ensure reliability.A simulation study is conducted to present the advantages oftheproposed comprehensive approach.

关键词： Complementary metal-oxide semiconductor image sensor Degradation reliability reliability science principles Total ionizingdose effects Uncertainty analysis

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Electronic system life prediction algorithm based on the physical of failure 15

Electronic system life prediction algorithm based on the phy...

引用

15th IEEE Global reliability and Prognostics and Health Management Conference, PHM-Beijing 2024

作者： Wang, Yanfang Chen, Ying Science and Technology on Reliability and Environmental Engineering Laboratory Beihang University Beijing China

ISBN: (纸本)9798350354010

Enhancing the availability and safety of electronic systems necessitates a comprehensive investigation into their reliability. This study proposes an electronic system life prediction algorithm based on the physics of failure. For commonly used components, both failure physical models and degradation physical models are presented. An improved binary decision diagram (BDD) is constructed, accompanied by the development of a model-solving algorithm. Ultimately, the proposed methodology is applied to the driver circuit board of an electronic controller as a specific case study, thereby demonstrating its effectiveness and validity. © 2024 IEEE.

关键词： Boolean functions

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Robust fully spin-polarized nodal chain in 3D metal-organic framework

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材料科学技术（英文版） 2025年第5期208卷 104-110页

作者： Xiaoyu Wei Ying Liu Lei Jin Cong Liu Xuefang Dai Guodong Liu Xiaoming Zhang State Key Laboratory of Reliability and Intelligence of Electrical Equipment and School of Materials Science and EngineeringHebei University of TechnologyTianjin 300130China

The identification of fully spin-polarized topological phases in magnetic inorganic materials has attracted significant *** this study,through first-principles calculations,we characterize CrCl2(pyz)2,a metal-organic framework(MOF),as a nodal chain *** results reveal a ferromagnetic ground state in this material,presenting as a half-metal with a single spin channel near the Fermi ***-ically,the spin-down states form a nodal chain close to the Fermi level,consisting of three nodal loops protected by glide mirror symmetry on distinct ***,fully spin-polarized drumhead sur-face states corresponding to these nodal loops are identified on the material's ***,we observe the persistence of the fully spin-polarized nodal chain even when tuning the ligand rotation an-gle of the ***,our investigation delves into the influence of spin-orbit coupling(SOC)on the system,revealing that it has minimal impact on the nodal *** robustness of the nodal chain in the presence of SOC underscores its intriguing and resilient nature,indicating its potential utility in various electronic ***,the robust realization of a fully spin-polarized nodal chain in this magnetic MOF system holds promise for applications in the realm of spintronics.

关键词： Topology MOFS Half-metal Fully spin-polarized Nodal chain

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Enhanced resistance to ciprofloxacin stress in integrated floating film activated sludge system filled with surface-modified carriers for simultaneous nitrification and denitrification

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Frontiers of environmental science & engineering 2025年第4期19卷 155-167页

作者： Jing Liu Zepeng Wang Tao Liu Xie Quan Key Laboratory of Industrial Ecology and Environmental Engineering(Ministry of Education) School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024China

While the effectiveness of integrated floating film activated sludge(IFFAS)system filled with surface-modified carriers has been demonstrated in promoting simultaneous nitrification and denitrification(SND)performance,the effect of antibiotic stress on this system remains ***,this study investigated the stress response of SND in IFFAS under short-and long-term exposure to ciprofloxacin(CIP),a commonly used *** indicated the significantly higher semi-inhibitory concentration of CIP in the IFFAS system with modified carriers(36.54 mg/L)than that in IFFAS with conventional high density polyethylene(HDPE)carriers(28.77 mg/L).IFFAS system with modified carriers exhibited improved resistance to CIP toxicity compared to IFFAS using HDPE carriers or conventional activated sludge under long-term exposure to CIP concentrations from 50 to 3000μg/*** surface-modified carriers demonstrated a multifaceted strategy to mitigate the inhibitory effects of CIP,such as enhancing production of extracellular polymeric substances(EPS)to serve as a potential protective barrier against CIP toxicity,the less suppression of key enzyme activities involved in nitrogen removal,as well as inducing the upregulation of antibiotic resistance genes(ARGs)(qepA,qnrB/C)and the integrase gene(intI1)to enhance target prevention and efflux pumping mechanisms for resistance to *** findings collectively underscored the efficacy of modified carriers in attenuating CIP toxicity within the SND system.

关键词： Simultaneous nitrification and denitrification(SND) Ciprofloxacin Modified carrier Resistance Extracellular polymeric substances(EPS)

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