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17th International Conference on Management of Large-Scale System Development, MLSD 2024

作者： Matkovskaya, Yana S. V.A. Trapeznikov Institute of Control Sciences of Ras Laboratory of Economic Dynamics and Innovation Management Moscow Russia

The author conceptualized the orchestration form of control over such large-scale systems as ecosystem business models, revealed its content, developed a conceptual model of load dispatching in ecosystem business mode... 详细信息

ISBN: (纸本)9798350375718

关键词： Large scale systems

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Morphological evolution and flow conduction characteristics of fracture channels in fractured sandstone under cyclic loading and unloading

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International Journal of Mining Science and Technology 2023年第12期33卷 1527-1540页

作者： Quanle Zou Zihan Chen Jinfei Zhan Chunmei Chen Shikang Gao Fanjie Kong Xiaofeng Xia State Key Laboratory of Coal Mine Disaster Dynamics and Control School of Resources and Safety EngineeringChongqing UniversityChongqing 400044China School of Mining Guizhou UniversityGuiyang 550025China

In coal mining,rock strata are fractured under cyclic loading and unloading to form fracture *** channels are the main flow narrows for ***,expounding the flow conductivity of fracture channels in rocks on fluids is significant for gas flow in rock *** this regard,graded incremental cyclic loading and unloading experiments were conducted on sandstones with different initial stress ***,the three-dimensional models for fracture channels in sandstones were ***,the fracture channel percentages were used to reflect the flow conductivity of fracture *** study revealed how the particle size distribution of fractured sandstone affects the formation and expansion of fracture *** was found that a smaller proportion of large blocks and a higher proportion of small blocks after sandstone fails contribute more to the formation of fracture *** proportion of fracture channels in fractured rock can indicate the flow conductivity of those *** the proportion of fracture channels varies gently,fluids flow evenly through those ***,if the proportion of fracture channels varies significantly,it can greatly affect the flow rate of *** research results contribute to revealing the morphological evolution and flow conductivity of fracture channels in sandstone and then provide a theoretical basis for clarifying the gas flow pattern in the rock strata of coal mines.

关键词： CT imaging Flow conductivity Three-dimensional reconstruction Proportion of fracture channels Cyclic loading and unloading

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Analytical Propagation of Space Debris Density for Collisions near Sun-Synchronous Orbits

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Space(Science & Technology) 2022年第1期2022卷 245-261页

作者： Yongjie Liu Yu Jiang Hengnian Li State Key Laboratory of Astronautic Dynamics Xi’an Satellite Control CenterXi’an 710043China

The increasing frequency of human launches has led to a dramatic increase in the amount of space debris,especially near sunsynchronous *** of the fragments are small in size,which may make tracking ***,characterizing the distribution,evolution,and collision risk of small debris has long been a difficult *** paper is aimed at investigating the orbital evolution and global dispersion behavior of debris clouds near sun-synchronous ***,the NASA breakup model is used to provide an initial distribution of small fragments after collision ***,the continuity equation is adopted to propagate the density variation ***,we introduce some statistical quantities and the entropy of debris clouds to model the randomness and band formation.A theorem concerning the equivalence of the band formation and maximal entropy is *** accuracy of the band formation time estimation is also *** noncatastrophic collisions at an altitude of 800 km due to a projectile with a mass of 100 g and a collision velocity of 1 km/s,we compare the analytical and numerical results of space debris *** results show that the maximal peak error is within 0.17,and the mean square error is about 0.25 at 400 ***,the entropy of right ascension of the ascending node is 8.5%less than that for debris clouds near an orbit with the same altitude and an inclination of 30 *** indicates the concentrating behavior for debris clouds near sun-synchronous orbits.

关键词： density. collision entropy

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Rapid Monitoring of Translation Style Metrics 17

Rapid Monitoring of Translation Style Metrics

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17th International Conference on Management of Large-Scale System Development, MLSD 2024

作者： Rusyaeva, Elena Akhobadze, Gurami V.A. Trapeznikov Institute of Control Sciences of Ras Laboratory of Economic Dynamics and Innovation Management Moscow Russia V.A. Trapeznikov Institute of Control Sciences of Ras Laboratory of Network Systems Control Moscow Russia

ISBN: (纸本)9798350375718

The method of rapid monitoring of linguistic analysis of translated written texts is presented as part of the development of a large-scale information and analytical system. This method is based on the comparison of idiostylistic indicators, using service words as identification markers. These markers characterize the unique features of translated texts, and their weight coefficients are calculated to compare the volume of words in translations produced by 'manual' and machine methods. © 2024 IEEE.

关键词： Machine translation

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Sound Reduction control in Acoustic Enclosure with Air Ventilation

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Acta Mechanica Solida Sinica 2023年第6期36卷 763-769页

作者： Mengyi Liu Xiaoming Zhou Key Laboratory of Dynamics and Control of Flight Vehicle of Ministry of Education Beijing Institute of TechnologyBeijing 100081China School of Aerospace Engineering Beijing Institute of TechnologyBeijing100081China

An acoustic enclosure system with both interior sound reduction and air ventilation is designed and *** system consists of a rectangular enclosed space coupled with ventilated metamaterials and microperforated panels(MPPs).By modeling the ventilated metamaterial as an impedance boundary condition,an analytic model is developed to characterize the frequency response of interior acoustic fields and evaluate the sound reduction performance of MPP *** simulations are conducted to validate the accuracy of the theoretical *** is found that the resonance response of the enclosure system can be suppressed by proper arrangement of the *** with open area for airflow,the system still possesses good sound isolation originating from the low-transmission behavior of the ventilated *** proposed model system may find potential applications in noise control engineering.

关键词： Acoustic enclosure Sound reduction Microperforated panel Air ventilation

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Non-reciprocal Sound Transmission in Electro-acoustic Systems with Time-Modulated Circuits

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Acta Mechanica Solida Sinica 2022年第6期35卷 940-948页

作者： Yu Huang Xiaoming Zhou Key Laboratory of Dynamics and Control of Flight Vehicle Ministry of EducationSchool of Aerospace EngineeringBeijing Institute of TechnologyBeijing100081China

Non-reciprocal sound transmission is demonstrated in an electro-acoustic system consisting of two shunt loudspeakers with time-modulated *** shunt circuit is modulated by periodically varying the resistance in time sequence,and a phase difference of time modulation is set between two sets of loudspeakers to produce a spatial *** spatiotemporal modulation of acoustic properties is thus formed to break the *** theoretical model based on the transfer-matrix method is developed to predict acoustic scatterings of electro-acoustic *** asymmetric transmission in opposite directions is disclosed by the model and is verified by time-domain simulation results based on the finite-difference time-domain *** transmission in multiple frequency bands can be created by tuning circuit parameters,showing their ability in regulating acoustic non-reciprocal *** study may provide a platform for the design of compact and non-reciprocal acoustic devices with applications to efficient noise control.

关键词： Non-reciprocity Shunt loudspeaker Time-varying circuits Spatiotemporal modulation

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On the evidential reasoning rule for dependent evidence combination

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Chinese Journal of Aeronautics 2023年第5期36卷 306-327页

作者： Peng ZHANG Zhijie ZHOU Shuaiwen TANG Jie WANG Guanyu HU Dao ZHAO You CAO Rocket Force University of Engineering Xi’an 710025China State Key Laboratory of Astronautic Dynamics Xi’an Satellite Control CenterXi’an 710043China Guangxi Key Laboratory of Trusted Software Guilin University of Electronic TechnologyGuilin 541004China

Evidential Reasoning(ER)rule,which can combine multiple pieces of independent evidence conjunctively,is widely applied in multiple attribute decision ***,the assumption of independence among evidence is often not satisfied,resulting in ER rule *** this paper,an Evidential Reasoning rule for Dependent Evidence combination(ERr-DE)is ***,the aggregation sequence of multiple pieces of evidence is determined according to evidence *** this basis,a calculation method of evidence Relative Total Dependence Coefficient(RTDC)is proposed using the distance correlation ***,as a discounting factor,RTDC is introduced into the ER rule framework,and the ERr-DE model is *** aggregation process of two pieces of dependent evidence by ERr-DE is investigated,which is then generalized to aggregate multiple pieces of non-independent ***,sensitivity analysis is carried out to investigate the relationship between the model output and the *** properties of sensitivity coefficient are explored and mathematically *** conjunctive probabilistic reasoning process of ERr-DE and the properties of sensitivity coefficient are verified by two numerical examples ***,the practical application of the ERr-DE is validated by a case study on the performance assessment of satellite turntable system.

关键词： Evidential reasoning rule Dependent evidence Relative total dependence coefficient Aggregation sequence Performance assessment

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A new type of shale gas reservoir—carbonate-rich shale: From laboratory mechanical characterization to field stimulation strategy

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Petroleum Science 2024年第5期21卷 3047-3061页

作者： Zhen-Hui Bi Lei Wang Chun-He Yang Yin-Tong Guo Wu-Hao Guo Han-Zhi Yang Key Laboratory of Geomechanics and Geotechnical Engineering Safety Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071HubeiChina University of Chinese Academy of Sciences Beijing100049China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing400044China

Recently, a new promising type of marine shale gas reservoir, carbonate-rich shale, has been *** the mechanical properties of this type of shale were still unrevealed and the corresponding reservoir stimulation design was lack of guidance. Using the deep downhole cores of an exploratory carbonate-rich shale gas well, the physical and mechanical parameters and failure mechanism of the whole reservoir section were acquired and evaluated systematically, by performing XRD, tri-axial compression, Brazilian splitting, and fracture toughness tests. A new model was established to evaluate the reservoir brittleness based on fracture morphology and stress-strain curve. Recommended strategy for reservoir stimulation was discussed. Results showed that(1) Carbonate-rich shale possessed high compressive strength and high Young's modulus, which were improved by 10.74% and 3.37% compared to that of siliceous shale. It featured high tensile strength and fracture toughness, with insignificant anisotropy.(2) With the content of carbonate minerals increasing, the shear failure morphology transformed from sparse and wide brittle fractures to diffusely distributed and subtle plastic cracks.(3) The brittleness index order was: siliceous shale, clay-rich shale, carbonate-rich shale, and limestone.(4) The special properties of carbonate-rich shale were rooted in the inherent feature of carbonate minerals(high strength, high elastic modulus,and cleavage structure), resulting in greater challenge in reservoirs stimulation. The above findings would promote the understanding of carbonate-rich shale reservoirs and provide reference for the optimum design of reservoir stimulation.

关键词： Carbonate-rich shale Brittleness evaluation Mechanical property Lithological difference Reservoir stimulation

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Plasmonic hybridization properties in polyenes octatetraene molecules based on theoretical computation

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Chinese Physics B 2023年第3期32卷 419-428页

作者：高楠朱国栋黄映洲方蔚瑞 Key Laboratory of Materials Modification by Laser Electronand Ion Beams(Ministry of Education)and School of PhysicsDalian University of TechnologyDalian 116024China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China

Relationship of plasmonic properties of multiple clusters to molecular interactions and properties of a single cluster or molecule have become increasingly important due to the continuous emergence of molecular and cluster devices or systems.A hybrid phenomenon similar to plasmonic nanoparticle hybridization exists between two molecules with plasmon excitation *** use linear-response time-dependent density functional theory,real-time propagation time-dependent density functional theory,the plasmonicity index,and transition contribution maps(TCMs)to identify the plasmon excitation modes for the linear polyenes octatetraene with–OH and–NH_(2)groups and analyze the hybridization characteristics using charge *** results show that molecular plasmon hybridization exists when the two molecules are *** TCM analysis shows that the plasmon modes and hybridization result from collective and single-particle *** plasmon mode is stronger,and the individual properties of the molecules are maintained after coupling when there is extra charge depose in the molecules because the electrons are moving in the *** study provides new insights into the molecular plasmon hybridization of coupled molecules.

关键词： plasmon hybridization molecular plasmon time-dependent density functional theory(TDDFT)

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Enhancing spool valve sealing performance with an annular groove 3

Enhancing spool valve sealing performance with an annular gr...

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2024 3rd International Conference on Aerospace, Aerodynamics and Mechatronics Engineering, AAME 2024

作者： Xia, Haijie Zhang, Guoqing Key Laboratory of Dynamics and Control of Flight Vehicle School of Aerospace Engineering Beijing Institute of Technology Beijing100081 China

Spool valves in aviation engine fuel control devices have a vital effect on fuel supply to ensure the engine runs properly. Therefore, the sealing performance of valve components is particularly important for the overall performance and safety of the system. A more accurate fit between the valve body and the moving parts is needed to enhance the sealing performance of the spool valve. However, leaks still exist even with more precise manufacturing due to various factors. This paper proposes a novel design, an annular groove, which differs from previous methods and is described by the dimensionless design parameters of the spool valve. This paper concludes that dimensionless parameters depth h/d and relative position l/L of the annular groove have little influence on the leakage amount. Still, the width w/d has an obvious influence on that. The lower the w/d is, the smaller the leakage is, and the greater the vice versa. According to the simulation calculation, this is mainly because w is easier to induce the reverse pressure gradient of the flow field, leading to the formation of vortices within the annular groove and a consequent reduction in induced velocity, thereby minimizing leakage. © Published under licence by IOP Publishing Ltd.

关键词： Reels

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