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Finite-Time Sliding-Mode Control for Semi-Markov Systems With Delayed Impulses 认领 引用 被引量：1
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作者 Fangmin Ren Xiaoping Wang +1 位作者 Yangmin Li Zhigang Zeng 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第3期740-742,共3页
Dear Editor,This letter concerns the design of sliding mode control(SMC)for semi-Markov switching systems with time-varying transmission and impulse delay.The difficulties of this problem are:1)Time-varying transmissi... Dear Editor,This letter concerns the design of sliding mode control(SMC)for semi-Markov switching systems with time-varying transmission and impulse delay.The difficulties of this problem are:1)Time-varying transmission and impulse delay bring more nonlinear dynamic characteristics and lag effects;2)Semi-Markov mode switching introduces uncertainty;3)The reachable stage and sliding stage are affected by two types of impulses in the system,which increases the complexity of theoretical derivation. 展开更多
关键词 finite time sliding mode control sliding mode control smc semi Markov systems lag effects semi markov reachable stage sliding stage theoretical derivation impulse delay time varying transmission
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A Novel Finite-Time Stability Criterion for Nonlinear Systems Involving Flexible Delayed Impulses 认领 引用
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作者 Shuchen Wu Xiaodi Li Shiji Song 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第3期746-748,共3页
Dear Editor,This letter studies the finite-time stability(FTS)problem of nonlinear impulsive systems with delayed impulses.The system under consideration is subjected to a flexible class of time-varying delays in impu... Dear Editor,This letter studies the finite-time stability(FTS)problem of nonlinear impulsive systems with delayed impulses.The system under consideration is subjected to a flexible class of time-varying delays in impulsive signals,allowing them to arbitrarily span one or more impulse instants.Sufficient Lyapunov-based conditions for FTS of such systems are presented,where a novel class of impulse time sequences is established for all admissible uncertainties of delayed impulses. 展开更多
关键词 delayed impulsesthe impulsive signalsallowing finite time stability nonlinear systems Lyapunov based conditions time varying delays nonlinear impulsive systems delayed impulses
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Advances in research on impulse hydro‐turbine technology 认领 引用
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作者 Xiaochao Li Ye Zhou +5 位作者 Hao Zhang Guanglei Xiao Yanwei Li Zhongxin Gao Zhiyang Lu Shangqi Li 《River》 EI CSCD 2026年第1期112-133,共22页
To accelerate the development of impulse hydro‐turbines and support the efficient utilization of hydropower resources in Southwest China,this paper examines the background,historical development,and research progress... To accelerate the development of impulse hydro‐turbines and support the efficient utilization of hydropower resources in Southwest China,this paper examines the background,historical development,and research progress of impulse hydroturbines.By analyzing energy development data,hydropower potential,and research trends in impulse hydro‐turbines,we provide a comprehensive review based on existing studies and technical achievements from domestic and international scholars.This paper focuses on five key components:distributors,injectors(including deflectors),runners,auxiliary systems,and engineering applications.For each part,the working principles and technological progress are detailed.Furthermore,five main findings are highlighted—such as the role of impulse hydropower in addressing China's energy crisis—and five recommendations are put forward,including the need to strengthen related technological capabilities in China.This review aims to provide a reference for further research and industrial development. 展开更多
关键词 hydropower impulse hydro‐turbines Pelton hydro‐turbines numerical simulation sediment erosion
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Exponential Synchronization of Infinite-Dimensional Stochastic Systems With Poisson Jumps Under Aperiodically Intermittent Impulse Control 认领 引用
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作者 Lili Chen Yiqun Liu +1 位作者 Yanfeng Zhao Zhen Wang 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第2期383-393,共11页
A novel aperiodically intermittent impulse control(AIIC)method is proposed to investigate the exponential synchronization in mean square(ESMS)of a class of impulsive stochastic infinite-dimensional systems with Poisso... A novel aperiodically intermittent impulse control(AIIC)method is proposed to investigate the exponential synchronization in mean square(ESMS)of a class of impulsive stochastic infinite-dimensional systems with Poisson jumps(ISIDSP).The AIIC control strategy inherits the flexibility of aperiodically intermittent control,including the variable control period,adjustable control interval length,and the discretization of impulsive control.In addition,this article introduces a novel mild Itô's formula.By leveraging semigroup theory,the contraction mapping principle,and graph theory,along with constructing the Lyapunov function,the criterion for the existence and uniqueness of a mild solution of ISIDSP is thereby established.Furthermore,the mean-square exponential synchronization problem of the above systems is resolved,and the constraints within the mild solution domain are alleviated.These criteria clarify the impact of control parameters,control intervals and network topology on ESMS.The theoretical results are subsequently applied to a class of neural networks with reaction-diffusion processes,and the validity of the results is verified using numerical simulations. 展开更多
关键词 Complex network exponential synchronization impulse control infinite dimensional system intermittent control
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Video Head Impulse Testing in Relapsing Remitting Multiple Sclerosis:Evaluation of Canal Gains,Asymmetry,and Corrective Saccades with Cerebellar Lesions 认领 引用
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作者 Emel Tahir Asuman Kücüköner +2 位作者 Esra Kavaz Uştu Sedat Sen Murat Terzi 《Journal of Otology》 CSCD 2026年第2期123-129,共7页
Objective:This study aimed to compare video head impulse test(vHIT)metrics in relapsing-remitting multiple sclerosis(RRMS)versus controls,test differences by cerebellar MRI status within RRMS,and explore clinical/MRI ... Objective:This study aimed to compare video head impulse test(vHIT)metrics in relapsing-remitting multiple sclerosis(RRMS)versus controls,test differences by cerebellar MRI status within RRMS,and explore clinical/MRI correlates of corrective saccades.Methods:Single-center prospective study including 35 adults with RRMS and 35 age-/sex-matched controls.Disability was quantified by EDSS;a blinded neuroradiologist classified cerebellar involvement.The MS cohort was categorized into two subgroups according to the occurrence of cerebellar lesions.Each group participated in a vHIT to assess VOR gain.Results:RRMS participants had low disability(mean EDSS 0.95).Compared with controls,RRMS showed lower VOR gain in the right anterior/posterior,left posterior,and left lateral canals and higher asymmetry across RALP,LARP,and lateral planes(p=0.012,0.024,0.05);corrective-saccade prevalence was similar(33.3%vs 35.0%;chisquare p=0.918).In regression,cerebellar involvement,relapse count,EDSS,and disease duration were not associated with recurrent corrective saccades.Conclusion:vHIT reveals canal-selective gain reductions and elevated asymmetry in patients with mildly disabled RRMS,but these abnormalities do not differ by cerebellar MRI status. 展开更多
关键词 multiple sclerosis vertigo video head impulse test
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Propagation characteristics of pressure waves caused by arc discharge in oil under impulse voltage 认领 引用
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作者 Yuhang Li Yuanxiang Zhou +1 位作者 Junguang Yin Jianning Chen 《iEnergy》 EI 2026年第1期87-96,共10页
Arc faults within the transformers can generate sudden pressure surges,constituting significant hazards that may precipitate oil tank explosions and severely compromise power system stability.Conventional power−freque... Arc faults within the transformers can generate sudden pressure surges,constituting significant hazards that may precipitate oil tank explosions and severely compromise power system stability.Conventional power−frequency arc discharge experiments encounter limitations in isolating pressure wave characteristics due to persistent gas generation and arc reignition.To circumvent these challenges,an oil-immersed impulse voltage discharge platform was conceived and engineered to investigate pressure wave propagation dynamics.A pressure numerical simulation model and theoretical model of oil−solid interface reflection and refraction were subsequently established to elucidate the pressure propagation mechanism.The experimental and simulation results show that the pressure wave generated by pulsed arc discharge in oil propagates radially in the form of spherical waves.Due to the viscous loss and wave front expansion of transformer oil,the peak pressure decays exponentially with distance,with a decay coefficientβ=1.15.When pressure waves encounter metal obstacles inside transformer oil,there are two propagation paths:direct transmission through and multiple reflections through,and a mode transformation of pressure waves occurs at the oil−solid interface,mainly propagating through obstacles in the form of transverse waves.This work quantitatively delineates the energy pressure wave coupling,propagation dynamics,and attenuation mechanisms,providing critical insights for assessing and mitigating arc fault-induced transformer explosion risks. 展开更多
关键词 Transformer oil Impulse discharge Pressure wave Propagation Liquid−solid interface
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A Verification Theorem for Feedback Nash Equilibrium in Multiple-Player Nonzero-Sum Impulse Game 认领 引用 被引量：1
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作者 Ruihai Li Yaoyao Tan +1 位作者 Xiaojie Su Jiangshuai Huang 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2025年第3期648-650,共3页
Dear Editor,This letter addresses the impulse game problem for a general scope of deterministic,multi-player,nonzero-sum differential games wherein all participants adopt impulse controls.Our objective is to formulate... Dear Editor,This letter addresses the impulse game problem for a general scope of deterministic,multi-player,nonzero-sum differential games wherein all participants adopt impulse controls.Our objective is to formulate this impulse game problem with the modified objective function including interaction costs among the players in a discontinuous fashion,and subsequently,to derive a verification theorem for identifying the feedback Nash equilibrium strategy. 展开更多
关键词 impulse game feedback Nash equilibrium multiple player feedback nash equilibrium strategy impulse game problem nonzero sum modified objective function impulse controlsour
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Optimal Impulse Control and Impulse Game for Continuous-Time Deterministic Systems:A Review 认领 引用
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作者 Chuandong LI Wenxuan WANG 《Artificial Intelligence Science and Engineering》 2025年第3期208-219,共12页
Optimal impulse control and impulse games provide the cutting-edge frameworks for modeling systems where control actions occur at discrete time points,and optimizing objectives under discontinuous interventions.This r... Optimal impulse control and impulse games provide the cutting-edge frameworks for modeling systems where control actions occur at discrete time points,and optimizing objectives under discontinuous interventions.This review synthesizes the theoretical advancements,computational approaches,emerging challenges,and possible research directions in the field.Firstly,we briefly review the fundamental theory of continuous-time optimal control,including Pontryagin's maximum principle(PMP)and dynamic programming principle(DPP).Secondly,we present the foundational results in optimal impulse control,including necessary conditions and sufficient conditions.Thirdly,we systematize impulse game methodologies,from Nash equilibrium existence theory to the connection between Nash equilibrium and systems stability.Fourthly,we summarize the numerical algorithms including the intelligent computation approaches.Finally,we examine the new trends and challenges in theory and applications as well as computational considerations. 展开更多
关键词 optimal impulse control impulse game Pontryagin's maximum principle dynamic programming principle
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Surface-covering water significantly amplifies the explosion impulse of shallow buried explosives 认领 引用 被引量：2
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作者 Zhenyu Zhao Wenbo Gao +6 位作者 Jianwei Ren Zihan Lan Zhiyang Zhang Huiyao Gao Chao He Changye Ni Tianjian Lu 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2025年第6期156-172,共17页
While the moisture content of soil affects significantly the blast impulse of shallow buried explosives,the role of surface-covering water(SCW)on soil in such blast impulse remains elusive.A combined experimental and ... While the moisture content of soil affects significantly the blast impulse of shallow buried explosives,the role of surface-covering water(SCW)on soil in such blast impulse remains elusive.A combined experimental and numerical study has been carried out to characterize the effect of SCW on transferred impulse and loading magnitude of shallow buried explosives.Firstly,blast tests of shallow buried explosives were conducted,with and without the SCW,to quantitatively assess the blast loading impulse.Subsequently,finite element(FE)simulations were performed and validated against experimental measurement,with good agreement achieved.The validated FE model was then employed to predict the dynamic response of a fully-clamped metallic circular target,subjected to the explosive impact of shallow buried explosives with SCW,and explore the corresponding physical mechanisms.It was demonstrated that shallow buried explosives in saturated soil generate a greater impulse transferred towards the target relative to those in dry soil.The deformation displacement of the target plate is doubled.Increasing the height of SCW results in enhanced center peak deflection of the loaded target,accompanied by subsequent fall,due to the variation of deformation pattern of the loaded target from concentrated load to uniform load.Meanwhile,the presence of SCW increases the blast impulse transferred towards the target by three times.In addition,there exists a threshold value of the burial depth that maximizes the impact impulse.This threshold exhibits a strong sensitivity to SCW height,decreasing with increasing SCW height.An empirical formula for predicting threshold has been provided.Similar conclusions can be drawn for different explosive masses.The results provide technical guidance on blast loading intensity and its spatial distribution considering shallow buried explosives in coast-land battlefields,which can ultimately contribute to better protective designs. 展开更多
关键词 Shallow buried explosives Fluid-structure interaction Surface-covering water Impulse distribution
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Spacecraft multi-impulse reachable domain 认领 引用 被引量：1
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作者 Sai ZHANG Zhen YANG Yazhong LUO 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2025年第9期323-335,共13页
The concept of the spacecraft Reachable Domain(RD)has garnered significant scholarly attention due to its crucial role in space situational awareness and on-orbit service applications.While the existing research has l... The concept of the spacecraft Reachable Domain(RD)has garnered significant scholarly attention due to its crucial role in space situational awareness and on-orbit service applications.While the existing research has largely focused on single-impulse RD analysis,the challenge of Multi-Impulse RD(MIRD)remains a key area of interest.This study introduces a methodology for the precise calculation of spacecraft MIRD.The reachability constraints specific to MIRD are first formulated through coordinate transformations.Two restricted maneuvering strategies are examined.The derivation of two extremum conditions allows for determining the accessible orientation range and the nodes encompassing the MIRD.Subsequently,four nonlinear programming models are developed to address two types of MIRD by skillfully relaxing constraints using scale factors.Numerical results validate the robustness and effectiveness of the proposed approach,showing substantial agreement with Monte Carlo simulations and confirming its applicability to spacecraft on various elliptical orbits. 展开更多
关键词 Orbital maneuver Reachable domain Multiple impulses Space situational awareness Nonlinear programing
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The impact of social media factors on impulse buying behaviors among generation Z:a study with fear of missing out as a mediating variable 认领 引用
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作者 Mingshuo Gao Natalie Nguyen 《Advances in Social Behavior Research》 2026年第7期14-31,共18页
This research examined the role of fear of missing out and other correlated median factors in their influence to impulsive buying behavior among generation Z(people who were born in 1995-2010,age 15-30)by using online... This research examined the role of fear of missing out and other correlated median factors in their influence to impulsive buying behavior among generation Z(people who were born in 1995-2010,age 15-30)by using online questionnaires.In the survey,participants self report their attitudes and personal experiences of fear of missing out and impulsive buying behavior.Other median factors(influencer credibility,comments of products,algorithmic personalization and marketing strategies)also were obtained.The findings generally show that influencer credibility and comments of products have no significant effects on leading to fear of missing out.Nonetheless,personalized algorithmic information and marketing strategies have positive effects on the phenomenon of fear of missing out,which also were possible reasons for impulsive buying behaviors in generation Z.The research indicates people nowadays should build awareness to identify the promotional information exhibited by social media,and be more rational when facing an impulsiveness of purchasing. 展开更多
关键词 FOMO impulsive buying social media generation Z
Force and impulse multi-sensor based on flexible gate dielectric field effect transistor 认领 引用
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作者 Chao Tan Junling Lü +3 位作者 Chunchi Zhang Dong Liang Lei Yang Zegao Wang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2025年第1期214-220,共7页
Nowadays,force sensors play an important role in industrial production,electronic information,medical health,and many other fields.Two-dimensional material-based filed effect transistor(2D-FET)sensors are competitive ... Nowadays,force sensors play an important role in industrial production,electronic information,medical health,and many other fields.Two-dimensional material-based filed effect transistor(2D-FET)sensors are competitive with nano-level size,lower power consumption,and accurate response.However,few of them has the capability of impulse detection which is a path function,expressing the cumulative effect of the force on the particle over a period of time.Herein we fabricated the flexible polymethyl methacrylate(PMMA)gate dielectric MoS2-FET for force and impulse sensor application.We systematically investigated the responses of the sensor to constant force and varying forces,and achieved the conversion factors of the drain current signals(Ids)to the detected impulse(I).The applied force was detected and recorded by Idswith a low power consumption of~30 nW.The sensitivity of the device can reach~8000%and the 4×1 sensor array is able to detect and locate the normal force applied on it.Moreover,there was almost no performance loss for the device as left in the air for two months. 展开更多
关键词 flexible gate dielectric transistor force sensor impulse sensor force sensor array
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Finite-Time Stability of Impulsive and Switched Hybrid Systems With Delay-Dependent Impulses 认领 引用
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作者 Taixiang Zhang Jinde Cao +1 位作者 Mahmoud Abdel-Aty Ardak Kashkynbayev 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2025年第2期466-468,共3页
Dear Editor,This letter studies finite-time stability (FTS) of impulsive and switched hybrid systems with delay-dependent impulses. Some conditions, based on Lyapunov method, are proposed for ensuring FTS and estimati... Dear Editor,This letter studies finite-time stability (FTS) of impulsive and switched hybrid systems with delay-dependent impulses. Some conditions, based on Lyapunov method, are proposed for ensuring FTS and estimating settling-time function (STF) of the hybrid systems.When switching dynamics are FTS and impulsive dynamics involve destabilizing delay-dependent impulses, the FTS is retained if the impulses occur infrequently. 展开更多
关键词 finite time stability delay dependent impulses hybrid systemswhen switching dynamics impulsive dynamics impulsive switched hybrid systems switched systems lyapunov method
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Impulsive thrust strategy for orbital pursuit-evasion games based on impulse-like constraint 认领 引用 被引量：6
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作者 Hongbo WANG Yao ZHANG +1 位作者 Hao LIU Kunpeng ZHANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2025年第1期520-536,共17页
This paper proposes a novel impulsive thrust strategy guided by optimal continuous thrust strategy to address two-player orbital pursuit-evasion game under impulsive thrust control.The strategy seeks to enhance the in... This paper proposes a novel impulsive thrust strategy guided by optimal continuous thrust strategy to address two-player orbital pursuit-evasion game under impulsive thrust control.The strategy seeks to enhance the interpretability of impulsive thrust strategy by integrating it within the framework of differential game in traditional continuous systems.First,this paper introduces an impulse-like constraint,with periodical changes in thrust amplitude,to characterize the impulsive thrust control.Then,the game with the impulse-like constraint is converted into the two-point boundary value problem,which is solved by the combined shooting and deep learning method proposed in this paper.Deep learning and numerical optimization are employed to obtain the guesses for unknown terminal adjoint variables and the game terminal time.Subsequently,the accurate values are solved by the shooting method to yield the optimal continuous thrust strategy with the impulse-like constraint.Finally,the shooting method is iteratively employed at each impulse decision moment to derive the impulsive thrust strategy guided by the optimal continuous thrust strategy.Numerical examples demonstrate the convergence of the combined shooting and deep learning method,even if the strongly nonlinear impulse-like constraint is introduced.The effect of the impulsive thrust strategy guided by the optimal continuous thrust strategy is also discussed. 展开更多
关键词 Orbital pursuit-evasion game Differential game Impulsive thrust Deep learning Shooting method
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Intelligent sequential multi-impulse collision avoidance method for non-cooperative spacecraft based on an improved search tree algorithm 认领 引用 被引量：3
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作者 Xuyang CAO Xin NING +4 位作者 Zheng WANG Suyi LIU Fei CHENG Wenlong LI Xiaobin LIAN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2025年第4期378-393,共16页
The problem of collision avoidance for non-cooperative targets has received significant attention from researchers in recent years.Non-cooperative targets exhibit uncertain states and unpredictable behaviors,making co... The problem of collision avoidance for non-cooperative targets has received significant attention from researchers in recent years.Non-cooperative targets exhibit uncertain states and unpredictable behaviors,making collision avoidance significantly more challenging than that for space debris.Much existing research focuses on the continuous thrust model,whereas the impulsive maneuver model is more appropriate for long-duration and long-distance avoidance missions.Additionally,it is important to minimize the impact on the original mission while avoiding noncooperative targets.On the other hand,the existing avoidance algorithms are computationally complex and time-consuming especially with the limited computing capability of the on-board computer,posing challenges for practical engineering applications.To conquer these difficulties,this paper makes the following key contributions:(A)a turn-based(sequential decision-making)limited-area impulsive collision avoidance model considering the time delay of precision orbit determination is established for the first time;(B)a novel Selection Probability Learning Adaptive Search-depth Search Tree(SPL-ASST)algorithm is proposed for non-cooperative target avoidance,which improves the decision-making efficiency by introducing an adaptive-search-depth mechanism and a neural network into the traditional Monte Carlo Tree Search(MCTS).Numerical simulations confirm the effectiveness and efficiency of the proposed method. 展开更多
关键词 Non-cooperative target Collision avoidance Limited motion area Impulsive maneuver model Search tree algorithm Neural networks
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Risk prevention and control of landslide-generated impulse waves in Wangjiashan area of Baihetan Reservoir on Jinsha River,China 认领 引用
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作者 QIN Panpan HUANG Bolin +3 位作者 DONG Xingchen CHEN Xiaoting XU Kaikai BAI Linfeng 《Journal of Mountain Science》 SCIE CSCD 2025年第6期1993-2012,共20页
Economically and effectively managing the risk of landslide-generated impulse waves(LGIWs)presents a significant challenge following the impoundment of newly constructed reservoirs in western China.To address this iss... Economically and effectively managing the risk of landslide-generated impulse waves(LGIWs)presents a significant challenge following the impoundment of newly constructed reservoirs in western China.To address this issue,we selected the Wangjiashan(WJS)landslide in the Baihetan Reservoir area as a case study to evaluate LGIW hazards and develop corresponding mitigation strategies.Using 2D physical model tests and 3D numerical simulations,we established a 3D hazard assessment method for LGIWs based on 2D experimental results.This method confirmed the effectiveness of slope-cutting engineering in mitigating LGIW hazards.Based on this assessment framework,we proposed a novel approach for LGIW risk reduction.The results showed that the maximum wave amplitude reached 19.64 m in the Jinsha River channel,and the maximum run-up was 11.5 m in the XiangBiLing(XBL)community,indicating a substantial LGIW threat to the area.By reducing the rear edge of the sliding mass to 920 m above sea level(asl),the LGIW risk to the XBL community could be lowered to a tolerable level.Compared with traditional landslide prevention and control measures,the proposed mitigation scheme can reduce excavation costs by approximately 37 million CNY,making it a more scientifically sound and economically feasible solution.We explored the concept and the implementation of LGIW risk mitigation in depth,offering new insights for global LGIW risk management.This case study enhances our understanding of LGIW hazard prevention and provides valuable guidance for policymaking and engineering practices in similar geological settings worldwide. 展开更多
关键词 Wangjiashan landslide Landslidegenerated impulse waves Physical model test Boussinesq model Risk prevention and control
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Numerical investigation on vortex dynamics of flow around a pitching hydrofoil via the finite-domain impulse theory 认领 引用
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作者 Hui-Yun Hao Yun-Qing Liu +1 位作者 Qin Wu Ying Liu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2025年第1期82-94,共13页
The behaviors of unsteady flow structures and corresponding hydrodynamics for a pitching hydrofoil are investigated numerically and theoretically in the present paper.The aims are to derive the total lift by finite-do... The behaviors of unsteady flow structures and corresponding hydrodynamics for a pitching hydrofoil are investigated numerically and theoretically in the present paper.The aims are to derive the total lift by finite-domain impulse theory for subcavitating flow(σ=8.0)and cavitating flow(σ=3.0),and to quantify the distinct impact of individual vortex structures on the transient lift to appreciate the interplay among cavitation,flow structures,and vortex dynamics.The motion of the hydrofoil is set to pitch up clockwise with an almost constant rate from 0°to 15°and then back to 0°,for the Reynolds number,7.5×105,and the frequency,0.2 Hz,respectively.The results reveal that the presence of cavities delays the migration of the laminar separation bubble(LSB)from the trailing edge(TE)to the leading edge(LE),consequently postponing the hysteresis in the inflection of lift coefficients.The eventual stall under the sub-cavitation regime is the result of LSB bursting.While the instabilities within the leading-edge LSB induce the convection of cavitation-dominated vortices under the cavitation regime instead.Having validated the lift coefficients on the hydrofoil through the finite-domain impulse theory using the standard force expression,the Lamb vector integral emerges as the main contribution to the generation of unsteady lift.Moreover,the typical vortices’contributions to the transient lift during dynamic stall are accurately quantified.The analysis indicates that the clockwise leading-edge vortex(−LEV)contributes positively,while the counterclockwise trailing-edge vortex(+TEV)contributes negatively.The negative influence becomes particularly pronounced after reaching the peak of total lift,as the shedding of the concentrated wake vortex precipitates a sharp decline due to a predominant negative lift contribution from the TEV region.Generally,the vortices’contribution is relatively modest in sub-cavitating flow,but it is notably more significant in the context of incipient cavitating flow. 展开更多
关键词 Cavitation Vortex dynamics Finite-domain impulse theory Pitching hydrofoil Laminar separation bubble Dynamic stall
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Approximate Controllability of Neutral Partial Differential System with Hilfer Fractional Derivative and not Instantaneous Impulses Effects 认领 引用
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作者 Bo ZHU Baoyan HAN 《Journal of Mathematical Research with Applications》 CSCD 2025年第5期637-648,共12页
In this article,we study the approximate controllability of neutral partial differential equations with Hilfer fractional derivative and not instantaneous impulses effects.By using the Sadovskii's fixed point theo... In this article,we study the approximate controllability of neutral partial differential equations with Hilfer fractional derivative and not instantaneous impulses effects.By using the Sadovskii's fixed point theorem,fractional calculus and resolvent operator functions,we prove the approximate controllability of the considered system. 展开更多
关键词 approximate controllability Hilfer fractional derivative not instantaneous impulses resolvent operator functions
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Stochastic Periodic Solutions for Two Populations Game Models with Impulses 认领 引用
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作者 HOU Meiting QIU Xiaoling 《应用数学》 北大核心 2025年第2期453-467,共15页
The article studies the evolutionary dynamics of two-population two-strategy game models with and without impulses. First, the payment matrix is given and two evolutionary dynamics models are established by adding sto... The article studies the evolutionary dynamics of two-population two-strategy game models with and without impulses. First, the payment matrix is given and two evolutionary dynamics models are established by adding stochastic and impulse. For the stochastic model without impulses, the existence and uniqueness of solution, and the existence of positive periodic solutions are proved, and a sufficient condition for strategy extinction is given. For the stochastic model with impulses, the existence of positive periodic solutions is proved. Numerical results show that noise and impulses directly affect the model, but the periodicity of the model does not change. 展开更多
关键词 Periodic solution Stochastic game Impulses Strategy extinct
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Asymptotic Behavior Analysis for Stochastic Integro-Differential Equations with Impulses and Poisson Jumps 认领 引用
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作者 CUI Jing WU Huanran 《应用概率统计》 CSCD 北大核心 2025年第6期864-889,共26页
In this work,we investigate the existence and asymptotic stability in mean square of mild solutions for non-linear impulsive neutral stochastic evolution equations with infinite delays in distribution in a real separa... In this work,we investigate the existence and asymptotic stability in mean square of mild solutions for non-linear impulsive neutral stochastic evolution equations with infinite delays in distribution in a real separable Hilbert space.By using the Banach fixed point principle,some sufficient conditions are derived to ensure the asymptotic stability of mild solutions.Moreover,we investigate the Hyers-Ulam stability for such stochastic system.Finally,an illustrative example is given to demonstrate the effectiveness of the obtained results. 展开更多
关键词 asymptotic stability stochastic evolution equations fractional Brownian motion impulse infinite delay
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