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Two-stage two-dimensional force allocation strategy for tunnel boring machines based on a region-reconfigurable thrust system 认领 引用
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作者 Zhe ZHENG Kaihao ZHU +7 位作者 Jiaqi HOU Haibo XIE Lijie JIANG Fulong LIN Lianhui JIA Laikuang LIN Huayong YANG Dong HAN 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2026年第6期583-597,I0035-I0042,共15页
Determining the group forces of the thrust system is essential for trajectory control of tunnel boring machines(TBMs).Existing methods for selecting an optimal solution mainly consider the force variance among groups,... Determining the group forces of the thrust system is essential for trajectory control of tunnel boring machines(TBMs).Existing methods for selecting an optimal solution mainly consider the force variance among groups,while ignoring other constraints,such as uneven segment loading and excessive hydraulic shock.In this study,we develop a more comprehensive and robust framework for force allocation.First,a novel region-reconfigurable hydraulic system is designed,which enforces consistency among the forces acting on each segment.Then on this basis,for the ramping-up tunneling stage,quadratic programming(QP)is used to optimize force uniformity across the spatial dimension.Compared to the on-site allocation result,the improvement in force uniformity reaches up to 32.89%.Moreover,to address the hydraulic shock caused by excessive adjustment to the force,hydraulic compliance is introduced and optimized together with force uniformity using the non-dominated sorting genetic algorithm II(NSGA-II),which outperforms weighted QP by 1.25×106 kN2 in uniformity and 2.86 kN2 in compliance.Analyzing performance in the steady tunneling stage,the service life of the components improves significantly.To avoid a non-existent solution for the thrust force vector,a genetic algorithm-based error tolerance method is developed.Therefore,all deviation rectification commands can be answered with a minor compromise of up to 3%in the fitting accuracy of the thrust force vector.In summary,this framework enhances the adaptability and robustness of the force allocation strategy,providing a reliable foundation for TBM trajectory control. 展开更多
关键词 Tunnel boring machine(TBM) Thrust system Thrust force vector Force allocation Quadratic programming(QP) Non-dominated sorting genetic algorithm II(NSGA-II)
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Motion control of thrust system for shield tunneling machine 认领 引用 被引量：12
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作者 杨华勇 施虎 龚国芳 《Journal of Central South University》 SCIE EI CAS 2010年第3期537-543,共7页
The thrust hydraulic system of the prototype shield machine with pressure and flow compound control scheme was introduced. The experimental system integrated with proportional valves for study was designed. Dynamics m... The thrust hydraulic system of the prototype shield machine with pressure and flow compound control scheme was introduced. The experimental system integrated with proportional valves for study was designed. Dynamics modeling of multi-cylinder thrust system and synchronous control design were accomplished. The simulation of the synchronization motion control system was completed in AMESim and Matlab/Simulink software environments. The experiment was conducted by means of master/slave PID with dead band compensating flow and conventional PID regulating pressure. The experimental results show that the proposed thrust hydraulic system and its control strategy can meet the requirements of tunneling in motion and posture control for the shield machine, keeping the non-synchronous error within ±3 mm. 展开更多
关键词 shield machine thrust system synchronous motion co-simulation PID control
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Dating long thrust systems on Mercury:New clues on the thermal evolution of the planet 认领 引用
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作者 L.Giacomini M.Massironi +2 位作者 V.Galluzzi S.Ferrari P.Palumbo 《Geoscience Frontiers》 SCIE CAS CSCD 2020年第3期855-870,共16页
The global tectonics of Mercury is dominated by contractional features mainly represented by lobate scarps,high relief ridges,and wrinkle ridges.These structures are the expression of thrust faults and are linear or a... The global tectonics of Mercury is dominated by contractional features mainly represented by lobate scarps,high relief ridges,and wrinkle ridges.These structures are the expression of thrust faults and are linear or arcuate features widely distributed on Mercury.Locally,these structures are arranged in long systems characterized by a preferential orientation and non-random spatial distribution.In this work we identified five thrust systems,generally longer than 1000 km.They were named after the main structure or crater encompassed by the system as:Thakur,Victoria,Villa Lobos,Al-Hamadhani,and Enterprise.In order to gain clues about their formation,we dated them using the buffered crater counting technique,which can be applied to derive the ages of linear landforms such as faults,ridges and channels.To estimate the absolute age for the end of the thrust system's activity,we applied both Le Feuvre and Wieczorek Production Function and Neukum Production Functions.Moreover,to further confirm the results obtained with the buffered crater counting method,the classic stratigraphic approach has been adopted,in which a faulted and an unfaulted craters were dated for each system.The results gave consistent ages and suggested that the most movements along major structures all over Mercury most likely ended at about 3.6-3.8 Ga.This gives new clues to better understand the tectonics of the planet and,therefore,its thermal evolution.Indeed,the early occurrence of tectonic activity in the planet's history,well before than predicted by the thermophysical models,coupled with the orientation and spatial distribution of the thrust systems,suggests that other processes beside global contraction,like mantle downwelling or tidal despinning,could have contributed to the first stage of the planet's history. 展开更多
关键词 Mercury Thrust systems Crater counting Thermal evolution Planetary geology Structural geology
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Late Cenozoic Deformation Sequence of a Thrust System along the Eastern Margin of Pamir,Northwest China 认领 引用 被引量：3
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作者 WANG Zhe WANG Xin 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2016年第5期1664-1678,共15页
A thrust belt formed in the basin along the eastern margin of Pamir.The thrust belt is about 50 km wide,extends about 200 km,and includes three compressive structures from south to north：the blind Qipan structural we... A thrust belt formed in the basin along the eastern margin of Pamir.The thrust belt is about 50 km wide,extends about 200 km,and includes three compressive structures from south to north：the blind Qipan structural wedge and Qimugen structural wedge,and the exposed Yengisar anticline.The thrust belt displays a right-stepping en echelon pattern.The Qipan structural wedge dies out northward to the west of the Qimugen structural wedge,and the Qimugen structural wedge dies out northward to the west of the Yengisar anticline.Detailed analysis of seismic reflection profiles of the western Tarim Basin reveal that fan-shaped growth strata were deposited in the shallow part of the thrust belt,recording the deformation sequence of the thrust belt.The depth of the Cenozoic growth strata decreases from south to north.The growth strata of the Qipan structural wedge is located in the middle-lower section of the Pliocene Artux Formation（N2a）,the growth strata of the Qimugen structural wedge is close to the bottom of the Pleistocene Xiyu Formation（Q1x）,and the growth strata of the Yengisar anticline is located in the middle section of the Xiyu Formation（Q1x）.Combined with magnetostratigraphic studies in the western Tarim basin,it can be preliminarily inferred that the deformation sequence of the thrust belt along the eastern margin of Pamir is progressively younger northward.The geometry and kinematic evolution of the thrust belt in the eastern margin of Pamir can be compared with previous analogue modeling experiments of transpressional deformation,suggesting that the thrust belt was formed in a transpressional tectonic setting. 展开更多
关键词 Pamir Tarim thrust belt growth Strata deformation sequence
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The San Juan Islands Thrust System: New Perspectives from LIDAR and Sonar Imagery 认领 引用
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作者 Don J. Easterbrook 《Journal of Earth Science and Engineering》 2015年第1期1-26,共26页
New LIDAR （Light Detection and Ranging） and sonar imagery have revealed remarkable geomorphic details never seen before and not visible by any other means. Numerous faults and other geologic structures are plainly v... New LIDAR （Light Detection and Ranging） and sonar imagery have revealed remarkable geomorphic details never seen before and not visible by any other means. Numerous faults and other geologic structures are plainly visible on LIDAR and sonar images. Many previously unknown faults criss-cross the islands and large fault scarps are visible on sonar imagery along the margins of the larger islands. Sonar images of sea floor morphology show many submerged faults as long linear scarps with relief up to 300m （1,000 fl）, some of which visibly truncate geologic structures. The San Juan Lopez fault, the largest fault in the islands, extends for at least 65 km （40 mi） from Stuart Island to Rosario strait with a scarp up to 330m （1,000 it） high. Since 1975, the basic structural framework of the San Juan Islands has been considered to consist of five stacked thrust faults, the Rosario, Orcas, Haro, Lopez, and Buck Bay faults, constituting the San Juan Thrust （Nappe） System that has shuffled together far distant terranes. However, the new LIDAR and sonar imagery shows that most of the mapped extent of these postulated faults are actually segments of high angle, dipslip faults and are not thrust faults at all. Thus, the San Juan Thrust （Nappe） System does not exist. The age of these faults is not accurately known and more than one period of high angle faulting may have occurred. Faults shown on L1DAR images of the surface of the islands appear as visible gashes, etched out by erosion of fault zones with few fault scarps. However, the sea floor faults have bold relief and high scarps. A late Pleistocene moraine lies undisturbed across the San Juan Lopez fault. 展开更多
关键词 San Juan Thrust System San Juan Islands LIDAR sonar faults.
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Deformation Patterns and Shortening Rates in the East Part of the Kalpin Thrust System in the Southwest Tianshan Mountains During the Late Quaternary 认领 引用
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作者 Ran Yongkang Yang Xiaoping Xu Xiwei Cheng Jianwu Chen Lichun 《Earthquake Research in China》 2007年第2期163-178,共16页
Deformation patterns, shortening amounts and rates in the late Quaternary across the Kalpin thrust system have received tittle attention in the past. This paper attempts to discuss them, mainly in the eastern part of ... Deformation patterns, shortening amounts and rates in the late Quaternary across the Kalpin thrust system have received tittle attention in the past. This paper attempts to discuss them, mainly in the eastern part of the thrust system by doing field investigation along the faults and folds, measuring geomorphic deformation, excavating trenches in several important sites where young alluvial fans were obviously displaced and dating young deposits of alluvial terraces. There are two types of deformation in the surface and near surface for the Kalpin thrust system in the late Quaternary. They are movement of thrust faults on lower angles and bending of young folds. Both kinds of deformation are shown by shortening and uplifting of young geomorphic surfaces. The surface ages of 3 stages are calculated by dating 20 examples using the TL method in the study area and comparing the results of our predecessors on the deposition and incision times of alluvial terraces in the Tianshan mountain which are 100ka B. P., 33 - 18ka B.P. and 6.6 - 8.2ka B.P. respectively for the large-scale deformed alluvial surfaces： T3, T2 and T1 in the Kalpin region. Then, 19 sets of shortening amounts and rates are obtained in 13 sites along 4 rows of anticlines in front of the Kalpin thrust system and Piqiang fold. The shortening amounts and rates show that there are two sections where deformation is stronger than others. The two sections consist of two arcs that are towards the south. The shortening rates near the top of arcs are 1.32mm/a in the west and 1.39mm/a in the east across the thrust system, respectively. In addition, deformation is stronger in the front rows than the rear ones for bifurcate folds. 展开更多
关键词 Kalpin thrust system Deformation pattern Shortening rates Late Quaternary
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Structural Characteristics of Sainan Imbricated Thrust System in the North-Fringe Block-Faulting Belt of Qaidam Basin 认领 引用
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作者 张守仁 曹代勇 +1 位作者 戴俊生 杨文光 《International Journal of Mining Science and Technology》 CAS 1999年第2期136-139,共4页
Sainan imbricated thrust system is a kind of typical nappe structure. Using the method of plot excess area, this paper calculates the detachment depth of this thrust system. The calculating result shows that the detac... Sainan imbricated thrust system is a kind of typical nappe structure. Using the method of plot excess area, this paper calculates the detachment depth of this thrust system. The calculating result shows that the detachment depth is about 15 km underground and tbe shorteuiug of the strata is much more than 700 m. Analysis of fault growth indexs and seismic reflection profiles reveals that this thrust system is developed by the mixing propagation, from piggyback propagation to overstep propagation. 展开更多
关键词 sainan imbricated thrust system detachment depth mixing propagation
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Novel electromagnetic control method of propulsion performance and discharge oscillations in a wall-less Hall thruster 认领 引用
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作者 Yifei LI Weizong WANG +4 位作者 Weiyi KONG Peiran LI Wei LIU Guangchuan ZHANG Haibin TANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第3期175-189,共15页
The rapidly developing microsatellites have put forward new requirements of small volume and low power for propulsion systems.The Wall-Less Hall Thruster(WLHT)is proposed as a promising method to help the Hall thruste... The rapidly developing microsatellites have put forward new requirements of small volume and low power for propulsion systems.The Wall-Less Hall Thruster(WLHT)is proposed as a promising method to help the Hall thruster overcome the issues of wall loss and erosion when applied in microsatellites.However,the in-orbit application of WLHTs is hindered by two key issues:large beam divergence and discharge oscillations,which require further research on effective control.In this paper,a novel electromagnetic-controlled wall-less Hall thruster was developed and tested to regulate the propulsion performance including beam divergence angle,and anode oscillations.Experiments show that adjusting the coil current makes it possible to achieve high thrust performance with low anode current oscillations.According to thermalized potential theory,the performance is improved mainly due to changes in the magnetic field near the anode.At the anode voltage of 300 V and volume flow rate of 6 sccm(standard cubic centimeters per minute)using xenon gas as propellant,the electromagnetic control can increase the thrust by 10.4%(5.79 mN vs 6.39 mN)and the anode efficiency by 2.6 percentage points(19.1%vs 21.7%),and reduce the90%plume half-angle by 14.3%(76.1.to 65.2.).In addition,the production of magnetic field via current-carrying coil can suppress the amplitude of anode current oscillations almost without reducing the thrust performance.The breathing oscillation amplitude of the anode current decreases from 37.2%to 2.6%by adjusting the coil current from+3 A to+4 A,while the thrust only decreases by 0.7%(6.39 mN vs 6.35 mN).This is mainly caused by a sudden change in the direction of the magnetic field near the cathode outlet.The performance of the proposed thruster at the anode power of 200 W is comparable to the state-of-the-art low-power wall-less Hall thrusters. 展开更多
关键词 Anode current oscillations Divergence angle Electromagnetic control Thrust performance Wall-less Hall thruster
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High-resolution 3D shallow crustal structure of Urumqi foreland thrust tectonic belt,northern Tianshan,based on ambient noise tomography 认领 引用
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作者 Xiang Huang Zhengyang Qiang +1 位作者 Weitao Wang Yuan Yao 《Earthquake Science》 CAS CSCD 2026年第1期86-96,共11页
The Urumqi foreland thrust tectonic belt exhibits complex geological structures and strong seismicity.Imaging its shallow crustal structure is of great significance for understanding its tectonic mechanism and seismog... The Urumqi foreland thrust tectonic belt exhibits complex geological structures and strong seismicity.Imaging its shallow crustal structure is of great significance for understanding its tectonic mechanism and seismogenic environment.We obtained a high-resolution S-wave velocity model of the shallow crust at depths of 0–8 km using ambient noise tomography applied to data from a dense seismic array.Sediments are generally thinner in the southeast and thicker in the northwest,with a maximum thickness of more than 8 km.Variations in the velocity structure near the Xishan,Wanyaogou,and Yamalike faults indicate that their formation was related to differences in the physical properties on either side of the fault.In addition,the faults exhibit thrusting of the low-velocity sides towards the high-velocity sides.In the study area,earthquakes rarely occur at depths of less than 3 km and are mostly concentrated in the high-velocity zone in the southern part.Below 3 km depth,more earthquakes were observed,mainly distributed near faults or in relatively high-velocity areas in the southern part.This suggests that high-velocity structures are more prone to stress accumulation,resulting in earthquakes.At 6–8 km depth,the densely distributed earthquakes in the northwestern part of the Bogda mountains are well-aligned with the northwest-oriented low-velocity zone observed in this study,suggesting that this weak zone likely controls seismicity in this area. 展开更多
关键词 ambient noise tomography shallow crustal structure thrust fault seismicity Urumqi depression
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Geological characteristics and natural gas exploration targets of the Jurassic coal-measure whole petroleum system in Northwest China 认领 引用
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作者 JIA Chengzao ZHANG Junfeng +1 位作者 QI Xuefeng ZHAO Wen 《Petroleum Exploration and Development》 SCIE 2026年第3期575-595,共21页
Coal-measure whole petroleum system is generally featured by dual-source multi-reservoir coupling,coexistence of three dynamic fields controlling hydrocarbon accumulation,and sequential accumulation of deep coal-rock ... Coal-measure whole petroleum system is generally featured by dual-source multi-reservoir coupling,coexistence of three dynamic fields controlling hydrocarbon accumulation,and sequential accumulation of deep coal-rock gas(shale gas),proximal tight sandstone gas(fractured tight gas),distal tight gas/conventional natural gas,and shallow coalbed methane.To reveal the common geological characteristics of coal-measure WPS in the Jurassic coal-bearing basins in Northwest China,this paper analyzes the geological characteristics of coal-measure WPSs in Kuqa Depression of Tarim Basin and Thrust Belt of Southern Junggar Basin,such as structure and hydrocarbon accumulation.It is pointed out that the Jurassic whole petroleum system of coal measures in northwestern China is significantly different from that of the Carboniferous-Permian in North China.Four types of source-reservoir coupling accumulation models are mainly developed in the Jurassic of Northwest China,including structural-type shallow to deep conventional gas outside the source,structural-type deep to ultra-deep tight gas outside the source,near-source/in-source tight gas,and self-generating and self-preserving coal-rock gas.It is indicated that the Jurassic strata in Northwest China belong to the giant continental sedimentary region on the passive continental margin of Neo-Tethys Ocean,including six subsidence zones,and containing coal measures and coal rocks that are consistent in the region but distinct from basin to basin.Thus,this region stands as the largest Mesozoic coal-measure area and a giant natural gas accumulation area in China.Resource assessment demonstrates that the Jurassic coal-measure WPS in Northwest China holds natural gas resources up to 30×1012m3,in which merely 11%has been proved,and coal-rock gas accounts for 17×1012 m3,possessing a tremendous exploration potential.Deep and ultra-deep tight gas and coal-rock gas in Kuqa Depression and Southwestern Depression of Tarim Basin,southern margin of Junggar Basin,northern margin of Qaidam Basin,and Taipei Sag of Turpan-Hami Basin will serve as key natural gas exploration targets in the future. 展开更多
关键词 coal-measure whole petroleum system Jurassic in Northwest China Kuqa Depression Southern Junggar Thrust Belt accumulation model natural gas resource potential exploration targets
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Thrust-vectoring schemes for electric propulsion systems:A review 认领 引用 被引量：3
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作者 Andrei SHUMEIKO Victor TELEKH Sergei RYZHKOV 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2025年第6期179-203,共25页
Thrust-vectoring capability has become a critical feature for propulsion systems as space missions move from static to dynamic.Thrust-vectoring is a well-developed area of rocket engine science.For electric propulsion... Thrust-vectoring capability has become a critical feature for propulsion systems as space missions move from static to dynamic.Thrust-vectoring is a well-developed area of rocket engine science.For electric propulsion,however,it is an evolving field that has taken a new leap forward in recent years.A review and analysis of thrust-vectoring schemes for electric propulsion systems have been conducted.The scope of this review includes thrust-vectoring schemes that can be implemented for electrostatic,electromagnetic,and beam-driven thrusters.A classification of electric propulsion schemes that provide thrust-vectoring capability is developed.More attention is given to schemes implemented in laboratory prototypes and flight models.The final part is devoted to a discussion on the suitability of different electric propulsion systems with thrust-vectoring capability for modern space mission operations.The thrust-vectoring capability of electric propulsion is necessary for inner and outer space satellites,which are at a disadvantage with conventional unidirectional propulsion systems due to their limited maneuverability. 展开更多
关键词 Electric propulsion Spacecraft propulsion Plasma sources Flight control systems Thrust vectoring Thrust vector control
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Yaw stabilization and maneuvering control of tailless flying wing by co-directional fluidic thrust vectoring 认领 引用 被引量：1
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作者 Liu ZHANG Meng HE 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第1期66-77,共12页
Fluidic Thrust Vectoring(FTV)is used for the yaw attitude control of tailless flying wing,which can significantly improve stealth performance,maneuverability and lateral/heading maneuverability.The FTV control scheme ... Fluidic Thrust Vectoring(FTV)is used for the yaw attitude control of tailless flying wing,which can significantly improve stealth performance,maneuverability and lateral/heading maneuverability.The FTV control scheme of co-directional secondary flow was designed based on a 30 kgf thrust turbojet engine,an equivalent rudder deflection control variable of Mass Flow Combination(MFC)was proposed,and a control model was established to form a FTV control system scheme,which was integrated with the flight control system of a 100 kg tailless flying wing with medium aspect ratio to achieve closed-loop control of the yaw attitude based on FTV.The heading stability augmentation and maneuvering control characteristics and time response characteristics of tailless flying wing by FTV were quantitatively studied through virtual flight test in a wind tunnel at a wind speed of 35 m/s.The results show that the control strategy based on MFC achieves bidirectional continuous and stable control of thrust vector angle in a range of±11°,and the thrust vector angle varies monotonically with MFC;the co-directional FTV realizes bidirectional continuous and stable control of the yaw attitude of tailless flying wing,without longitudinal/lateral coupling moment.The increment of the maximum yawing moment coefficient is 0.0029,the maximum yaw rate is 7.55(°)/s,and the response time of the yaw rate of the vectoring nozzle actuated by the secondary flow is about 0.06 s,which satisfies the heading stability augmentation and maneuvering control response requirements of the aircraft with statically unstable heading,and provides new control means for the heading rudderless attitude control of tailless flying wing. 展开更多
关键词 Thrust vectoring Flow control Coanda effect Flying-wing aircraft Flight tests Yaw control
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Optimization of rudder/differential thrust joint control strategy and energy-optimal trajectory for solar-powered UAVs 认领 引用
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作者 Xiaopeng YANG Dongli MA +4 位作者 Yayun YU Liang ZHANG Fudong SUN Feng LI Xinglu XIA 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第3期410-430,共21页
To meet the high energy efficiency requirements of solar-powered Unmanned Aerial Vehicles(UAVs),this paper proposes an optimization design framework for a rudder/differential thrust joint control strategy based on inc... To meet the high energy efficiency requirements of solar-powered Unmanned Aerial Vehicles(UAVs),this paper proposes an optimization design framework for a rudder/differential thrust joint control strategy based on incremental nonlinear dynamic inversion,and this collaborative control strategy is further integrated into top-level trajectory optimization.In this framework,the additional aerodynamic forces and moments caused by the asymmetry of the propeller slipstream are precisely modeled.The results demonstrate that through a rational allocation between rudder control and differential thrust control,the extra flight power caused by horizontal turns can be reduced by 44.5%,and the overall average flight power decreases by 6.2%.In energyoptimal trajectory design,the introduction of differential thrust control contributes to minimizing unfavorable segments in the flight trajectory,resulting in increased solar energy absorption and reduced flight energy consumption.The results indicate that the average net residual power increases by 7.3%.The effectiveness of differential thrust control in enhancing the energy performance of solar-powered UAVs is verified in this research. 展开更多
关键词 Aircraft design optimization Differential thrust control Incremental nonlinear dynamic inversion Solar-powered Unmanned aerial vehicles
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The effects of bio-inspired wing vein morphology on thrust generation in double-clap flapping-wing robots 认领 引用
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作者 Tien Van Truong Quoc-Viet Nguyen +1 位作者 Loan Thi Kim Au Hung-Truyen Luong 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第1期257-276,共20页
Wing design is a critical factor in the aerodynamic performance of flapping-wing(FW)robots.Inspired by the natural wing structures of insects,bats,and birds,we explored how bio-mimetic wing vein morphologies,combined ... Wing design is a critical factor in the aerodynamic performance of flapping-wing(FW)robots.Inspired by the natural wing structures of insects,bats,and birds,we explored how bio-mimetic wing vein morphologies,combined with a bio-inspired double wing clap-and-fling mechanism,affect thrust generation.This study focused on increasing vertical force and payload capacity.Through systematic experimentation with various vein configurations and structural designs,we developed innovative wings optimized for thrust production.Comprehensive tests were conducted to measure aerodynamic forces,power consumption,and wing kinematics across a range of flapping frequencies.Additionally,wings with different aspect ratios,a key factor in wing design,were fabricated and extensively evaluated.The study also examined the role of bio-inspired vein layouts on wing flexibility,a critical component in improving flight efficiency.Our findings demonstrate that the newly developed wing design led to a 20%increase in thrust,achieving up to 30 g-force(gf).This research sheds light on the clap-and-fling effect and establishes a promising framework for bio-inspired wing design,offering significant improvements in both performance and payload capacity for FW robots. 展开更多
关键词 Flapping-wing robots Bio-inspired wing vein patterns Thrust generation Double clap-and-fling Fapping frequency
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A MOGWO-based multi-objective optimal tuning strategy for model predictive direct thrust control architecture in gas turbine engine 认领 引用
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作者 Genchang WANG Xiaofeng LIU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第3期384-409,共26页
In modern gas turbine engine control,Direct Thrust Control(DTC) is an effective method for achieving the desired thrust.Model Predictive Control(MPC) has the characteristics of handling constraints while accomplishing... In modern gas turbine engine control,Direct Thrust Control(DTC) is an effective method for achieving the desired thrust.Model Predictive Control(MPC) has the characteristics of handling constraints while accomplishing command tracking,making it a promising approach for implementing DTC.However,since the performance of DTC is highly sensitive to MPC's tuning parameters,developing an efficient optimization strategy for these parameters becomes imperative.Therefore,a Model Predictive Direct Thrust Control(MP-DTC) architecture is designed,and its asymptotic stability is proven.Additionally,the influence of the tuning parameters on control performance is analyzed.Then,a tuning strategy for MP-DTC architecture is proposed.This strategy combines the objectives of DTC to design a Multi-Objective Optimization(MOO) index function,and uses Multi-Objective Grey Wolf Optimizer(MOGWO) to solve its Pareto front and obtain the tuning parameters.In the Hardware-in-Loop(HIL) experiments,the proposed MPDTC architecture achieves the shortest settling time and smallest overshoot compared to the latest DTC scheme.Its MOGWO-based tuning strategy provides more Pareto-optimal solutions,ensuring optimal selection based on rapidity and stability,and maintains precise DTC even under component degradation and various operating conditions,thereby providing robustness,optimality,and generalizability. 展开更多
关键词 Direct thrust control Model predictive control Multi-objective grey wolf optimizer Multi-objective optimization Tuning parameters
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Compliance of hydraulic system and its applications in thrust system design of shield tunneling machine 认领 引用 被引量：10
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作者 SHI Hu GONG GuoFang +1 位作者 YANG HuaYong MEI XueSong 《Science China(Technological Sciences)》 SCIE EI CAS 2013年第9期2124-2131,共8页
As the most significant performance, compliance of hydraulic system is defined as the capacity to accommodate the sudden change of the external load. Due to the different requirements of the compliant tasks, the exist... As the most significant performance, compliance of hydraulic system is defined as the capacity to accommodate the sudden change of the external load. Due to the different requirements of the compliant tasks, the existing method for mechanical systems cannot be used in the analysis and design of the hydraulic system. In this paper, the definition and expression of compliance of hydraulic system are proposed to evaluate the compliance of the hydraulic system operating under sudden change load. Because the unexpected geological conditions during excavation may exert sudden change load to the shield tunneling machine, the compliance theory has found a right application in the thrust hydraulic system. By analyzing the basic operating principle and the commonly used architectures of the thrust hydraulic system, a compliance based thrust hydraulic system design method is presented. Moreover, a tunneling case is investigated in the paper as an example to expound the validation of design procedure. In conclusion, the compliance of the hydraulic system can be served as an evaluation of the capability in conforming to the load impact, giving supports for the design of the thrust hydraulic system of shield tunneling machines. 展开更多
关键词 compliance hydraulic system load impact thrust system design shield tunneling machine
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Method to avoid the structural interference of the thrust system of a shield tunneling machine 认领 引用 被引量：1
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作者 WANG LinTao SUN Wei +1 位作者 GONG GuoFang YANG HuaYong 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2017年第5期701-712,共12页
Several malfunctions of the shield tunneling machine （STM） caused by structural interference have been encountered in actual tunnel excavation. This paper is focusing on providing an effective method to avoid the st... Several malfunctions of the shield tunneling machine （STM） caused by structural interference have been encountered in actual tunnel excavation. This paper is focusing on providing an effective method to avoid the structural interference based on making the reachable and the required workspaces of the thrust system match each other. The main structure of the thrust mechanism is analyzed, and coordinate systems are built up to describe the pose and workspace of the thrust mechanism. Constraint conditions are derived and the formulation of each constraint condition is carried out to facilitate the analysis of the reachable workspace of the thrust mechanism. Meanwhile, a reachable workspace determination algorithm is introduced based on interval analysis method. The mathematical model for determining the required workspace of the thrust mechanism is presented based on the analysis of the process when the STM excavates along a specific tunnel axis. Two applications are included to show how to avoid these problems by choosing reasonable parameters of the designed tunnel axis and the key structural parameters of the thrust mechanism based on workspace matching. 展开更多
关键词 shield tunneling machine thrust system specific tunnel axis reachable workspace
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Practical compensation for nonlinear dynamic thrust measurement system 认领 引用 被引量：2
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作者 Chen Lin Chen Jie Li Jianxun 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2015年第2期418-426,共9页
The real dynamic thrust measurement system usually tends to be nonlinear due to the complex characteristics of the rig, pipes connection, etc. For a real dynamic measuring system, the nonlinearity must be eliminated b... The real dynamic thrust measurement system usually tends to be nonlinear due to the complex characteristics of the rig, pipes connection, etc. For a real dynamic measuring system, the nonlinearity must be eliminated by some adequate methods. In this paper, a nonlinear model of dynamic thrust measurement system is established by using radial basis function neural network （RBF-NN）, where a novel multi-step force generator is designed to stimulate the nonlinearity of the system, and a practical compensation method for the measurement system using left inverse model is proposed. Left inverse model can be considered as a perfect dynamic compensation of the dynamic thrust measurement system, and in practice, it can be approximated by RBF-NN based on least mean square （LMS） algorithms. Different weights are set for producing the multi-step force, which is the ideal input signal of the nonlinear dynamic thrust measurement system. The validity of the compensation method depends on the engine＇s performance and the tolerance error 0.5%, which is commonly demanded in engineering. Results from simulations and experiments show that the practical compensation using left inverse model based on RBF-NN in dynamic thrust measuring system can yield high tracking accuracy than the conventional methods. 展开更多
关键词 Digital compensation Dynamic thrust measure-ment system Identification Left inverse model Nonlinear model Radial basis function neuralnetwork
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Numerical analysis of the static performance of an annular aerostatic gas thrust bearing applied in the cryogenic turbo-expander of the EAST subsystem 认领 引用 被引量：1
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作者 Tianwei LAI Bao FU +2 位作者 Shuangtao CHEN Qiyong ZHANG Yu HOU 《Plasma Science and Technology》 SCIE EI CAS CSCD 2017年第2期115-122,共8页
The EAST superconducting tokamak, an advanced steady-state plasma physics experimental device, has been built at the Institute of Plasma Physics, Chinese Academy of Sciences. All the toroidal field magnets and poloida... The EAST superconducting tokamak, an advanced steady-state plasma physics experimental device, has been built at the Institute of Plasma Physics, Chinese Academy of Sciences. All the toroidal field magnets and poloidal field magnets, made of NbTi/Cu cable-in-conduit conductor, are cooled with forced flow supercritical helium at 3.8 K. The cryogenic system of EAST consists of a 2 kW/4 K helium refrigerator and a helium distribution system for the cooling of coils, structures, thermal shields, bus-lines, etc. The high-speed turbo-expander is an important refrigerating component of the EAST cryogenic system. In the turbo-expander, the axial supporting technology is critical for the smooth operation of the rotor bearing system. In this paper, hydrostatic thrust bearings are designed based on the axial load of the turbo-expander. Thereafter, a computational fluid dynamics-based numerical model of the aerostatic thrust bearing is set up to evaluate the bearing performance. Tilting effect on the pressure distribution and bearing load is analyzed for the thrust beating. Bearing load and stiffness are compared with different static supply pressures. The net force from the thrust bearings can be calculated for different combinations of bearing clearance and supply pressure. 展开更多
关键词 EAST helium cryogenic system aerostatic thrust beating inclination bearing load
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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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