The hybrid electric propulsion system(HEPS)holds clear potential to support the goal of sustainability in the automobile and aviation industry.As an important part of the three-dimensional transportation network,vehic...The hybrid electric propulsion system(HEPS)holds clear potential to support the goal of sustainability in the automobile and aviation industry.As an important part of the three-dimensional transportation network,vehicles and aircraft using HEPSs have the advantages of high fuel economy,low emission,and low noise.To fulfill these advantages,the design of their energy management strategies(EMSs)is essential.This paper presents an in-depth review of EMSs for hybrid electric vehicles(HEVs)and hybrid electric aircraft.First,in view of the main challenges of current EMSs of HEVs,the referenced research is reviewed according to the solutions facing real-time implementation problems,variable driving conditions adaptability problems,and multi-objective optimization problems,respectively.Second,the existing research on the EMSs for hybrid electric aircraft is summarized according to the hybrid electric propulsion architectures.In addition,with the advance in propulsion technology and mechanical manufacturing in recent years,flying cars have gradually become a reality,further enriching the composition of the three-dimensional transportation network.And EMSs also play an essential role in the efficient operation of flying cars driven by HEPSs.Therefore,in the last part of this paper,the development status of flying cars and their future prospects are elaborated.By comprehensively summarizing the EMSs of HEPS for vehicles and aircraft,this review aims to provide guidance for the research on the EMSs for flying cars driven by HEPS and serve as the basis for knowledge transfer of relevant researchers.展开更多
The split flying car is composed of a flight module,a passenger capsule and an intelligent chassis module.The autonomous docking between these modules enables the split flying car to switch between flight mode and dri...The split flying car is composed of a flight module,a passenger capsule and an intelligent chassis module.The autonomous docking between these modules enables the split flying car to switch between flight mode and driving mode.The positioning of the aircraft bracket junction point is crucial for determining the desired position of the flight module.However,the complex and variable takeoff and landing environments and the limited computing power of edge computing platforms pose significant challenges to the perception task.To address these issues,we propose a lightweight network-based aircraft bracket detection model that meets real-time requirements in docking scenarios.Firstly,we use the inverse perspective mapping stitched bird's eye view as input to obtain the junction point coordinates of the aircraft bracket through the junction point detector.Then the position information of the bracket is obtained by eliminating the mis-detected junction points and reasoning out the missed junction points based on the a priori information of the aircraft bracket.To facilitate vision-based aircraft bracket detection research,a dataset is established,which is the first publicly available dataset in this research field,collecting 4,631 bird's eye views in different environments.The proposed method can achieve FPS of 35.79 and average precision of 0.915 in the Jetson AGX Xavier edge computing platform.The proposed method can also achieve competitive results when applied in parking slot detection with at least 2×faster inference speed.展开更多
In China,the term“black flights”re-fers to unauthorized operations of drones,flying cars and other aircraft.This includes unregistered devices,as well as registered ones flown without approval or beyond permitted zo...In China,the term“black flights”re-fers to unauthorized operations of drones,flying cars and other aircraft.This includes unregistered devices,as well as registered ones flown without approval or beyond permitted zones.Chinese law stipulates clear penalties for such violations,ranging from warnings and fines to criminal liability in serious cases.Despite these regulations,black flights have grown increasingly common in recent years.展开更多
FLYING CAR DEMO The air module of Chinese electric vehicle maker XPENG’s land-to-air flying car,the Land Aircraft Carrier,conducts a flight demonstration at Liuye Lake Tourist Resort in Changde,Hunan Province,on Marc...FLYING CAR DEMO The air module of Chinese electric vehicle maker XPENG’s land-to-air flying car,the Land Aircraft Carrier,conducts a flight demonstration at Liuye Lake Tourist Resort in Changde,Hunan Province,on March 27.The hybrid vehicle is comprised of an electric ground module and an electric vertical takeoff and landing air module.Following a previous test flight in Shanghai last year,the company has received nearly 5,000 orders for the vehicle.展开更多
This study explores urban air mobility(UAM)as a strategy for mitigating escalating traffic congestion in major urban areas as a consequence of a static transportation supply versus dynamic demand growth.It offers an i...This study explores urban air mobility(UAM)as a strategy for mitigating escalating traffic congestion in major urban areas as a consequence of a static transportation supply versus dynamic demand growth.It offers an indepth overview of UAM development,highlighting its present state and the challenges of integration with established urban transport systems.Key areas of focus include the technological advancements and obstacles in electric vertical take-off and landing(eVTOL)aircrafts,which are essential for UAM operation in urban environments.Furthermore,it explores the infrastructure requirements for UAM,including vertiport deployment and the creation of adept air traffic control(ATC)systems.These developments must be integrated into the urban landscape without exacerbating land-use challenges.This paper also examines the regulatory framework for UAM,including existing aviation regulations and the necessity for novel policies specifically designed for urban aerial transport.This study presents a comprehensive perspective for various stakeholders,from policymakers to urban planners,highlighting the need for a thorough understanding of UAM’s potential and effective assimilation into urban mobility frameworks.展开更多
In this study,we adopt a coupled fluid-rigid body simulation using the moving computational domain method and multi-axis sliding mesh method for the takeoff,hovering,and yawing flight of an electric vertical takeoff a...In this study,we adopt a coupled fluid-rigid body simulation using the moving computational domain method and multi-axis sliding mesh method for the takeoff,hovering,and yawing flight of an electric vertical takeoff and landing aircraft(eVTOL).The aircraft model has four pairs of coaxial propellers,and the computational domain is divided into three domains to move the aircraft and eight propeller domains to rotate the propellers.As a result,we clarify the behavior and aerodynamic force of the aircraft when the input values are determined by the automatic control.The results in the flow field also show that the downwash spreads in a crisscross pattern on the ground,the wind reaches different ranges on the ground depending on the flight altitude,and that the coaxial propeller causes an asymmetry in the velocity field during yawing.Conse-quently,we conclude that this method is effective for the flight simulation of an eVTOL.展开更多
基金This work was supported by the National Natural Science Foundation of China(Grant No.51975048,52102449).
文摘The hybrid electric propulsion system(HEPS)holds clear potential to support the goal of sustainability in the automobile and aviation industry.As an important part of the three-dimensional transportation network,vehicles and aircraft using HEPSs have the advantages of high fuel economy,low emission,and low noise.To fulfill these advantages,the design of their energy management strategies(EMSs)is essential.This paper presents an in-depth review of EMSs for hybrid electric vehicles(HEVs)and hybrid electric aircraft.First,in view of the main challenges of current EMSs of HEVs,the referenced research is reviewed according to the solutions facing real-time implementation problems,variable driving conditions adaptability problems,and multi-objective optimization problems,respectively.Second,the existing research on the EMSs for hybrid electric aircraft is summarized according to the hybrid electric propulsion architectures.In addition,with the advance in propulsion technology and mechanical manufacturing in recent years,flying cars have gradually become a reality,further enriching the composition of the three-dimensional transportation network.And EMSs also play an essential role in the efficient operation of flying cars driven by HEPSs.Therefore,in the last part of this paper,the development status of flying cars and their future prospects are elaborated.By comprehensively summarizing the EMSs of HEPS for vehicles and aircraft,this review aims to provide guidance for the research on the EMSs for flying cars driven by HEPS and serve as the basis for knowledge transfer of relevant researchers.
基金supported in part by the National Natural Science Foundation of China under Grant 52275047,52102449,and 51975048in part by the China Postdoctoral Science Foundation under Grant 2021M690394in part by the Beijing Institute of Technology Research Fund Program for Young Scholars.
文摘The split flying car is composed of a flight module,a passenger capsule and an intelligent chassis module.The autonomous docking between these modules enables the split flying car to switch between flight mode and driving mode.The positioning of the aircraft bracket junction point is crucial for determining the desired position of the flight module.However,the complex and variable takeoff and landing environments and the limited computing power of edge computing platforms pose significant challenges to the perception task.To address these issues,we propose a lightweight network-based aircraft bracket detection model that meets real-time requirements in docking scenarios.Firstly,we use the inverse perspective mapping stitched bird's eye view as input to obtain the junction point coordinates of the aircraft bracket through the junction point detector.Then the position information of the bracket is obtained by eliminating the mis-detected junction points and reasoning out the missed junction points based on the a priori information of the aircraft bracket.To facilitate vision-based aircraft bracket detection research,a dataset is established,which is the first publicly available dataset in this research field,collecting 4,631 bird's eye views in different environments.The proposed method can achieve FPS of 35.79 and average precision of 0.915 in the Jetson AGX Xavier edge computing platform.The proposed method can also achieve competitive results when applied in parking slot detection with at least 2×faster inference speed.
文摘In China,the term“black flights”re-fers to unauthorized operations of drones,flying cars and other aircraft.This includes unregistered devices,as well as registered ones flown without approval or beyond permitted zones.Chinese law stipulates clear penalties for such violations,ranging from warnings and fines to criminal liability in serious cases.Despite these regulations,black flights have grown increasingly common in recent years.
文摘FLYING CAR DEMO The air module of Chinese electric vehicle maker XPENG’s land-to-air flying car,the Land Aircraft Carrier,conducts a flight demonstration at Liuye Lake Tourist Resort in Changde,Hunan Province,on March 27.The hybrid vehicle is comprised of an electric ground module and an electric vertical takeoff and landing air module.Following a previous test flight in Shanghai last year,the company has received nearly 5,000 orders for the vehicle.
基金supported by the National Natural Science Foundation of China(Grant Nos.52220105001,52221005,72322002,72361137001,and 72331001).
文摘This study explores urban air mobility(UAM)as a strategy for mitigating escalating traffic congestion in major urban areas as a consequence of a static transportation supply versus dynamic demand growth.It offers an indepth overview of UAM development,highlighting its present state and the challenges of integration with established urban transport systems.Key areas of focus include the technological advancements and obstacles in electric vertical take-off and landing(eVTOL)aircrafts,which are essential for UAM operation in urban environments.Furthermore,it explores the infrastructure requirements for UAM,including vertiport deployment and the creation of adept air traffic control(ATC)systems.These developments must be integrated into the urban landscape without exacerbating land-use challenges.This paper also examines the regulatory framework for UAM,including existing aviation regulations and the necessity for novel policies specifically designed for urban aerial transport.This study presents a comprehensive perspective for various stakeholders,from policymakers to urban planners,highlighting the need for a thorough understanding of UAM’s potential and effective assimilation into urban mobility frameworks.
基金JKA through its promotion funds from KEIRIN RACE and by JSPS KAKENHI Grant Number 21K03856.
文摘In this study,we adopt a coupled fluid-rigid body simulation using the moving computational domain method and multi-axis sliding mesh method for the takeoff,hovering,and yawing flight of an electric vertical takeoff and landing aircraft(eVTOL).The aircraft model has four pairs of coaxial propellers,and the computational domain is divided into three domains to move the aircraft and eight propeller domains to rotate the propellers.As a result,we clarify the behavior and aerodynamic force of the aircraft when the input values are determined by the automatic control.The results in the flow field also show that the downwash spreads in a crisscross pattern on the ground,the wind reaches different ranges on the ground depending on the flight altitude,and that the coaxial propeller causes an asymmetry in the velocity field during yawing.Conse-quently,we conclude that this method is effective for the flight simulation of an eVTOL.
