The health management of batteries is a key enabler for the adoption of Electric Vertical Take-off and Landingvehicles (eVTOLs). Currently, few studies consider the health management of eVTOL batteries. One distinctch...The health management of batteries is a key enabler for the adoption of Electric Vertical Take-off and Landingvehicles (eVTOLs). Currently, few studies consider the health management of eVTOL batteries. One distinctcharacteristic of batteries for eVTOLs is that the discharge rates are significantly larger during take-off andlanding, compared with the battery discharge rates needed for automotives. Such discharge protocols areexpected to impact the long-run health of batteries. This paper proposes a data-driven machine learningframework to estimate the state-of-health and remaining-useful-lifetime of eVTOL batteries under varying flightconditions and taking into account the entire flight profile of the eVTOLs. Three main features are consideredfor the assessment of the health of the batteries: charge, discharge and temperature. The importance of thesefeatures is also quantified. Considering battery charging before flight, a selection of missions for state-ofhealth and remaining-useful-lifetime prediction is performed. The results show that indeed, discharge-relatedfeatures have the highest importance when predicting battery state-of-health and remaining-useful-lifetime.Using several machine learning algorithms, it is shown that the battery state-of-health and remaining-useful-lifeare well estimated using Random Forest regression and Extreme Gradient Boosting, respectively.展开更多
In this paper.Active Disturbance Rejection Control(ADRC)is utilized in the pitch control of a vertical take-off and landing fixed-wing Unmanned Aerial Vehicle(UAV)to address the problem of height fluctuation during th...In this paper.Active Disturbance Rejection Control(ADRC)is utilized in the pitch control of a vertical take-off and landing fixed-wing Unmanned Aerial Vehicle(UAV)to address the problem of height fluctuation during the transition from hover to level flight.Considering the difficulty of parameter tuning of ADRC as well as the requirement of accuracy and rapidity of the controller,a Multi-Strategy Pigeon-Inspired Optimization(MSPIO)algorithm is employed.Particle Swarm Optimization(PSO),Genetic Algorithm(GA),the basic Pigeon-Inspired Optimization(PIO),and an improved PIO algorithm CMPIO are compared.In addition,the optimized ADRC control system is compared with the pure Proportional-Integral-Derivative(PID)control system and the non-optimized ADRC control system.The effectiveness of the designed control strategy for forward transition is verified and the faster convergence speed and better exploitation ability of the proposed MSPIO algorithm are confirmed by simulation results.展开更多
This paper presents a new stabilizing control law for a planar vertical take-off and landing aircraft.The model is first transformed into an equivalent form,and then a control law consisting of a linear term and a sat...This paper presents a new stabilizing control law for a planar vertical take-off and landing aircraft.The model is first transformed into an equivalent form,and then a control law consisting of a linear term and a saturated term is given for a related subsystem,with the saturation levels being assigned as large as possible.Compared to the existing saturation scheme in which all states are restricted by saturations,the design brings about a relatively fast convergence.The effectiveness and advantage of the design are validated by numerical simulations.展开更多
为提升我国两栖攻击舰远程攻击能力,对国外舰机适配性进行分析。分析国外短距/垂直起降飞机(short/vertical takeoff and landing,SVTOL)的技术现状,从舰船总体设计角度开展舰机适配性分析并提出关键技术,结合美国、日本、意大利的大型...为提升我国两栖攻击舰远程攻击能力,对国外舰机适配性进行分析。分析国外短距/垂直起降飞机(short/vertical takeoff and landing,SVTOL)的技术现状,从舰船总体设计角度开展舰机适配性分析并提出关键技术,结合美国、日本、意大利的大型两栖舰船具体分析舰载机上舰的改装工程。结果表明,该分析可为国内相关领域科研生产提供参考。展开更多
S/VTOL(short/vertical take-off and landing)战斗机用推力矢量喷管是飞机实现短距起飞垂直降落,摆脱对跑道的依赖,减小航母的设计难度,及显著提高飞机机动性能的关键技术,已成为第4代战斗机和战斗机用航空发动机的设计标志。结合不同...S/VTOL(short/vertical take-off and landing)战斗机用推力矢量喷管是飞机实现短距起飞垂直降落,摆脱对跑道的依赖,减小航母的设计难度,及显著提高飞机机动性能的关键技术,已成为第4代战斗机和战斗机用航空发动机的设计标志。结合不同时期推力矢量喷管的特征和不同战斗机对推力矢量的技术要求,对短距起飞垂直降落战斗机用矢量喷管的结构特点、工作原理及发展状况进行了归纳及总结。详细提出了S/VTOL战斗机用推力矢量喷管的关键技术,并对开展S/VTOL战斗机用矢量喷管技术研究提出建议。展开更多
文摘The health management of batteries is a key enabler for the adoption of Electric Vertical Take-off and Landingvehicles (eVTOLs). Currently, few studies consider the health management of eVTOL batteries. One distinctcharacteristic of batteries for eVTOLs is that the discharge rates are significantly larger during take-off andlanding, compared with the battery discharge rates needed for automotives. Such discharge protocols areexpected to impact the long-run health of batteries. This paper proposes a data-driven machine learningframework to estimate the state-of-health and remaining-useful-lifetime of eVTOL batteries under varying flightconditions and taking into account the entire flight profile of the eVTOLs. Three main features are consideredfor the assessment of the health of the batteries: charge, discharge and temperature. The importance of thesefeatures is also quantified. Considering battery charging before flight, a selection of missions for state-ofhealth and remaining-useful-lifetime prediction is performed. The results show that indeed, discharge-relatedfeatures have the highest importance when predicting battery state-of-health and remaining-useful-lifetime.Using several machine learning algorithms, it is shown that the battery state-of-health and remaining-useful-lifeare well estimated using Random Forest regression and Extreme Gradient Boosting, respectively.
基金supported by Science and Technology Innovation 2030-Key Project of"New Generation Artificial Intelli-gence",China(No.2018AAA0100803)National Natural Science Foundation of China(Nos.U20B2071,91948204,U1913602)Aeronautical Foundation of China(No.20185851022).
文摘In this paper.Active Disturbance Rejection Control(ADRC)is utilized in the pitch control of a vertical take-off and landing fixed-wing Unmanned Aerial Vehicle(UAV)to address the problem of height fluctuation during the transition from hover to level flight.Considering the difficulty of parameter tuning of ADRC as well as the requirement of accuracy and rapidity of the controller,a Multi-Strategy Pigeon-Inspired Optimization(MSPIO)algorithm is employed.Particle Swarm Optimization(PSO),Genetic Algorithm(GA),the basic Pigeon-Inspired Optimization(PIO),and an improved PIO algorithm CMPIO are compared.In addition,the optimized ADRC control system is compared with the pure Proportional-Integral-Derivative(PID)control system and the non-optimized ADRC control system.The effectiveness of the designed control strategy for forward transition is verified and the faster convergence speed and better exploitation ability of the proposed MSPIO algorithm are confirmed by simulation results.
基金supported by the National Natural Science Foundation of China (No. 60874008)the Research Fund for the Doctoral Program of High Education of China (No. 200805331102)
文摘This paper presents a new stabilizing control law for a planar vertical take-off and landing aircraft.The model is first transformed into an equivalent form,and then a control law consisting of a linear term and a saturated term is given for a related subsystem,with the saturation levels being assigned as large as possible.Compared to the existing saturation scheme in which all states are restricted by saturations,the design brings about a relatively fast convergence.The effectiveness and advantage of the design are validated by numerical simulations.
文摘为提升我国两栖攻击舰远程攻击能力,对国外舰机适配性进行分析。分析国外短距/垂直起降飞机(short/vertical takeoff and landing,SVTOL)的技术现状,从舰船总体设计角度开展舰机适配性分析并提出关键技术,结合美国、日本、意大利的大型两栖舰船具体分析舰载机上舰的改装工程。结果表明,该分析可为国内相关领域科研生产提供参考。
文摘S/VTOL(short/vertical take-off and landing)战斗机用推力矢量喷管是飞机实现短距起飞垂直降落,摆脱对跑道的依赖,减小航母的设计难度,及显著提高飞机机动性能的关键技术,已成为第4代战斗机和战斗机用航空发动机的设计标志。结合不同时期推力矢量喷管的特征和不同战斗机对推力矢量的技术要求,对短距起飞垂直降落战斗机用矢量喷管的结构特点、工作原理及发展状况进行了归纳及总结。详细提出了S/VTOL战斗机用推力矢量喷管的关键技术,并对开展S/VTOL战斗机用矢量喷管技术研究提出建议。
