Results 41 to 50 of about 947 (191)

Control Design for Soft Transition for Landing Preparation of Light Compound-Wing Unmanned Aerial Vehicles Based on Incremental Nonlinear Dynamic Inversion

Applied Sciences, 2023
This paper proposes a soft switching mode for electric vertical takeoff and landing (eVTOL) compound-wing unmanned aerial vehicles (UAVs) to achieve a smooth transition between modes.
Zheng Ye, Yongliang Chen, Pengcheng Cai, Huitao Lyu, Zheng Gong, Jie Wu   +5 more
doaj   +1 more source

A Quantitative Lithium Inventory Framework for Anode‐Free Lithium Metal Batteries

Advanced Energy Materials, EarlyView.
A component‐resolved lithium inventory framework quantitatively tracks Li redistribution across the cell in anode‐free NMC622||Cu pouch cells throughout cycling. Three sequential degradation stages are identified: formation‐driven cathode Li depletion, midlife inactive Li0 accumulation, and late‐stage runaway SEI thickening. The cathode, as the sole Li
Wurigumula Bao, Alex Liu, Thomas S. Marchese, Yuanlong Bill Zheng, Weikang Li, Dhevathi Rajan Rajagopalan Kannan, Vallabha Rao Rikka, Vinay Premnath, Judith Jeevarajan, Ying Shirley Meng   +9 more
wiley   +1 more source

Vertical Takeoff and Landing Vehicle with Increased Cruise Efficiency [PDF]

, 2018
Systems, methods, and devices are provided that combine an advance vehicle configuration, such as an advanced aircraft configuration, with the infusion of electric propulsion, thereby enabling a four times increase in range and endurance while ...
Rothhaar, Paul M., Laws, Christopher T., Johns, Zachary R., Hodges, William T., Moore, Mark D., Langford, William M., Fredericks, William J., Webb, Sandy R., Busan, Ronald C., North, David D.   +9 more
core  

Aerodynamic Optimization Design of Duct Body Structure for Coaxial Rotor Unmanned Aerial Vehicles

International Journal of Aerospace Engineering
With the rapid development of vertical takeoff and landing aircraft, urban air traffic has gradually attracted people’s attention. The lift system is a key technology in the composition of vertical takeoff and landing aircraft systems. Due to its compact
Du Siliang, Zha Yi, Zhao Qijun
doaj   +1 more source

Multirobot Aerial Soft Manipulator for Floating Litter Collection

Advanced Intelligent Systems, EarlyView.
A multirobot aerial manipulator enables autonomous floating litter collection by controlling the shape of a flexible rope equipped with a hook‐based tool. Adaptive rope‐shape planning enhances grasping performance while reducing tension, demonstrating the potential of aerial robots for floating litter removal. Removing floating litter from water bodies
Antonio González‐Morgado, Sander Smits, Guillermo Heredia, Anibal Ollero, Alexandre Krupa, François Chaumette, Fabien Spindler, Antonio Franchi, Chiara Gabellieri   +8 more
wiley   +1 more source

Sliding Mode Control in Aerospace Applications: A Survey

International Journal of Robust and Nonlinear Control, EarlyView.
ABSTRACT Sliding mode control (SMC) enjoys robustness to matched and unmatched (in the case of minimum phase input‐output dynamics) bounded perturbations, and finite time convergence. Second‐order and higher‐order sliding mode control systems (2‐SMC/HOSMC) retain all the advantages of sliding mode control, but in addition can be applied to systems of ...
Yuri Shtessel, Christopher Edwards
wiley   +1 more source

SHAPE OPTIMIZATION OF A FAN DUNCTE FOR A VERTICAL TAKEOFF AND LANDING [PDF]

, 2018
The popularity of ride sharing services and recent improvements in electric car performance and automation have sparked interest in E-VTOL (Electric Vertical Takeoff and Landing) aircraft for personal transportation.
Hua, Jie
core   +1 more source

Rapid Blade Shape Optimization for Contra-Rotating Propellers for eVTOL Aircraft Considering the Aerodynamic Interference

Aerospace, 2023
The rising interest in the evolvability of electric vertical takeoff and landing (eVTOL) promises substantial potential in the field of urban air mobility (UAM).
Nanxuan Qiao, Tielin Ma, Jingcheng Fu, Ligang Zhang, Xiangsheng Wang, Pu Xue   +5 more
doaj   +1 more source

Polymer Electrolyte–Cathode Surface Bonding Suppresses Oxygen Evolution and Cation Mixing in Ni‐Rich Layered Oxides for Lithium Batteries

Small, EarlyView.
Structural stability of NMC is enhanced by introducing strong Ni–Opolymer bonds, such as those in carbonate‐based (PTMC) electrolytes. Strong hybridization between surface Ni and polymer oxygen facilitates oxidation of undercoordinated Ni2+, thereby mitigating Li/Ni mixing and O2 evolution at deep delithiation states.
Liang‐Ting Wu, Daniel Brandell, Bing Joe Hwang, Jyh‐Chiang Jiang   +3 more
wiley   +1 more source

Electric VTOL design exploration and configurations comparison for urban air mobility

Aerospace Research Communications
The development of Urban Air Mobility (UAM) has led to the introduction of various electric vertical takeoff and landing (eVTOL) aircraft configurations, which plays a crucial role in determining performance.
Xue Chen, Xuanyu Yao, Yunkun Man, Yaolong Liu, Yao Zheng   +4 more
doaj   +1 more source