Results 1 to 10 of about 32,293 (191)

Three-dimensional formation flying using bifurcating potential fields [PDF]

, 2009
This paper describes the design of a three-dimensional formation flying guidance and control algorithm for a swarm of autonomous Unmanned Aerial Vehicles (UAVs), using the new approach of bifurcating artificial potential fields.
Bennet, Derek J., McInnes, Colin R., Suzuki, Masayuki, Uchiyama, Kenji   +3 more
core   +1 more source

Feasibility Study of Short Takeoff and Landing Urban Air Mobility Vehicles Using Geometric Programming [PDF]

, 2018
Electric Short Takeoff and Landing (eSTOL) vehicles are proposed as a path towards implementing an Urban Air Mobility (UAM) network that reduces critical vehicle certification risks and offers advantages in vehicle performance compared to the widely ...
Antcliff K. R., ASTM, Borer N. K., Burton M., County, Deere K. A., Drela M., Drela M., Federal Aviation Administration, Harish A., Howard C. E., Justin C. Y., Kokam, Kreimeier M., Kurtz D. W., Mass GIS, McCormick B. W., National Aeronautics and Space Administration, Patterson M. D., Perry D., Raymer D. P., Roe M. H., Seeley B. A., Siegel D., Stoll A. M., Stoll A. M., Uber, Vascik P. D., Warren Hoburg P. K.   +28 more
core   +1 more source

Experimental Investigation of the Mechanical Behavior of the Strain Isolation Pad in Thermal Protection Systems under Tension

Aerospace
A strain isolation pad is a critical connection mechanism that enables deformation coordination between the rigid thermal insulation tile and the primary structure in the thermal protection system of a reusable hypersonic vehicle.
Maoxu Lu, Zhenqiang Wu, Ziqing Hao, Liu Liu   +3 more
doaj   +1 more source

Secrecy Performance of a Non-Orthogonal Multiple Access-Based Space–Air–Ground Integrated Network System with Stochastic Geometry Distribution of Terrestrial Terminals and Fog Absorption in Optical Link

Aerospace
Recently, non-orthogonal multiple access (NOMA)-based space–air–ground integrated networks (SAGINs) have gained increasing attention due to their robust communication, broader coverage, and resource-saving advantages.
Xuhui Wang, Jinyu He, Guanjun Xu, Jiajia Chen, Yuhan Gao   +4 more
doaj   +1 more source

Monoethanolamine-Based Fuels Hypergolic with Rocket-Grade Hydrogen Peroxide

Aerospace
The object of this work is to study the ignition performances of promising catalytically promoted amino-based green fuels to be used in combination with rocket-grade hydrogen peroxide.
Luca Caffiero, Stefania Carlotti, Filippo Maggi   +2 more
doaj   +1 more source

A novel dual-stator hybrid excited synchronous wind generator [PDF]

, 2009
This paper presents a novel dual-stator hybrid excited synchronous wind generator and describes its structural features and operation principle. The no-load magnetic fields with different field currents are computed by 3-D finite-element method.
Chengfeng, Y., Heyun, L., Jian, G., Shuhua, F., Xiping, L., Zhu, Z.Q.   +5 more
core   +1 more source

Wind Tunnel Investigation of Transient Propeller Loads for Non-Axial Inflow Conditions

Aerospace
Recent developments in electrical Vertical Take-off and Landing (eVTOL) vehicles show the need for a better understanding of transient aero-mechanical propeller loads for non-axial inflow conditions.
Catharina Moreira, Nikolai Herzog, Christian Breitsamter   +2 more
doaj   +1 more source

A Review of Novel Heat Transfer Materials and Fluids for Aerospace Applications

Aerospace
The issue of thermal control for space missions has been critical since the early space missions in the late 1950s. The demands in such environments are heightened, characterized by significant temperature variations and the need to manage substantial ...
Glauco Nobrega, Beatriz Cardoso, Reinaldo Souza, José Pereira, Pedro Pontes, Susana O. Catarino, Diana Pinho, Rui Lima, Ana Moita   +8 more
doaj   +1 more source

Self‐Maintained Thermal Charging Cells for the Efficient Harvesting of Waste Heat at Elevated Temperatures

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
Thermal charging cells (TCS) face two main challenges that limit their practical applications: 1) Still lacking the systems suitable for operation under higher temperature environments, and 2) there are limitations in the self‐sustaining performance of continuous discharge under temperature differences, which holds critical significance for the real ...
Tingting Meng, Yimin Xuan, Yunjie Xiong
wiley   +1 more source

Analysis of Wave Propagation with Different Magnetic Configurations in Helicon Plasmas

Aerospace
A two-dimensional plasma–wave interaction model, which is based on the cold collisional plasma dielectric tensor, is applied to investigate the wave propagation and power depositions under different magnetic configurations in helicon plasmas.
Bin Tian, Kan Xie, Bingchen An, Jing Wang, Su-Lan Yang, Yong Cao   +5 more
doaj   +1 more source