Results 11 to 20 of about 27,038 (175)

Low-Thrust Solid Rocket Motors for Small, Fast Aircraft Propulsion: Design and Development [PDF]

open access: yes, 2021
Small, low-thrust, long-burn-time solid propellant rocket motors could provide propulsion for a new class of kilogram-scale, transonic, uncrewed aerial vehicles (UAVs).
Hansman Jr, Robert J   +2 more
core   +1 more source

Modeling Framework for Identification and Analysis of Key Metrics for Trajectory Energy Management of Electric Aircraft [PDF]

open access: yes, 2021
Presented at AIAA AVIATION Forum, August 2-6, 2021, VIRTUAL EVENTTo prepare for the upcoming entry into service of electric and hybrid-electric aircraft, regulators may have to update or develop new regulations and standards to ensure safe operations of ...
Beedie, Seumas M.   +4 more
core   +1 more source

A Disc-Type High Speed Rotary Ultrasonic Motor with Internal Contact Teeth [PDF]

open access: yes, 2021
This paper presents a disc-type ultrasonic piezoelectric motor, which is designed for micro flying vehicles. It provides a high output rotation speed under low operating voltage, compared with common piezoelectric devices, by employing a “contact teeth ...
Borodinas, Sergejus   +11 more
core   +1 more source

Optimized Energy Management Schemes for Electric Vehicle Applications: A Bibliometric Analysis towards Future Trends [PDF]

open access: yes, 2021
Concerns over growing greenhouse gas (GHG) emissions and fuel prices have prompted researchers to look into alternative energy sources, notably in the transportation sector, accounting for more than 70% of carbon emissions.

core   +1 more source

Slow-Burn Ammonium Perchlorate Propellants with Oxamide: Burn Rate Model, Testing, and Applications [PDF]

open access: yes, 2020
Low-thrust long-burn-time solid rocket motors may be useful as propulsion for small, fast, uncrewed aerial vehicles. These motors require a slow-burning propellant that can operate at unusually low chamber pressures (0.3–2 MPa).
Hansman Jr, Robert J   +2 more
core   +1 more source

The development of a multidimensional scale to evaluate motor vehicle dynamic qualities. [PDF]

open access: yes, 2005
Advances in motor vehicle engineering will allow greater refinement of the dynamic qualities of passenger cars in the near future. This paper describes the development and initial validation of a reliable and valid multidimensional scale to assess these ...
Harris, Don   +5 more
core   +1 more source

Accurate Tracking of Aggressive Quadrotor Trajectories Using Incremental Nonlinear Dynamic Inversion and Differential Flatness [PDF]

open access: yes, 2021
IEEE Autonomous unmanned aerial vehicles (UAVs) that can execute aggressive (\ie, high-speed and high-acceleration) maneuvers have attracted significant attention in the past few years.
Tal, Ezra, Karaman, Sertac
core   +1 more source

Integrated Design of Solid Rocket Powered Vehicles Including Exhaust Plume Radiant Emission [PDF]

open access: yes, 2023
For aircraft and rockets where vehicle visibility is a concern, exhaust plume radiant emission is an important aspect of solid rocket powered vehicle performance.
Mathesius, Kelly J.
core  

Multidisciplinary design optimization for hybrid electric vehicles: component sizing and multi-fidelity frontal crashworthiness [PDF]

open access: yes, 2020
The electrification of road vehicle powertrains has recently gained growing interest worldwide as an effective solution to comply tightening regulations on CO2 emissions.
Anselma, P. G   +5 more
core   +1 more source

Design optimization of double ring rotary type ultrasonic motor [PDF]

open access: yes, 2019
This paper describes the design, optimization and experimental results of piezoelectric motor that uses the radial mode of excitation of the double rings stator.
Borodinas, Sergejus   +4 more
core   +1 more source

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