Results 91 to 100 of about 3,568 (253)
Summary of investigations of engine response to distorted inlet conditions [PDF]
A survey is presented of experimental and analytical experience of the NASA Lewis Research Center in engine response to inlet temperature and pressure distortions.
Abdelwahab, M. +3 more
core +1 more source
Data-driven analysis and new findings on the loss of tail rotor effectiveness in helicopter accidents. [PDF]
Sci Rep, 2022 Saleh JH +5 more
europepmc +1 more source
Baseline Assumptions and Future Research Areas for Urban Air Mobility Vehicles [PDF]
NASA is developing Urban Air Mobility (UAM) concepts to (1) create first-generation reference vehicles that can be used for technology, system, and market studies, and (2) hypothesize second-generation UAM aircraft to determine high-payoff technology ...
Antcliff, Kevin +3 more
core +1 more source
Preliminary noise assessment of aircraft with distributed electric propulsion [PDF]
, 2018 Electric and hybrid-electric propulsion technologies in aviation are becoming more attractive for aviation stakeholders not only due to the resulting reduction or elimination of the dependency on oil, whose availability and price are uncertain, but ...
Eurocontrol Experimental Centre +12 more
core +3 more sources
Army/NASA small turboshaft engine digital controls research program [PDF]
The emphasis of a program to conduct digital controls research for small turboshaft engines is on engine test evaluation of advanced control logic using a flexible microprocessor based digital control system designed specifically for research on advanced
Baez, A. N., Sellers, J. F.
core +1 more source
A Quiet Helicopter for Air Taxi Operations [PDF]
NASA is exploring rotorcraft designs for VTOL air taxi operations, also known as urban air mobility (UAM) or on-demand mobility (ODM) applications. Several concept vehicles have been developed, intended to focus and guide NASA research activities in ...
Johnson, Wayne
core +1 more source
EnergiesThis research is devoted to the development of a method for helicopter turboshaft engine energy characteristics control by regulating the free turbine rotor speed and fuel consumption using neural network technologies.
Serhii Vladov +5 more
doaj +1 more source
Experimental study of ceramic coated tip seals for turbojet engines [PDF]
Ceramic gas-path seals were fabricated and successfully operated over 1000 cycles from flight idle to maximum power in a small turboshaft engine. The seals were fabricated by plasma spraying zirconia over a NiCoCrAlX bond boat on the Haynes 25 substrate.
Biesiadny, T. J. +5 more
core +1 more source
Surface fatigue microcracks in turbocompressor blades of a turboshaft engine
Applied and Computational MechanicsRescue and military helicopters are sometimes exposed to extraordinary operating conditions. Such loading can cause non-standard fatigue defects with very specific types of failure.
Pavlas J., Růžička M., Slavík S.
doaj +1 more source
Design description of a microprocessor based Engine Monitoring and Control unit (EMAC) for small turboshaft [PDF]
Research programs have demonstrated that digital electronic controls are more suitable for advanced aircraft/rotorcraft turbine engine systems than hydromechanical controls.
Baez, A. N.
core +1 more source