Results 271 to 280 of about 3,387,018 (354)

Vortex induced helicopter blade loads and noise

Journal of Sound and Vibration, 1973
The fluctuating lift on a helicopter rotor blade passing close to a tip vortex shed from a preceding blade may generate an intense cyclic banging noise, called blade slap, which is one of the most offensive of all helicopter noises. Such blade/vortex interactions are modeled by a finite aspect ratio wing flying at uniform speed over a carpet of equally
L. T. Filotas
semanticscholar   +2 more sources

Experimental investigation of single blade loads by captive model tests in pure oblique flow. Part II: Propeller in-plane loads and preliminary comparison of single blade loads during transient phases

, 2021
Off–design and realistic operative conditions of the propulsion system have been progressively considered a frontier topic for the development of novel and successful design procedures.
F. Ortolani, G. Tani, M. Viviani, G. Dubbioso   +3 more
semanticscholar   +1 more source

Monitoring blade loads for a floating wind turbine in wave basin model tests using Fiber Bragg Grating sensors: A feasibility study

, 2020
The blade loading contains sufficient information about the unsteady aerodynamics of Floating Wind Turbines (FWTs), and it serves as the basis for advanced controller developments.
Binrong Wen, Xinliang Tian, Zhihao Jiang, Zhanwei Li, Xingjian Dong, Zhike Peng   +5 more
semanticscholar   +1 more source

Propeller performance on a model ship in straight and steady drift motions from single blade loads and flow field measurements

, 2020
In the field of marine hydrodynamics, propeller operations in off-design conditions represent a challenging topic that has been increasingly attracting interest among industry and research institutions. Over the ship operating life, off-design conditions
F. Ortolani, A. Capone, G. Dubbioso, F. Pereira, A. Maiocchi, F. Felice   +5 more
semanticscholar   +1 more source

Analysis of fretting inception for marine propeller by single blade loads measurement in realistic operating conditions. Straight ahead and turning circle maneuver

, 2020
Controllable pitch propeller ( C P P ) is a versatile solution to fulfill high hydrodynamic efficiency and low environmental emissions for different operative scenario of a seagoing vessel because it allows the most suitable matching between the prime ...
G. Dubbioso, F. Ortolani
semanticscholar   +1 more source

Experimental investigation of single blade loads by captive model tests in pure oblique flow

, 2020
Maneuvering motion is a critical off-design condition experienced by the propeller during realistic operations. Failures of the propulsive system, loss of efficiency and modification of the propeller side effects (propeller-hull induced pressure and ...
F. Ortolani, M. Viviani, G. Tani, G. Dubbioso   +3 more
semanticscholar   +1 more source

Fluidic Load Control for Wind Turbine Blades

47th AIAA Aerospace Sciences Meeting including The New Horizons Forum and Aerospace Exposition, 2009
This paper describes the initial steps into the investigation of the possibility of reducing fatigue loads on wind turbine blades by the application of fluidic jets. This investigation involves static pressure measurements as well as numerical simulations for a non-rotating NACA-0018 airfoil.
Boeije, C.S., de Vries, H., Cleine, I., van Emden, E., Zwart, G.G.M., Stobbe, H., Hirschberg, A., Hoeijmakers, H.W.M.   +7 more
openaire   +3 more sources

Multivariable robust blade pitch control design to reject periodic loads on wind turbines

, 2020
The demand on sustainable operations of large-scale wind turbines necessitates the concurrent advancement of power regulation and load mitigation through blade pitch control.
Yuan Yuan, Xu Chen, Jiong Tang
semanticscholar   +1 more source

Laryngoscopes: Evaluation of microbial load of blades

American Journal of Infection Control, 2016
Laryngoscope blades were analyzed, and the presence of blood, bodily fluids, and microorganisms was verified, indicating their potential as a source of cross contamination during clinical usage. The way in which the blades are cleaned and disinfected in daily practice may place the patient and health care team at risk.
Ana Claudia, Negri de Sousa, Vanessa Aparecida, Vilas Boas, Carlos Emilio, Levy, Maria Isabel, Pedreira de Freitas   +3 more
openaire   +2 more sources

Assessment of Comprehensive Analysis Predictions of Helicopter Rotor Blade Loads in Forward Flight

Proceedings of the Vertical Flight Society 72nd Annual Forum, 2016
Comparisons of helicopter rotor blade loads, between rotorcraft comprehensive analysis predictions using a free vortex wake model and measured data, are provided for the UH-60A, SA 330 (research Puma), SA 349/2, and H-34 rotors in forward flight.
J. Ho, Nbsp, H. Yeo
semanticscholar   +1 more source