Results 281 to 290 of about 1,064,749 (319)

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

Disturbance Rejection Handling Qualities Criteria for Rotorcraft

Proceedings of the Vertical Flight Society 72nd Annual Forum, 2016
Aeronautical Design Standard ADS-33E-PRF is lacking in a viable hover/low-speed, short-term disturbance rejection criteria to design and analyze hold modes.
T. Berger, Christina M. Ivler, Marcos G. Berrios, M. Tischler, Nbsp, D. Miller   +5 more
semanticscholar   +1 more source

System Identification and Controller Optimization of a Quadrotor UAV

Proceedings of the Vertical Flight Society 71st Annual Forum, 2015
Multi-rotor aircraft, such as the quadrotor, are increasingly popular for small-scaled VTOL UAVs. In order to develop an effective control system through simulation techniques, obtaining an accurate dynamic model of a given quadrotor is crucial ...
Wei Wei, Nbsp, Kelly Cohen, M. Tischler, Amrdec   +4 more
semanticscholar   +1 more source

Experimental Evaluation of Multi-rotor UAV Operation under Icing Conditions

Proceedings of the Vertical Flight Society 74th Annual Forum, 2018
Unmanned aerial vehicles (UAV) with multi-rotor configurations have become a popular platform for aerial surveillance and and are forecast for use in delivery of packages. During these missions, UAVs can be exposed to icing conditions.
Sihong Yan, Nbsp, T. Opazo, J. Palacios, J. Langelaan, Louis-David Germain   +5 more
semanticscholar   +1 more source

Perception for Safe Autonomous Helicopter Flight and Landing

Proceedings of the Vertical Flight Society 72nd Annual Forum, 2016
Rotorcraft operating in unprepared locations must be capable of safe flight in the presence of unmapped obstacles and absence of GPS, and must be able to quickly and reliably assess a potential landing zone's suitability for landing.
Sanjiv Singh, Nbsp, Hugh Cover, Adam Stambler, B. Grocholsky, Spencer Spiker, Jeffrey Mishler, Bradley Hamner, K. Strabala, G. Sherwin, M. Bergerman, Near Earth Autonomy, M. Kaess, Garrett Hemann   +13 more
semanticscholar   +1 more source

Overview of S-97 RAIDER Scale Model Tests

Proceedings of the Vertical Flight Society 72nd Annual Forum, 2016
A sequence of scale model wind tunnel tests have been conducted to help design the S-97 RAIDER™ aircraft and better understand the aerodynamics of X2 Technology™ rotorcraft incorporating coaxial rigid lift offset rotors, low drag airframes, and a ...
P. Lorber, G. Law, John O''Neill, Nbsp, Claude G. Matalanis, P. Bowles   +5 more
semanticscholar   +1 more source

Design and Flight Test of a Hybrid External Load Stabilization System for an H-6 Helicopter Testbed

Proceedings of the Vertical Flight Society 71st Annual Forum, 2015
A future helicopter vehicle management system must include technologies to minimize the impact of externally slung loads on the helicopter's controllability.
Byron W. Patterson, R. Enns, C. King, Bryan E. Kashawlic, Stephen Mohammed, George Lukes, Nbsp   +6 more
semanticscholar   +1 more source

Axisymmetric Potential Flow Model of Single or Coaxial Actuator Disks

Proceedings of the Vertical Flight Society 72nd Annual Forum, 2016
This paper presents a computationally efficient method for computing the axisymmetric three-dimensional flow field induced by the trailing vortex system of either a single actuator disk or a pair of closely spaced coaxial actuator disks.
E. Giovanetti, K. Hall, Nbsp
semanticscholar   +1 more source

State of the Art of Helicopter Hybrid Propulsion

Proceedings of the Vertical Flight Society 72nd Annual Forum, 2016
State of the art of Helicopter hybrid Propulsion perspectives is presented. As done in the car industry, it can be envisaged replacing thermal energy necessary for helicopter propulsion and sustentation by electrical energy.
Christian Mercier, M. Gazzino, M. Mugnier, Nbsp   +3 more
semanticscholar   +1 more source

Predictions of Transonic Rotor Noise by KFWH Method with A Permeable Self-Adaptive Integration Surface

Proceedings of the Vertical Flight Society 72nd Annual Forum, 2016
In this paper, a new permeable self-adaptive integration surface is developed for the evaluation of transonic rotor noise by KFWH method. Firstly, the nonlinear near flowfield solution is computed by a N-S solver and as input for acoustic calculations ...
Chen nbsp, Si-yu, Nbsp, Zhao nbsp, Qi-jun, Zhu nbsp, Zheng, Ma nbsp, Yi-Yang   +8 more
semanticscholar   +1 more source