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Showing 1 to 9 of 9 for “"airwake"”.
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Contributions to Ship-Airwake-Rotor Coupling Characterization Using Controlled Forcing
… encompassing the coupled effects of the ship airwake, rotor wake, flight dynamics, and pilot response. A central aspect of the DI is the aerodynamic interaction between the ship airwake and the rotor wake, which degrades handling qualities and increases pilot workload, yet the underlying …
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A Study of Ship Airwakes Using Dual Plane Stereoscopic PIV
<p>The airwake of a model Simple Frigate Shape 2 (SFS2) was studied in a low-speed wind tunnel. This airwake was measured using a novel time-dependent, dual plane, stereoscopic particle image velocimetry approach. Two flow planes over the flight deck, one parallel and one perpendicular to the …
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Analysis of Ship Airwakes Using Modal Decomposition
<p>The three-dimensional, unsteady, and turbulent airwake produced by a scaled model of a generic Navy ship (Simple Frigate Shape No. 2) was investigated in a low-speed wind tunnel. Stereoscopic, time-resolved particle image velocimetry (TR-PIV) measurements were made at six different crosswise …
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Time-Resolved PIV Measurements of Ship Airwakes with Quartering Winds
<p>The unsteady, three-dimensional, turbulent airwake over the Simple Frigate Ship No. 2 (SFS2) with quartering wind flow directions was studied in a low-speed wind tunnel facility. Surface oil flow visualization and time-resolved stereoscopic and planar particle image velocimetry (PIV) …
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Estimation and Mapping of Ship Air Wakes using RC Helicopters as a Sensing Platform
… wireless in-situ measurement and mapping of ship airwake. The presented instrumentation system utilizes an RC helicopter as a carrier platform and uses the helicopter's dynamics for spatial 3D mapping of wind turbulence. The system was tested with a YP676 naval training craft to map ship airwake …
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Contributions to the Understanding of Ship Airwakes Using Advanced Flow Diagnostic Techniques
… of a ship, which is referred to as an airwake. This problem is relevant and important because the turbulent airwake significantly and adversely affects the ability for rotorcraft to operate safely from the decks of Navy ships. To this end, a series of wind tunnel measurements were …
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Constrained Control for Helicopter Shipboard Operations and Moored Ocean Current Turbine Flight Control
… dynamics, the ship dynamics, and the ship airwake interactions. Various airwake models such as Control Equivalent Turbulence Inputs (CETI) model and Computation Fluid Dynamics (CFD) data of the airwake are incorporated in the interface to describe a realistic model of the shipborne …
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Dual Solver Computational Modeling of Ship-Helicopter Dynamic Interface Aeromechanics
… aerodynamic interactions between the ship airwake and the helicopter aerodynamics, known as the dynamic interface (DI). As such, detailed analysis and testing must be done to establish the range of safe conditions at which these maneuvers can be performed, as well as to train pilots to …
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Active and Passive Flow Control over the Flight Deck of Small Naval Vessels
Helicopter operations in the vicinity of small naval surface vessels often require excessive pilot workload. Because of the unsteady flow field and large mean velocity gradients, the envelope for flight operations is limited. This experimental investigation uses a 1:144 scale model of the U.S. Navy …