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AN APPLICATION OF A NUMERICAL TECHNIQUE TO LIFTING-SURFACE THEORY FOR CALCULATION OF UNSTEADY AERODYNAMIC FORCES DUE TO CONTINUOUS SINUSOIDAL GUSTS ON SEVERAL WING PLANFORMS AT SUBSONIC SPEEDS
Numerical lifting-surface method to calculate direct gust forces and moments on wings at subsonic speeds
Effects of gust-induced and maneuvering acceleration stress on pilot-vehicle performance.
Gust induced and maneuvering acceleration stress effect on pilot-vehicle performance during extended periods of low level high speed flight
The Ames wind-tunnel gust generator
Gust load generator for high Reynolds number wind tunnel
A wind-tunnel technique for measuring frequency-response functions for gust load analyses.
Wind tunnel technique for measuring frequency response of flexible airplane to vertical sinusoidal gusts
Gust Simulation in a Wind Tunnel
Air injection nozzles for gust simulation in wind tunnel
Launch booster gust alleviation.
Design of gust alleviation controls for boost phase flight of missiles incorporating random winds, time-varying missile dynamics, control problem, etc
A wind-tunnel technique for measuring frequency-response functions for gust load analyses.
Wind tunnel technique for measuring frequency response of flexible airplane to vertical sinusoidal gusts
Launch booster gust alleviation.
Controller design for booster gust alleviation, considering stochastic minimization problem solved by iteration yielding linear finite time controller with time-varying gains
Initial results of a flight investigation of the wing and tail loads on an airplane equipped with a vane-controlled gust-alleviation system
Results are given of an analysis of wing and horizontal-tail spar strains measured on a twin-engine light transport airplane which was modified for the installation of a control system to alleviate airplane motions in turbulent air and thus improve passenger comfort. From a sample of the measurements obtained in flight through clear-air turbulence, normal acceleration at the airplane center of gravity was reduced 43 percent, wing main-spar bending strains were reduced, and wing-spar shear strains were increased. Horizontal-tail shear and bending strains were increased. Measurements of aerodynamic loads obtained in a pull-up with the gust-alleviation system in operation are also presented.
Characterization of Oscillatory Response of Light-Weight Wind Turbine Rotors under Controlled Gust Pulses
Given the industry-wide trend of continual increases in the size of utility-scale wind turbines, a point will come where reductions will need to be made in terms of the weight of the turbine’s blades to ensure they can be as long as needed without sacrificing structural stability. One such technique that may be considered is to decrease the material used for the shell and spar cap. While this will solve the weight issue, it creates a new one entirely—less material for the shell and spar cap will in turn create blades that are more flexible than what is currently used. This article aims to investigate how the oscillatory response of light-weight wind turbine rotors is affected by these flexibility changes. The object of our study is the Sandia National Lab National Rotor Testbed (SNL-NRT) wind turbine, which the authors investigated in the course of a research project supported by SNL. Using a reduced-order characterization (ROC) technique based on controlled gust pulses, introduced by the authors in a previous work, the aeroelastic dynamics of the NRT’s original baseline blade design and several of its flexible variations were studied via numerical simulations employing the CODEF multiphysics suite. Results for this characterization are presented and analyzed, including a generalization of the ROC of the SNL-NRT oscillatory dynamics to larger machines with geometrical similarity. The latter will prove to be valuable in terms of extrapolating results from the present investigation and other ongoing studies to the scale of current and future commercial machines.
Effects of gust-induced and maneuvering acceleration stress on pilot-vehicle performance
Piloted motion simulator study of gust induced and maneuvering acceleration stress on pilot performance in low level mission
Analog study of the longitudinal response of a swept-wing transport airplane to wind shear and sustained gusts during landing approach
Analog computed time histories and altitude-ground track plots of swept wing transport aircraft longitudinal response to wind shear and sustained gusts during landing approaches
Wind and gust design criteria for the Martian atmosphere
Wind and gust criteria for Martian atmosphere in relation to spacecraft design and mission planning
Wind and gust design criteria for the Martian atmosphere.
Martian atmospheric wind and gust criteria for design of vehicles and mission
Structural dynamic stability augmentation and gust alleviation of flexible aircraft.
Flexible aircraft response reduction to atmospheric turbulence, noting structural dynamic stability augmentation and gust alleviation
Attached flow gust penetration loads
Attached flow gust loads of slender bodies moving supersonic speeds
The pulsed air gust generator Final report
Wind tunnel simulation of jet pulsing apparatus for controlled gusts