Journal ArticleDOI
Simulation of Atmospheric Turbulent Gusts and Gust Gradients
TLDR
In this paper, an improved three-dimensional, nonrecursive model for atmospheric turbulence has been developed that provides for simulation of both instantaneous gusts and gust gradients along the flight path of the Space Shuttle.Abstract:
An improved three-dimensional, nonrecursive model for atmospheric turbulence has been developed that provides for simulation of both instantaneous gusts and gust gradients along the flight path of the Space Shuttle. The one-dimensional gust and gust gradient spectral models, which form the basis for the simulation scheme, are developed from three-dimensional, von Karman spectra, integrated over finite limits based on the characteristic dimensions (length, width, and thickness) of the flight vehicle. By means of the simulation process, nondimensional time series for both gusts and gust gradients have been generated and stored on a series of magnetic tapes for four altitude bands ranging from 0 to 10,000 m. These Shuttle Simulation Turbulence Tapes (SSTT) have been validated by means of spectral and statistical analyses with very satisfactory results. The dimensionless form of the time series, coupled with the use of a von Karman spectral model (as opposed to a Dryden model), distinguish the SSTT from earlier turbulence simulation concepts.read more
Citations
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Proceedings ArticleDOI
Creating a Unified Graphical Wind Turbulence Model from Multiple Specifications
TL;DR: This paper documents the research for and development of the unified wind turbulence model block for a Commercial Off-the-Shelf (COTS) software package that allows for a graphical hierarchical block diagram representation of entire vehicles including environment and control models.
Book ChapterDOI
Numerical methods and mathematical aspects for simulation of homogeneous and non homogeneous gaussian vector fields
Fabrice Poirion,Christian Soize +1 more
TL;DR: In this paper, the authors present a method of numerical simulation of random gaussian fields, with values in a vector space, homogeneous and non homogeneous, and give a thorough description with some addenda for the general case of vector valued random fields.
Proceedings ArticleDOI
Constrained-control of a quadrotor helicopter for trajectory tracking under wind-gust disturbances
TL;DR: In this article, a constrained finite time optimal controller (CFTOC) is proposed for the problem of trajectory tracking of an Unmanned Quadrotor Helicopter (UqH) using piecewise modeling of the quadrotor for the rotational angles, that are inherently coupled to the translation equations of motion.
Book ChapterDOI
Nonlinear flight control techniques for unmanned aerial vehicles
TL;DR: An overview of some tools and techniques used for designing nonlinear flight controllers for UAVs, including gain scheduling, model predictive control, backstepping, dynamic inversion based control, model reference adaptive control, and model based fault tolerant control are presented.
Journal ArticleDOI
A spatial model of wind shear and turbulence
C. W. Campbell,V. A. Sanborn +1 more
TL;DR: In this paper, a 3D auto-spectral information and correlation is used to generate the wind environment for use by others for flight simulation, and the resulting simulated wind is a nonlinear, non-Gaussian combination of real atmospheric winds and Gaussian, three-dimensional turbulence modulated by gust intensities which may vary freely as desired over space.
References
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Book
Dynamics of Atmospheric Flight
TL;DR: In this article, the dynamics of atmospheric flight, with special reference to the stability and control of airplanes, are discussed. But the authors focus on human pilots and handling qualities and flight in turbulence, with numerical examples for a jet transport.
ReportDOI
Background Information and User Guide for Mil-F-8785B (ASG), 'Military Specification-Flying Qualities of Piloted Airplanes'
TL;DR: The primary purpose is to explain the concept and philosophy underlying MIL-F-8785B and to present some of the data and arguments upon which the requirements were based, and to define their significance and relationship to each other.
Journal ArticleDOI
Turbulent Wind and Its Effect on Flight
TL;DR: In this paper, the authors defined the components of (W-WA) in FB or FA = components of Wm in FA and FE = velocity of airplane mass center relative to Earth relative to FA.
Theory of the flight of airplanes in isotropic turbulence - review and extension
TL;DR: In this article, it is suggested that the assumptions of homogeneity and isotropy customarily adopted for high altitude are still useful in this regime, and that the integral scale is roughly equal to 9/10 of the altitude up to about 1000 ft.