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ISO 1151-9

1st Edition, September 15, 1993

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Flight Dynamics - Concepts, Quantities and Symbols - Part 9: Models of Atmospheric Motions Along the Trajectory of the Aircraft

Includes all amendments and changes through Amendment 1, October 1, 1998

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This pari of ISO 1151 deals with the concepts and quantities characterizing models of the air motions affecting the dynamic behaviour of the aircraft.

The aircraft motion is only influenced by the wind velocity field in the space surrounding the aircraft trajectory (8.2.1) and by its variations with time. In flight dynamic problems, it is usual to represent this field and its variations with time by considering mathematic models, which are schematic representations of the real wind.

In this part of ISO 1151, the following models are defined:

— constant wind (9.1);

— wind gradients (9.2);

— discrete gusts (9.3);

— three-dimensional wind models (9.4);

— vortices (9.5);

— continuous turbulence (9.6).

In these models it is assumed that the air motions are not perturbed by the presence of the aircraft itself. Other models can be defined by superposition of these models."
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