Provides a GUI for wind speed settings and implements a continuous-gusts model. The settings are wind direction, speed and turbulence magnitude.
Forum Thread: http://forum.kerbalspaceprogram.com/threads/107989
Source Code: https://github.com/DaMichel/KerbalWind
Required: Ferram Aerospace Research
Optional: Toolbar
DaMichel, silverfox8124
It is a partial implementation of random processes described by the Dryden model. From frame to frame, new random perturbations of the wind velocity vector are computed. This noise exhibits approximate power spectral densities as specified by the Dryden model. There are different densities for longitudinal and transversal directions.
This is implemented by generating white Gaussian noises which are input to infinite impulse response filters generating the desired signals. As a result, subsequent signal values are correlated according to the model. The strength of the correlation depends on the distance that the craft traveled during one frame. Care has been taken to make it work for any finite distance, including zero.
When I wrote 'distance' I actually meant the distance traveled relative to the baseline wind velocity w. This is because the perturbations are assumed to "move" with the velocity w. Otherwise, they are frozen in time. Hence, they are formally described by a random vector field (u_g, v_g, w_g) depending on the craft position p and velocity v by (u_g, v_g, w_g)(p + t * (v - w)). An interesting consequence is that if the craft velocity (ground speed) exactly matches the wind velocity, the craft will not experience any turbulence at all. For planes, this is a reasonable simplification because this state won't last for very long in any case. ;-)
The filter for u_g was designed by taking the Z-transform of
the filter response and matching its Taylor expansion for
small frequencies with a suitable square root of the desired
power spectral density. Spectral densities for v_g and w_g
(lateral components) are only approximated so that I could
build a stable filter from superposition and chaining
of lower order filters used also for u_g. See maple worksheet
in misc/
A severe limitation is the neglect of spatial variations of the wind velocity around the craft. All parts of the craft experience the same wind. This means for instance, that roll inducing forces due to uneven lift are not accounted for. I hope to correct this eventually.
DaMichel started off with some code from KerbalWeatherSystem courtesy of SilverFox8124 for which I want to thank him. Also much thanks goes to Ippo343 for writing the FAR patch that lets you add wind, and Ferram4 for making FAR and accepting all those patches.
The code is subject to the MIT license (see below). In addition, the creators of derivative work must give credit to silverfox8124 and DaMichel.
Copyright (c) 2015 DaMichel, silverfox8124
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