Simply implementing non-rational function gust filters for real time simulation applications

Incorporation of SemiSpan SuperSonic Transport (S4T) Aeroservoelastic Models into SAREC-ASV Simulation

“…The Mask also interrogates the simulation to determine the fixed-step sample rate, and discretizes the model using a Tustin bilinear transformation. The third turbulence model uses a discrete convolution representation that is able to match a non-rational slope for the high frequency roll-off of the power spectrum 7 . A flag is used to choose either a clock-generated seed for the random number generator, or zero as the seed in order to have a repeatable check case.…”

“…Two turbulence models were implemented as 2 nd and 3 rd order discrete state space models and the third model was implemented as a discrete convolution 7 , with a (half second) impulse function time history to characterize the frequency content.…”

“…Turbulence models were designed to be representative of the TDT wind-tunnel environment. 7 A key role for the simulation was to provide a means for verifying that control-law sign conventions, units and channel assignments were consistent with the actual wind-tunnel model. Additionally, the simulation provided an indication of whether actuator rate and position limits would be exceeded, closed-loop, in the presence of turbulence.…”