Preliminary Static Aeroelastic Analysis of Reusable Launch Vehicle Stability and Control Derivatives

1999 ◽  
Vol 36 (1) ◽  
pp. 67-74 ◽  
Author(s):  
Thomas A. Zeiler ◽  
David McGhee ◽  
Joseph A. Brunty
Keyword(s):  
Launch Vehicle ◽  
Vehicle Stability ◽  
Stability And Control ◽  
Reusable Launch Vehicle ◽  
Aeroelastic Analysis ◽  
Control Derivatives ◽  
And Control

Rotorcraft Lateral-Directional Oscillations: The Anatomy of a Nuisance Mode

2021 ◽  
Author(s):  
Dheeraj Agarwal ◽  
Linghai Lu ◽  
Gareth D. Padfield ◽  
Mark D. White ◽  
Neil Cameron
Keyword(s):  
Simulation Model ◽  
Simulation Models ◽  
Flight Test ◽  
Flight Simulation ◽  
Stability And Control ◽  
Systems Research ◽  
Control Derivatives ◽  
Research Aircraft ◽  
Level Of Understanding ◽  
And Control

High-fidelity rotorcraft flight simulation relies on the availability of a quality flight model that further demands a good level of understanding of the complexities arising from aerodynamic couplings and interference effects. One such example is the difficulty in the prediction of the characteristics of the rotorcraft lateral-directional oscillation (LDO) mode in simulation. Achieving an acceptable level of the damping of this mode is a design challenge requiring simulation models with sufficient fidelity that reveal sources of destabilizing effects. This paper is focused on using System Identification to highlight such fidelity issues using Liverpool's FLIGHTLAB Bell 412 simulation model and in-flight LDO measurements from the bare airframe National Research Council's (Canada) Advanced Systems Research Aircraft. The simulation model was renovated to improve the fidelity of the model. The results show a close match between the identified models and flight test for the LDO mode frequency and damping. Comparison of identified stability and control derivatives with those predicted by the simulation model highlight areas of good and poor fidelity.

European Benchmark on Numerical Prediction of Stability and Control derivatives

2009 ◽  
Author(s):  
Bruno Mialon ◽  
Saloua Ben Khelil ◽  
Andreas Huebner ◽  
Jean-Christophe Jouhaud ◽  
Gilbert Rogé ◽  
...  
Keyword(s):  
Numerical Prediction ◽  
Stability And Control ◽  
Control Derivatives ◽  
And Control

Stability and Computer Simulation of Trailed Implement under Different Operating Conditions

2016 ◽  
Vol 826 ◽  
pp. 61-65
Author(s):  
Nidal H. Abu-Hamdeh
Keyword(s):  
Normal Component ◽  
Slope Angle ◽  
Operating Conditions ◽  
Vehicle Stability ◽  
Road Vehicle ◽  
Sloping Ground ◽  
Stability And Control ◽  
Maximum Value ◽  
And Control ◽  
Drawbar Pull

The mechanics of a trailer system moving up and down sloping ground under different operating conditions was theoretically simulated. A computer program was developed to analyze the system to predict the effect of both the trailer loading weight and the slope angle on the off-road vehicle stability, traction ability, and drawbar loading. The results of this analysis showed that the off-road vehicle becomes unstable when towing a 3750 kg trailer uphill at 28° slope angle. Insufficient traction occurred at slope angles ranging from 15° to 18° corresponding to trailer weight of 3750 to 750 kg. The parallel component of drawbar pull reached a maximum value of (17318) N when the trailer was pushing the off-road vehicle downhill at 30° slope angle. The normal component (normal to the tractive surface) showed similar maximum values for both uphill and downhill motions of the system. The use of computer analysis in this study provided a significant improvement in predicting the effect of different parameters on stability and control of off-road vehicle-trailer combination on sloping ground.Keywords: Stability, Traction, Sloping ground, Drawbar.

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