The NRC Bell 412 Advanced Systems Research Aircraft - Facility description and results of safety system flight tests

2000 ◽  
Author(s):  
Arthur Gubbels ◽  
Stephan Carignan ◽  
D. Ellis
Keyword(s):  
Safety System ◽  
Flight Tests ◽  
Systems Research ◽  
Research Aircraft

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.

Relationships between flying qualities and flight tests parameters for the F/A-18 aircraft

2007 ◽  
Vol 111 (1118) ◽  
pp. 281-282
Author(s):  
R. M. Botez ◽  
M. Rotaru
Keyword(s):  
Technical Note ◽  
System Research ◽  
Flight Tests ◽  
Flying Qualities ◽  
Research Aircraft ◽  
Mach Numbers

In this Technical Note, is shown that relationships exist between flying qualities levels 1, 2 and 3 and flight conditions expressed in terms of Mach numbers, altitudes and angles-of-attack for the F/A-18 SRA (System Research Aircraft). These relationships are helpful in detecting if derivatives are well calculated for flight tests intermediate conditions.

Initial military flight tests of the X-22A VSTOL research aircraft

1970 ◽  
Vol 7 (2) ◽  
pp. 169-174
Author(s):  
WILLIAM B. RHODES
Keyword(s):  
Flight Tests ◽  
Research Aircraft
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