Technical Note: Preliminary Slung Load Investigation on the NRC Bell 412 Advanced Systems Research Aircraft

2001 ◽  
Vol 46 (2) ◽  
pp. 161-165 ◽  
Author(s):  
Arthur W. Gubbels
Keyword(s):  
Technical Note ◽  
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.

scholarly journals Rotor systems research aircraft airplane configuration flight-test results

1984 ◽  
Author(s):  
W. PAINTER ◽  
R. ERICKSON
Keyword(s):  
Flight Test ◽  
Test Results ◽  
Rotor Systems ◽  
Systems Research ◽  
Research Aircraft

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.

The rotor systems research aircraft - A flying wind tunnel

1974 ◽  
Author(s):  
A. LINDEN ◽  
M. HELLYAR
Keyword(s):  
Wind Tunnel ◽  
Rotor Systems ◽  
Systems Research ◽  
Research Aircraft

The NRC Bell 412 Advanced Systems Research aircraft - A new facility for airborne simulation

2001 ◽  
Author(s):  
D. Ellis ◽  
Arthur Gubbels ◽  
Stephan Carignan
Keyword(s):  
Systems Research ◽  
Research Aircraft ◽  
New Facility

scholarly journals Helicopter handling qualities: A study in pilot control compensation

2021 ◽  
pp. 1-35
Author(s):  
W.A. Memon ◽  
M.D. White ◽  
G.D. Padfield ◽  
N. Cameron ◽  
L. Lu
Keyword(s):  
Frequency Domain ◽  
Rating Scale ◽  
National Research Council ◽  
Subjective Assessment ◽  
Control Activity ◽  
Handling Qualities ◽  
Systems Research ◽  
Wide Range ◽  
Time Varying Frequency ◽  
Research Aircraft

Abstract The research reported in this paper is aimed at the development of a metric to quantify and predict the extent of pilot control compensation required to fly a wide range of mission task elements. To do this, the utility of a range of time- and frequency-domain measures to examine pilot control activity whilst flying hover/low-speed and forward flight tasks are explored. The tasks were performed by two test pilots using both the National Research Council (Canada)’s Bell 412 Advanced Systems Research Aircraft and the University of Liverpool’s HELIFLIGHT-R simulator. Handling qualities ratings were awarded for each of the tasks and compared with a newly developed weighted adaptive control compensation metric based on discrete pilot inputs, showing good correlation. Moreover, in combination with a time-varying frequency-domain exposure, the proposed metric is shown to be useful for understanding the relationship between the pilot’s subjective assessment, measured control activity and task performance. By collating the results from the subjective and objective metrics for a range of different mission task elements, compensation boundaries are proposed to predict and verify the subjective assessments from the Cooper-Harper Handling Qualities Rating scale.

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
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