Sheharyar Malik, Luca Riccobene, Sergio Ricci, Daniele Monti

DOI Number: N/A

Conference number: IFASD-2017-122

This paper presents the numerical and experimental research activity aiming at the implementation of a Buffet Load Mitigation System (BLMS). Motivated by the advantages associated with the multi surface control, movable leading and trailing edges are actively controlled through static output feedback suboptimal controller. Scaled wing model of X-DIA was analyzed numerically for structural, aerodynamic and aeroelastic analysis by using MSC/NASTRAN. State space realization was completed by in-house built aeroelastic software MASSA founded on MATLAB. Deterministic and probabilistic optimization algorithms optimized the suboptimal controller. Levenberg-Marquardt algorithm founded on second order quadratic formulation ousted further candidates for its robustness and efficiency. Hankel singular values (HSV) validated the sensor/actuator configuration on the wing, precedingly configured on the principle of Identical location of Actuator and Sensor (ILAF) law. HSV defined the unified theme in comparative study of the wing. Application of notch filters on the output feedback and uncertainties were incorporated in the model by built-in MATLAB functions. Robustness of the BLMS under uncertainties was experimentally realized by changing sensitivity of accelerometers and incorporating efficiency factor with the output of PID2. Numerical analyses predicted good performance for wind tunnel experiments. Airbrake installed upstream of the wing replicated the buffet loads in the wind tunnel test section. Considerable attenuation was demonstrated for wing first bending and torsion modes by the active control systems. Power spectral estimates and densities and frequency response are presented to highlight the achieved results.

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In Categories: 1.Events, Active Control and Adaptive Structures, IFASD 2017
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