Aircraft lateral parameter estimation from flight data with unsteady aerodynamic modelling

Unsteady aerodynamic modelling for aircraft lateral parameter estimation

“…It is argued in the present paper that such a model of Ref. 4 is inherently inconsistent and, therefore a more plausible model consistent with the vortex system assumed, is proposed. The proposed model accounts for lag-in-sidewash effects and is in a suitable form for use in equations of motion to be used for parameter estimation.…”

“…Due to non-availability of real flight data, an aeroplane similar to Navion (Table 1) and used in Ref. 4 was considered for generating simulated flight data and sidewash angle. As mentioned earlier, the matching of sidewash angle as calculated from Equations (4) and (5) was good as shown in Fig.…”

“…contribution to rolling and yawing moment coefficients from vertical tail sideforce coefficient of vertical tail indicial sideforce coefficient parameter defined in Equation (9) to model time-lag-in-sidewash effect functions defined by Equation (Ai, A2) in Appendix A acceleration due to gravity, m/s 2 coefficients used in modelling indicial sidewash angle, Equation (5) moment of inertia about X and Z axis respectively, kg m 2 V^T vertical tail length, m For over a decade now, research efforts have been directed at modelling of unsteady aerodynamic effects into the aircraft equations of motion for the purpose of parameter estimation. Queijo et a/' 1 ' suggested a simplified aerodynamic force model using Weissinger's vortex system to replace the wing; this basic model has been used for including unsteady aerodynamics into longitudinal dynamics' 2,3 > and lateral dynamics' 4 '. The model proposed in Ref.…”

“…The model proposed in Ref. 4 is based on an analogy with the downwash in longitudinal flight. It is argued in the present paper that such a model of Ref.…”