Effect of multiple engine placement on aeroelastic trim and stability of flying wing aircraft

Finite-time fault-tolerant control for flutter of wing

“…Furthermore, based on the trajectory optimization, we ignores the influence of temperature and establish the equation of wing flutter carrying with the propulsion system. Therefore, compared with (Amoozgar, 2013;Mardanpour et al, 2014;Mazidi et al, 2013) previous studies, our research is of great significance. (ii) In order to reveal the negative effect of the conventional control on the stability of aeroelastic system (Cassaro & Battipede, 2015;Huang et al, 2015;Singh, 2015;Wang et al, 2012;Zhang et al, 2013;Zhao, 2009Zhao, , 2011 and consider the influence of faults, time delay, input saturation, time-varying parameter uncertainties and external disturbances, this paper focuses on the design of finite-time H 1 adaptive fault-tolerant controller for flutter of wing with propulsion system.…”

“…The coupling of aerodynamic load and propulsion system will give rise to more serious wing flutter. Flutter instability of elastic systems subjected to non-conservative forces have been studied by many authors (Amoozgar, 2013;Mardanpour, Richards, Nabipour, & Hodges, 2014;Mazidi, Kalantari, & Fazelzadeh, 2013). Amoozgar (2013) investigated the aeroelastic instability of a wing model, which behaves as an orthotropic composite beam with a concentrated mass subjected to the engine thrust; Wagner function is used to model the unsteady aerodynamic loads, while the engine thrust is modeled as a follower force and a concentrated mass is used to model the engine mass.…”

“…Amoozgar (2013) investigated the aeroelastic instability of a wing model, which behaves as an orthotropic composite beam with a concentrated mass subjected to the engine thrust; Wagner function is used to model the unsteady aerodynamic loads, while the engine thrust is modeled as a follower force and a concentrated mass is used to model the engine mass. Mardanpour et al (2014) using the code NATASHA (Nonlinear Aeroelastic Trim And Stability of HALE Aircraft) investigated the effects of multiple engine placement on flutter characteristics of a backswept flying wing. Mazidi et al (2013) presented the aeroelastic response of a wing containing an engine subjected to different types of time-dependent thrust excitations.…”

On the Importance of Nonlinear Aeroelasticity and Energy Efficiency in Design of Flying Wing Aircraft

“…Former study showed that engine placement does not have a significant effect on the lift to drag ratio [24]. However, a noticeable increase in flutter speed is observed when engines are placed forward of the elastic axis.…”

“…The potential increase of performance for this class of aircraft has inspired aeroelasticians to design new generation of aircraft based on a flying wing configuration [3]. Typical aeroelastic instability of these aircraft is body-freedom flutter when the short-period mode of the aircraft couples with the elastic bending-torsion modes [3,[17][18][19][20][21][22][23][24].…”