Brenner, "Adaptive feedforward control for gust load
alleviation," Journal of Guidance, Control, and Dynamics, vol.
They pointed out that the requirement of gust load
alleviation factor in MIL-S-8698 is a little conservative.
The impact of flexibility on the gust load
factor is also highlighted, comparing it with the quasi-static analysis by Pratt's formula, current standard for Part 23 aircraft.
The objective of the present paper is to derive a unique controller, robust in the presence of model uncertainties due to weight and flight condition variations and able to guarantee a stable aeroelastic response with gust load
A subsequent inquiry into the BOAC crash found the probable cause of the disaster was that "the aircraft suddenly encountered abnormally severe turbulence which imposed a gust load
considerably in excess of the design limit." David Learmount, operations and safety editor of Flight International magazine, said: "An event like this is the kind the aviation world hoped it would not see again, because it involves a world-class carrier flying the latest generation of airliner, and it occurred en route, not during take-off or landing in difficult weather." Until now, no Airbus A330 passenger flight had resulted in fatalities.
In the FFAST ("Future Fast Aeroelastic Simulation Technologies") project, modeling and optimization methods were studied to predict the worst-case gust load
in fast and efficient manner .
Certification requirements specify the discrete gust load
cases considering the aircraft in level flight subject to symmetrical vertical gusts with a "1-cosine" velocity profile, having gust gradient H (half of the gust wavelength) and asking for several gust gradients between 30 ft and 350 ft to be investigated in order to determine the critical conditions .
When a gust load
attacks from lower side of the wing (e.g., a case of high [alpha]), in typical conventional rigid wings, a sudden increase of lift forces will occur.
The study, 'Effect of High Crosswind Gust Loads
on Driver-Vehicle Handling Control', was part of the 39-year-old's Master's programme in mechanical engineering.
He subsequently worked on the determination of aerodynamic gust loads
on aircraft wings before opting for a change of career to offshore mechanics, where he devised and patented combined air/water flotation systems for enhancing the performance of floating offshore platforms.