Hiroki Oyama

Flutter Characteristics of an Over-the-Wing Engine Mount Business-Jet Configuration

Mounting engines on the wing causes complex wing flutter characteristics. The location of the engine mass and the stiffness of the pylon relative to the wing are important in preventing hazardous wing flutter. In addition, if the nacelles are installed over the wing, aerodynamic interference between the wing and the nacelle may cause unfavorable flutter characteristics, in particular, at transonic speeds. The flutter characteristics of an over-the-wing engine mount configuration obtained from theoretical analyses and low speed and transonic wind tunnel tests, are presented. Nomenclature c wing local chord b wing semi-chord at 75% wing span D di ssipation function g structural damping gi structural damping for ith mode k reduced frequency