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Fig. 9.1 Collars diagram ()

Fig. 9.2 Schematic representation of aeroelasticity

The body of a biological flier is semi-elastic in nature. During the flight, they

are subjected to inertial, aerodynamic and elastic forces. The wing motion may also

include translation, rotation, oscillation, twist, flapping or a combination of some

of these modes. The study of Structural Dynamics includes the interaction between

structural forces and inertial forces. This study also involves motion and related

stresses in static and dynamic conditions. Considering a rigid solid body moving

in a fluid medium or a fluid flows over a rigid body, the relative motion results in

aerodynamic forces. It also includes frictional and viscous forces by the virtue of

mass, inertia, velocity and acceleration effects. Hence, all these studies come under

the purview of Flight Dynamics.

Static Aeroelasticity deals with the interaction between the structural forces in

terms of stress, strain and elasticity effects with the aerodynamic and viscous forces.

Dynamic Aeroelasticity on the other hand includes the following aspects:

1.

Simultaneous interaction among the inertial and related forces of the body.