In wind tunnel testing, which test studies the aerodynamic characteristics of a specific mode using a rigid model with spring support?

• A. Two-Dimensional Test of Rigid Model with Spring Support
• B. Three-Dimensional Global Model Test
• C. Full-Scale Wind Tunnel Test
• D. One-Dimensional Beam Test

Answer: (A)

Isolating a single aeroelastic mode in wind tunnel testing by using a rigid model on spring supports. The spring-mounted rigid model provides a defined restoring force and limited damping, so the structure can move primarily in the chosen degree of freedom (for example, a plunge or pitch in a two-dimensional cross-section). This setup lets you measure how the aerodynamics respond to that specific mode—lift, drag, pitching moment, and stability characteristics—without the complicating effects of bending or other modes, since the model itself remains rigid. The two-dimensional nature focuses the study on the cross-sectional behavior relevant to the selected mode, rather than full three-dimensional flow effects. This approach is commonly used to examine mode-specific aeroelastic characteristics, such as the conditions for flutter or dynamic stability.