An Elastic Element
With a Pair Of Symmetrical
Cross-Flexures
Marija Samardžić
Dušan Ćurčić
Dragan Marinkovski
Elastic element of the forced oscillation apparatus for dynamic
measurements in the T-38 wind tunnel is described. The elastic
element supports large aerodynamic load and enables oscillatory
motion of a model during dynamic wind tunnel experiments. Design of
the elastic element is a very complex process due to the restricted
available space within the model. The elastic element of the T-38
oscillation apparatus is formed from a pair of symmetrical
cross-flexures. Two types of the cross-flexures are presented:
cross-flexure with uniform cross-section of the strips and
cross-flexure with variable cross-section of the strips. Stress
analysis of the cross-flexures showed that strips with variable
cross-section much better matched strict requirements of the dynamic
wind tunnel experiments.
Key words: flexure pivot, cross-flexures, oscillations, wind
tunnel test, stability derivatives.
