Aeroelastic Model Test on Cable Dome of Geiger Type

Abstract

Preliminary results of an aeroelastic wind tunnel test on cable dome of Geiger type are presented in this paper. The structural design of the model is given out in details. Similarity requirement based on dimensional analysis is discussed including Froude number, Cauchy number and Scruton number, for etc. The required structural tests on aeroelastic model are conducted. Dynamic instability subject to harmonic excitation like SDOF hardening system is verified. Both odd and even frequency components are excited when the shaking table dowels at 29Hz. For the one-degree-of-freedom Duffing model, even frequency components will be impossible due to the symmetry of the motion equation if symmetry-breaking bifurcation behaviors do not occur. Ambient modal test shows the aeroelastic damping is significant. Some statistical results of wind tunnel tests are presented. Possibility of aeroelasic instability of cable dome is discussed.