The Galloping Instability Analysis of an Inclined Cable
Date Issued
2009
Date
2009
Author(s)
Tsai, Min-Yi
Abstract
This article is focused on the formulation of a general quasi-steady approach for evaluating the critical wind velocity of cable galloping instability. First, three kinds of cable galloping are introduced, along with two methods for predicting the critical wind velocity of cable galloping instability including the Glauert-Den Hartog criterion and an approximate equation for cable galloping (Saito et al., 1990). Second, a simple cable model with the elastic and geometric stiffness matrices modified by the equivalent modulus of elasticity is used along with a general quasi-steady approach for considering the wind forces. For the self-excited force, i.e., the galloping force, the state-space method is used to solve the eigenvalue problem. Third, the results obtained from the present method are compared with Saito’s approximation for some real examples. Finally, a parametric analysis is conducted to find out the key parameter dominating the cable galloping stability.
Subjects
approximate equation for cable galloping ；general quasi-steady approach；self-excited force
Type
thesis
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