A model for flowinduced vibrations
Abstract
The selfexcited oscillations of a bluff body in a fluid flow are described by a mathematical model. The excitation is generated by alternating periodic vortex shedding from the sides of the bluff body. The essential phenomenon observed was the occurrence of 'soft' and 'hard' vibration excitation which provides the explanation for the hysteresis in the vibration amplitude. The starting point of the mathematical treatment is a twoequation model that assumes nonlinear aerodynamic damping. The limits of the model are discussed along with possible improvements.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 January 1975
 Bibcode:
 1975STIN...7520673L
 Keywords:

 Bluff Bodies;
 Fluid Flow;
 Forced Vibration;
 Mathematical Models;
 Cylindrical Bodies;
 Differential Equations;
 Flow Velocity;
 Hysteresis;
 Self Induced Vibration;
 Vortices;
 Fluid Mechanics and Heat Transfer