Hydroelastic Oscillations of Smooth and Rough Cylinders in Harmonic Flow.
Abstract
A comprehensive experimental and analytical investigation has been undertaken to determine the hydroelastic response of elastically-mounted smooth and rough cylinders in harmonically-oscillating flow. The forces acting on the cylinder and the cylinder response have been measured together with the characteristics of the flow and analyzed through the use of the Fourier analysis, spectral analysis, Duhamel's integral, and the wake-oscillator model. In addition, the in-line force has been analyzed through the use of Morison's equation. The results have shown that hydroelastic oscillation occur in a narrow range of the reduced velocity and give rise to significant amplification of the exciting force. The use of the Fourier and spectral analysis together with the governing equations of motion was shown to predict the hydroelastic response of the cylinders in the synchronous region. The investigation shed considerable light on the interaction between the harmonic fluid motion and the hydroelastic response of cylinders and provided definitive information for the prediction of the force and response characteristics of the type of oscillations considered herein. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1979
- Accession Number
- ADA081760
Entities
People
- Farhad Rajabi
Organizations
- Naval Postgraduate School