A higher-order nonlinear oscillator model for coupled cross-flow and in-line VIV of a circular cylinder. (4th July 2018)

• Record Type: Journal Article
• Authors: Kang, Zhuang; Zhang, Cheng; Chang, Rui
• Is Part Of: Ships and offshore structures. Volume 13:Number 5(2018)
• Page Start: 488
• Page End: 503
• Publication Date: 2018-07-04
• Subjects: Vortex-induced vibration -- oscillator model -- nonlinear -- higher-order; Ships -- Periodicals; Offshore structures -- Periodicals; Marine engineering -- Periodicals; Marine engineering -- Technological innovations -- Periodicals; Ocean engineering -- Periodicals; Ocean engineering -- Technological innovations -- Periodicals; 623.8
• DOI: 10.1080/17445302.2018.1426431
• Languages: English
• ISSNs: 1744-5302

Abstract

ABSTRACT: In this paper, a higher-order nonlinear oscillator model has been proposed to predict the characteristics of the vortex-induced vibration (VIV) of a cylinder with two degrees of freedom. First, the vibration equations of the cylinder fixed by four symmetric springs were deduced based on the Lagrangian second kind of kinetic equation and the Taylor expansion formula of the binary function. Then, the fluctuating lift and drag were derived by using the discrete point vortex theory. Finally, the coupling model of the VIV was proposed by introducing the modified Van der Pol equation. On this basis, the VIV prediction of the cylinders with different mass ratios and damping ratios was carried out, and the results were compared with the experimental data to verify correctness and universality of the model. Besides, the sensitivity of the parameters in the model was analysed to investigate the predicting characteristics of the model systematically.