Elimination of over-predicted heave and pitch motions of catamarans at resonance frequency. (3rd June 2022)

• Record Type: Journal Article
• Authors: Sun, Shi-Li; Cui, Jin; Ge, Shen-Wei; Zou, Jian; Zhou, Wen
• Is Part Of: Ships and offshore structures. Volume 17:Number 6(2022)
• Page Start: 1332
• Page End: 1344
• Publication Date: 2022-06-03
• Subjects: Gap resonance -- critical damping -- viscous damping -- catamaran; Ships -- Periodicals; Offshore structures -- Periodicals; Marine engineering -- Periodicals; Marine engineering -- Technological innovations -- Periodicals; Ocean engineering -- Periodicals; Ocean engineering -- Technological innovations -- Periodicals; 623.8
• DOI: 10.1080/17445302.2021.1912474
• Languages: English
• ISSNs: 1744-5302

Abstract

ABSTRACT: For the special ship like catamaran, which has a unique structure with gap resonance, the traditional potential method tends to over-predict the motion at the resonance frequency due to the negligence of fluid viscosity. In this paper, a new method considering damping is put forward to inhibit over-predicted heave and pitch response. Viscous damping is introduced into free surface boundary conditions. Critical damping is added in the motion equations. Numerical simulations of a HEU catamaran and a DUT catamaran are performed. It is found both viscous damping and critical damping can weaken the over-predicted resonant responses. However, the method of adding critical damping is much more efficient at high speeds and the results conform better to the experimental results.