The pitch vulnerability of a typical wave energy converter geometry based on Melnikov and Markov approaches. (14th September 2021)

• Record Type: Journal Article
• Authors: Wang, Hao; Falzarano, Jeffrey
• Is Part Of: Ships and offshore structures. Volume 16:Number 8(2021)
• Page Start: 904
• Page End: 918
• Publication Date: 2021-09-14
• Subjects: Capsizing -- wave energy converter -- Melnikov approach -- Markov approach -- irregular seas -- dynamical stability; Ships -- Periodicals; Offshore structures -- Periodicals; Marine engineering -- Periodicals; Marine engineering -- Technological innovations -- Periodicals; Ocean engineering -- Periodicals; Ocean engineering -- Technological innovations -- Periodicals; 623.8
• DOI: 10.1080/17445302.2020.1787932
• Languages: English
• ISSNs: 1744-5302

Abstract

ABSTRACT: Many wave energy converter (WEC) designs emerging over the recent years are floating cylindrical geometries with position-keeping mooring system. However, the dynamic stability of these novel floating structures under random sea states has not been investigated adequately. The Melnikov function model and the Markov process model are two efficient approaches providing quantitative predictions of capsizing. In this study, application of the two methods to a moored floating cylinder representing a generic WEC, has been explored to predict the risks of pitchpoling under random excitation. Using the Melnikov approach, the rate of phase space flux was evaluated to quantify the dynamic stability. This approach is compared with the Markov approach, which evaluates the mean first escape (capsize) rate to quantify the dynamic stability. The two methods are investigated through studies using various parameters. The similarity of their results and the differences of their approximations will be explored.