Estimation of encountered wave elevation sequences based on response measurements in multi-directional seas. (June 2023)

• Record Type: Journal Article
• Authors: Takami, Tomoki; Nielsen, Ulrik Dam; Jensen, Jørgen Juncher; Chen, Xi
• Is Part Of: Applied ocean research. Volume 135(2023)
• Publication Date: 2023-06
• Subjects: Multi-directional waves -- Wind-waves -- Swell -- Wave estimation -- Prolate spheroidal wave functions; Ocean engineering -- Periodicals; 620.416205
• DOI: 10.1016/j.apor.2023.103570
• Languages: English
• ISSNs: 0141-1187

Abstract

Abstract: This paper presents a new approach for estimating encountered wave elevation sequences by use of measured ship responses, where wind-waves and swell may come from different directions, i.e. bi-directional waves. The main assumption of the approach, making use of Prolate Spheroidal Wave Functions (PSWF), is that the wave field is represented by multi-directional irregular waves. Thus, combining available measured responses, the phases and amplitudes of the multi-directional irregular waves are derived as the solution, by which the wave profiles can be estimated. Numerical investigations using artificially generated response measurements (sway, heave, pitch, vertical bending moment) of a bulk carrier in uni-directional and bi-directional long-crested as well as short-crested sea states are made. It is shown that the present approach can accurately estimate wave elevation sequences in such sea states.