Work

Time and Frequency Domain Dynamic Analysis of Offshore Mooring

Year: 2021

Type: article

Abstract: The numerical procedures for dynamic analysis of mooring lines in the time domain and frequency domain were developed in this work. The lumped mass method was used to model the mooring lines. In the time domain dynamic analysis, the modified Euler method was used to solve the motion equation of mooring lines. The dynamic analyses of mooring lines under horizontal, vertical, and combined harmonic excitations were carried out. The cases of single-component and multicomponent mooring lines under these excitations were studied, respectively. The case considering the seabed contact was also included. The program was validated by comparing with the results from commercial software, Orcaflex. For the frequency domain dynamic analysis, an improved frame invariant stochastic linearization method was applied to the nonlinear hydrodynamic drag term. The cases of single-component and multicomponent mooring lines were studied. The comparison of results shows that frequency domain results agree well with nonlinear time domain results.

Source: Journal of Marine Science and Engineering

DOI: 10.3390/jmse9070781

Authors: Shi He, Aijun Wang

Institutions: Shanghai Maritime University, Lloyd's, Lloyd's Register (United Kingdom)

Language: English

Topic: Offshore Engineering and Technologies

Subfield: Ocean Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,944

Funder: National Natural Science Foundation of China