Efficient time simulation method for predicting the 100-year extreme responses of an offshore platform

ABSTRACT

The most reliable technique for predicting the statistical properties of the response of an offshore structure to random wave loading is the conventional time simulation method (CTS). However, this study is concerned to reduce the computational demand of this method due to long simulation needed for stable results. To this end, a more efficient version of the time simulation technique (ETS) has been introduced which divides the simulated response extreme values into several groups based on the magnitude of the extreme values of their associated surface elevation or linear response records. The method has proved to be very efficient for both low and high-intensity sea states. In this study, the 100-year extreme responses from ETS and CTS methods have been compared to examine the accuracy of the ETS technique. Overall, the ETS technique was found to be many times more efficient than the conventional method.

KEYWORDS:

• Offshore structure
• extreme values
• Morison’s equation
• reliability assessment
• time simulation

Disclosure statement

No potential conflict of interest was reported by the authors.

Notes on contributors

M. K. Abu Husain is a senior lecturer at Razak Faculty of Technology and Informatics at Universiti Teknologi Malaysia, Malaysia. He received the MEng and PhD degrees in civil and environmental engineering, and offshore engineering from the University of Liverpool, UK, in 2007 and 2011, respectively. He has co-authored more than 50 journal papers and 100 conference papers and has been involved in more than 40 research projects.

N. I. Mohd Zaki is a senior lecturer at Razak Faculty of Technology and Informatics at Universiti Teknologi Malaysia, Malaysia. Her current research interest focusses on naval engineering and marine technology. She has published more than 100 articles, journals and conference proceedings. She was also involved in numerous international and national research projects.

G. Najafian is an honorary research fellow of the School of Engineering, University of Liverpool, United Kingdom. He has over 25 years of teaching, research, and industrial experience, during which he has supervised many sponsored research projects and offshore consultancy assignments both in the United Kingdom and abroad. He has published over 100 research papers in international journals and refereed conferences organised by professional societies around the world.

ORCID

M. K. Abu Husain http://orcid.org/0000-0001-7290-0962

N. I. Mohd Zaki http://orcid.org/0000-0002-2745-5537

G. Najafian http://orcid.org/0000-0002-8161-4172

Additional information

Funding

This work was supported by Universiti Teknologi Malaysia (Malaysia): [Grant Number Q.K130000.2540.17H99]; Universiti Teknologi Malaysia (Malaysia): [Grant Number Q.K130000.2540.18H09]; Universiti Teknologi Malaysia (Malaysia): [Grant Number R.K130000.7740.4J312].