Optimization design for steel catenary riser with fatigue constraints

Yang, H.-Z. , Li, H.-J. and Park, H.-I. (2011) Optimization design for steel catenary riser with fatigue constraints. International Journal of Offshore and Polar Engineering, 21(4), pp. 302-307.

Abstract

This paper presents an efficient optimization strategy for deepwater risers' design under fatigue life constraints. The Steel Catenary Risers (SCR) concept has been considered to be a vital option for most new deepwater field developments around the world. The deepwater riser design is characterized by the consideration of numerous load cases, geometric nonlinearity and highly responsive dynamic nature of the system. It is very computationally expensive for the optimization process. Moreover, very little research has been conducted to incorporate the fatigue constraints into SCR optimization design. As water depths increase further, the large vertical motion at the semi or FPSO induces severe riser response, which results in difficulty meeting strength and fatigue criteria at the hangoff and touchdown point locations. This work analyzes the use of an Island-based Genetic Algorithm (IGA) to minimize the riser cost while keeping all constraints satisfied. A Kriging method in conjunction with design of experiments is used to construct an approximation model for dynamic and fatigue analysis. The geometric size and density of the coating types for SCR are varied so as to determine an optimum configuration. It demonstrates the effectiveness of this optimization strategy by integrating the approximation model into the design process considering fatigue life constraints.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Yang, Dr Hezhen
• Authors: Yang, H.-Z., Li, H.-J., and Park, H.-I.
• College/School: College of Science and Engineering > School of Engineering > Infrastructure and Environment
• Journal Name: International Journal of Offshore and Polar Engineering
• Publisher: ISOPE
• ISSN: 1053-5381