|Publisher||Offshore Technology Conference||Language||English|
|Content Type||Conference Paper|
|Title||Mooring Line Dynamics: Comparison of Time Domain, Frequency Domain, and Quasi-Static Analyses|
|Authors||C.T. Kwan, F.J. Bruen, Exxon Production Research Co.|
Offshore Technology Conference, 6 May-9 May 1991, Houston, Texas
|Copyright||1991. Offshore Technology Conference|
This paper discusses the modeling and verification of frequency and time domain dynamic mooring analysis procedures, their applications and limitations, and compares them with conventional quasi-static mooring analysis. It presents a number of examples in which the maximum line tensions, anchor loads, and suspended line lengths, as derived by various procedures, are compared for generic Mobile Offshore Drilling Units (MODU) and Floating Production Systems (FPS) operating in various environments.
The discussion in this paper provides the basis for many recommendations on mooring analysis procedure incorporated into the API RP-2FPl "API Recommended Practice for Design, Analysis, and Maintenance of Mooring for Floating Production Systems".
Exxon Production Research Company (EPR) has conducted significant research in mooring line dynamics in the last two decades. The research activities include:
The recently completed API RP-2FP1, which has been approved by API for publication in early 1991, incorporates many recommendations derived from the above research activities. Some of the research results have been published in Reference 3 in support of the API document. This paper, which further supports the API document, discusses the following topics:
The emphasis in this paper is on the application of the various procedures to mooring designs, rather than a detailed explanation of the underlying theory.
MOORING ANALYSIS METHODS
Dynamic Versus Quasi-Static Analysis
In general, environmentally induced responses of a floating vessel can be divided into three frequency ranges:
|File Size||2,026 KB||14|