Applications of the Dynamic Stability Analysis to the Primary Planning of the System

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Other Title
  • 振れ回り運動の安定判別式を用いた初期計画
  • イッテン ケイリュウ システム ノ キホン ケイカク シュホウ ニ ツイテ 1
  • 一点係留システムの基本計画手法について: その1 : 振れ回り運動の安定判別式を用いた初期計画
  • On the Basic Design of Single Point Mooring Systems (1st Report)
  • 一点係留システムの基本計画手法について (その1)

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Abstract

In the designing of the single point mooring (SPM) systems, slow oscillation or weather vane motion of the moored vessel is a critical problem, because the cost performance of the system on the view point of the rate of operation is affected by the excessive mooring force induced by the oscillation.<BR>As for the theoretical approaches to estimate the oscillation, numerical simulations in the time domain have been developed and used widely, however the reliability of such simulations are not sufficient so far. Therefore it is said that model tests can not be avoided at the final or important stage of the design.<BR>The dynamic stability analysis is another theoretical approach, which is a simple technique but has hardly been employed in the practical designing. A main reason is that the analysis can not give the amplitude of the oscillation or the mooring force but only show the stability of the moored vessel, in other words, whether the slow oscillation arises or not.<BR>But on the basis of the slow oscillation being a critical factor, simple technique is better to be applied practically in designings, even if the limited informations about the slow oscillation can be obtained.<BR>In this paper, practical applications of the dynamic stability analysis to the primary planning of SPM systems are discussed. And it is pointed out that some particulars of SPM systems, such as length of mooring hawser, mooring position, optimum shape of the moored vessel and effective control systems for the slow oscillation etc. can be examined by this analysis.

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