嵐モデルに基づいた疲労センサによる船体構造の疲労寿命推定手法の高度化: 第2報:頻度データを活用した推定手法

摘要

The characteristics of Fatigue Damage Sensors (FDS) that are in use for fatigue life estimation of monitoring structural welding members in ship structures are discussed in order to improve prediction accuracy of estimated fatigue life exposed to random wave loads such as storms under various loading conditions peculiar to ship structures. In our past research, coefficients, which named load effect factors (LEFs) affected by loading histories against constant amplitude loading were introduced for the estimation procedure using FDSs and confirmed by numerical simulations and fatigue tests under simplified storm-type loading patterns or load histories based on a storm model in consideration of variable of sea areas and seasons. In this paper, we proposed the estimation method of the abovementioned LEFs using several frequency distribution data such as significant wave height and stress obtained from a storm model simulated actual sea condition.%船体構造の疲労寿命を簡便にモニタリングする一手法として，疲労センサを用いる手法がある.疲労センサは，モニタリング期間中に蓄積される疲労損傷度が疲労センサ上のき裂長さとして出力されるだけなので，取り扱いが単純で，施工上のコストも軽減できる.したがって疲労センサは，著者らが提案する船舶の就航中の予防保全(Proactive Management)の主要な構成要素である船体疲労管理システム(HFMS, Hull Fatigue Management System)の中核ツールとして有用と言える.