Development of Ship-borne Type Directional Wave Recorder

船载式定向波记录仪的研制

• 批准号: 05555270
• 负责人: HIRAYAMA Tsugukiyo
• 金额: $ 8.58万
• 依托单位: YOKOHAMA NATIONAL UNIVERSITY,Faculty of Engineering
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05555270/
• 关键词: DIRECTIONAL SPECTRUM WAVE; WAVE RECORDER; SHIP BORNE TYPE; SHIP MOTION

Wave data including wind wave and swll is very important for the design or operation of ships or ocean structures in deep sea. Until now those data were obtained through the obsevations by manual on deck. Manual method is not so accurate and difficult in the dark at nights.So automatical measurement was strongly desired.This reseach was devoted to the development of the estimation of encountered directional wave spectrum from responses of a running ship. Not only motions but also relative wave heights were measured and directional spectrum wave was estimated by the method of so called MLM.At the same time one to three correspondence problem between encountered frequency and wave length were resolved by applying MLM . These methods were confirmed by model experiments in a towing tank and by full-scale measurements.Finally the base of an automatically estimating method was established.

海浪数据包括风、浪和横浪，对深海船舶或海洋结构物的设计或运行具有重要意义。到目前为止，这些数据是通过观察通过甲板上的手册获得的。人工方法在夜间的黑暗环境下精度不高，测量难度大，因此迫切需要自动测量。本研究致力于从航行中的船舶响应中估计遇到的方向波谱。该方法不仅可以测量运动，还可以测量相对波高，用最大似然方法估计出方向谱，同时用最大似然方法解决了遭遇频率与波长之间的1~3个对应问题。通过拖曳水池的模型试验和实船测量，验证了这些方法的有效性，为自动估算方法奠定了基础。