A Systematic Scheme of Hull Stress Monitoring

초록

The increase of bulk carrier accidents in the late 1980s and the seriousness of oil pollution by tanker accidents in the early 1990s prompted the IMO and the IACS to take various steps to improve the safety of such ships. As an effective measure, it has been recommended to fit hull monitoring systems which can give ship operators the information on ship motions and hull stress during navigations or loading/unloading operations in port. Judging from the real-time information on ship structural response, operators can take timely corrective action by modifying speed and/or heading to prevent the unexpected damage of ship structure. The accumulated data obtained from long-term measurements can also be applied to verification and development of classification rules. However, it is necessary to develop the systematic and rational monitoring system for improving the reliability on such important information. In this study, the fundamental requirements and recommendations for the fitting of HSMS proposed by IMO and classification societies, the characteristics of main equipments of HSMS and the basic theory concerned are introduced as a preliminary step. Displays of resultant data by a hull stress monitoring system already developed are presented as an example.