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原文传递 DETECTION PROBABILITY ASSESSMENT OF VISUAL INSPECTION OF SHIPS

题名：	DETECTION PROBABILITY ASSESSMENT OF VISUAL INSPECTION OF SHIPS
作者：	Laura A. Demsetz; Juan Cabrera
关键词：	inspections, detection, POD, tanker
摘要：	The work described in this report is part of an ongoing effort to determine the probability of detection (POD) in marine structural inspections. An understanding of POD can help ensure safe, cost-effective lifecycle operation of marine structures, allowing the appropriate combination of design assumptions and scheduled inspections. Work to date at U.C. Berkeley has focused on the inspection of oil tankers. In a previous project, a preliminary model of the factors affecting POD in tanker inspection was developed. Reviews of literature and interviews with inspectors indicated that die factors associated with an inspector, in particular, experience, would likely be important determinants of POD, along with factors such as access and lighting. Several approaches for evaluating PCD were identified, with benchmarked inspection data (a comparison of two inspections of the same structure that take place within a relatively short time) and in situ experiments (a comparison of the performance of multiple inspectors inspecting the same structure under controlled conditions) considered to be the most promising. An application of the benchmarked inspection data approach to historical survey data for two ships highlighted die importance of several factors: prior knowledge of the history of a particular vessel and sister ships, the purpose of the inspection, and factors such as lighting, access, and cleanliness that may be different for different tanks on the same ship. In the work described here, in situ experiments are used as a means of obtaining POD information. The rationale for the use of in situ experiments is first described, along with the advantages and disadvantages of these experiments with respect to other means of obtaining POD information. Results of this experiment are presented as well. Conclusions regarding POD in tanker inspection and regarding the in situ inspection method are drawn in the final section of this report.
报告类型：	科技报告