Productive Method and System to Control Dimensional Uncertainties at Final Assembly Stages in Ship Production

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Abstract
Strict dimensional control of interim products through the different assembly stages is vitally important for profitable ship production [1].3 Studies in Finland show that a 30% reduction in labor costs is possible in hull construction [2]. This reduction can be gained by eliminating unnecessary fitting and reworking using tight accuracy control methods. This paper presents a method for dimensional control of block assemblies. The dimensional control is thereby separated from the positional control of the block. The method is a 3D-coordinate-based approach relative to a positional reference system. Also described is a real dimensional control case and an evaluation of different measurement technologies in performing the proposed task. The evaluation is comparable to a 1990 system study performed at NASSCO in San Diego [4],

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