National Shipbuilding Research Program. 1995 Ship Production Symposium. Paper No. 13: 3-D Computerized Measuring Systems for Increased Accuracy and Productivity in Shipbuilding and Repair.

摘要

Conventional measurement and alignment methods for shipbuilding and repair are no longer compatible with today's technology. Measurements made with plumb bobs, taught wires, transits, optical- mechanical theodolites, levels and wooden templates, while adequate in many applications, are labor intensive and leave some redundancy with regard to accuracy. With the increased popularity and use of the personal computer during the 1980's, several laser, electronic theodolite and photogrammetry based measurement technologies emerged. These methods require highly skilled workers, and although they increased the reliability of measurements, they are costly and again are labor intensive (Horsmon, 1991). This report describes two computer based measurement systems. Each system requires only a single operator to generate three dimensional coordinates rapidly and accurately. Each system measures in the spherical coordinate system of the instrument. The supporting software programs allow for the transformation of the measured data to the blue print values or object coordinate system. Data can be imported from CAD or lofting software for measuring or locating specific points of interest, or can be exported for comparison of as-built coordinates with design values.