Hull longitudinal strength stress monitoring method

Abstract

The invention relates to a hull longitudinal strength stress monitoring method comprising the following steps: selecting a straight line with the length as L in the hull longitudinal direction as a stress monitoring target; attaching a foil gauge I in the middle point of the selected straight line with the length of L, respectively attaching a foil gauge II and a foil gauge III on the straight line and placing the two on two sides of the foil gauge I, wherein the distance between the foil gauge II and III and the foil gauge I equals to 38.7% of the L; obtaining the real time stresses [sigma]1,[sigma]2 and [sigma]3 of the foil gauges I, II and III, and using a formula [sigma]=(0.5555556*[sigma]2+0.8888889*[sigma]1+0.5555556*[sigma]3) / 2 to obtain the monitoring average stress [sigma]. The method employs a method of attaching the foil gauges to replace a long baseline strain gauge, thus monitoring ship stresses and strains with more accuracy and efficiency in real time; the patches are small in size and flexible in mounting; the method is simple in a monitoring process, high in accuracy, and safe in data measurement.

Description

technical field [0001] The invention relates to a method for monitoring the overall longitudinal strength stress of a hull, in particular to a method for monitoring the overall longitudinal strength stress of a hull using strain gauges. Background technique [0002] Structural safety is the basis for ensuring the normal operation of large ships. In the structural design of large ships, designers need to refer to the structural design codes or guidelines of relevant classification societies, combined with relevant theoretical methods, to determine the various design loads of large ships , and then carry out relevant structural design and strength assessment. However, for ships navigating in the actual marine environment, the external loads on the structure have strong randomness, and these random factors are difficult to be completely and accurately predicted by the methods in the codes or guidelines. Therefore, although the classification society has given the codes or guid...

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Problems solved by technology

[0003] In the past, structural stress monitoring was mainly realized by long baseline strain gauges. However, for container ships with large openings, the deck area is small. If the long baseline method is used for monitoring, it will cause adverse effects such as occupying deck space and affecting the work of the crew; For deck girders below the deck, the long baseline method has difficulties in equipment installation and inaccurate measurement, which is very inconvenient for real-time monitoring of the ship's stress state

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