Hull longitudinal strength stress monitoring method

A stress monitoring and hull technology, applied in force/torque/work measuring instruments, measuring devices, instruments, etc., can solve the problems of inconvenient monitoring of the stress state of ships, occupying deck space, affecting the work of crew members, etc., to achieve favorable and accurate safety. High performance, flexible setting and installation

Inactive Publication Date: 2018-07-03
HARBIN ENG UNIV
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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

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  • Hull longitudinal strength stress monitoring method
  • Hull longitudinal strength stress monitoring method
  • Hull longitudinal strength stress monitoring method

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[0033] Examples:

[0034] Monitoring object: 21,000 boxes of ultra-large container ships.

[0035] Main dimensions: total length: 386.0m; moulded width: 58.6m; moulded depth: 33.5m; design draft: 14.5m.

[0036] Such as Figure 4 , Figure 5 As shown, a certain section of the deck plate near the midship that needs to be monitored for longitudinal strength is taken as the target. Such as Image 6 As shown, the black deck area is the deck plate that needs to be monitored.

[0037] Determine the placement of strain gauges, such as Figure 7 As shown, 5 is the rectangular deck panel of the monitoring target. 1, 2, and 3 are three strain gauges respectively attached to the lower surface of 5, of which, 2 is attached to the center of 5, the longitudinal distance of 1 to 2 is 38.7% of the length of 5, and the longitudinal distance of 3 to 2. It is also 38.7% of the length of 4, that is, 1 and 3 are arranged symmetrically with respect to 2.

[0038] Choose suitable positions and paste three ...

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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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Application Information

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IPC IPC(8): G01L5/00
CPCG01L5/0047
Inventor 任慧龙刘帆冯国庆傅鹏周学谦许维军李辉李陈峰孙树政刘宁
Owner HARBIN ENG UNIV
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