Method for evaluating service life of metallic structure of offshore platform crane

Abstract

The invention relates to a method for evaluating a service life of a metallic structure of an offshore platform crane. The method comprises: a computer uses a wireless dynamic strain acquisition module to obtain strain time course data collected by a strain gauge arranged at a weak part of a metallic structure of a crane within fixed time; and the computer processes the strain time course data according to a rain-flow counting method, calculates a cumulative fatigue damage D of a component, and calculates a fatigue service life T of the component based on the cumulative fatigue damage D. Using the method provided by the invention, wireless strain monitoring and residual life evaluation on the metallic structure of the offshore platform crane can be realized remotely and wirelessly. On the basis of the service life evaluation result of the component, a corresponding service life prolong plan can be formulated before the fatigue damage of the component, so that the offshore platform crane can work normally and unnecessary losses can be reduced.

Description

technical field [0001] The invention belongs to the technical field of offshore platform crane monitoring, and in particular relates to a method for evaluating the service life of a metal structure of an offshore platform crane. Background technique [0002] With the development of the global marine industry and transportation industry, the demand for offshore platform cranes for cargo handling and personnel transportation such as offshore oil platforms and ships has surged. When the metal structure of the offshore platform crane is working normally, it usually bears various loads caused by its own weight, lifting load, environment, and platform ship movement, as well as impact forces such as lifting, boom luffing, and slewing motion; When the platform is lifted outside, it also needs to bear the impact force generated by the movement of the supply ship when the load is lifted. Some data show that 40%-60% of the metal structures of land-based cranes are subject to fatigue f...

AI Technical Summary

Problems solved by technology

The wired method usually consumes a lot of manpower and time, the detection efficiency is low, the wire connection fault is not easy to repair, and improper wiring will affect the movement of the mechanism

[0005] At present, there are also some testing technologies based on wireless sensor networks and CDMA public network remote monitoring applied to structural strain testing. These methods usually consider low energy consumption design, short transmission distance, and poor diffraction ability of metal obstacles, which cannot be realized for large metal Wireless Strain Monitoring and Residual Life of Structures

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