A load identification method for offshore platform water pumps

Abstract

The invention relates to a method for identifying the load of a water pump on an offshore platform. The method includes: the first step, testing the response signals of each measuring point of the water pump under normal starting conditions; the second step, testing the response signals of each measuring point when the water pump is turned off ; The third step is to calculate the correlation coefficient and extract the data samples; the fourth step is to calculate the harmonic time domain signal. With higher accuracy, it can accurately extract the real load of the offshore platform water pump, and provide a basis for subsequent structural optimization design, finite element simulation calculation, fault identification and life prediction.

Description

technical field [0001] The invention relates to the field of structural mechanics performance testing and analysis, in particular to a method for identifying loads of water pumps on ocean platforms. Background technique [0002] There are three major problems in the field of dynamics research - structural dynamic response, structural dynamic characteristics (modal) and load identification. Among them, the technology of the first two types of problems is relatively mature, but load identification has always been the biggest difficulty in structural dynamics, and it is also a very critical issue. Any product design needs to determine the load first, in order to estimate the product in the actual working process. state, so as to complete the optimization work of the equipment in the design stage. [0003] The vibration problem of the marine deck has always been a phenomenon of great concern, especially the deck vibration causes the life of water pumps and other equipment to be...

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Problems solved by technology

[0003] The vibration problem of the marine deck has always been a phenomenon of great concern, especially the deck vibration causes the life of water pumps and other equipment to be greatly shortened, and the probability of failure is greatly increased

[0009] For the second method above, since any structure or equipment has infinite degrees of freedom, the modal results obtained by the experimental modal technique are all truncated, which is very different from the real dynamic characteristic matrix; secondly, in the experimental The dynamic matrix obtained by the modal is difficult to achieve complete decoupling, that is, singular, and the inversion of the singular matrix will produce a large error, so the load obtained by this method has great uncertainty

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