False identifying method for modal parameter of ocean structure
A technology of marine structure and modal parameters, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problem of difficulty in accurately analyzing vibration and vibration performance, inability to determine the true mode of the structure, signal deviation from vibration characteristics, etc. To overcome the problem of judging the true mode of the structure, the engineering application prospect is good, and the error is reduced.
Active Publication Date: 2015-06-24
OCEAN UNIV OF CHINA
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However, these signal analysis methods generally have the following defects in practical application: first, it is difficult to accurately analyze the vibration performance carried by the vibration itself; Vibration characteristics carried by the original vibration signal
[0004] Conventional modal parameter identification technology, when the environmental noise is obvious, in order to identify relatively weak modal information, it is often necessary to artificially increase the modal recognition order, resulting in a large number of false modes
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[0036] On-site testing of marine engineering structures such as offshore platforms, offshore wind power, and offshore booster stations is difficult to implement, and there are many sources of test data errors. The real response signal is often polluted by various test errors. During the actual measurement of the offshore platform, in order not to affect the normal use of the platform and avoid unnecessary structural damage, the platform excitation force adopted is generally relatively small relative to the structural bearing capacity, and is often more inclined to the excitation of natural environmental conditions, which leads to the actual measurement. The signal-to-noise ratio in the signal is relatively low, and the high-order mode information contained in the measured signal is also relatively small. Under the condition of low signal-to-noise ratio, part of the real signal in the measured signal is often filtered out as noise to a certain extent, and relatively high-order m...
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The invention provides a false identifying method for a modal parameter of an ocean structure. The false identifying method comprises the following steps: A) acquiring an actual measured signal of the ocean structure; B) separating, smoothing and reconstructing the actual measured signal of the ocean structure; C) constructing an identifying core matrix for the modal parameter of the ocean structure; and D) identifying if the modal parameter of the ocean structure is false. According to the false identifying method, the defect that a false mode must be considered for identifying when the false mode is stronger than a target identifying mode is overcome, the modal identification of an ocean engineering structure is realized by utilizing the smallest core matrix and the engineering application prospect is wide.
Description
technical field [0001] The invention relates to a method for false-free identification of modal parameters of marine structures, in particular to the identification of modal parameters of offshore platforms, offshore wind power, and offshore step-up stations under natural environment excitation conditions. Background technique [0002] The offshore platform structure is the basic facility for the development of offshore oil and gas resources, and the base for offshore production, operation and life. With the rapid development of my country's offshore oil and gas resources development activities, the structure of offshore platforms has also been developed at a high speed, and more than 300 offshore platforms of various types have been built. The structure of offshore platforms is complex and expensive, and compared with land structures, their service environment is harsher. It not only bears the long-term effects of environmental loads such as wind, waves, currents, sea ice ...
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IPC IPC(8): G06F19/00
Inventor 刘福顺李华军秦俊飞许立悦战刚卢洪超陈文文曹锦超侯法垒
Owner OCEAN UNIV OF CHINA