Marine structure Laplace domain dynamic response transient separation method

Abstract

The invention relates to a maritime work structure Laplace domain dynamic response transient separation method, which comprises the following steps of carrying out segmentation processing on a load, and constructing a structure Laplace domain dynamic response equation of each segment; carrying out Laplace transformation on the dynamic response equation, and decomposing the structural dynamic response of each fragment into a load action steady-state response item and a transfer transient response item; solving a load action steady-state response item; separating a transmission transient response item of the time scale node, and calculating a structural dynamic response of each segment; and performing Laplace inverse transformation on the structure dynamic response of each segment to obtaina time domain response of each segment. According to the method, the dynamic response of the structure is solved in the Laplace domain in a segmented manner; compared with a traditional time domain method, the method has the advantages that the accuracy is higher, the sensitivity of the traditional time domain method to time interval selection is avoided, and meanwhile, the calculation efficiencyand the calculation accuracy of the traditional Laplace domain method during structural dynamic response are also greatly improved.

Description

technical field [0001] The invention belongs to the technical field of Laplace domain dynamic response analysis, and in particular relates to a transient separation method of marine structure Laplace domain dynamic response. Background technique [0002] Fixed offshore structures, such as jacket platforms, offshore wind turbines, etc., are commonly used in offshore oil, gas and renewable energy extraction. In order to ensure the safety of structures throughout their service life, dynamic analysis of structures during their service life plays a vital role. When performing dynamic analysis on offshore structures, it is usually necessary to study its dynamic response under long-term loads in normal, severe and extreme sea conditions, so as to predict its fatigue life. Therefore, how to consider the relationship between accuracy and computational efficiency in the analysis process has become a key issue in structural design. [0003] The Laplace domain dynamic response analysi...

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Problems solved by technology

However, as the processing time of segment signals increases, the calculation time of this method will increase rapidly, such as figure 2 (a) shows an upward trend curve; at the same time figure 2 The curve of the downward trend in (a) shows the correlation coefficient between the reconstruction result and the measurement result as the fragment grows. It can be seen that as the time period increases, the correlation between the reconstruction result and the measurement result becomes worse and worse.

at the same time, figure 2 (b) shows the reconstruction result when the processing time period is 10s to 75s. It can be seen that the result is far from the original signal, and the original signal cannot be correctly represented.

[0004] In the design of marine engineering structures, such as long-term structural safety prediction and structural fatigue life prediction, it is usually necessary to calculate the dynamic response of the structure under long-term loading, and the dynamic response analysis method in the Laplace domain proposed by Hu et al. will no longer be applicable

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