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Method for determining the optimum length of vibration measurement data

A technology for determining methods and data, applied in complex mathematical operations, etc., to achieve scientific results

Active Publication Date: 2019-01-01
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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Problems solved by technology

[0022] The purpose of the present invention is to provide a method for determining the optimal vibration measurement data analysis length by improving the multi-scale permutation entropy, using the sensitivity of the entropy value to the sudden change of the system dynamics, seeking a suitable data length with a relatively stable entropy value under the same state, To solve the selectivity problem of data length in data analysis

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  • Method for determining the optimum length of vibration measurement data
  • Method for determining the optimum length of vibration measurement data
  • Method for determining the optimum length of vibration measurement data

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[0063] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. In the existing multi-scale permutation entropy method, when the scale factor s is large, the time series is too short and contains too few data points, resulting in inaccurate generation of multi-scale permutation entropy For the problem of estimation, this embodiment adopts the moving average coarse-grained process to improve the accuracy of the results. For the specific process schematic diagram, see figure 1 ,Proceed as follows:

[0064] On a given scale factor s, the corresponding coarse-grained sequence is obtained by moving average, and the formula is as follows:

[0065]

[0066] At this time, the sequence length after coarse-graining is (n-s+1), if the original time series length n=600, s=15, the shortest coarse-grained sequence length obtained by the improved coarse-grained method is 586, and The length of the shortest coarse-grained sequenc...

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Abstract

The invention discloses a method for determining the optimum analysis length of vibration measurement data. A sensor device is arranged at the key position of the measured structure to obtain the vibration measurement data of the structure. The data of different lengths N are extracted, and the appropriate scale factor S is selected, and the vibration data are coarsely grained by the improved coarse graining method. The pseudo-near imminent method and mutual information method are used to determine the phase space reconstruction parameters m, tau of the coarse-grained data, respectively, and the phase space reconstruction is carried out. The permutation entropy and entropy values at different scales are calculated, and the homogenization of the permutation entropy and entropy values is taken as the multi-scale permutation entropy value MPE. The multi-scale entropy values of N vibration measurement data with different lengths are calculated, and the MPE (Li) which satisfies the precision requirement is selected. Then the shortest data length corresponding to MPE (Li) is defined as the best analysis length of vibration measurement data.

Description

technical field [0001] The invention relates to the technical field of engineering structure vibration testing, in particular to a method for determining the optimal analysis length of vibration measurement data by utilizing the stability of entropy value. Background technique [0002] For many large buildings in my country, including: hydraulic structures, bridges, tunnels and other structures, there is a problem of "reconstruction and light repair". Judging the operation status of the above large buildings from their appearance alone is far from meeting the evaluation requirements. Abnormal structural functions caused by various factors will inevitably lead to changes in structural vibration signals. Therefore, vibration measurement is an important way to monitor the operating state of structures and diagnose faults. [0003] An important prerequisite for solving vibration problems is to analyze the vibration measurement data of the research object. The main purpose of dat...

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Application Information

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IPC IPC(8): G06F17/10
CPCG06F17/10
Inventor 张建伟马晓君张翌娜赵瑜李洋程梦然
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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