Construction and Retrieval Method of Aircraft Vibration Fault Database Based on Perceptual Hash Algorithm
A perceptual hash algorithm and database technology, applied in the field of fault diagnosis of civil aircraft vibration data, can solve problems such as small measurement frequency band, large measurement error, and inability to measure, achieve rapid positioning, meet engineering precision requirements, and be easy to implement.
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[0025] Below, refer to the attached figure 1 and figure 2 As shown, in order to better illustrate the design principle of the present invention, the preferred embodiment is given as an example, as follows:
[0026] The construction and retrieval method of aircraft vibration fault database based on perceptual hash algorithm includes the following specific steps:
[0027] Step 1. Read in test data: read time domain test data;
[0028] As an example, the time domain data to be processed is read from the time domain test data as: f 1 (t), the f 1 (t) is a one-dimensional signal;
[0029] Step 2, filtering and resampling: filtering and resampling the time domain test data to be processed;
[0030] As an example, for the read time domain data f 1 (t) Filter and resample, the sampling period is T, and the data after resampling is f 2 (t);
[0031] Step 3, wavelet transformation: select a suitable and fixed wavelet base to perform wavelet transformation on the time domain dat...
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