Fundamental frequency identification method in cable force detection

The invention relates to a fundamental frequency identification method in cable force detection. The method comprises the steps that fist, the time domain vibration signals of a cable are collected, and then the collected time domain vibration signals are regulated to obtain time domain vibration response signals; the obtained time domain waveform signals are preprocessed and subjected to self-power spectrum analysis, so that a first spectrogram containing the cable fundamental frequency is obtained; the obtained time domain waveform signals are subjected to wavelet packet reconstruction, and then the signals are subjected to self-power spectrum overlapping multiplication processing to obtain a second spectrogram related to the cable; the first spectrogram and the second spectrogram are compared to finally determine the fundamental frequency of the cable. According to the method, the design is ingenious and reasonable, low-frequency interference noise can be effectively eliminated, the cable signals are analyzed through a double-spectrogram method, the precision for obtaining the fundamental frequency is improved, and the clear and accurate cable fundamental frequency can be obtained.