Method for detecting newly added line spectrum in vibration signal of dry vacuum pump

The invention belongs to the field of dry vacuum pumps, and particularly relates to a method for detecting a newly added line spectrum in a vibration signal of a dry vacuum pump, which comprises the following steps: in the initial stage of operation of the dry vacuum pump, collecting the vibration signal of the dry vacuum pump, sending the vibration signal to a processor, and obtaining the line spectrum position of a vibration signal power spectrum; mapping the line spectrum position feature of the vibration signal power spectrum into a feature vector, and storing the feature vector as a reference feature vector into a processor; in the working process of the dry vacuum pump in the set time period, vibration signals of the dry vacuum pump are collected in real time, and feature vectors under the real-time working condition are formed into a processor; the processor obtains a fault evaluation index according to the reference feature vector and the feature vector under the real-time working condition; and the w