Method and system for monitoring lubrication state of main bearing of wind turbine generator and equipment medium

The invention discloses a method and system for monitoring the lubrication state of a main bearing of a wind turbine generator and an equipment medium, and the method comprises the following steps: S1, obtaining a vibration signal of the main bearing, obtaining M segments of sub-signals, each segment of sub-signal containing N data points; s2, reflecting the wear condition of the equipment by adopting three indexes, namely a root-mean-square value, a peak value and a peak value factor, for each section of sub-signal; s3, transforming each index by adopting a maximum and minimum standardization method, so that the result value of each index is mapped to a range of [0, 1]; s4, determining the weight of each index after transformation by using an entropy method; and S5, a fusion index T of the whole M segments of sub-signals is constructed through the converted indexes and the weights of the indexes, the larger the T value represents the larger the wear degree, the worse the lubrication state and the higher the