In order to find out the effect of unbalanced eccentricity on the dynamic performance of inclined cracked rotor, a respiratory crack modeling method based on the crack open-closed line theory was used to establish the dynamic model of a typical double-disk rotor with cracks, and a comparative calculation of different schemes of unbalanced eccentricity was carried out. The results show that the increase of the unbalance eccentricity will lead to the increase of the transverse amplitudes of the double-disc rotor system, in which the fundamental frequency component of the transverse vibration is significantly carried, and the main frequency component also changes from the dominant position of twice frequency to the dominant position of fundamental frequency.
In order to detect and diagnose the existence of fatigue cracks in the transmission shafting of rotating machinery equipment as early as possible, the influence of mass eccentricity factor on the cracked rotating shaft was investigated, this paper built a cracked rotor comprehensive fault simulation test bench, conducted experimental research on typical transmission shafting samples with straight cracks, and obtained its response signals under different noncentral mass (1g and 2g) and different noncentral phase angles (0°, 90° and 180°). Time domain diagram, frequency domain diagram and axis locus diagram. The results show that the increase of noncentral mass and noncentral phase angle will lead to the increase of 1st frequency, but has little effect on 2nd frequency.
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