Research Of The Rotor’s Movement Form Based On The Modal Analysis And The Information Fusion Technology

At present, with the rapid development of the national economy, All kinds of large rotating equipment towards the orientation of high power, high speed and high precision. Therefore, it must have the higher requirements in the detection and diagnosis of rotating equipment. As the core of large rotary equipment parts, the running state of rotor will directly affect the normal operation of equipment. According to the statistics of the domestic and foreign scholars and engineering technical personnel. The60%of faults is caused by the misalignment of the rotor axis in the rotor faults. Experts and scholars has been studied on the failure and the mechanism, but it is insufficient in how to quantify the misalignment of the rotor in the practical engineering.This paper use the mode analysis and the full vector spectrum technology of the homologous information fusion technology to to realize visualization of the space motion form of the rotor and put forward an quantitative analysis method of the rotor system in the engineering practice:First, in the movement patterns of the rotor system, it establish the rotor model, the rotor vibration modes of all order critical speed are obtained through the ANSYS dynamic modal analysis, and simulate the rotor misalignment for the vibration signal of each sensor node. Using full vector spectrum information fusion technology to fuse data and get the vibration information of the rotor, these data will be brought into the mode of vibration of rotors, and using the linear theory to extend to the whole of the rotor, and then get the rotor dynamic form of spatial vortex.Secondly, in the quantitative evaluation of the rotor misalignment, to evaluate the misalignment of two rotor axis from two aspects of static to dynamic. Using eight eddy current displacement sensor to collect the rotor motion information in four section of the two rotor, and using multimeter to directly measure the DC steady state voltage signals of eight sensors. Using the linear theory to extend the rotor axis offset of the four section to the whole of the rotor, and then get the two rotor coupling rotor misalignment in quantity.Finally, combining the two aspects of rotor system morphology and rotor misalignment quantitative evaluation, to provide effective guidance for the technical personnel on the fault diagnosis and the quantitative evaluation of the rotor misalignment.