| With the progress of science and technology and continuous development, rotating machinery is changing from low power and low speed to high power, high precision and automation direction gradually. For rotating machinery, unbalancing is the main factor to cause the vibration of the rotor, and which frequently caused the rotor loose, foundation and such as compound fault. In this paper, putting forward the precession decomposition dynamic balancing method based on the full vector dynamic balancing technology, it mainly aim at the malfunctions of composite rotor balance and can identify the unbalanced fault factors of interference effectively. It is of the great significance to reduce the blind trial weights and the production cost. This paper research the main content as follows:1. The application of full vector spectrum technology in rotor dynamic balance. Based on the full vector spectrum homologous information fusion technology, mix the same cross section direction perpendicular sensors measured the vibration information. Through the analysis of the main vibration vector and the assistant vibration vector, can determined whether it is concluded that the rotor unbalance fault happened, avoided the fault of miscalculation or false negatives by the single sensor signal to diagnose. Full vector dynamic balancing method which based on full vector spectrum technology use the main vibration vector of the rotor vortex semi-major axis of ellipse trajectory as balance goals, and make the elliptical initial phase angle as the imbalance of the corresponding phase angle. This method effectively combines the two directions sensor information, avoid one certain direction of vibration reduced but the other direction vibration is still very large using the single sensor to balancing.2. Precession decomposition dynamic balancing method and its application research. Based on the idea of full vector dynamic balancing, and through the numerical simulation and experimental analysis, get the view that the precession better reflect the size of the unbalance response and direction. Proposed the precession decomposition balancing method for the composite fault rotor, and this method takes the precession of rotor vortex frequency on elliptical orbit as the balancing goal, and use the precession of the radius of the circle and phase as the unbalance response of the rotor vortex, combines with influence coefficient method and computer aided dynamic to balance operation. Through the experimental verification, precession decomposition balancing method is superior to the traditional balancing method, and has better compatibility with the full vector dynamic balance method.3. The application research of precession decomposition dynamic balancing method in the compound fault rotor. For the compound fault rotor, when balanced to a certain degree, the unbalance response was still large and continued to balance but response not reduced. Aiming at this situation, using the precession decomposition dynamic balancing method and according to the variation of the ratio of backward and forward precession to judge the rotor has other fault or not. After eliminate the non-equilibrium factors, and continue to balance. This method have more advantageous to the dynamic balance of compound fault rotor which compared with to the full vector dynamic balance method, and have higher value of engineering application.4. The design of dynamic balance instrument which based on precession decomposition dynamic balancing method and its engineering application. Based on the full vector dynamic balancing method, make the precession decomposition dynamic balancing method embed in the instrument of PDES-F using C++ language. This method can implement the precession of the rotor balance of the single disc rotor and the double disk rotor. |
