| dc.description.abstract | Large rotating machines such as power motors or engines in power plants, textile factories, and petrochemical plants, or in the engine room on the bottom of the vessel, or aircraft engine rooms, etc., have harsh noise conditions and space limitations. Though balancing techniques belongs to a kind of traditional technology and have been developed for decades, there still exists unmet need. In response to this harsh working environment, this study developed an electromagnetic actuation technique for rotating machinery dynamic balancing can greatly reduce human intervention. The calculation procedure is similar to the influence coefficient method used in the usual balance correction, but it does not add extra weight by intervention, but changes the position of the steel ball on the balance turntable tract to achieve change after the calculation. The electromagnetic switch of the steel ball seat is used to brake, and the steel ball on the guiding track is positioned at the position where the balance turntable should be, so as to achieve the purpose of balance correction of the rotating machinery.
This thesis is divided into three parts-(1) unbalance vibration signal numerical simulation: synthesize simulation signal with mechanics, and design the unbalanced vibration signal which we can measured on the bearing. Then balance it with traditional counterweight approach and electro-magnetic actuation these produced state to verify the correction of the system; (2) the experiment platform and field balancing system design: the platform is designed for balancing experiment. The system with measurement, calculation, and control human machine interface is program by LabVIEW® and MATLAB®. The Wi-Fi module which connected with the computer can control the power switch of the seat; (3) verify field balancing on the experiment platform: verify the balancing ability of electro-magnetic actuation balance system on the designed rotary platform. The balancing plane has 5 asymmetrical slots and 3 positioned keyhole on each slot, it can be balanced by controlling the counterweight steel ball, the outer ring of the balancing plane have 15 screw hole. The experiment is designed by 900rpm and 1000rpm two rotation speed. After balanced by adding counterweight on the turntable outer ring, the vibration of the platform can decrease over 90%. While the rotary platform approximate balanced, add counterweight to design known unbalance vibration data for verifying. Known counterweight is added at the outer ring of the balancing plane , each of it is 60 degrees away from others, the accuracy of adding counterweight on the turntable is 78.6–94.8%. Known counterweight is added at the outer ring of the balancing plane , each of it is 90 degrees away from others, the accuracy of using the designed electro-magnetic actuation is 78.9–97%, and the vibration can decrease 49–86% by using the calculation result for balancing. Finally, verify the ability of electromagnetic actuation balancing system. According to the standard ISO 1940, with two different rotation speed, it is proved that the balancing level of the rotor system can fall under G 6.3. The design system can effectively satisfy the goal of balancing.
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