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Active vibration control in hydraulically supported machinery
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School of Engineering |
Master's thesis
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en
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75
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Active vibration control methods in hydraulic supports were investigated in this thesis. The research stems from vibration problems in paper winders, where excessive vibration of hydraulically supported components can cause safety concerns and sub-optimal product quality. Proportional control valves were used for vibration compensation, and P and PI control with acceleration feedback was chosen as the control method.
In the work, a simulation model and an experimental laboratory system were built. The gains of the controller were optimized using a genetic algorithm in both the simulation model and the experimental system, and the extent of their vibration compensation was measured at the resonance frequencies of the experimental system. The study also evaluated how genetic algorithms are able to optimize controllers designed for vibration compensation.
The performance of the controllers was measured with an experimental system in different configurations. The P-controller optimized by simulations reduced the acceleration amplitudes by 48%, which was the highest measured compensation ability. At worst, the PI controller tuned by simulations increased the acceleration amplitudes by 131%. The controllers optimized with the experimental system reduced acceleration amplitudes by 44% at their maximum, and reduced accelerations in all configurations. While the method would likely require a position control to be useful in industry applications, the controller managed to reduce a noticeable amount of acceleration from the experimental setup. Thus a paper winder would likely already see a performance benefit using this controller. Due to the high frequency and long duration operation of the valve, future work should seek to implement the same technology with a less fatigue prone valve.