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This report is concerned with the analysis and countermeasure of vibrations which are caused when a hydraulic actuator controlled with a solenoid valve turns. A controller in a ring twisting machine was taken as a model.Experiments, analog simulation and theoretical analysis have revealed that such vibrations occur due to the inertia force of the mass and the compressibility of oil. Known methods can reduce vibrations, for example, by adding a shock absorber or by removing excess oil pressure in the cylinder by a check valve, but they prevent a sharp response of the actuator. Our method of reducing vibrations sequntially controls a solenoid valve three times during one turning of the actuator in the ring twisting machine. Analog simulation suggested the effectivenes of this method. The experiments have proved that this method has a great effect in reducing vibrations without affecting the sharp response of the actuator.
公益社団法人計測自動制御学会の論文