Vibration analysis and optimization of a vertical disc stump grinder

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Abstract
The vibration of the handles of a vertical disc stump grinder causes significant damage to people who operate the machine for a long time. First, we tested the vibration of the handle of a vertical disc stump grinder. Second, we evaluated the allowable years of operating the vertical disc stump grinder according to the assessment standard ISO 5349 for human exposure to hand-transmitted vibration by the International Organization for Standardization. Third, we established a finite element model of the stump grinder based on the experience model of the engine and the power spectrum of the cutting force of the grinder. Finally, we proposed an optimization scheme for the vertical disc stump grinder according to the finite element model. The experimental results indicate that the output weighted acceleration of the existing handle of the vertical disc stump grinder is 47.89 m/s2 and the allowable years for operating the grinder are less than one. The simulation results indicate that the finite element model of the vertical disc stump grinder is useful for analyzing the vibration of the handle. The output weighted acceleration of the existing handle of the vertical disc stump grinder is 8.87 m/s2 after optimization, with the allowable years of operation increased to 3 years. Thus, the optimization scheme is feasible.

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