Abstract
Numerous epidemiological studies have shown that operators who use hand-held power tools are prone to develop hand-arm vibration syndrome. Therefore, it is necessary to reduce the tool vibrations to protect the worker’s health. This research focuses on the dynamic modeling and the vibration simulation of orbital sanders which are commonly used in industrial sectors. The mathematic model with eighteen degrees-of-freedom (DOF) of this machine is established based upon the Lagrange equation. The experiments are also conducted to test vibrations at the top of the housing where the operators hold the machine. The simulated results are found in good coincidence with the experimental results, and the errors between the experimental results and the simulated values are in acceptable range, which demonstrates the mathematic model in this paper is accurate.
Highlights
Exposure to hand-transmitted vibration arising from hand-held power tools for a long time is more prone to several disorders of the hand and arm, which are collectively termed as hand-arm vibration syndrome (HAVS)
We focus on the optimization of the unbalance to reduce the housing vibrations
This paper focuses on the dynamic modeling and housing vibration simulation of the orbital sander
Summary
Exposure to hand-transmitted vibration arising from hand-held power tools for a long time is more prone to several disorders of the hand and arm, which are collectively termed as hand-arm vibration syndrome (HAVS). It is necessary to decrease tool vibrations to protect the worker’s health from the HAVS [1, 2]. Goglia et al [3] obtained the daily exposure time within the safety limit according to ISO standard. The experiment showed that about 15 % of these tools exceeded the safety limits according to applicable standards [5]. Mazlan and Ripin [6] established a three-degree-of-freedom dynamic model of the orbital sander. An accurate mathematic model with eighteen degrees-of-freedom (DOF) of orbital sanders is proposed, which is time-saving compared with the ADAMS model. The experiment that validates the accuracy of the dynamic model is implemented by testing the acceleration values at the top of housing, and the stiffness values of the bearings are selected with minimum errors between the experiment and the simulation results
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