Active Vibration Control To Attenuate Hand-Arm Vibration For Orbital Sander
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Date
2012-10
Authors
Ahmad Mazlan, Ahmad Zhafran
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Prolonged use of the orbital sander with high vibration level can lead to the hand-arm vibration syndrome (HAVs). In order to evaluate the attenuation of the hand-arm vibration when using the orbital sander, dynamic analysis of the orbital sander is carried out using coupled orbital sander-hand-arm model subjected to the active vibration control (AVC) pad. The orbital sander is modelled as a three-degree-of-freedom system where the values of the modal mass, stiffness and damping are derived from the experimental modal analysis and the single-degree-of-freedom of Reynolds and Soedel model is chosen to represent the hand-arm system. Various control schemes are applied in the AVC system including proportional-derivative (PD) and active force control (AFC) techniques. The design parameters analyzed include the sensor and the actuator locations and the modelling approach. Two disturbances are created for the system where the first disturbance is measured from the orbital sander operating condition and the second disturbance is modelled as a sine wave to test the robustness of the control schemes. The simulation result shows that the control scheme with AFC input produces a superior result even though under the influence of external disturbance with a reduction of 99.20 % of hand-arm vibration compared to the classical PD controller which reduces only 88.36 % of hand-arm vibration. The results also proved that the AVC pad is an effective way of achieving a low hand-arm vibration for the orbital sander.
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Keywords
Hand-arm vibration for orbital sander