Reduction of vibrations generated by an impact wrench
Keywords:Atmospheric pressure, Air pressures, Anti-vibration devices, Elastic element, Hand-arm vibration, Ingersoll rands, Lumped parameter, Nonlinear behavior, Static forces, Tool vibrations, Velocity generator, Vibration spectra, Vibration transmissibility
AbstractThe design and the verification of an anti vibration device (AVD) meant to reduce the hand-arm vibration (HAV) transmitted by an impact wrench are described. The tool studied is an impact wrench, the Ingersoll-Rand 3940 P2 Ti, is initially characterized using different operators, postures, air pressures, grip, and push forces. The tool vibration measured both in the field and on a purposely designed workbench show that the non weighted vibration spectra possess components up to 2 kHz. The interaction between the tool and the operator was modeled with the lumped parameter scheme and the characteristics of the velocity generators are identified under the hypothesis of purely inertial tool impedance and with operator impedances. Given the nonlinear behavior of the elastic elements, vibration transmissibility is found to strongly depend on the static forces that the operator exerts on the handles.
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