Investigation of the 3-D vibration transmissibility on the human hand-arm system using a 3-D scanning laser vibrometer
Keywords:Damage detection, Resonance, 3D-scanning, Biodynamic response, Frequency ranges, Function of frequency, Hand-arm system, Measurement locations, Orthogonal directions, Random vibrations, Transmissibility functions, Vibration controller, Vibration test system, Vibration transmissibility
AbstractThe vibration transmissibility on the human hand-arm system subjected to vibrations in three orthogonal directions was investigated. Seven healthy male subjects participated in the study and the experiment was carried out on a novel 3-D vibration test system. The vibration controller was programmed to generate broadband random vibration in the frequency range of 16-500 Hz along each direction. The measured tri-axial transmissibility functions are found to vary among the subjects and their basic distributions of the transmitted vibration on the hand-arm system are similar. The magnitudes of the tri-axial transmissibility measured at six important locations on the hand-arm system of the subject show that transmissibility is a function of frequency. which varied greatly with measurement location and vibration direction. The resonances observed at the wrist, elbow, and shoulder are consistent with the first resonance observed in the driving-point biodynamic response in each corresponding direction.
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