Posture-related change in frequency weightings derived from vibration power absorption of the hand-arm system
Keywords:Ergonomics, Experiments, Arm posture, Forearm pronation, Frequency ranges, Frequency weightings, Hand-arm system, Hand-arm vibration, Power absorption, Power spectrum density, Pseudo random, Single-axis, Vibration signal, Weighting factors
AbstractThe effects of hand-arm on the frequency weightings derived from the vibration power absorption (VPA) of the hand was examined. Five arm posture conditions that consist of two elbow postures, horizontally stretched straight and bent by 90 degrees, in combination with three forearm postures such as pronated, neutral, and supinated, are considered. The experiments were performed with twelve healthy male subjects in their twenties and a single-axis hand-arm vibration test system was used that included an electro-dynamic shaker that can generate vibrations. The vibration signal used in the experiments was a pseudo-random vibration in the frequency range of 10 Hz to 1,250 Hz with a flat power spectrum density (PSD) of 1.0. At frequencies ranging from 40 to 125 Hz, forearm pronation is statistically significant for the neutral/supinated forearm posture. Under the elbow-stretched postures, the VPA-based weighting factors were significantly lower than the ISO weighting factors at frequencies ranging from 12.5 to 1,000 Hz.
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