Characteristics of vibration transmission in the hand–arm system and subjective response during field operation of a hand tractor

摘要: Hand–arm vibration, which is transmitted from the handle to hands, arms and shoulders, causes discomfort operator results in early fatigue. An investigation was conducted determine transmission of vibration hand tractor metacarpal, wrist, elbow acromion operators under actual field conditions during transportation on a tarmacadam road, rota-tilling dry land rota-puddling wet condition. aluminium adapter designed developed measure hand–arm system operators. Parameters such as frequency-unweighted frequency-weighted acceleration root mean square (rms) work-related body pain (WRBP) were evaluated. The transmissibility computed for various operations. indicate that posture operation influenced transmissibility. maximum observed with values 0.91, 0.47, 0.30 0.21 at acromion, respectively. corresponding 0.89, 0.44, 0.24 0.12 0.85, 0.43, 0.22 0.18. Resonance metacarpal frequency range 31.5–100 Hz. High-frequency (100–1250 Hz) primarily localised hands. magnitude amplified dominant axis i.e. X-axis operation. average X, Y Z axes be 1.01, 0.84 0.88, respectively, rota-tilling. WRBP operation, followed by rota-puddling. Maximum level 4.9, 3.7 3.3 (Borg, CR—10 scale) wrist 4.3, 3.5 2.6 (Borg rota-tilling, operations, Vibration correlate well (r2=0.81) compared (r2=0.36) (r2=0.44).