Effectiveness of substitute vibration dampers in reducing hand-arm vibrations of a gasoline-fueled hand tractor
2016
Yap, M.A.B. | Layaoen, H.D.Z. | Revilla, J.A.D. | Ani, A.C. | Blanco, F.M.M.
The study of the effectiveness of substitute materials used by Filipino farmers as vibration dampers on a gasoline-powered engine and compared these with the results of tests on a diesel-powered engine. Baseline measurements were established at the hand, elbow and shoulder using 2100, 2400, 2700, 3000, 3300, and 3600 revolutions per minute (rpm). Only vibrations at the hand exceeded the exposure limit value of 5 m sup -2 (from NIOSH ISO 5349.2001) at 6.584 m sup -2, 7.628 m sup -2, 8.349 m sup -2, 7.323 m sup -2, 11.756 m sup -2, and 12.189 m sup -2 respectively. Among the five types of substitute handle grips evaluated, air conditioning insulator had the highest reduction in vibration acceleration for gasoline and diesel engine by 47.352% and 22.071%, respectively, while out of the three types of substitute engine mount, car tire sidewalls were the most effective for both engines which reduced vibrations by 30.854% for gasoline engine and by 57.062% for diesel engine. Furthermore, the combined use of 45-mm thick Armacell air conditioning insulator, and car tire sidewalls resulted in the highest reduction of transmitted vibration acceleration by 55.284% (3.702 m sup -2) for gasoline engine by 59.27% (4.759 m sup -2) for diesel engine. With engine speed as block statistical analysis of results for the best combination between gasoline engine and diesel engine showed a significant difference in the vibration reduction: 56.753% (3.691 m sup -2) and 62.360% (4.329 m sup -2), respectively
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