Root Mean Square Acceleration (RMS), Crest Factor and Hand-Arm Vibration Dose Value In Tiller Users
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Abstract
The purpose of this study was to assess exposure to hand-arm vibration in tiller users, Forty users of tiller in northeastern provinces of Iran were examined to measure hand-arm vibration parameters such as root mean square acceleration (RMS), total equivalent acceleration, Vibration Dose Value (VDV) and crest factor in three directions (x, y, and z) and various operating modes for comparing them with the relevant permitted standard levels. The hand-arm vibration measurement was done according to the standards ISO 5349-1 and ISO 5349-2. The obtained results indicated that the exposure level in three modes of rota-tilling, transportation and idling were equal to 16.95, 14.16 and 8.65 m/s2, respectively. In all measurement modes, the exposure to vibration in the direction x was greater than that of y and z. Moreover, the average crest factor was calculated less than six. The highest vibration dose values were measured in rota-tilling mode when the tiller was in 2nd gear (60.76 m/s1.75) and 1st gear (56.83 m/s1.75). The results indicated that the permitted working time was only few seconds and there was a risk of musculoskeletal disorders. The present study emphasizes on the need for interventional and control managerial measures to eliminate or reduce hand-arm vibration transmitted to the tiller users' hands for avoiding major problems such as musculoskeletal disorders, discomfort and premature fatigue. In this regard, further studies are required to identify vibration sources in different types of tillers.
Tewari VK , Dewangan K . Effect of vibration isolators in reduction of work stress during field operation of hand tractor. Biosyst Eng 2009; 103(2); 146-158.
Issever H , Aksoy C, Sabuncu H , Karan A. Vibration and its effects on the body. Med Prin Pract 2003; 12(1); 34-38.
Pourabdian S, Habibi E, Rismanchian M. Effectiveness of anti-vibration handle the amount of vibration generated by the grinder. JHSR 2010 ; 6(1) ; 124-133 (in Persian(
Goglia V, Gospodaric Z, Filipovic D, Djukic I. Influence on operator's health of hand-transmitted vibrations from handles of a single-axle tractor. Ann Agr Env Med 2006; 13(1) ; 28- 33.
Salokhe V, Majumder B, Islam M.Vibration characteristics of a power tiller. J Terramechanics: 1995; 32(4); 181-197.
Dewangan K, Tewari V. Characteristics of vibration transmission in the hand–arm system and subjective response during field operation of a hand tractor. Biosyst Eng 2008; 100(4); 535-546
BSI. Measurement and evaluation of human exposure to whole-body mechanical vibration and repeated shock. BS 6841; 2008
Hostens I , Ramon H. Descriptive analysis of combine cabin vibrations and their effect on the human body. J Sound Vib 2003; 266; 453-464.
ISO. Evaluation of human exposure to whole-body vibration. ISO 2631-1;1997.
Mansfield NJ, Griffin MJ . Non-linearities in apparent mass and transmissibility during exposure to whole-body vertical vibration. J Biomech 2000; 33(8); 933-941.
Paddan G, Griffin M. Effect of seating on exposures to whole-body vibration in vehicles. J Sound Vib 2000; (1) 253; 215- 241.
Wikstrom B, Kjellberg A, Dallner M. Whole-body vibration: a comparison of different methods for the evaluation of mechanical shocks. Int J Ind Ergonom 1991; 7(1); 41-52.
Nassiri P, Mairorid H, Jahangiri M, Rismanhian M and Karimi A.human response to vibration. 1st ed, fanavaran Publishing Co., Iran, tehran 2009 (in Persian).
Nassiri P , Ali Mohammadi I , Beheshti MH, Azam K . Hand-Arm vibration assessment among tiller operator.JHSW 2013; 3(2); 35-46.
HostensI, Ramon H . Descriptive analysis of combine cabin vibrations and their effect on the human body. J Sound Vib 2003; 266(3) ; 453-464.
Griffin M. A comparison of standardized methods for predicting the hazards of whole-body vibration and repeated shocks. J Sound Vib 1998; 215; 883-914.
Tewari V, Dewangan K, Karmakar S. Operator's fatigue in field operation of hand tractors. Biosyst Eng 2004; 89;1-11.
Dewangan K, Tewari V. Vibration energy absorption in the hand-arm system of hand tractor operator. Biosyst Eng 2009; 103; 445-454
Qunging J, Qianhua W, Kuifu C, and Daxing Z. The excitations and characteristics of the vibration of walking tractors handle using isolators. Trans Chinese So AgriMach 1993; 24; 74-79.
Taghizadeh A , Tavkoli T, Ghobadian B. Tiller vibration analysis at station position. JIJAS 2010; 41; 27-35 ) in persian(
Ying Y, Zhang L, Dong M. Vibratory characteristics and hand-transmitted vibration reduction of walking tractor. ASABE1998 ; 41;917-922.
ISO. Mechanical Vibration-Measurement and Evaluation of Human Exposure to Hand-Transmitted Vibration-Part 2: Practical Guidance for Measurement at the Workplace. ISO 5349-2; 2001
Sam B, Kathirval K. Development and evaluation of vibration isolators for reducing hand transmitted vibration of walking and riding type power tillers. Biosyst Eng 2009; 103; 427-437.
| Files | ||
| Issue | Vol 6 No 4 (2014) | |
| Section | Articles | |
| Published | 2015-10-14 | |
| Keywords | ||
| Tiller Hand-arm vibration Hand Tractor Vibration | ||
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