Biomechanical model to predict loads on lumbar vertebra of a tractor operator |
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| Affiliation: | 1. AICRP on Farm Implements and Machinery, Central Institute of Agricultural Engineering, Nabi-bagh, Bhopal 462 038, India;2. Agricultural and Food Engineering Department, Indian Institute of Technology, Kharagpur 721 302, India;1. Institute for Agricultural and Earthmoving Machines (IMAMOTER), National Research Council of Italy (CNR), Strada delle Cacce, 73, 10135, Torino, Italy;2. Department of Psychological, Pedagogical and Educational Sciences, University of Palermo, Viale delle Scienze, ed. 15, 90128, Palermo, Italy;1. Department of Food and Energy Systems Science, Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Japan;2. Department of Environmental and Agricultural Engineering, Institute of Agricultural Science, Tokyo University of Agriculture and Technology, Japan;1. Department of Biosystems Engineering, Faculty of Animal Science and Food Engineering (FZEA), University of São Paulo (USP), Av. Duque de Caxias Norte, 225, Pirassununga, SP 13635-900, Brazil;2. Institute of Engineering Polytechnic of Porto, Polytechnic of Porto, Rua Dr. António B. de Almeida 431, 4249-015 Porto, Portugal;1. Department of Biosystems Engineering, University of Mohaghegh Ardabili, Ardabil, Iran;2. Department of Biosystems Engineering, University of Ilam, Ilam, Iran |
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| Abstract: | A biomechanical model is important for prediction of loads likely to arise in specific body parts under various conditions. The biomechanical model was developed to predict compressive and shear loads at L4/L5 (lumbar vertebra) of a tractor operator seating on seats with selected seat pan and backrest cushion materials. A computer program was written to solve the model for various inputs viz. stature and weight of the tractor operators, choice of operating conditions, and reaction forces from seat pan and backrest cushions. It was observed that maximum compressive and shear forces ranged 943–1367 N and 422–991 N, respectively at L4/L5 of tractor operators steering the tractor with leg and hand control actions and occasionally viewing the implement at back. The compressive forces were maximum (1202–1367 N) with coir based composite seat backrest cushion materials (thickness of 80 mm, density of 47.19 kg/m3) and were minimum (943–1108 N) with high density polyurethane foam (thickness of 44 mm, density of 19.09 kg/m3) for the seats.Relevance to industryThe biomechanical model of a tractor operator is important for theoretical understanding the problem of sitting and is also valuable in prediction of compressive and shear loads at L4/L5 of operator under various operating conditions. It will help in design of tractor seat for operator's comfort. |
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| Keywords: | Biomechanical model Tractor Seat Compressive force Shear force |
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