An Improved Biomechanical Model to Optimize Biodynamic Responses Under Vibrating Medium
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ORIGINAL PAPER
An Improved Biomechanical Model to Optimize Biodynamic Responses Under Vibrating Medium Veeresalingam Guruguntla1 · Mohit Lal1 Received: 22 May 2020 / Revised: 30 September 2020 / Accepted: 1 October 2020 © Krishtel eMaging Solutions Private Limited 2020
Abstract Purpose The vibration is a mechanical phenomenon created by man or machine. Persons involved in on/off-road vehicle driving expose to intense vibrations and shocks owing to uneven and asymmetrical terrains. The prolonged vibration exposure may lead to musculoskeletal disorders followed by injuries. To examine human body movements and biodynamic responses precisely, it is obligatory to establish a reliable biomechanical model. Objective To do so, the present paper proposes a ten degrees-of-freedom (dofs) biomechanical model of the seated human. Methods The novelty of the proposed model is that it hypothetically divides the real human structure into segments as a head, thorax, abdomen, pelvis, left upper arm, left forearm, left hand, right upper arm, right forearm, and right hand, respectively, which are mainly missing in the human model developed in past. The mechanical parameters are utilized to define the biomechanical model and optimized through the firefly algorithm. After optimization, the biodynamic responses: seat to head transmissibility, apparent mass and driving point mechanical impedance are calculated for the proposed model and compared with A llen2-dofs model, Wan and S chimmels4-dofs model, Bai et al.4-dofs model, Darling et al.7-dofs model and Boileau et al.experimental. Results and Conclusion The overall goodness of fit is compared for the proposed model with five other models and found that the proposed model gives maximum goodness of fit (93.47). Also, the sensitivity analysis (± 10% variation in mass, stiffness and damping) is performed to validate the reliability of the developed model. And, it is observed that the mass, stiffness, and damping of the pelvis region have a significant role in peak modulus of biodynamic responses. Keywords Human body modeling · Whole body vibration · Biodynamic responses · Firefly algorithm · Optimization · Experimental verification · Sensitivity analysis
Introduction The human body is part of the physical world that is highly sophisticated and has a multifaceted structure, the characteristics of which vary from individual to individual and situation to situation. The interaction of human beings with various tools while performing different activities such as drilling, farming, skiing, construction, etc. leads to discomfort due to vibration [1]. The experimental studies [2–7] evidenced that human beings possibly injure or feel * Mohit Lal [email protected]; [email protected] Veeresalingam Guruguntla [email protected] 1
Department of Industrial Design, National Institute of Technology Rourkela, Rourkela, Odisha 769008, India
discomfort due to vibration. A strong association between human discomfort in different work activities (reading, writing, drinking, and sketchi
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