A mathematical model of tractor-occupant system with a new seat suspension for minimization of vibration response

Patil, Mothiram K.; Palanichamy, M. S.

doi:10.1016/0307-904x(88)90024-8

Cited by 47 publications

(19 citation statements)

References 5 publications

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“…[5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Hz; With these assumptions, the experimental data are summarized in Table 1 15) . (2) Measurements with backrest inclined 21F rom 10 subjects having an average mass of 61.1 kg, measurements of 3 transmissibility values were implemented at different locations on the respective bodies seated with backrests inclined 21˚.…”

Section: Basic Assumptionsmentioning

confidence: 99%

“…From the results of a large amount of experimental data, various biodynamic models have been developed to describe human motion. According to different techniques, these models can be grouped as lumped-parameter (LP), finiteelement (FE), and multibody (MB) models.An LP model consists of lumped masses, springs and dashpots [1][2][3][4][5][6][7][8][9][10][11][12][13][14] . A variety of experiments have also been implemented by various researchers under widely varying testing conditions, involving vibration excitations, postural constraints, and subject populations.…”

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confidence: 99%

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Modeling of a Seated Human Body Exposed to Vertical Vibrations in Various Automotive Postures

Liang

Chiang

2008

Ind Health

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IntroductionIn a seated posture, humans are most sensitive to whole-body vibrations under low-frequency excitation; therefore, biodynamic responses of a seated human body when exposed to vertical vibrations have attracted much attention through the years. Moreover, knowledge of the human responses to vibrations requires an understanding the cause-effect relationships among the transmission of vibrations through the body and its health, comfort and performance. These responses have been widely assessed in terms of seat-to-head (STH) transmissibility, drivingpoint mechanical (DPM) impedance, and apparent (AP) mass. The first function refers to the transmission of motion through the body; whereas the other two pertain to the force and motion at the point of vibration input.The human body is a very sophisticated dynamic system whose mechanical properties vary from one moment to another and from one individual to another. From the results of a large amount of experimental data, various biodynamic models have been developed to describe human motion. According to different techniques, these models can be grouped as lumped-parameter (LP), finiteelement (FE), and multibody (MB) models.An LP model consists of lumped masses, springs and dashpots [1][2][3][4][5][6][7][8][9][10][11][12][13][14] . A variety of experiments have also been implemented by various researchers under widely varying testing conditions, involving vibration excitations, postural constraints, and subject populations. These have, therefore, resulted in significant variations between the different data sets generated. In an effort to define generalized values for characterizing the biodynamic responses of a seated body in the most commonly encountered work environments, Boileau et al.

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Section: Basic Assumptionsmentioning

confidence: 99%

mentioning

confidence: 99%

Modeling of a Seated Human Body Exposed to Vertical Vibrations in Various Automotive Postures

Liang

Chiang

2008

Ind Health

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“…Thus it is not a surprise that, such seat suspension designs done without taking the combined effect of the vehicle and crew into account, would not give much benefit. Other surveys done in this area also are in support of this view, which at end stress that combined biomechanical modelling and simulation of parameters of human body and occupant seat, together, is necessary 1 . Accordingly an earlier work was carried out on this by Patil and Palanichamy 1 for typical heavy vehicle viz.…”

Section: Introductionmentioning

confidence: 79%

Comfort Level Refinement of Military Tracked Vehicle Crew through Optimal Control Study

2018

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Military tracked vehicle and crew are modelled together in this paper as integrated man-machine lumped parameter model, by integrating the simplified 5 degrees of freedom (DoF) tracked vehicle model, including seat and 4 DoF human bio-dynamic model, thus resulting in a 9 DoF simplified vehicle-occupant model. Then the natural frequency of major mass segment namely the chassis mass is obtained through simulation study, for a known road input. The value obtained is compared with that of an earlier research work, for validation of said man-machine model. Then focusing our study locally at crew seat location, parameters of crew seat suspension for ride comfort are optimised using the optimal digital state space controller designed for this purpose by implementing it in a 2 DoF occupant -seat suspension model and its Simulink model constructed. Simulation results illustrate the attainment of the goal by meeting the controller design requirements.

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“…Experimental values of accelerations and frequencies which were beyond permissible limits obtained from literature confirmed that vibration certainly affects the health of a motorcycle rider. Palanichamy et al [6] suggested a seven DOF model by adding another set of spring and damper into Muskian's six DOF model (under pelvis) while neglecting the internal forces in the body. Amirouche et al [7] developed a threedimensional computer program to study the biodynamic of human bodies.…”

Section: Introductionmentioning

confidence: 99%

A numerical study for determining the ideal operating speed for a two-wheeler rider on varying terrain amplitudes

2016

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The predominant part of the Indian population generally depends on a two-wheeler for transportation needs. However, very poor road conditions and poor vehicle designs have led to development of pains in the body. The percentage of such incidents involving musculoskeletal pains is alarmingly gaining impetus in the region. Hence, an attempt has been made to analyze and obtain ideal operating conditions of the vehicle for varying terrain amplitudes of 5, 10 and 15 mm, respectively. In this work, a coupled human body and twowheeler is modeled as a lumped parameter system. The composite model is analyzed by computer program (MAT lab) for vertical vibration responses of the different body parts to vertical vibrations inputs that are sinusoidal in nature and applied to wheels of the twowheeler. The numerical analysis is carried out for a Hero Honda splendor vehicle and an average male human body weighing around 80 kilograms. The analysis successfully concludes the torso as the part of the human body that experiences maximum displacement followed by head and thorax for all the terrain amplitudes involved in the study. The study also concludes that the ideal speed of the vehicle to be maintained for the body to experience minimum vibrations is 8 Hz i.e. 49.60 km/hr.

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A mathematical model of tractor-occupant system with a new seat suspension for minimization of vibration response

Cited by 47 publications

References 5 publications

Modeling of a Seated Human Body Exposed to Vertical Vibrations in Various Automotive Postures

Modeling of a Seated Human Body Exposed to Vertical Vibrations in Various Automotive Postures

Comfort Level Refinement of Military Tracked Vehicle Crew through Optimal Control Study

A numerical study for determining the ideal operating speed for a two-wheeler rider on varying terrain amplitudes

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