Ground Transportation Systems

Ahmed, A. K. W.

doi:10.1006/rwvb.2001.0165

Cited by 7 publications

(11 citation statements)

References 2 publications

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“…The passenger car parameters are taken from the work by Ahmed. 22 The dynamic analysis is carried out in the frequency domain using the equations of motion derived using Newton's second law for the proposed coupled human-vehicle vibratory model. The resulting equations of motion are written in the matrix form…”

Section: Dynamic Behaviour Of the Coupled Human-vehicle Modelmentioning

confidence: 99%

“…In the present paper, a 15-DOF lumped-parameter model of the human-seat system is developed and is coupled with a 7-DOF model of a passenger car taken from the literature. 22 The ride behaviour of the driver coupled with the vehicle is validated for the ride comfort criteria using the ISO-2631:1997 14 standard, and further parametric analysis is carried out to improve the ride comfort of the driver.…”

Section: Introductionmentioning

confidence: 99%

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Study of the dynamic behaviour of a human driver coupled with a vehicle

Reddy¹,

Ramakrishna

Ramji

2014

Proceedings of the Institution of Mechanical Engineers, Part D:

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In this paper a 15-degree-of-freedom human-seat vibratory model is developed using anthropomorphic modelling and the model is coupled with a typical seven-degree-of-freedom small passenger car to study the dynamic response of a human driver due to vehicle vibrations. The coupled model is analysed by MATLAB simulation for the ride dynamic behaviour of the human driver under a harmonic input excitation in the frequency range 0-40 Hz. The ride behaviours in terms of the vertical accelerations of different segments of the human driver are compared with respect to the ride comfort using the ISO 2631-1:1997 standard. Further, parametric analysis is carried out to improve the ride comfort of the human driver.

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Section: Dynamic Behaviour Of the Coupled Human-vehicle Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of the dynamic behaviour of a human driver coupled with a vehicle

Reddy¹,

Ramakrishna

Ramji

2014

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…Numerous papers were introduced which present sophisticated models of nonlinear suspension springs and dampers [9], [12], [16]. In the current paper, relation between suspension model (Equations 1 -7) and a certain suspension element is described by relation coefficient r.…”

Section: B Modelling Of Nonlinear Vehicle Suspension Elementsmentioning

confidence: 99%

“…Masses correspond to the vehicle body, underbody and vehicle wheels. Generally, models of vehicle dynamics can be classified as quarter-car, half-car [3], [8] (example of an actual object [8]) and full-car [9] models, as summarized by Hrovat [10]. The quarter-car model maps vertical dynamics of the quarter vehicle part.…”

Section: Introductionmentioning

confidence: 99%

“…Half-car and full-car models additionally take into account rotation of the vehicle body in space. Models presented in [3], [8], [9] and [10] are linear and appropriate if roll and pitch rotation angles of the vehicle body are negligibly small and all suspension elements are linear. More precise model, which is correct for full range of rotation angles, was presented by Lagraa et al [11].…”

Section: Introductionmentioning

confidence: 99%

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Modelling and identification of magnetorheological vehicle suspension

Krauze

2012

2012 17th International Conference on Methods &Amp; Models in Automation &Amp; Robotics (MMAR)

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The paper presents methods of estimation of vehicle suspension system parameters based on kinetic measurements. The vehicle suspension is assumed to include springs, linear dampers and magnetorheological (MR) dampers which are known to be nonlinear. In many cases hysteresis loop is revealed in the static characteristics of MR dampers. Nonlinear full-car vehicle suspension model is defined and adapted for using linear and nonlinear leastsquares identification method. Identifications experiments are performed assuming limited number of available kinetic sensors. Solution space with respect to the location of the vehicle body's gravity center is presented as well as quality index values and time diagrams are reported based on estimated model parameters and simulation results. nonlinear vehicle suspension system; full-car model; magnetorheological damper; least-squares method

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Ride comfort and segmental vibration transmissibility analysis of an automobile passenger model under whole body vibration

Guruguntla

Lal

Ghantasala

et al. 2023

Sci Rep

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The examination of seated occupants’ ride comfort under whole-body vibration is a complex topic that involves multiple factors. Whole-body vibration refers to the mechanical vibration that is transmitted to the entire body through a supporting surface, such as a vehicle seat, when traveling on rough or uneven surfaces. There are several methods to assess ride comfort under whole-body vibration, such as subjective assessments, objective measurements, and mathematical models. Subjective assessments involve asking participants to rate their perceived level of discomfort or satisfaction during the vibration exposure, typically using a numerical scale or questionnaire. Objective measurements include accelerometers or vibration meters that record the actual physical vibrations transmitted to the body during the exposure. Mathematical models use various physiological and biomechanical parameters to predict the level of discomfort based on the vibration data. The examination of seated occupants ride comfort under whole-body vibration has been of great interest for many years. In this paper, a multi-body biomechanical model of a seated occupant with a backrest is proposed to perform ride comfort analysis. The novelty of the present model is that it represents complete passenger by including thighs, legs, and foot which were neglected in the past research. A multi-objective firefly algorithm is developed to evaluate the biomechanical parameters (mass, stiffness and damping) of the proposed model. Based on the optimized parameters, segmental transmissibilities are calculated and compared with experimental readings. The proposed model is then combined with a 7-dofs commercial car model to perform a ride comfort study. The ISO 2631-1:1997 ride comfort standards are used to compare the simulated segmental accelerations. Additionally, the influence of biomechanical parameters on most critical organs is analyzed to improve ride comfort. The outcomes of the analysis reveal that seated occupants perceive maximum vibration in the 3–6 Hz frequency range. To improve seated occupants' ride comfort, automotive designers must concentrate on the pelvis region. The adopted methodology and outcomes are helpful to evaluate protective measures in automobile industries. Furthermore, these procedures may be used to reduce the musculoskeletal disorders in seated occupants.

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Ground Transportation Systems

Cited by 7 publications

References 2 publications

Study of the dynamic behaviour of a human driver coupled with a vehicle

Study of the dynamic behaviour of a human driver coupled with a vehicle

Modelling and identification of magnetorheological vehicle suspension

Ride comfort and segmental vibration transmissibility analysis of an automobile passenger model under whole body vibration

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