The vertical driving-point mechanical impedance characteristics applicable to seated vehicle drivers are measured in the 0.625 - 10 Hz frequency range with excitation amplitudes ranging from 1.0 to 2.0 m per s using a whole-body vehicular vibration simulator. The measurements are performed for seated subjects with feet supported and hands held in a driving position. Variations in the seated posture, backrest angle, and nature and amplitude of the vibration excitation are introduced within a prescribed range of likely conditions to illustrate their influence on the driving-point mechanical impedance of seated vehicle drivers. Within the 0.75-10 Hz frequency range and for excitation amplitudes maintained below 4 m per s, a four-degree-of-freedom linear driver model is proposed for which the parameters are estimated to satisfy both the measured driving-point mechanical impedance and the seat-to-head transmissibility characteristics defined from a synthesis of published data for subjects seated erect without backrest support. The parameter identification technique involves the solution of a multivariable optimization function comprising the sum of squared magnitude and phase errors associated with both the mechanical impedance and seat-to-head transmissibillty target values, subject to limit constraints identified from the anthropometric and biomechanical data. The model response, however, is found to provide a closer agreement with the mechanical impedance target values than that with the seal-to-head transmissibility. From the model, the main body resonant frequencies computed on the basis of both biodynamic response functions are found to he within close bounds to that expected for the human body.


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    Title :

    Whole-body vertical biodynamic response characteristics of the seated vehicle driver. Measurement and model development


    Contributors:
    Boileau, P.E. (author) / Rakheja, S. (author)

    Published in:

    Publication date :

    1998


    Size :

    24 Seiten, 12 Bilder, 3 Tabellen, 28 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English