Abstract.
A method is proposed for identifying the head-neck complex (HNC) in the seated human body when it is exposed to the trunk horizontal (fore-and-aft) vibration. It is assumed that the HNC only has the anteroposterior (flexion/extension) motion in the sagittal plane. An electrohydraulic vibrator is used as a source of vibration. To generate the trunk horizontal vibration, the trunk of the seated subject is fixed to the seatback. The subjects are exposed to the random vibration at a magnitude of 1.60 ms-2 rms (root-mean-square) for 50 s. The coherence and frequency response function are then obtained in the frequency range 0.5–3 Hz. The results show that the HNC behavior is quasilinear with a resonance frequency between 1 and 1.4 Hz. Accordingly, a two-dimensional single-inverted pendulum is considered as a model for the HNC. The frequency domain identification method is then used to estimate the unknown parameters, including the HNC viscoelastic and inertia parameters. The model is examined in a time domain using the random vibration. Good agreement is obtained between experimental and simulation results, indicating the reliability of the proposed method.
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Fard, M., Ishihara, T. & Inooka, H. Identification of the head-neck complex in response to trunk horizontal vibration. Biol. Cybern. 90, 418–426 (2004). https://doi.org/10.1007/s00422-004-0489-z
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DOI: https://doi.org/10.1007/s00422-004-0489-z