An active head–neck model in whole-body vibration: Vibration magnitude and softening

Rahmatalla, Salam; Liu, Ye

doi:10.1016/j.jbiomech.2012.01.022

Cited by 15 publications

(9 citation statements)

References 27 publications

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“…This work presents one-link passive and muscle-based models with the capability of predicting human head-neck motion under fore-aft and multiple-axis input vibration when the person is taking different postures. The results indicate that the passive and muscle-based models were able to reasonably predict the resulting motion of the HNS for the postures under consideration; however, a model of the head-neck was improved in this work by taking muscle activity into account, which was consistent with the literature (Zadpoor and Nikooyan, 2010;Rahmatalla and Liu, 2012).…”

Section: Conclusion and Discussionsupporting

confidence: 77%

“…Only a handful of planar human models under fore-aft WBV are presented in the literature. Rahmatalla and Liu (2012) proposed a 1-DOF head-neck model using control theory and optimization schemes. Fard (2003aFard ( , 2003bFard ( , and 2004 proposed linear planar models with 1 DOF and 2 DOF to predict the human head-neck motion.…”

Section: Seated Positionmentioning

confidence: 99%

“…Previous studies showed a few active models that consider muscle activity. Some of these models add a feedback using control theory (Peng, Hain et al, 1996;Rahmatalla and Liu, 2012). Peng et al (1996) presented a control system model with neural feedback controller representing the vestibulocollic and the cervicocollic reflexes (Peng, Hain et al, 1996).…”

Section: Seated Positionmentioning

confidence: 99%

“…Peng et al (1996) presented a control system model with neural feedback controller representing the vestibulocollic and the cervicocollic reflexes (Peng, Hain et al, 1996). Another model used an active damper to represent the muscle activities to simulate the response with different magnitudes input signals (Rahmatalla and Liu, 2012).…”

Section: Seated Positionmentioning

confidence: 99%

“…While the non-linearity of the human biodynamic and the softening behaviors have been investigated experimentally by several researchers, the work has still mainly focused on the spine area of the human body (Huang and Griffin, 2009;Mansfield and Griffin, 2000). To the author's knowledge, there is only one study that investigates the nonlinearity of the cervical spine response under different vibration magnitudes (Rahmatalla and Liu, 2012). In addition to affecting the capability of the human model to predict human response at different vibration magnitudes, the nonlinearity in human response and the softening behavior play a significant role on the design of vibration suppression systems in seats.…”

Section: Excitations At Different Magnitudesmentioning

confidence: 99%

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Passive and muscle-based predictive computer models of seated and supine humans in whole-body vibration

Wang¹

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Studies in human response to whole-body vibration, such those encountered in heavy machinery and ground and aerial transportation, have highlighted the critical role of the head-neck posture of seated human occupants and the role of the transport system of a supine human on the severity of the transmitted vibration to the human body. Novel passive and muscle-based models are introduced in this work to predict the biodynamical response of the human under whole-body vibration in seated and supine postures. Planar and three-dimensional models representing the human head-neck system under different seated postures and fore-aft and multiple-axis whole-body vibration are first introduced. In these models, the head-neck system is represented by rigid links connected via spring-damper components representing the soft-tissue and connecting elements between the bones. Additional muscle components are added to some models. The muscle components comprise additional mass, spring, and damper elements arranged in a special order to capture the effect of changes in the displacement, velocity, acceleration, and jerk. The results show that the proposed models are able to predict the displacement and acceleration of the head under different vibration files, with the musclebased models showing better performance than the passive models. The second set of models is introduced in this work to investigate the effect of the underlying transport system conditions on the response of supine humans under vertical and multiple-axis whole-body vibration. In these models, the supine-human body is represented by three rigid links representing the head, torso/arms, and legs. The links are connected via rotational and translational joints, and therefore, it is expected that the models can capture the coupling effects between adjacent segments. The joints comprise translational and rotational spring-damper components that represent the soft tissue and the connecting elements between the segments. The contact surfaces between the supine vi 3.3.4 Solution Approach .

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Section: Conclusion and Discussionsupporting

confidence: 77%