Abstract
To provide reference and theoretical guidance for establishing human body dynamics models and studying biomechanical vibration behavior, this study aimed to develop and verify a computational model of a three-dimensional seated human body with detailed anatomical structure under complex biomechanical characteristics to investigate dynamic characteristics and internal vibration behaviors of the human body. Fifty modes of a seated human body were extracted by modal method. The intervertebral disc and head motions under uniaxial white noise excitation (between 0 and 20 Hz at 1.0, 0.5 and 0.5 m/s2 r.m.s. for vertical, fore-aft and lateral direction, respectively) were computed by random response analysis method. It was found that there were many modes of the seated human body in the low-frequency range, and the modes that had a great impact on seated human vibration were mainly distributed below 13 Hz. The responses of different positions of the spine varied greatly under the fore-aft and lateral excitation, but the maximum stress was distributed in the lumbar under different excitations, which could explain why drivers were prone to lower back pain after prolonged driving. Moreover, there was a large vibration coupling between the vertical and fore-aft direction of an upright seated human body, while the vibration couplings between the lateral and other directions were very small. Overall, the study could provide new insights into not only the overall dynamic characteristics of the human body, but also the internal local motion and biomechanical characteristics under different excitations.
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Acknowledgements
Thank Toyota Motor Corporation for its support of human body data and modeling.
Funding
This work was supported by National Natural Science Foundation of China (52005305, 52305119), Natural Science Foundation of Shandong Province (ZR2019BEE071, ZR2020ME157, ZR2021QE203), and China Postdoctoral Science Foundation (2019M652443).
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DRC and CX contributed to conceptualization; DRC, GX, and WZL contributed to methodology; DRC and ZS contributed to formal analysis and investigation; DRC, ZS, and WY contributed to writing—original draft preparation, review and editing; DRC contributed to supervision. All authors contributed to the manuscript revision and read and approved the submitted version.
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Dong, R., Zhu, S., Cheng, X. et al. Study on the biodynamic characteristics and internal vibration behaviors of a seated human body under biomechanical characteristics. Biomech Model Mechanobiol (2024). https://doi.org/10.1007/s10237-024-01849-z
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DOI: https://doi.org/10.1007/s10237-024-01849-z