Abstract
The dynamic of human body with three-dimensional (3D) anatomical structure is not considered in the vehicle system dynamics. Moreover, the dynamic of the lumbar spine is not studied in the finite element (FE) model of the seated human, and the influence of external conditions on it is not considered. The aim of the study is to propose a comprehensive dynamic model and an analysis method to study the dynamic of the lumbar spine in a complex system. It is investigated by extracting the first six modals of different lumbar spine FE models (eight models), and the dynamic responses of the lumbar spine under white noise excitation are analyzed by random response method. It is found that the mode deformation and the resonant frequencies of the lumbar spine in vivo and vitro model are significantly different, and the peak response value of the lumbar spine is at the resonant frequency. It is concluded that the influence of vibration on the lumbar spine could be more comprehensively and visually studied by analyzing the displacement response power spectrum of FE model of the seated human body. This study provides a new method and reference for the subsequent study of the vibration behavior of the lumbar spine in complex system (especially in vehicle system dynamics), and the finding is helpful for us to find more and better protection methods of human body.
Highlights
The vibration, excited by road surface and transmitted to the human body through the car tires, suspensions, and seat, has an adverse effect on human health and causes diseases such as lower back pain [1]–[4]
In order to study the mechanism of lower back pain and investigate the protective effect of vehicles on the human body, it is necessary to use the human body as a flexible body to study the mechanical behavior of the lumbar spine in the vehicle system and investigate the interaction between the human body and the vehicle
The analysis found that the upper body mass, upper body moment of inertia, muscle soft tissue, internal organs and upper spine model have different influences on the dynamic mechanical behavior of the lumbar spine as descripted in part B of the section III
Summary
The vibration, excited by road surface and transmitted to the human body through the car tires, suspensions, and seat, has an adverse effect on human health and causes diseases such as lower back pain [1]–[4]. In order to reduce the damage of vibration to the human body, many literatures [5], [6] have studied the dynamics of the human body-seat or body-vehicle system. The original vehicle dynamic model only consisted of tires and bodywork, and two-degree-of-freedom model was used to study the dynamic of the vehicle system in which the role of the human body was neglected. To further investigate the dynamics of car seats in vehicle system, many studies have created three-degree-of-freedom dynamic. In order to study the mechanism of lower back pain and investigate the protective effect of vehicles on the human body, it is necessary to use the human body as a flexible body to study the mechanical behavior of the lumbar spine in the vehicle system and investigate the interaction between the human body and the vehicle
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