Tang Sheng-Jie, Dong Rui-Chun, Cheng Xiang, Liu Yi-Tang, Wang Zong-Liang, Zhang Pei-Biao
School of Mechanical Engineering, Shandong University of Technology, Zibo, PR China.
Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, PR China.
Ergonomics. 2025 Jul;68(7):1067-1079. doi: 10.1080/00140139.2024.2391591. Epub 2024 Aug 16.
Few studies investigate the impact of anterior-posterior excitation frequency on the time-domain vibrational response and injury risk of the lumbar spine in seated individuals. Firstly, this study utilised a previously developed finite element model of an upright seated human body on a rigid chair without a backrest to investigate the modes that affect the anterior-posterior vibrations of the seated body. Subsequently, transient dynamic analysis was employed to calculate the lumbar spine's time-domain responses (displacement, stress, and pressure) and risk factors under anteroposterior sinusoidal excitation at varying frequencies (1-8 Hz). Modal analysis suggested the frequencies significantly affecting the lumbar spine's vibration were notably at 4.7 Hz and 5.5 Hz. The transient analysis results and risk factor assessment indicated that the lumbar responses were most pronounced at 5 Hz. In addition, risk factor assessment showed that long-term exposure to 8 Hz vibration was associated with a greater risk of lumbar injury.
很少有研究调查前后向激励频率对坐姿个体腰椎的时域振动响应和损伤风险的影响。首先，本研究利用先前开发的无靠背刚性座椅上直立坐姿人体的有限元模型，来研究影响坐姿人体前后向振动的模式。随后，采用瞬态动力学分析来计算腰椎在不同频率（1 - 8Hz）的前后向正弦激励下的时域响应（位移、应力和压力）及风险因素。模态分析表明，对腰椎振动有显著影响的频率分别为4.7Hz和5.5Hz。瞬态分析结果和风险因素评估表明，腰椎响应在5Hz时最为明显。此外，风险因素评估显示，长期暴露于8Hz振动会增加腰椎损伤的风险。
