摘要
为了研究振动频率对坐姿人体局部舒适性的影响,开展了人体最不适部位主观评价测试,依据主观评价结果构建了振动频率-人体部位舒适感的层次树,定量分析了定义于3.15~31.50 Hz范围内各个三分之一倍频程中心频率的振动激励对于局部不适感的贡献.随后进行了全身振动下人椅界面-人体局部传递率测试,关注传递率的频率峰值与局部不适感敏感频率的对应关系.在不同振动强度下拟合多个局部的振动不适感与全身不适感的数学关系,得到各局部不适感对全身不适感的贡献度.结果表明:全身振动下,坐姿人体“最不适”部位受振动频率影响显著,且这种频率敏感特性对振动强度不敏感.31.50 Hz以下振动造成的不适感主要集中在头部、胸部和腹部,头部对10.00~25.00 Hz的振动具有更明显的不适感,胸部和腹部分别对3.15~5.00 Hz和5.00~8.00 Hz的振动更敏感.即使人体各部位敏感频率不同,但都与座椅至该部位的传递率峰值频率接近,这表明了人体局部主客观响应间的对应关系.进而可以通过层次分析法得到分别适用于头部、胸部和腹部的频率权重.输入人体的振动激励经该计权处理后可反映坐姿人体垂向振动下的局部舒适度水平,从而为舒适性设计提供指导.
To investigate the effect of frequency on the local discomfort of the seated human body under whole-body vibration,the evaluation of subjective discomfort was performed with 19 subjects.A hierarchical tree of vibration frequency to local discomfort was created,and the contribution of each frequency in 3.15—31.50 Hz was analyzed quantitatively.The transmissibilities from the seat surface to body parts were investigated,and the relation between its peak frequency and the sensitive frequency of local discomfort was elucidated.The contribution of each local part was obtained by fitting the local discomfort and the whole-body discomfort under different vibration intensities.The results revealed that during whole-body vibration,the most uncomfortable body part is determined by the vibration frequency,and the vibration intensity has little effect on it.The discomfort caused by vibrations below 31.50 Hz is primarily concentrated in the head,chest,and abdomen,which are the most uncomfortable part of vibrations in the range of 10.00—25.00 Hz,3.15—5.00 Hz,and 5.00—8.00 Hz,respectively.The most sensitive frequencies of various body parts differed,but they all correspond to the peak frequency detected at the transmissibility.This confirms the corresponding relation between the subjective and objective responses of the local human body.Thus,the frequency weightings of different human body parts can be obtained using the analytic hierarchy process.The local vibra tion discomfort can be assessed using weighted acceleration,which can then be used as a reference for comfort design.
作者
林杰威
李蒙
郭智
林泽峰
张俊红
Lin Jiewei;Li Meng;Guo Zhi;Lin Zefeng;Zhang Junhong(School of Mechanical Engineering,Tianjin University,Tianjin 300072,China;Tianjin Ren’ai College,Tianjin 300072,China)
出处
《天津大学学报（自然科学与工程技术版）》
EI
CAS
CSCD
北大核心
2024年第5期482-488,共7页
Journal of Tianjin University：Science and Technology
基金
国家自然科学基金青年科学基金资助项目(51705357)
中国博士后科学基金资助项目(2021T140519).
关键词
全身振动
局部振动
坐姿人体
振动不适感
传递率
频率计权
whole-body vibration
vibration of local parts of human body
seated human body
vibration discomfort
transmissibility
frequency weighting
