<p>Understanding vibration transmission through human body is important to design integrated human–machine systems and vibration mitigation devices to reduce problems associated with vibration. Vertical whole-body vibration (WBV) in normal standing posture was investigated to inform exposure mitigation. Vibration transmission from the platform to body segments was studied for single subject at various accelerations of shaker, and for ten subjects at single acceleration of shaker. Vibration transmissibility was determined at frequency range of 3.0–12.0 Hz. The first and second resonance frequency occurs between 4.0–6.0 and 7.0–9.0 Hz, respectively. Peak transmissibility decreases with increase in input acceleration, in general. The transmissibility of body segments of torso and lower limbs increases with body height, segments in increasing order are as follows: lower legs, upper legs, pelvis, 5th lumbar vertebrae, 3rd lumbar vertebrae, 12th thoracic vertebrae and 8th thoracic vertebrae (T8). The peak transmissibility of head and neck is lower than T8, there is an exception for females where peak for pelvis is higher than lumbar vertebrae. The transmissibility is highest for T8 and upper limb segments and lowest for lower limb segments, in general. Overall, average peak transmissibility is 3.57, maximum is 4.50 for T8 and minimum is 2.04 for lower legs. The findings provide comprehensive map of WBV transmission to body segments and revealed that exposure in human–machine systems should be minimized for frequency range between 4 and 10 Hz, and vibration isolation should be employed at platform-foot interface. The results can guide standards and device design to reduce vibration-related risks.</p>

错误:搜索内容不能为空,请输入英文关键词
错误:关键词超出字数限制,请精简
高级检索

Transmission of Vertical Whole-Body Vibration Through the Human Body for Normal Standing Posture

  • Zia ul Rehman Tahir,
  • Parthasarathi Mandal,
  • Muhammad Azhar,
  • Muhammad Taimoor Adil,
  • Ghulam Murtaza,
  • Hassan Irshad Bhatti

摘要

Understanding vibration transmission through human body is important to design integrated human–machine systems and vibration mitigation devices to reduce problems associated with vibration. Vertical whole-body vibration (WBV) in normal standing posture was investigated to inform exposure mitigation. Vibration transmission from the platform to body segments was studied for single subject at various accelerations of shaker, and for ten subjects at single acceleration of shaker. Vibration transmissibility was determined at frequency range of 3.0–12.0 Hz. The first and second resonance frequency occurs between 4.0–6.0 and 7.0–9.0 Hz, respectively. Peak transmissibility decreases with increase in input acceleration, in general. The transmissibility of body segments of torso and lower limbs increases with body height, segments in increasing order are as follows: lower legs, upper legs, pelvis, 5th lumbar vertebrae, 3rd lumbar vertebrae, 12th thoracic vertebrae and 8th thoracic vertebrae (T8). The peak transmissibility of head and neck is lower than T8, there is an exception for females where peak for pelvis is higher than lumbar vertebrae. The transmissibility is highest for T8 and upper limb segments and lowest for lower limb segments, in general. Overall, average peak transmissibility is 3.57, maximum is 4.50 for T8 and minimum is 2.04 for lower legs. The findings provide comprehensive map of WBV transmission to body segments and revealed that exposure in human–machine systems should be minimized for frequency range between 4 and 10 Hz, and vibration isolation should be employed at platform-foot interface. The results can guide standards and device design to reduce vibration-related risks.