Abstract
In vehicle systems or construction machinary occupational drivers might expose themselves to vibration for a long time. This may cause illness of the spine such as low back pain. Therefore, it is necessary to evaluate the influence of vibration to the spinal column. For the purpose, the vibration experiment is conducted, and the response of the spinal column is measured in detail. Modal parameters of upper human bodies are identified by using measured transmissibilities. As the results, three modes are observed in 4Hz to 20Hz. Additionally, the average method of human transmissibilities is examined.
