振動環境下における妊婦と胎児の振動特性に関する理論的および実験的研究

The purpose of this study is to investigate the effects of vibrational environment on the vibration characteristic of a pregnant woman and a fetus. As an example of vibrational environment, we have investigated the vibration characteristic of a pregnant woman riding in a running bus on a road with a surface roughness. The mathematical model has 23 degrees of freedom. The human model, with 13 masses, has 13 degrees of freedom, while the vehicle model has 10 degrees of freedom. The model is composed of springs, dampers and masses. The effects of posture such as standing or seating and the damping characteristic of shoes are calculated by a computer simulation system, which was developed in this research. The experimental model, which is made from silicon rubber, is investigated to identify the parameter of fetus in the womb. Some measurement and calculated results are presented in the form of parametric graphs and tables.