Abstract
Comparison of three-dimensional (3D) acceleration between ambulance transport and helicopter one and effect of the helicopter transport on human body are discussed. The 3D accelerations of the helicopter and the ambulance are measured using 3D accelerometer and its characteristics are evaluated using frequency distribution, discrete Fourier transform, statistical approach and exposure limit introduced by ISO2631. The experimental results suggest that the effect of the horizontal acceleration of helicopter on the human body is smaller than the ambulance while the vertical acceleration of the helicopter is large in the frequency domain of below 1[Hz] and is expected to provoke motion sickness. Moreover, hovering causes body resonance of the whole body of helicopter around 25[Hz] and huge acceleration which approaches the exposure limit of reduced comfort boundary for one hour.
