Mechanical Impedance of Supine Humans under Sustained Acceleration
Abstract
Measurements of the mechanical impedance of the supine human body were conducted to investigate the nonlinearities of the body system. A hydraulically driven shake table was installed on a centrifuge. Transmitted force and the acceleration of the platform, on which the subjects were lying, were recorded in the frequency range of 2Hz-20Hz. Sinusodial acceleration amplitude was held constant at 0.5g. The impedance and phase results show that sustained acceleration up to +5Gx stiffens the human body with increasing Gx and shifts the resonance frequency from6Hz under normal gravity to 8Hz under +2Gx and further up to 11Hz, 13Hz and 15 Hz under +3Gx, +4Gx and +5Gx respectively. The modulus of impedance grows with centrifuge acceleration. These results show that the human body behaves nonlinearly in an extreme dynamic environment.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1973
- Accession Number
- AD0760613
Entities
People
- E. May
- H. E. Krause
- H. Hohlweck
- L. H. Vogt