Stiffening Behavior of Supine Humans during En Route Care Transport
Autor: | Andrew R. Mayer, Guandong Qiao, Rachel Kinsler, Jonathan DeShaw, Salam Rahmatalla |
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Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Physics
Supine position nonlinearity 02 engineering and technology Mechanics acceleration Torso whole-body vibration 01 natural sciences lcsh:QC1-999 Stiffening coherence Vibration Root mean square 020303 mechanical engineering & transports medicine.anatomical_structure 0203 mechanical engineering 0103 physical sciences medicine Whole body vibration transmissibility 010301 acoustics Softening Transmissibility (structural dynamics) lcsh:Physics |
Zdroj: | Vibration Volume 4 Issue 1 Pages 8-100 Vibration, Vol 4, Iss 8, Pp 91-101 (2021) |
ISSN: | 2571-631X |
DOI: | 10.3390/vibration4010008 |
Popis: | Previous studies of human response to whole-body vibration demonstrated nonlinear softening behaviors with increasing vibration magnitudes. Most of these studies were conducted at relatively low vibration magnitudes of less than 3 m/s2 root mean square (RMS), and not much knowledge is available to show if this softening behavior exists when humans are exposed to higher vibration magnitudes. In this work, 26 participants were transported in a supine position inside an army medical vehicle on a road that simulated field scenarios and were exposed to input acceleration magnitudes at 0.60, 0.98, 1.32, 3.25, 5.58, and 5.90 m/s2 RMS. Motion response data were collected at the head, torso, and pelvis of the participants using inertial sensors. Transmissibility and coherence graphs were used to investigate the type of nonlinearity induced under these transport conditions. Participant responses showed softening behavior when the vibration magnitude increased from 0.60 to 0.98 to 1.32 m/s2 RMS. However, this response behavior changed to stiffening when the vibration magnitude increased to 3.25, 5.58, and 5.90 m/s2 RMS. In the stiffening range, the transmissibility of the torso transformed from two dominant peaks to a single peak, which may indicate a tonic muscle behavior. The resulting stiffening behaviors may be considered in the design of transport systems subject to rough terrains. |
Databáze: | OpenAIRE |
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