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An Investigation on the Interactivity between Suspended-load Backpack and Human Gait

An Investigation on the Interactivity between Suspended-load Backpack and Human Gait

Xu Xu
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Rome et al. proposed a suspended-load backpack to scavenge energy through human walking. The relative movement between the load and the backpack frame can generate up to 7 watt of electrical power. The aim of this study was to build a physical model for such a backpack which is capable of predicting the amount of the scavenged energy and the ground reaction force based on different walking speeds and load weight, and to evaluate the effects of the suspended-load backpack on the temporal and kinetic parameters of human gait.;The proposed physical model was a combination of an inverted pendulum model and a base excitation model, which, respectively, describe the oscillation of the torso during walking and the oscillation of the load excited by the movement of the torso. The index representing the scavenged energy in this model was the relative velocity between the load and the backpack frame. The model showed that the amount of scavenged energy and the ground reaction force are not monotonic with the walking speed and the load weight. The monotonicity depended on the damping coefficient of the backpack system.;An experiment was conducted to validate the accuracy of the model and to examine the effects of the suspended-load backpack on the human gait. Ten male subjects carrying a suspended-load backpack walked on a treadmill. The movements of the torso and the load were captured. The temporal and kinetic gait parameters were recorded. The results showed that there was an agreement between the experiment data and the predicted value from the model, where the absolute percentage error is 24.2%, with the suspended-load backpack the normalized push-off force decreased when the walking speed increased, which is contradictory to the effect of a conventional backpack on NPOF, and the suspended-load backpack had the same effect as a conventional backpack on cycle time , single support time , double support time , normalized weight acceptance force , and normalized mid-stance force . These results provided some quantitative insight into the movement of the suspended-load backpack during walking and the response of the gait to the suspended-load backpack.
Language
English
Pages
149
ISBN 13
9780549831914

An Investigation on the Interactivity between Suspended-load Backpack and Human Gait

Xu Xu
0/5 ( ratings)
Read Download
Rome et al. proposed a suspended-load backpack to scavenge energy through human walking. The relative movement between the load and the backpack frame can generate up to 7 watt of electrical power. The aim of this study was to build a physical model for such a backpack which is capable of predicting the amount of the scavenged energy and the ground reaction force based on different walking speeds and load weight, and to evaluate the effects of the suspended-load backpack on the temporal and kinetic parameters of human gait.;The proposed physical model was a combination of an inverted pendulum model and a base excitation model, which, respectively, describe the oscillation of the torso during walking and the oscillation of the load excited by the movement of the torso. The index representing the scavenged energy in this model was the relative velocity between the load and the backpack frame. The model showed that the amount of scavenged energy and the ground reaction force are not monotonic with the walking speed and the load weight. The monotonicity depended on the damping coefficient of the backpack system.;An experiment was conducted to validate the accuracy of the model and to examine the effects of the suspended-load backpack on the human gait. Ten male subjects carrying a suspended-load backpack walked on a treadmill. The movements of the torso and the load were captured. The temporal and kinetic gait parameters were recorded. The results showed that there was an agreement between the experiment data and the predicted value from the model, where the absolute percentage error is 24.2%, with the suspended-load backpack the normalized push-off force decreased when the walking speed increased, which is contradictory to the effect of a conventional backpack on NPOF, and the suspended-load backpack had the same effect as a conventional backpack on cycle time , single support time , double support time , normalized weight acceptance force , and normalized mid-stance force . These results provided some quantitative insight into the movement of the suspended-load backpack during walking and the response of the gait to the suspended-load backpack.
Language
English
Pages
149
ISBN 13
9780549831914

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