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[ subject:"Health Sciences, Recreation." ]
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Comparison of leg spring characteris...
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Watanatada, Pasakorn.
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Comparison of leg spring characteristics during running using mass-spring-damper modeling.
紀錄類型:
書目-語言資料,印刷品 : Monograph/item
正題名/作者:
Comparison of leg spring characteristics during running using mass-spring-damper modeling./
作者:
Watanatada, Pasakorn.
面頁冊數:
173 p.
附註:
Adviser: Gerald A. Smith.
Contained By:
Dissertation Abstracts International62-08B.
標題:
Health Sciences, Recreation. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3024392
ISBN:
0493353666
Comparison of leg spring characteristics during running using mass-spring-damper modeling.
Watanatada, Pasakorn.
Comparison of leg spring characteristics during running using mass-spring-damper modeling.
- 173 p.
Adviser: Gerald A. Smith.
Thesis (Ph.D.)--Oregon State University, 2002.
During heel-toe running, the vertical ground reaction force (VGRF) profile has both impact and active peaks. Although the mass-spring model (a single mass and a linear spring) is simple and useful to predict running characteristics, its simulation of VGRF profiles produces only a single peak rather than the double peak typically observed in running. In contrast, the mass-spring-damper model (two masses, two springs and a damper) produces a simulated force profile with two separate peak values.
ISBN: 0493353666Subjects--Topical Terms:
1018003
Health Sciences, Recreation.
Comparison of leg spring characteristics during running using mass-spring-damper modeling.
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During heel-toe running, the vertical ground reaction force (VGRF) profile has both impact and active peaks. Although the mass-spring model (a single mass and a linear spring) is simple and useful to predict running characteristics, its simulation of VGRF profiles produces only a single peak rather than the double peak typically observed in running. In contrast, the mass-spring-damper model (two masses, two springs and a damper) produces a simulated force profile with two separate peak values.
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Running barefoot versus with shoes of varying stiffness produces VGRF profiles with quite different characteristics. The purpose of this study was to use the mass-spring and mass-spring-damper models to investigate the stiffness characteristics of human running in barefoot, hard-shoe and soft-shoe conditions. Ten recreational runners ran overground at 3.83 m/s and completed five trials of each footwear condition. Force data and two-dimensional kinematic data were recorded simultaneously at 1000 and 250 Hz respectively. Using the mass-spring model, vertical stiffnesses with the barefoot, hard-shoe and soft-shoe conditions were 27.6, 25.3 and 24.6 kN/m, respectively. Hard-shoe and soft-shoe material stiffnesses were about 150 and 100 kNm<super>−1</super>. Considering the leg and shoe as two springs in series, the leg's actual vertical stiffness could be estimated as 30 and 33 kNm<super>−1</super> for hard and soft-shoe conditions. The result suggested that runners increased their actual vertical stiffness with the sequence of barefoot, hard-shoe, and soft-shoe conditions.
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Using the mass-spring-damper model, the upper spring stiffness was relatively constant while the lower spring stiffness changed with footwear condition: 274, 136 and 126 kN/m, respectively. While it is mathematically convenient to model the leg and body with constant spring characteristics over time, physiologically it is likely that muscle-tendon stiffness does change during stance as muscle activity changes. This suggests that mass-spring models of running would be improved by time varying spring characteristics. Variable stiffness of the simple mass-spring model was tested using a smoothly varying stiffness function. This provided a significantly better force profile simulation for each of the footwear conditions than did the constant stiffness model. Further mass-spring-damper modeling may also be improved through incorporation of such time varying characteristics.
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http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3024392
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