The Dynamics Of Quadrupedal Walking

摘要: The cat was used as a representative quadruped for study of the action locomotor apparatus in walking. In analysis body considered being made up eleven parts behaving such fashion that they could be rigid bodies. weight each part determined, position its centre gravity and also moment inertia. Moving pictures were taken walking over specially constructed platform which recorded pressure exerted by foot during stride. photographs various at successive instants. These records analysed terms displacement, velocity acceleration whole, parts. A comparison vertical forces acting on single limbs walk shows reactions are greater forelimbs. This is not only due to location nearer forelimbs, but result thrust produced forelimb largely responsible an upward mass body. Horizontal forefeet tend than those hind. When horizontal impulse whole step considered, it shown forelimbs produce more retarding action, while hindlimbs contribute forwarding arrangement steps fore- antagonistic, thus damping fluctuations with probable saving energy expenditure. kinetic body, derived from data separate parts, maintains average level undergoes cyclical changes possible transfer into gravitational potential can account these thought involve muscle action. An relationship between about joints reaction co-operate movement individual segment allows calculation resultant torque segment. provided actual measurements total any instant. Correlation torques definite groups indicates roughly manner muscles function quadrupedal