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2021 IEEE International Conference on Robotics and Automation (ICRA), 2021
This paper presents a simulation study of the problem of balancing a planar double pendulum in which the lower body (the leg) has been modified to include a spring-loaded passive prismatic joint. Robots of this kind can travel by hopping, and can also stand and balance on a single point. The purpose of this study is to investigate the degree to which a
Juan D. Gamba, Roy Featherstone
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This paper presents a simulation study of the problem of balancing a planar double pendulum in which the lower body (the leg) has been modified to include a spring-loaded passive prismatic joint. Robots of this kind can travel by hopping, and can also stand and balance on a single point. The purpose of this study is to investigate the degree to which a
Juan D. Gamba, Roy Featherstone
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Carrying loads with springy poles
Journal of Applied Physiology, 1991People throughout Asia use springy bamboo poles to carry the loads of everyday life. These poles are a very compliant suspension system that allows the load to move along a nearly horizontal path while the person bounces up and down with each step. Could this be an economical way to carry loads inasmuch as no gravitational work has to be done to lift ...
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A flexible and springy form of ice
Science, 2021Single-crystal ice microfibers recover their shape after bending to near their breaking ...
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Ultradrawing of ?springy? polypropylene films
Polymer Bulletin, 1987It is demonstrated that in the process of ultradrawing of semicrystalline polypropylene the morphology of the initial material plays major role. Extremely high draw ratios are obtained (λmax≈50) when drawing “hard elastic” polypropylene films perpendicular to their initial molecular orientation. This behaviour is explained by the molecular processes of
J. Petermann, A. Karbach, K. Felt
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Morphological mechanics of springy polymers
Journal of Polymer Science: Polymer Physics Edition, 1976AbstractThe mechanics of “springy” or “hard elastic” row‐crystallized polymers were investigated. It was found that their unique tensile and physical properties could be explained by adhesive fracture mechanics and simple beam deflection. The deformed lamellae had an apparent negligible modulus of flexural rigidity.
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The mechanical behavior of springy polypropylene
Polymer Engineering & Science, 1975AbstractTo obtain further details of the unusual behavior of the “hard elastic,” “springy” form of polypropylene (SPP), various loading conditions were studied with an Instron model 1130. Specifically, the variation of the elongation at rupture with change in gauge length and strain rate has been determined.
S. L. Cannon +2 more
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Springy Polypropylene: A Novel Elastomeric Biomaterial
International Journal of Polymeric Materials, 1977Abstract Polypropylene has been fabricated into a different molecular morphology which shows the usual stiffness and high strength indigenous to this polymer, but which also exhibits surprising elastic behavior. Fibers and films in this form are extensible to several hundred percent without rupture and yet show nearly complete recovery to their ...
S. L. Cannon, W. O. Statton
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Kinesin's walk: Springy or gated head coordination?
Biosystems, 2009Conventional kinesin (kinesin-1) is a motor protein that performs a vital function in the eukaryotic cell: it actively transports cargo to required destinations. Kinesin pulls cargo along microtubule tracks using twin linked motor domains (heads) that bind the microtubule, hydrolyse ATP, and alternately step forward.
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