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Dynamic stability of variable stiffness running
2009 IEEE International Conference on Robotics and Automation, 2009Humans and animals adapt their leg impedance during running for both internal(e.g. loading) and external(e.g. surface) changes. In this paper we examine the relationship between leg stiffness and the speed and stability of dynamic legged locomotion. We utilize a torque-driven reduced-order model of running based on a successful family of running robots
Jae Yun Jun, Jonathan E. Clark
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Dynamic stiffness profiles in the left ventricle
Journal of Applied Physiology, 1975Diastolic pressure-volume (P-V) curves were calculated on a beat-to-beat basis in the open-chest, pentobarbital-anesthetized dog, using the technique of direct transmitral flow measurement previously described. P-V curves were constructed and the slope (dP/dV) was plotted vs. pressure and time. dP/dV was used as an index of stiffness in each heart and
A, Kennish, E, Yellin, R W, Frater
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Dynamic stiffness and damping of piles
International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1974Dynamic response of footings and structures supported by piles can be predicted if dynamic stiffness and damping generated by soil–pile interaction can be defined. An approximate analytical approach based on linear elasticity is presented, which makes it possible to establish the dimensionless parameters of the problem and to obtain closed-form ...
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Photoisomerization Dynamics of Stiff-Stilbene in Solution
The Journal of Physical Chemistry B, 2014Photoinduced isomerization of 1,1'-bis-indanyliden (stiff-stilbene) in solution was studied with broadband transient absorption and femtosecond Raman spectroscopies, and by quantum-chemical calculations. Trans-to-cis S1 isomerization proceeds over a 600 and 400 cm(-1) barrier in n-hexane and acetonitrile, respectively. The reaction develops on multiple
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Dynamic Sparsing in Stiff Extrapolation Methods
IMPACT of Computing in Science and Engineering, 1993For the numerical solution of stiff differential equations, extrapolation based on the semi-implicit Euler discretization is considered. Such a method does not need the exact Jacobian of the system -- an approximation is sufficient. A new ``sparsing criterion'' is proposed which eliminates small elements of the Jacobian in order to reduce the amount of
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The dynamic stiffness of an air-spring
2022The measurement of the dynamic stiffness of an air spring identifies a behaviour which up until now is not fully understood. Depending on whether the compression is isothermal or adiabatic the dynamic stiffness differs by a factor of 1.4 for a perfect diatomic gas. The frequency band in which the stiffness increase takes place is determined by the heat
Pelz, Peter F., Buttenbender, Johannes
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Beam length and dynamic stiffness
Computer Methods in Applied Mechanics and Engineering, 1996zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Chen, Yung-Hsiang, Sheu, Jau-Tsann
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Dynamic stiffness and substructures
1993DUE TO COPYRIGHT RESTRICTIONS ONLY AVAILABLE FOR CONSULTATION AT ASTON UNIVERSITY LIBRARY AND INFORMATION SERVICES WITH PRIOR ...
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Dynamic stiffness analysis in tribocontact
Wear, 1987Abstract This paper presents the methodology and results of analysis for pin-on-disc tribosystems for the “dynamic stiffness” between specimen and counterface materials. Dynamic stiffness is defined in terms of the tendency of the contact between pin and disc to be maintained in the event that separation of the triboelements occurs.
Seif, M. A., Moslehy, F. A., Rice, S. L.
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Dynamic stiffness of parabolic cables
Earthquake Engineering & Structural Dynamics, 1983AbstractA closed‐form expression for the in‐plane horizontal stiffness of a viscously damped, uniform, inclined cable in harmonic motion is presented. The cable is presumed to be deflected in a parabolic profile at its position of static equilibrium, and all dynamic displacements are assumed to be small.
A. S. Veletsos, G. R. Darbre
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