Results 221 to 230 of about 589,600 (262)

Distance Capacity Above the Critical Speed and Speed Reserves: are they Related?

International Journal of Sports Medicine
AbstractThe aim of this study was to correlate the anaerobic speed reserve and the maximal speed reserve with the distance capacity above the critical speed (D′), derived from four different mathematical models, in a group of endurance runners.
Lucas Vecchia Lanzarini, Fernando Klitzke Borszcz, Isadora Dalla Lana, Tiago Turnes, Thiago Pereira Ventura, Kerry McGawley, Ricardo Dantas de Lucas   +6 more
openaire   +2 more sources

On the Critical Speeds of a Continuous Rotor

Journal of Engineering for Industry, 1969
An analytical investigation was made on the effect of axial torque on the critical speeds of a continuous rotor whose motion was described by a set of partial differential equations including the effects of transverse shear, rotatory inertia, and gyroscopic moments.
R. L. Eshleman, R. A. Eubanks
openaire   +1 more source

Vibrations and Critical Speeds

1969
Suppose a mass m to be carried on an elastic support, such as a spring, which has a stiffness k (force per unit extension). Then, if the mass is given a displacement x from its equilibrium position, the support will exert a restoring force equal to kx.
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Critical Speed of Centrifugal Pumps

The Shock and Vibration Digest, 1984
Until recently, critical speed calculations of centrifugal pumps were made without considering the rotor dynamic effects of close clearance running fits. Publications in the last few years have made it clear that these effects must be considered in order to make the computations relevant to pump operation.
S. Gopalakrishnan, Y. Usui
openaire   +1 more source

Critical Speed for Floppy Disks

Journal of Applied Mechanics, 1998
This paper uses Lyapunov’s method to determine the critical speed of a flexible spinning disk enclosed in a housing that hydrodynamically couples the transverse motion of the disk to the motion of the thin films of air surrounding the disk. Depending on the clamping ratio, this critical speed is three to ten times higher than the critical speed in the ...
openaire   +1 more source

Critical speeds in powder rolling

Soviet Powder Metallurgy and Metal Ceramics, 1978
1. It is confirmed that the “fluidization” phenomenon should be taken into account in calculations of the upper critical and maximum rolling speeds of powders. 2. Calculations of the upper critical rolling speeds of powders should be made with allowance for the fact that during rolling air expulsion from the region of deformation in the ...
openaire   +1 more source

THE CRITICAL SPEEDS OF TORSIONAL VIBRATION

SAE Technical Paper Series, 1920
<div class="htmlview paragraph">Vibrations of several kinds can occur in crankshafts, but the principal ones are transverse and torsional; the paper deals entirely with the latter. A simple case of torsional vibration is considered first and the principles are applied to the torsional vibration of a shaft, the argument being carried forward at ...
openaire   +1 more source

Improvement of the critical speed in high-speed ballasted railway tracks with stone columns: A numerical study on critical length

Transportation Geotechnics, 2021
Jorge Castro, Marina Miranda, Jesus Fernández Ruiz   +2 more
exaly  

Analysis of Critical Speed for High-Speed Railway Pantograph-Catenary System

IEEE Transactions on Vehicular Technology, 2022
Zhendong Liu, Yang Song, Fuchuan Duan
exaly  

Analysis of conceptual similarities and differences of wave speed and critical speed in the overhead catenary system

Measurement: Journal of the International Measurement Confederation, 2021
Habibollah Molatefi, Mohammad Ali Rezvani, Farzad Vesali   +2 more
exaly