Results 241 to 250 of about 3,531,996 (294)

Natural Frequencies of Mindlin Circular Plates

Journal of Applied Mechanics, 1980
The natural frequencies of vibration based upon the Mindlin plate theory are tabulated for uniform circular plates with free, simply supported, and clamped edges for the first several tens modes.
Irie, T., Yamada, G., Aomura, S.
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Computation of Natural Frequencies

2015
The frequencies at which a PKM tends to vibrate when hit, struck or somehow disturbed are known as the natural frequencies. The determination of the natural frequencies of PKM is needed for both design and control purposes. In this chapter, we present the computation of natural frequencies of parallel robots.
Sébastien Briot, Wisama Khalil
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Natural Frequencies of Uniform Grillages

Journal of Applied Mechanics, 1963
The natural frequencies for the transverse vibration of grillages with various types of boundary conditions are studied, taking into account the distributed mass of the beams. Finite-difference calculus is used for deriving the frequency equations.
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Natural Frequency of Gears

Journal of Fluids Engineering, 1930
Abstract The natural frequency of machine parts as related to the noise problem in machine operation is discussed in a general manner. Vibration phenomena in disks and rings are described in detail, following which the author discusses the manner in which a gear vibrates at its natural frequency.
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Natural hybridization: Frequency

1997
Abstract As discussed in Chapter ], numerous investigators have used natural hybridiza tion as a tool for studying phenomena that may cause population divergence and speciation (i.e., the formation of ban-iers to reproduction; Barton and Charlesworth, 1984; Coyne and Barton, 1988; Hewitt, 1988; Barton and Hewitt, 1989).
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Frequency of Natural Events

Journal of the Hydraulics Division, 1961
In order to explain magnetic frequency relationships, development of cumulative frequency curve and its statistical interpretation are discussed; from frequency curve, relation between magnitude and design period in years is derived; applicability of procedure is shown by sampling from 1023-yr period of tree-ring indexes.
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Natural Frequencies of a Railroad Track

Journal of Applied Mechanics, 1987
The natural frequency of an infinite railroad track was first determined by Timoshenko as ωR = √k/m, where k is the constant for the massless Winkler foundation and m is the mass per unit length of the rail. The natural frequencies of the track are determined here by modeling the track as a beam resting on a 3-D inertial elastic layer. It is shown that
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Natural (low frequency) emissions

1993
Such emissions can be of distinct origin; they may be triggered by external events, e.g. lightning discharges, produced by plasma instabilities or by internal geophysical processes, e.g. invasion of corpuscles. They originate preferentially in the magnetosphere.
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Frequency-Dependent Choice, Minority Advantages, and Frequency-Dependent Natural Selection

Evolution, 1977
Frequency-dependent natural selection is potentially important both as a mode by which gene frequencies of populations change and also as a possible explanation of the genetic load paradox. If most alleles are maintained at equilibrium under a frequency-dependent mode such that they are selectively equivalent at equilibrium, then no load is felt by ...
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Natural Frequencies, an Approximation

2004
Generally, when calculating the natural frequencies of complex dynamic linear systems the finite element analysis method is applied. However, it is good practice to first apply a method to approximately calculate the natural frequency of that system to get a feel for the value of the natural frequency.
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