Results 211 to 220 of about 589,600 (262)
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Physical Review Letters, 1990
The extreme compressibility of a fluid near its liquid-vapor critical point significantly alters its dynamic response to temperature changes. Adiabatic processes allow a fluid of constant volume to thermalize in a matter of seconds, compared with the hours or days that thermal diffusion would require.
, Boukari +3 more
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The extreme compressibility of a fluid near its liquid-vapor critical point significantly alters its dynamic response to temperature changes. Adiabatic processes allow a fluid of constant volume to thermalize in a matter of seconds, compared with the hours or days that thermal diffusion would require.
, Boukari +3 more
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Critical Speed Control of a Solar Car
Optimization and Engineering, 2002The following optimal control problem is presented: The World Solar Challenge is a 3000 km race for solar powered cars across the Australian continent from Darwin to Adelaide. Each car is powered by a panel of photovoltaic cells which convert sunlight into electrical power.
Pudney, Peter, Howlett, Phil
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Critical speeding up in pure fluids
Physical Review A, 1990The extreme compressibility of a pure fluid near its critical point significantly affects its bulk dynamic response to temperature changes through adiabatic processes. Equations that describe the dynamics in the absence of gravity are developed, and the magnitude of the effect is illustrated with numerical solutions in one dimension.
, Boukari +3 more
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Journal of Applied Mechanics, 1963
It is shown that a damper applied to the spherical bearing at the ends of a rotating shaft to damp pitch and yaw motions of the journal bearing can markedly reduce the deflection caused by unbalance near critical speeds. Equations are given for optimizing the damping and for computing the damping moment which must be carried by the journal bearing.
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It is shown that a damper applied to the spherical bearing at the ends of a rotating shaft to damp pitch and yaw motions of the journal bearing can markedly reduce the deflection caused by unbalance near critical speeds. Equations are given for optimizing the damping and for computing the damping moment which must be carried by the journal bearing.
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The Journal of the Royal Aeronautical Society, 1937
The fact that attention must be given to stiffness as well as strength in aeroplane design is now generally recognised. The provision of adequate strength alone is not sufficient to ensure that an aeroplane is immune from such troubles as flutter, loss of lateral control due to twisting of the wing and wing divergence.
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The fact that attention must be given to stiffness as well as strength in aeroplane design is now generally recognised. The provision of adequate strength alone is not sufficient to ensure that an aeroplane is immune from such troubles as flutter, loss of lateral control due to twisting of the wing and wing divergence.
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VO2 Responses to Running Speeds Above Intermittent Critical Speed
International Journal of Sports Medicine, 2012The aim of this study was to examine whether intermittent critical speed (ICS) is the threshold velocity above which intermittent exercise leads to the attainment of VO(2max). After an incremental test, 7 active male subjects (49.7 ± 3.74 mL.min (- 1).kg (- 1)) performed 3 intermittent exercises until exhaustion at 100%, 110%, 120% of the velocity ...
R A, de Aguiar +3 more
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Aircraft Engineering and Aerospace Technology, 1943
THIS article is intended, firstly, as a means to a quick approximate determination of the critical reversal speed of a wing, and secondly to give a clearer insight of why approximations can be given for the general formula for determining K, when the aileron chord and wing chord are of linear taper at least over the aileron portion.
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THIS article is intended, firstly, as a means to a quick approximate determination of the critical reversal speed of a wing, and secondly to give a clearer insight of why approximations can be given for the general formula for determining K, when the aileron chord and wing chord are of linear taper at least over the aileron portion.
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The Critical Speed of Crankshafts
Aircraft Engineering and Aerospace Technology, 1936AN outstanding feature relevant to the consideration of shaft whip phenomena is that intermediate bearings cannot be depended upon to eliminate whip by reducing the free shaft length, for under these conditions the forces tending to produce whip are still present and are transmitted to the bearings in the form of shocks which are likely to coincide ...
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Evaluation of Critical Speeds in High Speed Aircraft Tires
SAE Technical Paper Series, 1989<div class="htmlview paragraph">By recasting the rolling tire system as a large deformation nonlinear eigenvalue problem, this paper develops a methodology capable of handling the critical speed/standing wave response. Based on a moderate/small deformation superposed on large finite element formulation, tangent properties are developed to enable ...
Joe Padovan +3 more
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Critical Speed in Centrifugal Pumps
Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; Process Industries; Technology Resources; General, 1982In high pressure centrifugal pumps the magnitude of the critical speed is strongly affected by the presence of liquid in the close clearance spaces of sealing rings and throttle bushings. The stiffening and damping effect resulting from the non-axisymmetric pressure drop across such gaps is often large compared with the elastic stiffness of the shaft ...
S. Gopalakrishnan, R. Fehlau, J. Lorett
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