Influence of Working Fluid in the Throttle Channels of Hydraulic Mounts on the Damping Properties

Russian Engineering Research - The influence of the reduced mass of the working fluid in the throttle channels of a hydraulic mount on its motion and damping is considered. The acceleration and...     

Experimental investigations of the laws of energy dissipation during dynamic deformation of nanocrystalline titanium

The mechanical and thermodynamic characteristics of nanocrystalline (NC) titanium have been experimentally studied under the conditions of dynamic compression at a strain rate of (2–5) × 10³ s⁻¹. The samples of NC titanium were cut from a rod processed by equal-channel angular pressing and had a characteristic grain size of 300 nm. It is established that a 25% increase in the dynamic limit of elasticity in the NC titanium (compared to an initial coarse-grained sample) is accompanied by qualitative changes in the process of energy absorption and dissipation in the material. The amount of dissipated energy remains approximately constant and independent of the rate and amplitude of loading in the entire range of strain rates studied.     

Gas-film filtration of fine-disperse suspensions

Film filtration of fine-disperse suspensions occurring on permeable cylindrical surfaces exposed to a gas flow is studied. The processes without formation of a sediment and those involving its accumulation are considered.S. M. Kirov Belorussian Technological Institute, Minsk. Translated from Inzhenerno-fizicheskii Zhurnal, Vol. 63, No. 6, pp. 702–707, December, 1992.     

Interrelation between the Kinetic Indices of the Process of Rectification and Moving Forces

The authors obtained generalized dependences for the heights of transfer units of ideal and actual steps that are expressed by the parameters of an actual tray in the vapor and liquid phases. The particular dependences of the heights of the transfer units equivalent to a theoretical tray that are expressed by the parameters of an actual tray in the vapor phase are presented for four variants of interrelation between the ideal and actual trays, two of which are characteristic of the Murphree model in analyzing the efficiency in the vapor and liquid phases and one of which is characteristic of the Hausen model. The ratio of the heights of the ideal and actual trays in all the variants is equal to the efficiency. It is noted that the expressions of the average moving forces, the mass-transfer coefficients, and the numbers of transfer units are individual for each variant and form of organization of phase motion, but in generalized form they are given by the existing dependences.     

Deformation behavior of submicrocrystalline aluminum alloys during dynamic loading

The structure and the mechanical properties of aluminum V95 and AMts alloys with various grain sizes (from micron to submicron) are studied in a wide range of strain rates (from 10^–3 to 10⁵ s^–1). Submicrocrystalline (200–600 nm) materials are formed by dynamic channel-angular pressing at a strain rate of 10⁵ s^–1 using a pulsed power source.     

Measuring the torque of rotating shafts

Measurement of the torque of elastic beams on the basis of the beat frequency is considered. The beat frequency is determined by means of broad-band frequency modulation of high-frequency sweep generators.     

Impact-load damping by integral hydraulic bearings

To reduce vibration and impact loads, a gas–hydraulic damper is proposed. Its working element is a magnetic rheological liquid.