Thermal generation of elastic vibrations taking account of the finite heat-propagation velocity

By analyzing the solution of a problem of coupled dynamic thermoelasticity with the finite heat-propagation velocity taken into account, the possibility of its experimental determination by using acoustic methods is shown.     

Complex investigation of the fluctuating thermohydrodynamic characteristics of a marine medium

Methods of measuring the fluctuating characteristics of seawater are described. Certain results obtained by using these methods are presented.Research performed jointly with the Far East Scientific-Research Hydrometeorological Institute as part of a complex investigation of the pulsating characteristics of a marine medium by using acoustic, optical, and thermocontact methods developed in the A. V. Lykov Institute of Heat and Mass Transfer of the Belorussian Academy of Sciences.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 37, No. 4, pp. 692–698, October, 1979.     

Methods of researching thermophysical parameters and phenomena by means of nonstationary-frequency measurements. Part 2. Step and instantaneous heating methods

Various types of instantaneous and stepped heat source are considered, which act in unbounded bodies. A method has been devised for using the solutions to define the thermophysical parameters by means of nonstationary-frequency measurement methods.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 55, No. 2, pp. 243–250, August, 1988.     

Frequency shift of received waves

Phenomena are examined which cause the frequency of a wave process to change from source to receiver. Analytical expressions are derived for the magnitude of the frequency shift and special cases are considered.Notation c velocity of wave propagation through the medium - f frequency - X a space coordinate - time - phase - u₁ and u₂ velocity of the source and of the receiver, respectively - v velocity of the medium - ₃ wave travel time from source to receiver Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 41, No. 3, pp. 507–513, September, 1981.     

On modulation of sound by sound

Frequency shifts of continuous acoustic waves propagating in a medium which arise due to the effect of external acoustic disturbances arbitrarily propagating in the same medium are analyzed. An analytical dependence of the magnitude of the acoustic shift on the angle between the wave vectors of the probing and external waves is obtained. A corresponding directivity pattern is calculated. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 70, No. 2, pp. 230–235, March–April, 1997.     

Temperature dependence of the velocity of ultrasound and electrical conductivity of an epoxy composite with a carbon filler

Experimental data are given on the behavior of the velocity of ultrasound and electrical conductivity as a function of the temperature in an epoxy composite material filled with carbon fiber.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 43, No. 3, pp. 413–417, September, 1982.     

Measurement of the fluid flow velocity by an acoustic frequency—phase method

New frequency-phase acoustic methods are described as well as the principles for apparatus realization of the recording the flow parameters of a fluid (sea) medium possessing elevated sensitivity and low inertia.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 49, No. 2, pp. 242–252, August, 1985.     

Nonstationary doppler effect for waves propagating in nonhomogeneous media

The theory of the frequency shift of continuous waves propagating in a medium whose properties depend on the coordinates and time is presented.Translated from Inzhenerno-Fizicheskii Zhurnal. Vol., 43, No, 4, pp. 609–615, October, 1982.     

Superposition principle in acoustics

Using the effect of the nonstationary frequency shift of acoustic waves in a medium with spatially and temporally varying properties, a theoretical estimate is made of the deviation from the superposition principle for an acoustic wave propagating in the field of another continuous plane wave.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 43, No. 5, pp. 826–833, November, 1982.