10.14489/TD.2014.02.PP.015-023

2014, 02 February

DOI: 10.14489/TD.2014.02.PP.015-023

Chuprin V.A.
OPTIMIZATION OF ULTRASONIC DEVICE PARAMETERS FOR MEASUREMENTS OF LUBRICANTS VISCOSITY FOR IN-LINE CONDITION DIAGNOSTICS OF MACHINE EQUIPMENT. PART 1
(pp. 15-23)

Abstract. Part 1. Check of suitability of rheological model
It is noted that actual viscosity of lubrication liquids is an important element of a complex of the information parameters regulated in ISO and reflecting a technical state of the diagnosed equipment. The reliability of the numerical values of shear viscosity found from ultrasonic measurements depends on a number of factors, most important of which are suitability of rheological model of the liquid on which the calculation of viscosity are based, compliance of the accepted in the analysis approximations influencing interaction of normal waves propagating in a waveguide immersed in a liquid to real measurement conditions, the integration possibility of ultrasonic waveguide impedance sensors in a design of the diagnosed equipment. The first of the listed factors is considered in the present article. Criteria of check of applicability of the Newtonian model of viscous liquids to real liquids are offered. Experimental researches are conducted on water solutions of glycerol with concentration of 0...100 % (viscosity of solutions changes from 0,01 to 10,00 Р) on three frequencies: 1,0; 1,7 and 2,5 MHz. It is established that in this frequency range the theory using Newton rheological model well describes the interaction of zero modes of normal waves with liquids till viscosity values up to 1 P. It is revealed that there are some frequency-independent distinctions between measured and tabular values of shear viscosity for very small viscous liquids. An explanation possibility of these distinctions is discussed by influence of roughnesses of a waveguide surface.

Keywords: diagnostics, ultrasonic measurements, horizontal-polarized normal plate wave, shear and kinematic viscosity, Newton rheological model, lubricant, water solutions of glycerol.

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Chuprin V.A
LLC «Scientific-Industrial Company «LUCH», Balashikha, Moscow region, Russia. E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

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