The effect of external electromagnetic fields on the shear rate gradient of magnetorheological working medium layers
Keywords:
magnetorheological control devices, viscoplastic media, pseudoplastic media, dilatant media, rheological propertiesAbstract
The importance of improving machine drives requires constant development of alternative drive technologies which include magnetorheological, magnetodynamic and magneto-liquid technologies. In the recent years, magnetorheological, magnetodynamic, and magneto-liquid devices have proved to be effective; therefore their further development is considered relevant. Combined magnetorheological drives are promising innovation in drive systems. Such drive systems control the flow of magnetorheological working medium by changing its viscosity and generating rheological effects. It is obvious that in combined magnetorheological systems there is additional external shear force in working fluids. This requires revision of the main theoretical approaches to estimating the viscosity of the working medium in combined magnetorheological systems. When calculating and modeling combined or regular magnetorheological systems,
it is important to estimate the viscosity characteristics of the working medium and forecast its possible rheological anomalies. The article describes a method for modeling the viscosity properties of magnetorheological working medium. A distinctive feature of the proposed method is that it allows us to take into account the effect of external electromagnetic fields on the shear rate gradient of magnetorheological liquid layers. The paper presents the results of numerical modeling obtained with the Matlab application package. The results of the computer experiment show that the proposed method can assess the effect of external electromagnetic fields on the shear rate gradient of layers under shear stresses and the electromagnetic component. This makes it possible to determine the probability of development of viscoplastic, pseudoplastic, and dilatant properties in the magnetorheological working medium and of appearance of rheological effects which are characteristic of magnetorheological working media.
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