The technologies of the management of flow characteristics by modifying the rheological properties of the working environment

The paper analyzes the disadvantages of inherent to the classic hydraulic throttling devices which is used in various high-precision systems. The authors examine the existing methods of fluid flow control by changing the flow resistance of hydraulic fluid. It describes the physical basis of the implementation for management of hydrodynamic resistance by magnetorheological and electrorheological environments. It is analyzed the benefits of using these systems in comparison with conventional hydraulic throttling equipment. It is estimated the advantages of using the magnetorheological control devices compared to the electrorheological control devices. In the example of magnetorheological systems it is provided the method for calculating the static characteristics of throttling devices which are operated by changing the flow resistance of the working fluid in the hydraulic system. It presents the investigations of important physical and chemical properties of the magnetic particles. These properties are required in determining the essential parameters for the calculation of the control signal. The results are obtained by carrying out of scanning electron microscopy of magnetic particles and spectroscopy of magnetic particles. The authors describe the combined methods of management of flow characteristics by modifying the rheological properties of the working environments. It is provided the practical importance of the investigations of non-Newtonian properties of the working fluids. The authors cite the example of the required simulation of non-Newtonian properties of the magnetorheological fluid. It gets possible due to use a dilatant fluid as carrier liquid. It is indicated the advantages achieved by the using such combined control methods of flow characteristics by modifying the rheological properties of the working media and described easy way to implement of these methods. It is proposed the more efficient combined method of management of the flow characteristics by the rotating control field and the substantiation of the physical effects arising.