Abstract
The purpose of this paper is to compare two different methods for describing the sedimentation in different MRFs. It was decided to obtain electric resistivity of the MR fluid under magnetic field and to measure inductance of the solenoid, which is around the MR fluid, for diagnostic of the sedimentation. The electrical resistivity of the MR fluids and inductivity of the solenoid was measured daily for 11 days for 5 different MR fluids: (Lord MRF-140CG, Lord MRF-122EG, Liquids Research Company MRHCCS4-A and Liquids Research Company MRHCCS4-B and MUDZH-3 made in A. V. Luykov Heat and Mass Transfer Institute, Minsk, BY). These two methods and according procedures are described below.
Highlights
A magneto-rheological fluid (MR fluid or MRF) is a type of smart fluid where micro sized particles are in a carrier fluid, usually a type of oil
Resistivity changes while magnetic field is applied were described in a literature [6, 7], but they do not describe how the sedimentation influences the electrical resistivity of MR fluid
Fluids, which is made by Liquids research company, MRHCCS4-A and MRHCCS4-B, have higher electrical resistivity compared to other MR fluids
Summary
A magneto-rheological fluid (MR fluid or MRF) is a type of smart fluid where micro sized particles are in a carrier fluid, usually a type of oil. [1, 2] When sedimentation of particles occurs in MR fluid, working of the device can cause some errors or can be not stable. To determine sedimentation level in the MR fluid ultrasonic sensors can be used [4]. Velocity of the ultrasonic sensors differs under magnetic field and when sedimentation occurs. Another method to identify the sedimentation level in MR fluid is to measure a temperature change in two sensors. Resistivity changes while magnetic field is applied were described in a literature [6, 7], but they do not describe how the sedimentation influences the electrical resistivity of MR fluid
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