In-situ Capacitance Sensing for the Settlement of Magnetorheological Fluid: Simulation and Experiments

Abstract

In light of the insurmountable sedimentation of magnetorheological (MR) fluid, it is of great significance to ensure the performability of an MR damper by introducing a sensing method for MR fluid settling, and a key indicator to identify the health status of the MR damper is critical. However, the settling monitoring system for MR fluid can nowadays only function in a laboratory with transparent and non-magnetic tubes, which is not qualified for the in-situ sensing in a steel-made cylinder. Under the analysis of an open plate capacitor (OPC) configuration, the relationship between the concentration of magnetorheological fluid and the capacitance is investigated by simulation and experiments, and based on OPC, an in-situ sensing method for the settlement monitoring of magnetorheological fluid is designed. Long-time settling monitoring is carried out with home-made MR fluids, and the test results show that the sensing method can effectively reflect the status of settled MR fluids, and has the potential to be utilized in the identification of MR fluid compression points, which provides the strategic signal for the probable active or operational re-dispersing of MR fluid.

The research of a multi-stage roller type magnetorheological transmission device on temperature properties

“…Smart material is a new type of material developed to meet the needs of modern high-tech fields (Aboutalebi et al, 2021; Anupama et al, 2019; Aruna et al, 2021; Chen et al, 2020). Magnetorheological (MR) fluid is an essential branch of smart materials and consist mainly of soft magnetic particles, based carrier fluid and additives (Li et al, 2021a; Vadillo et al, 2021; Zhang et al, 2021). Under the applied magnetic field, the MR fluid is instantaneously transformed from a free-flowing Newtonian fluid to a semi-solid state as a Bingham fluid (Li et al, 2021b).…”

Magnetic field and microstructural effects on the electrical capacitance and resistance of a quadrupolar electrical capacitor based on cotton fabrics and carbonyl iron microparticles

“…The aggregation process induced by the magnetic field in the magnetizable phase influences the accumulation of electric charges, thus making MDF suitable for various types of EC-based sensors. A different type of EC with sensor function made in a vibration damper with MRS is reported in [11]. Here, the electrical capacitance of EC is sensitively dependent on the degree of sedimentation of carbonyl iron (CI) microparticles.…”