Abstract
Magnetorheological materials are a class of smart substances whose rheological properties can rapidly be varied by application of a magnetic field. The proposed damper consists of an electromagnet and a piston immersed in MR fluid. When current is applied to the electromagnet, the MR fluid solidifies as its yield stress varies in response to the applied magnetic field. Hence, the generation of a magnetic field is an important phenomenon in MR damper. In this research, the magnetic field generated in the damper was analyzed by applying finite element method using COMSOL Multiphysics and was validated using magnetic circuit theory. A quasi-static, 2D—Axisymmetric model was developed using parametric study by varying current from 0–3 A and the magnetic flux density change generated in the fluid flow gap of MR fluid due to external applied current was evaluated. According to the analytical calculations magnetic flux density generated at MR fluid gap was 0.64 Tesla and when calculated using FEA magnetic flux density generated was 0.61 Tesla for 1A current. There is a difference of 4.8% in the simulated results and analytically calculated results of automotive MR damper due to non linear BH curve consideration in Finite element analysis over linear consideration of BH relation in magnetic circuit theory.
Highlights
One of the most recent and promising technologies in vehicle damper design is implementing Magnetorheogical (MR) fluids
Magnetic circuit analysis was performed using Finite element method (FEM) and magnetic flux density, magnetic flux intensity and related yield stress was obtained at the fluid flow gap of MR damper
Whereas using magnetic circuit theory magnetic flux density of 0.64T was generated and using equation (16) yield stress was calculated as 34 kPa
Summary
One of the most recent and promising technologies in vehicle damper design is implementing Magnetorheogical (MR) fluids. These smart fluids have the capability to continuously and rapidly change their rheological behavior (viscosity) under applied magnetic field [1, 2]. Applying a magnetic field causes the microscopic particles suspended in the fluid to become uniformly oriented and form chains along the magnetic flux lines (figure 1(b)) [3]. This temporary internal structure changes the fluids rheological behavior [4]. When a magnetic field is applied to an MRF in a fluid gap which has flux lines due to electromagnetic circuit, the fluid behaves to a Bingham plastic [5]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
