Finite Element Magnetic Method for Magnetorheological Based Actuators

Abstract

Magnetorheological materials based actuators have been currently exciting research topic for more than half-decades. Some actuators have been developed based on magnetorheological fluids and elastomers such as dampers, brakes, haptic devices, clutches, mountings, etc. These devices have their exciting properties which are capable of changing characteristic based on the amount of magnetic flux applied to them. Due to this capability, they are usually called semi-active devices. These devices employ an electromagnetic coil for magnetic flux production. Therefore, during the design process, magnetostatic simulation using the finite element method magnetic is carried out to make a better magnetic circuit. This chapter will consider several discussions such as necessary magnetostatic using free software finite element method magnetic (FEMM); design consideration for the magnetic circuit of the device and case studies of several type simulation in magnetorheological materials based devices.

Magnetically-Induced Pressure Generation in Magnetorheological Fluids under the Influence of Magnetic Fields

“…In order to quantify the observation, the magnetic field need to be estimated because it is not possible to insert the Gaussmeter probe in the U-shaped tube arrangement. The magnetic field estimation is conducted using FEMM an open-source software, 2-D finite element software widely used in magnetic analysis and simulations [11,[30][31][32][33]. The FEMM simulation was carried out to simulate the magnetic circuits that exist in the theoretical model of the U-shaped tube apparatus.…”

“…Based on the data obtained, that the simulation results are close to the measurement results, with an average error of 3%. Similar methods have been used in previous studies, such as in [11,30,33]. An experiment was then conducted with the research apparatus; a U-shaped tube was designed and made out of glass (Figures 4 and 5).…”

Effect of Time and Frequency of Magnetic Field Application on MRF Pressure Performance

“…Due to the fact that it is not easy to measure magnetic field strength in the research configuration, in this case, the magnetic field strength is represented in the form of an electric current. As has been mentioned in several articles [7,16,37,38], the magnitude of magnetic field strength in a magnetic coil can be predicted using FEMM software. Therefore, in this case, the strength of the magnetic field was directly proportional to the electric current flowing in the magnetic coil.…”

“…Magnetorheologicalmaterial-based actuators have been an interesting research topic for more than half a decade. Many actuators have been developed based on magnetorheological fluids and magnetorheological elastomers such as dampers, brakes, haptic devices, couplings, and mounts [7]. Since Rabinow published the discovery of MRF in 1948 at the US National Bureau of Standards [8], various patents have been registered, and various research articles related to MRFs have continued to be published [9].…”

“…Various research articles and studies that take advantage of the potential of MRF continue to be carried out, for example, with regard to shock absorbers [7,[10][11][12][13], brakes [14][15][16], valves [12,[17][18][19], polishing [20][21][22], haptic devices [23][24][25], mounts [26][27][28], and sound propagation [29,30].…”