Experimental validation of a novel magnetorheological damper with an internal pressure control

Abstract

In the present paper we investigated the behaviour of magnetorheological fluids (MRFs) under a hydrostatic pressure up to 40 bar. We designed, manufactured and tested a magnetorheological damper (MRD) with a novel architecture which provides the control of the internal pressure. The pressure was regulated by means of an additional apparatus connected to the damper that acts on the fluid volume. The MRD was tested under sinusoidal inputs and with several values of magnetic field and internal pressure. The results show that the new architecture is able to work without a volume compensator and bear high pressures. On the one hand, the influence of hydrostatic pressure on the yield stress of MRFs is not strong probably because the ferromagnetic particles cannot arrange themselves into thicker columns. On the other hand, the benefits of the pressure on the behaviour of the MRD are useful in terms of preventing cavitation. Note: The following files were submitted by the author for peer review, but cannot be converted to PDF. You must view these files (e.g. movies) online. reviewed_JIMSS_SMASIS2015.tex harvard.bst graphs.rar imm.rar http://mc.manuscriptcentral.com/jimss

A General Modeling Approach for Shock Absorbers: 2 DoF MR Damper Case Study

“…This device shows cavitation phenomena when no pressure is applied. On the other hand, when pressure is applied, it shows a similar behavior expected from a MR damper, no matter the applied level of electric current, Golinelli and Spaggiari (2017). The inclusion of cavitation in mathematical models of (p or SA) shock absorbers it is not a trivial task.…”

“…The architecture includes no protruding elements, a thermal compensation system, and cavitation prevention. For full details on the design and explanation of the functioning of this specimen, see Golinelli and Spaggiari (2017). The MR damper assembly uses commercial components: a hydraulic cylinder, its cylinder head, and two ball joint ends.…”

“…This paper deals particularly with the suitability of this method to understand and model a damper using its characteristic diagrams when it has one damping control input. The specimen to be used in this work has two control inputs, Golinelli and Spaggiari (2017): electric current and the pressure in the accumulator. In this context, the work focuses on the application of the method to analyze the effect of more than one control input on the damping force and in the characteristic diagrams, and a further method extension to include such effects.…”

Design and modeling of an innovative magnetorheological fluid-elastomeric damper with compact structure

“…Regardless of the universal joints for installation, the MRFE damper has an overall length of 230 mm with the total volume and total mass of 827 cm 3 and 2.7 kg. The maximum stroke of the damper is 5 mm and other main dimensional parameters given in Figure 3 are determined by the optimal design of the magnetic circuit, which is a method widely adopted in the design process of the MR damper (Golinelli and Spaggiari, 2017; Yoo and Wereley, 2002). Based on the proposed structure, a finite element model shown in Figure 4 was established to optimize the magnetic circuit structure of the MRFE damper.…”

Design and development of a wedge shaped magnetorheological clutch

“…Quality of semi-active controls are significantly decided by the dynamic range. MR valve presented by Kub ık et al 26 has a very high dynamic range of eight at a velocity of 0.065 m/s and has an average response time 4.1 ms. Golinelli and Spaggiari 27 have proposed a new MRD to examine the influence of hydrostatic pressure on MRF behaviour. The MRD, having a maximum dynamic range of 5.64, incorporates an internal counter rod placed at the bottom of the damper to control the pressure.…”