Abstract
The excellent suspension stability of the high-viscosity linear polysiloxane magnetorheological fluid (HVLP MRF) makes it a great controlled medium for magnetorheological energy absorbers (MREAs). In our previous work, the Herschel–Bulkley flow model (HB model) was used to describe the shear-thinning rheological behavior and establish the dynamic model of an HVLP MRF-based MREA with radial flow mode. However, as the established model was implicit, the MREA response time increased and the buffer effect was degraded. To improve the time response characteristics, an explicit dynamic model based on the HB model incorporating minor losses (called the E-HBM model) is proposed in this study. The model parameters were identified based on the HBM model. To verify the E-HBM model, five evaluation parameters for the energy absorption performance of the MREA, that is, peak force, mean force, crush force efficiency, specific energy absorption, and stroke efficiency, were introduced to compare the theoretical results with the experimental results obtained using a high-speed drop tower facility with a mass of 600 kg. Then, the relative error of the crush force efficiency, specific energy absorption, and stroke efficiency was quantitatively and comprehensively analyzed considering the E-HBM model and experimental results. The results indicate that the proposed E-HBM model agrees with the impact behavior of the radial flow mode MREA.
Highlights
Magnetorheological fluids (MRFs) feature a reversible phase change between fluid and semi-solid states within milliseconds by controlling the applied external magnetic field [1]
In our prior work [29,30], we proposed a new Magnetorheological energy absorbers (MREAs) using the high-viscosity linear polysiloxane (HVLP) MRF as a controlled medium to achieve long-term stability
A crest appeared in the MREA force–displacement curve when the displacement was approximately 30 mm, which was a result of the fluid-solid interaction between the HVLP MRF and the corrugated tube
Summary
Magnetorheological fluids (MRFs) feature a reversible phase change between fluid and semi-solid states within milliseconds by controlling the applied external magnetic field [1]. Magnetorheological energy absorbers (MREAs), in which the MRF with controllable properties is used as a controlled medium, can adapt their load–stroke profile to varying impact conditions by adjusting the damping force [2,3] On this basis, MREAs have been extensively investigated for applications in vehicle suspensions [4,5,6], cable-stayed bridges [7,8,9], vibration isolators [10,11], engine mounts [12,13], and washing machines [14]. As HVLP MRF exhibits non-Newtonian fluid characteristics of shearing thinning behavior, the Herschel–Bulkley flow model (HB model) was used to accurately describe its rheological behavior for establishing the implicit dynamic model of an HVLP MRF-based MREA.
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