Principle, design and modeling of an integrated relative displacement self-sensing magnetorheological damper based on electromagnetic induction

Abstract

In order to make full use of the controllable damping characteristics of magnetorheological (MR) dampers, feedback control of the damping forces for MR dampers is necessary, which needs extra dynamic response sensors and control systems as active control systems do. The extra dynamic response sensors for semi-active control of the MR dampers will increase the application cost of MR dampers, occupy the installation space, complicate the system, and decrease the reliability. In this paper, an integrated relative displacement sensor (IRDS) technology to make MR dampers self-sensing based on electromagnetic induction, and the principle of an integrated relative displacement self-sensing MR damper (IRDSMRD) based on the IRDS technology, are introduced. The IRDSMRD mainly comprises an exciting coil wound on the piston and an induction coil wound on the nonmagnetic cylinder. In the IRDSMRD, the coil wound on the piston simultaneously acts as the exciting coils of the MR fluid and the IRDS while the coil wound on the cylinder acts as the induction coil of the IRDS. The MR fluid in the annular fluid channel and the IRDS are simultaneously energized by the exciting coil through letting the carrier of the IRDS (AC) possess different frequency from the current for the MR fluid (DC), which realizes the frequency division multiplexing of the exciting coil. Based on the proposed principle for the IRDS and IRDSMRD, an IRDSMRD is designed and modeled and the damping and sensing performances of the designed and developed IRDSMRD are also modeled and analyzed using the finite element method (FEM) with the software package Maxwell 2D. The research results indicate that the function of the relative displacement sensing property can be integrated into MR dampers, and the designed IRDSMRD possesses large controllable damping ratio and good relative displacement sensing performance utilizing the IRDS technology proposed in this paper.

Magnetorheological Self-Powered Vibration Reduction System with Current Cut-Off: Experimental Investigation

“…The studies: Sapiński, (2008) and Sapiński (2010) concern design considerations, calculations of magnetic field and experimental tests of the electromagnetic induction devices, that could be integrated with an MR damper. The reports (Wang et al, 2009) and (Wang and Bai, 2013) demonstrate the idea of an integrated relative displacement self-sensing MR damper and also designing, fabrication and experimental testing of its prototype. The study (Xinchun et al, 2015) presents a novel self-powered MR damper focusing on its theoretical and experimental analysis.…”

Design and analysis of a self-powered, self-sensing magnetorheological damper

“…However, complex structure, strict manufacturing processes and expensive magnetostrictive materials make their commercialization difficult. Wang and his associates [11,12] proposed an MR damper integrated with a relative displacement sensor based on electromagnetic induction. This displacement sensing method could measure the displacement accurately but requires complex electrical circuits for signal processing.…”

Electrical Interface for a Self-Powered MR Damper-Based Vibration Reduction System

“…Those systems make use of the electromagnetic method of energy conversion based on the Faraday's law. These issues are addressed in more detail in the works of Cho et al 2005Cho et al , 2007aCho et al , 2007b, Choi and Werely (2009), Wang et al (2009), Sapiński (2008Sapiński ( , 2011, Snamina and Sapiński (2011). Results reported in those papers indicate that energy recovered from vibration is sufficient to power MR dampers and ensure vibration reduction in the neighbourhood of the resonance frequency.…”