Dynamic characteristics of a magnetorheological pin joint for civil structures

doi:10.1007/s11465-014-0283-0

Front. Mech. Eng.

2014, Vol. 9

Issue (1) : 15-33 https://doi.org/10.1007/s11465-014-0283-0

RESEARCH ARTICLE

Dynamic characteristics of a magnetorheological pin joint for civil structures

Yancheng LI(

),Jianchun LI

Centre for Built Infrastructure Research, Faculty of Engineering and Information Technology, University of Technology Sydney, NSW 2007, Australia

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Abstract

Magnetorheological (MR) pin joint is a novel device in which its joint moment resistance can be controlled in real-time by altering the applied magnetic field. The smart pin joint is intended to be used as a controllable connector between the columns and beams of a civil structure to instantaneously shift the structural natural frequencies in order to avoid resonance and therefore to reduce unwanted vibrations and hence prevent structural damage. As an intrinsically nonlinear device, modelling of this MR fluid based device is a challenging task and makes the design of a suitable control algorithm a cumbersome situation. Aimed at its application in civil structure, the main purpose of this paper is to test and characterise the hysteretic behaviour of MR pin joint. A test scheme is designed to obtain the dynamic performance of MR pin joint in the dominant earthquake frequency range. Some unique phenomena different from those of MR damper are observed through the experimental testing. A computationally-efficient model is proposed by introducing a hyperbolic element to accurately reproduce its dynamic behaviour and to further facilitate the design of a suitable control algorithm. Comprehensive investigations on the model accuracy and dependences of the proposed model on loading condition (frequency and amplitude) and input current level are reported in the last section of this paper.

Keywords Magnetorheological pin joint hyperbolic hysteresis model experimental testing frequency dependence

Corresponding Author(s): Yancheng LI

Issue Date: 16 May 2014

Cite this article:

Yancheng LI,Jianchun LI. Dynamic characteristics of a magnetorheological pin joint for civil structures[J]. Front. Mech. Eng., 2014, 9(1): 15-33.

URL:

https://academic.hep.com.cn/fme/EN/10.1007/s11465-014-0283-0
https://academic.hep.com.cn/fme/EN/Y2014/V9/I1/15

Fig.1 MR pin joint and its application to a civil structure

Fig.2 Working principle of MR pin joint in shear mode

Tab.1 Structural parameters of the MR pin joint

Fig.3 Magnetic flux line in the MR pin

Fig.4 Magnetic field density in MR pin joint (I=2.0 A)

Fig.5 Experimental setup for MR pin modeling test

Fig.6 Experimental data for 1.0 Hz excitation with an amplitude of 17.65 mm

Fig.7 Experimental data for 2.0 Hz excitation with amplitude of 7.06 mm

Fig.8 Experimental data for 2.0 Hz excitation with various amplitudes (I=2.0 A)

Fig.9 Experimental data for 2.0 Hz excitation with amplitude of 35.2 mm

Fig.10 Experimental data for 1.0 Hz excitation with amplitude of 17.6 mm

Fig.11 Experimental data for 28.2 mm excitations with various loading frequencies (I=0 A)

Fig.12 Rotational hyperbolic hysteresis model

Fig.13 Hyperbolic tangent function

Fig.14 Relationship between main parameters and hysteresis loop

Fig.15 Comparison between the experimental data and the results from the analytical model under different loading conditions (f=3.0 Hz)

Fig.16 Comparison between test data and the proposed hyperbolic hysteresis model (Amplitude=28.2 mm)

Fig.17 Comparison between test data and proposed hyperbolic hysteresis model (Amplitude=7.06 mm)

Fig.18 Comparison between test data and proposed hyperbolic hysteresis model (Amplitude=28.20 mm)

Tab.2 Errors for the proposed model (f=0.1Hz)

Tab.3 Errors for the proposed model (f=0.5Hz)

Tab.4 Errors for the proposed model (f=1.0Hz)

Tab.5 Errors for the proposed model (f=2.0Hz)

Fig.19 Variations of 6 model parameters with coil current for 17.65mm loading excitations at various frequencies (0.1, 0.5, 1.0, 2.0 and 3.0 Hz)

Fig.20 Variations of 6 model parameters with loading frequency for 17.65mm loading excitations at current levels (0, 0.5, 1.0,1.5 and 2.0 A)

Fig.21 Variations of 6 model parameters with coil current for 1.0Hz loading excitations at various amplitude (7.06, 17.65, 28.2 and 35.2 mm)

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