Abstract
Inerters are a two-terminal mass element, and the forces applied at their two terminals are proportional to the relative acceleration between the two terminals. The volume and weight of inerters are much smaller than those of any conventional mass element providing a same generated force, which is beneficial to engineering applications. The inerter in mechanical system is completely corresponding to the capacitor in electrical system, which makes it more convenient to do related investigations based on mechanical-electrical analogies. A semi-active inerter (SAI) featuring magnetorheological (MR) effect with tunable inertance is proposed, designed and investigated to enhance the performance of the passive inerters. The proposed SAI consists of a flywheel, a flywheel housing, a ball screw, a connection sleeve, bearings, upper and lower covers, excitation coils and MR fluid. MR fluid fulfilled in the flywheel housing of the SAI is energized by the excitation coils with applied current, and correspondingly the mechanical characteristics of the SAI is tunable via the applied current. The mathematical model and the mechanical performance of the SAI is established and tested, respectively. The nonlinearity of the experimental results is analyzed and the nonlinear model of the SAI is further established. The preliminary principle verification of the continuous adjustment of the equivalent inertance of the SAI is conducted using the nonlinear model. Moreover, a compensator is proposed to address the problem of the phase difference between the controllable force and the real output force of the SAI, and continuous inertance adjustment of the SAI with a compensator is realized and analyzed.
Highlights
In Smith (2002) introduced the concept of the inerter based on the mechanical-electrical analogy
Where η is the viscosity of the MR fluid in field-off state; τ y is the shear yield stress of the MR fluid; R1 is the outer radius of the flywheel; R2 is the inner radius of the flywheel housing; nd is the rotational speed of the flywheel; sd is the width of the annular gap; Ld is the axial length of the flywheel; δ is the correction coefficient with consideration of the influence of the magnetic leakage and ξ is the coefficient of the effective area (Bai et al, 2018)
In order to enhance the performance of the conventional passive inerter, the structural principle of an semi-active inerter (SAI) was proposed and studied in this paper
Summary
Inerters are two-terminal mass elements in which the forces applied at the terminals are proportional to relative acceleration between the nodes. A semi-active inerter (SAI) featuring a magnetorheological (MR) effect with tunable inertance is proposed, designed, and investigated to enhance the performance of the passive inerters. MR fluid fulfilled in the flywheel housing of the SAI is energized by the excitation coils with applied current, and correspondingly the mechanical characteristics of the SAI are tunable via the applied current. The nonlinearity of the experimental results is analyzed and the non-linear model of the SAI is further established. The preliminary principle verification of the continuous adjustment of the equivalent inertance of the SAI is conducted using the non-linear model.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
