Model identification methodology for fluid-based inerters

Xiaofu Liu, Jason Zheng Jiang*, Branislav Titurus, Andrew Harrison

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

31 Citations (Scopus)
468 Downloads (Pure)

Abstract

Inerter is the mechanical dual of the capacitor via the force-current analogy. It has the property that the force across the terminals is proportional to their relative acceleration. Compared with flywheel-based inerters, fluid-based forms have advantages of improved durability, inherent damping and simplicity of design. In order to improve the understanding of the physical behaviour of this fluid-based device, especially caused by the hydraulic resistance and inertial effects in the external tube, this work proposes a comprehensive model identification methodology. Firstly, a modelling procedure is established, which allows the topological arrangement of the mechanical networks to be obtained by mapping the damping, inertance and stiffness effects directly to their respective hydraulic counterparts. Secondly, an experimental sequence is followed, which separates the identification of friction, stiffness and various damping effects. Furthermore, an experimental set-up is introduced, where two pressure gauges are used to accurately measure the pressure drop across the external tube. The theoretical models with improved confidence are obtained using the proposed methodology for a helical-tube fluid inerter prototype. The sources of remaining discrepancies are further analysed.

Original languageEnglish
Pages (from-to)479-494
Number of pages16
JournalMechanical Systems and Signal Processing
Volume106
Early online date29 Jan 2018
DOIs
Publication statusPublished - 1 Jun 2018

Keywords

  • Analogy
  • Damping
  • Fluid
  • Helical-tube
  • Hydraulic network
  • Identification
  • Inerter
  • Modelling

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