Abstract
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.
Highlights
Using inerter-based vibration absorber for passive vibration control of mechanical systems has been a popular research topic since inerter’s first introduction in 2002 [1]
The promising benefits of incorporating inerter into passive suspension system have been verified in various applications, which spread over a wide range of areas, including automotive engineering [2,3,4], civil engineering [5,6,7], railway engineering [8,9,10,11], and aerospace engineering [12]
This paper focuses on the study of a helical-tube fluid inerter design
Summary
Using inerter-based vibration absorber for passive vibration control of mechanical systems has been a popular research topic since inerter’s first introduction in 2002 [1]. A lumped parameter hydraulic model, and an equivalent mechanical model have been established By using these two models, the damping, inertance and stiffness effects in the mechanical network can be linked directly with the resistances, inertances and compliances in the hydraulic system. This analogy will help to understand the properties of fluid-based inerters better and facilitates future design of hydraulic vibration absorption systems. A system identification procedure for fluid-based inerter devices is followed This procedure, by separating the identification of friction, stiffness and various damping effects, enables more accurate estimation of each parameter.
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