Prof. David Wagg Profile

Prof. David Wagg

at Univ of Sheffield

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Proceedings Article | 21 March 2019 Presentation + Paper

Magnetorheological bypass valve design for a semi-active inerter

Matthew Tipuric, David Wagg, Neil Sims

Proceedings Volume 10967, 109671L (2019) https://doi.org/10.1117/12.2514278

KEYWORDS: Control systems, Finite element methods

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Inerters are a class of vibration absorber which create a resistive force proportional to the relative acceleration across their two terminals. It has been previously shown that it is possible to create an inerter where the size of this force is variable, through use of a bypass channel controlled by a magnetorheological (MR) valve. However, the requirements and restrictions of such a device mean that existing design methodologies are insufficient. For example, as the pressure drop in the rest of the device is dependent on both the geometry of the device and the velocity of the fluid, it is important to design the valve with this in mind, in order to maximise the control range of the entire device, rather than just the valve itself. This work considers the effects of varying the dimensions of a valve and presents a performance metric to be used to allow comparison of different designs. The results are demonstrated as part of a model of a fluid inerter system.

Proceedings Article | 16 March 2018 Presentation + Paper

Semi-active inerters using magnetorheological fluid: a feasibility study

Matthew Tipuric, Predaricka Deastra, David Wagg, Neil Sims

Proceedings Volume 10595, 105951H (2018) https://doi.org/10.1117/12.2300749

KEYWORDS: Magnetism, Fluid dynamics, Vibration control, Earthquakes, Particles, Data modeling, Manufacturing, Scientific research, Smart materials, Smart structures

Read Abstract +

An inerter is a mechanical analogue to a capacitor, where the force across the device is proportional to relative, rather than absolute, acceleration. This concept can offer attractive performance in a wide variety of engineering vibration problems, because the engineer can tune the device without dramatically increasing the physical mass of the structure. Consequently, there have been many studies over the last two decades that have explored their application to bridge vibrations, seismic isolation of tall buildings, vehicle suspensions, and other engineering problems. Several configurations of inerter systems have been proposed, typically involving the inerter in a vibration absorber, or by using the inerter as part of an isolation system. However, to date there have been limited studies that have explored the combination of inerters with semi-active devices such as magnetorheological fluid dampers. Furthermore, because one manifestation of inerters involves the use of hydraulic fluid, it is possible for magnetorheological effects to be integrated into the inerter itself. The present study investigates the feasibility of this approach for practical scenarios. A quasi-static model is developed, combining an existing model of a fluid inerter with simplified models for magnetorheological fluids. The trade-off between damping performance and inerter performance is explored. The model is then used in a case study, where its potential use in a control strategy known as a parallel-layout inerter damper is investigated.

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