Design and modelling of a fluid inerter

Swift, Stuart; Smith, Malcolm; Glover, Andrew; Papageorgiou, Christos; Gartner, B.; Houghton, N

doi:10.1080/00207179.2013.842263

Cited by 209 publications

(130 citation statements)

References 7 publications

Supporting

Mentioning

128

Contrasting

Order By: Relevance

“…The constant of proportionality is termed “inertance” and is measured in mass units (kg). Notably, several different inerter prototypes were devised and experimentally tested over the past decade achieving inertance values orders of magnitude larger than the devices' physical mass, while observing a linear behavior within relatively wide frequency bands of practical interest . These devices are relatively small‐scale tailored for and used in vehicle suspension systems.…”

Section: Introductionmentioning

confidence: 99%

Optimal tuned mass-damper-inerter (TMDI) design for seismically excited MDOF structures with model uncertainties based on reliability criteria

Giaralis

Taflanidis

2017

Struct Control Health Monit

235

133

View full text Add to dashboard Cite

Summary The tuned mass‐damper‐inerter (TMDI) is a recently proposed linear passive dynamic vibration absorber for the seismic protection of buildings. It couples the classical tuned mass damper (TMD) with an inerter, a two‐terminal device resisting the relative acceleration of its terminals, in judicial topologies, achieving mass‐amplification and higher‐modes‐damping effects compared to the TMD. This paper considers an optimum TMDI design framework accommodating the above effects while accounting for parametric uncertainty to the host structure properties, modeled as a linear multi degree of freedom system, and to the seismic excitation, modeled as stationary colored noise. The inerter device constant, acting as a TMD mass amplifier, is treated as a design variable, whereas performance variables sensitive to high‐frequency structural response dynamics are used to account for the TMDI influence to the higher structural modes. Reliability criteria are adopted for quantifying the structural performance, expressed through the probability of occurrence of different failure modes related to the trespassing of acceptable thresholds for the adopted performance variables: floor accelerations, interstory drifts, and attached mass displacement. The design objective function is taken as a linear combination of these probabilities following current performance‐based seismic design trends. Analytical and simulation‐based tools are adopted for the efficient estimation of the underlying stochastic integral defining the structural performance under uncertainty. A 10‐story building under stationary Kanai‐Tajimi stochastic excitation is considered to illustrate the design framework for various TMDI topologies and attached mass values. It is shown that the TMDI achieves enhanced structural performance and robustness to building and excitation uncertainties compared to same mass/weight TMDs.

show abstract

Section: Introductionmentioning

confidence: 99%

Optimal tuned mass-damper-inerter (TMDI) design for seismically excited MDOF structures with model uncertainties based on reliability criteria

Giaralis

Taflanidis

2017

Struct Control Health Monit

235

133

View full text Add to dashboard Cite

show abstract

“…According to the calculation method of the inertance of the fluid inerter [29], the inertance of the continuously adjustable inerter can be expressed as…”

Section: Continuously Adjustable Inerter Devicementioning

confidence: 99%

A Semiactive Skyhook‐Inertance Control Strategy Based on Continuously Adjustable Inerter

Zhang

Tian

Nie

et al. 2018

Shock and Vibration

View full text Add to dashboard Cite

This paper presents a modified skyhook-inertance control strategy which is realized through a hydraulic device of continuously adjustable inertance between sprung mass and unsprung mass. The parasitic damping inherent in the hydraulic device as well as the inertance is taken into account in the modified control strategy. Differential equation models are built to compare the performance of the semiactive suspension employing the modified control strategy with that of the passive suspension. The results demonstrate that the semiactive suspension significantly reduces sprung mass natural frequency, attenuates the resonant peak value without the penalty of deterioration at higher frequencies, and achieves over 28% improvement on ride comfort, compared with the passive suspension in unload condition. The proposed hydraulic device, together with its control strategy, can be used to reduce the variation of sprung mass natural frequency and ride comfort between unload and full-load condition.

show abstract

“…At present, four inerter types can be found: rack pinion type (Smith, 2002), ball screw type (Smith, 2008), hydraulic motor type (Wang et al, 2011), and fluid type (Swift et al, 2013). In 2005, an inerter was first applied on an F1 racing car, and the handling and tire grip performance were much improved (Chen et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Principle Study of a Semi-active Inerter Featuring Magnetorheological Effect

et al. 2019

View full text Add to dashboard Cite

Inerters are two-terminal mass elements in which the forces applied at the terminals are proportional to relative acceleration between the nodes. The volume and weight of inerters are much smaller than those of any conventional mass element for the same force, which is beneficial for engineering applications. The inerter in mechanical systems corresponds completely to the capacitor in electrical systems, which makes it more convenient to do related investigations based on mechanical-electrical analogies. 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. 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 are tunable via the applied current. The mathematical model and the mechanical performance of the SAI are established and tested, respectively. 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. 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.

show abstract

Design and modelling of a fluid inerter

Cited by 209 publications

References 7 publications

Optimal tuned mass-damper-inerter (TMDI) design for seismically excited MDOF structures with model uncertainties based on reliability criteria

Optimal tuned mass-damper-inerter (TMDI) design for seismically excited MDOF structures with model uncertainties based on reliability criteria

A Semiactive Skyhook‐Inertance Control Strategy Based on Continuously Adjustable Inerter

Principle Study of a Semi-active Inerter Featuring Magnetorheological Effect

Contact Info

Product

Resources

About