Using continuation analysis to identify shimmy-suppression devices for an aircraft main landing gear

Li, Yuan; Howcroft, Chris; Neild, Simon A; Jiang, Jason Zheng

doi:10.1016/j.jsv.2017.07.028

Cited by 46 publications

(23 citation statements)

References 33 publications

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“…Performance advantages have been identified for road vehicles (Smith and Wang 2004;Jiang et al 2015a), railway vehicles (Wang et al 2009;Wang et al 2012;Jiang et al 2015b), aircraft landing gear systems (Liu et al 2015;Li et al 2017a;Li et al 2017b), and civil engineering structures (Ikago et al 2012;Lazar et al 2014;Yang 2016;Zhang et al 2017;Makris and Kampas 2016;Bakis et al 2017). For vibration suppression of cables, the potential benefits of adding a tuned inerter damper (TID) system has been analyzed (Lazar et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Cable Vibration Suppression with Inerter-Based Absorbers

2019

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Stay cables are prone to vibrations due to their low inherent damping. This paper presents an approach for systematic identification of beneficial passive absorbers layouts consisting of damper, spring and inerter. The inerter is a one-port mechanical element with the property that the applied force is proportional to the relative acceleration between its terminals. In this work, a finite element taut cable model, with vibration absorber represented by its admittance function, is firstly established. Two performance measures, depending on the length of the cable and the forcing conditions, are introduced to assess the effect of candidate absorbers. Potential advantages of lowcomplexity inerter-based absorber layouts are then systematically investigated, with corresponding element values in these layouts identified. Building on this, the effect of series compliance is also examined for beneficial absorber layouts. It is shown that, up to a certain inertance, which depends on the stiffness of the series compliance, the performance advantages over a viscous damper can be maintained, or even enlarged in some cases, if the element values are properly tuned.

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Section: Introductionmentioning

confidence: 99%

Cable Vibration Suppression with Inerter-Based Absorbers

2019

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“…A preliminary study of the implementation of inerters to a quarter-car model [8], which used a prototype inerter, yielded improvements in ride, tyre normal load and handling of 10% or greater over conventional spring and damper based passive struts. The use of inerters has recently expanded into buildings [9][10][11], road vehicles [12][13][14], aircraft landing gear [15,16] and optical tables [17]. First proposed in 2002 in the form of a rack and pinion design [6], other inerter designs have been proposed such as the ballscrew inerter used in Formula 1 [18], fluid inerters [19][20][21] and hydraulic inerters [22].…”

Section: Introductionmentioning

confidence: 99%

Using an inerter-based suspension to improve both passenger comfort and track wear in railway vehicles

Lewis

Jiang

Neild

et al. 2019

Vehicle System Dynamics

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There is an increasing desire in the railway industry to improve the longevity of wheels and rails without reducing performance in other ways (e.g. worsening passenger comfort). One way of reducing track and wheel wear is to reduce the primary yaw stiffness, significantly diminishing the costs associated with maintenance and emergency repairs, resulting however in reduced passenger comfort and high-speed stability. This paper, using a two-axle railway vehicle case study, demonstrates the potential of using passive, inerter-based suspensions to concurrently improve ride comfort and reduce track wear. The industrial parameter Tγ is used to quantify the frictional energy lost at the contact patch under curving conditions, and the lateral RMS carbody acceleration is used to quantify passenger comfort under straight running conditions, with lateral track disturbances taken from real track data. Optimisation results conclude that, with the default yaw stiffness value, compared with the default springdamper configuration in the primary lateral suspension, employing beneficial inerter-based configurations can improve passenger comfort by up to 43%. If the yaw stiffness is reduced such that the track wear is improved, similar improvements in passenger comfort can still be achieved with lateral inerter-based suspensions; for example, an improvement of 33% can still be achieved with a 50% reduction in yaw stiffness. Furthermore, when an inerter-based lateral suspension is used together with a Hall-Bush longitudinal suspension, the passenger comfort rises to 40%, which relates to a 25% improvement when compared with a non-inerter lateral plus Hall-Bush longitudinal setup.

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“…The constant of proportionality between the force and the relative acceleration is termed inertance, with dimensions of mass. Theoretical performance advantages of inerter-based suspension systems and vibration absorbers have been identified for a wide range of mechanical systems, including road vehicles [25,26,27], railway vehicles [28,29,30], aircraft landing gear systems [31,32,33], building structures [34,35,36] and bridge cables [37]. Research efforts have also been made regarding physical realizations of inerters, which can take different forms, including rack and pinion [38], ball-screw [39], hydraulic [40] and more recently introduced fluid inerters [41,42].…”

Section: Introductionmentioning

confidence: 99%

Identification of optimum cable vibration absorbers using fixed-sized-inerter layouts

Luo

Macdonald

Jiang

2019

Mechanism and Machine Theory

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Cables are widely used in cable-stayed bridges and other civil engineering structures, but they often experience large amplitude vibrations due to their low inherent damping. Recent studies have shown that inerter-based vibration absorbers with two or three elements can provide significant performance improvements with very large inertance. Such large inertance leads to difficulties in physical implementation. Meanwhile, alternative inerter-based layouts with more elements could potentially provide better performance with significantly smaller inertance. However, studying these configurations one by one is impractical because the number of possible absorber layouts increases exponentially with the number of elements. This paper, using two types of fixed-sized-inerter (FSI) layouts, presents an efficient and systematic optimum configuration identification methodology. A simplification procedure is also adopted to then simplify the obtained configurations while not compromising the performance gains. Using this approach, it is shown that when the number of elements is increased from three to four, significant enhancement can be obtained even with small inertance values. The proposed approach can also be applied to vibration problems of other mechanical structures and with other performance criteria.

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Using continuation analysis to identify shimmy-suppression devices for an aircraft main landing gear

Cited by 46 publications

References 33 publications

Cable Vibration Suppression with Inerter-Based Absorbers

Cable Vibration Suppression with Inerter-Based Absorbers

Using an inerter-based suspension to improve both passenger comfort and track wear in railway vehicles

Identification of optimum cable vibration absorbers using fixed-sized-inerter layouts

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