Improving the track friendliness of a four-axle railway vehicle using an inertance-integrated lateral primary suspension

Tim Lewis, Yuan Li, Gareth Tucker, Jason Jiang, Y. Zhao, Simon Neild, Malcom Smith, Roger Goodall, Neil Dinmore

Research output: Contribution to journalArticle

Abstract

Improving the track friendliness of a railway vehicle can benefit the railway industry significantly. Rail surface damage in curves can be reduced by using vehicles with a lower Primary Yaw Stiffness (PYS); however, this can reduce high-speed stability and worsen ride comfort. Previous studies have shown that this trade-off between track friendliness and passenger comfort can be successfully combated by using an inerter in the primary suspension; however, these utilise simplified vehicle models, contact models, and track inputs. Considering a realistic four-axle passenger vehicle model, this paper investigates the extent to which the PYS can be reduced with inertance-integrated primary lateral suspensions without increasing root-mean-square (RMS) carbody lateral accelerations. The vehicle model, with these enhanced suspensions, has been created in VAMPIRE, with the dynamics being captured over a range of vehicle velocities and equivalent conicities. Based on systematic optimisations using network-synthesis theory, several beneficial inertance-integrated configurations are identified, and the PYS can be reduced by up to 47% compared to the default vehicle (a potential Network Rail Variable Usage Charge saving of 26%), without increasing RMS carbody lateral accelerations. Further simulations are performed to investigate the vehicle’s performance in curve transitions and when subject to one-off peak lateral track irregularities.
LanguageEnglish
Number of pages20
JournalVehicle System Dynamics
Early online date12 Sep 2019
DOIs
Publication statusE-pub ahead of print - 12 Sep 2019

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Axles
Stiffness
Rails
Vehicle performance
Industry

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title = "Improving the track friendliness of a four-axle railway vehicle using an inertance-integrated lateral primary suspension",
abstract = "Improving the track friendliness of a railway vehicle can benefit the railway industry significantly. Rail surface damage in curves can be reduced by using vehicles with a lower Primary Yaw Stiffness (PYS); however, this can reduce high-speed stability and worsen ride comfort. Previous studies have shown that this trade-off between track friendliness and passenger comfort can be successfully combated by using an inerter in the primary suspension; however, these utilise simplified vehicle models, contact models, and track inputs. Considering a realistic four-axle passenger vehicle model, this paper investigates the extent to which the PYS can be reduced with inertance-integrated primary lateral suspensions without increasing root-mean-square (RMS) carbody lateral accelerations. The vehicle model, with these enhanced suspensions, has been created in VAMPIRE, with the dynamics being captured over a range of vehicle velocities and equivalent conicities. Based on systematic optimisations using network-synthesis theory, several beneficial inertance-integrated configurations are identified, and the PYS can be reduced by up to 47{\%} compared to the default vehicle (a potential Network Rail Variable Usage Charge saving of 26{\%}), without increasing RMS carbody lateral accelerations. Further simulations are performed to investigate the vehicle’s performance in curve transitions and when subject to one-off peak lateral track irregularities.",
keywords = "Inertance-integrated networks, suspension, stability, ride comfort, railway vehicle, track friendly, vibration",
author = "Tim Lewis and Yuan Li and Gareth Tucker and Jason Jiang and Y. Zhao and Simon Neild and Malcom Smith and Roger Goodall and Neil Dinmore",
year = "2019",
month = "9",
day = "12",
doi = "10.1080/00423114.2019.1664752",
language = "English",
journal = "Vehicle System Dynamics",
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publisher = "Taylor and Francis Ltd.",

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Improving the track friendliness of a four-axle railway vehicle using an inertance-integrated lateral primary suspension. / Lewis, Tim; Li, Yuan; Tucker, Gareth; Jiang, Jason ; Zhao, Y.; Neild, Simon; Smith, Malcom; Goodall, Roger; Dinmore, Neil.

In: Vehicle System Dynamics, 12.09.2019.

Research output: Contribution to journalArticle

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AU - Li, Yuan

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AU - Smith, Malcom

AU - Goodall, Roger

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AB - Improving the track friendliness of a railway vehicle can benefit the railway industry significantly. Rail surface damage in curves can be reduced by using vehicles with a lower Primary Yaw Stiffness (PYS); however, this can reduce high-speed stability and worsen ride comfort. Previous studies have shown that this trade-off between track friendliness and passenger comfort can be successfully combated by using an inerter in the primary suspension; however, these utilise simplified vehicle models, contact models, and track inputs. Considering a realistic four-axle passenger vehicle model, this paper investigates the extent to which the PYS can be reduced with inertance-integrated primary lateral suspensions without increasing root-mean-square (RMS) carbody lateral accelerations. The vehicle model, with these enhanced suspensions, has been created in VAMPIRE, with the dynamics being captured over a range of vehicle velocities and equivalent conicities. Based on systematic optimisations using network-synthesis theory, several beneficial inertance-integrated configurations are identified, and the PYS can be reduced by up to 47% compared to the default vehicle (a potential Network Rail Variable Usage Charge saving of 26%), without increasing RMS carbody lateral accelerations. Further simulations are performed to investigate the vehicle’s performance in curve transitions and when subject to one-off peak lateral track irregularities.

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