Inertance-Integrated Primary Suspension Optimisation on an Industrial Railway Vehicle Model

Timothy Lewis, Yuan Li, Gareth Tucker, Zheng Jiang, Simon Neild, Malcolm C. Smith, Roger Goodall, Simon Iwnicki, Neil Dinmore

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Improving the track friendliness of a railway vehicle is highly beneficial to the rail industry, as it substantially increases its cost effectiveness. Rail surface damage under curving conditions can be reduced by using vehicles with a reduced Primary Yaw Stiffness (PYS); however, a lower PYS often leads to a reduction in high-speed stability and can negatively impact ride comfort. Previous studies have suggested that this trade-off, between track friendliness and passenger comfort, can be successfully improved by using an inerter in the primary suspension; however, these studies used simplified two-axle vehicles and simplified contact models, and track inputs. Considering a more realistic four-axle passenger vehicle model, this paper investigates the extent to which the PYS can be reduced using inertance-integrated primary lateral suspensions without increasing Root Mean Square (RMS) lateral carbody accelerations when running over a 5 km example track (with a number of vertical, lateral and longitudinal irregularities, and gauge variations). The vehicle, with inertance-integrated primary lateral suspensions, has been modelled in VAMPIRE®, and the vehicle dynamics are captured over a range of different velocities and wheel-rail equivalent conicities. Several inertance-integrated suspensions are optimised, leading to permissible PYS reductions of up to 47% compared to the original vehicle, whilst lateral carbody accelerations remain at acceptable levels. This level of PYS reduction would result in a potential Network Rail Variable Usage Charge saving of 26%.
Original languageEnglish
Title of host publicationAdvances in Dynamics of Vehicles on Roads and Tracks
Subtitle of host publicationProceedings of the 26th Symposium of the International Association of Vehicle System Dynamics, IAVSD 2019
EditorsMatthijs Klomp, Fredrik Bruzelius, Jens Nielsen, Angela Hillemyr
Number of pages10
ISBN (Electronic)9783030380779
ISBN (Print)9783030380762, 3030380769
Publication statusPublished - 14 Feb 2020
Event26th IAVSD International Symposium on Dynamics of Vehicles on Roads and Tracks - Gothenburg, Sweden
Duration: 12 Aug 201916 Aug 2019
Conference number: 26

Publication series

NameLecture Notes in Mechanical Engineering
ISSN (Print)2195-4356
ISSN (Electronic)2195-4364


Conference26th IAVSD International Symposium on Dynamics of Vehicles on Roads and Tracks
Abbreviated titleIAVSD 2019
Internet address


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