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Studying Road Roughness Effect on Rolling Resistance Using Brush Tyre Model and Self-Affine Fractal Surfaces
(Department of Mechanical Engineering, University of Tokyo)
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Fordonsdynamik. KTH, Skolan för teknikvetenskap (SCI), Centra, VinnExcellence Center for ECO2 Vehicle design. (Department of Mechanical Engineering, University of Tokyo)ORCID-id: 0000-0001-6339-1043
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Fordonsdynamik. KTH, Skolan för teknikvetenskap (SCI), Centra, VinnExcellence Center for ECO2 Vehicle design.ORCID-id: 0000-0001-8928-0368
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Fordonsdynamik. KTH, Skolan för teknikvetenskap (SCI), Centra, VinnExcellence Center for ECO2 Vehicle design.ORCID-id: 0000-0002-1426-1936
Visa övriga samt affilieringar
2016 (Engelska)Ingår i: The Dynamics of Vehicles on Roads and Tracks - Proceedings of the 24th Symposium of the International Association for Vehicle System Dynamics, IAVSD 2015, CRC Press, 2016, s. 273-280Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

While there are many tyre and vehicle dependent factors that affect the rollingresistance, the road properties play also an influential role in the overall resistance on the vehicle.The aim of this study is to develop amodel that can estimate the effect of road roughness on rollingresistance of tyres where both the texture-dependent and independent factors are contributing tooverall rolling resistance. In this paper, a method based on the self-affine fractal surfaces is usedto model realistic road characteristics in order to couple it with a brush based tyre model to beable to study the influence of road roughness on tyre rolling resistance. The simulation resultssuggest that the rolling resistance increases with increased RMS-value and both the macro- andthe micro-texture have an influence on the rolling resistance while the macro-texture effect is moreinfluential. The results of this paper can be related to the estimation of fuel economy on differentroad textures, from macro-texture to micro-texture and further optimisation of road surfaces.

Ort, förlag, år, upplaga, sidor
CRC Press, 2016. s. 273-280
Nyckelord [en]
Fractals, Fuel economy, Laminates, Roads and streets, Rolling resistance, Surface roughness, System theory, Tires, Vehicles, Dependent factors, Micro texture, Optimisations, Resistance increase, Road roughness, Road surfaces, Road textures, Self-affine fractal surfaces
Nationell ämneskategori
Farkostteknik
Forskningsämne
Farkostteknik; Transportvetenskap
Identifikatorer
URN: urn:nbn:se:kth:diva-175819ISI: 000385792300029Scopus ID: 2-s2.0-84973659659ISBN: 9781138028852 (tryckt)OAI: oai:DiVA.org:kth-175819DiVA, id: diva2:862530
Konferens
The 24th International Symposium on Dynamics of Vehicles on Roads and Tracks, 17th - 21st August 2015, Graz, Austria
Forskningsfinansiär
VINNOVATrenOp, Transport Research Environment with Novel Perspectives
Anmärkning

QC 20161121

Tillgänglig från: 2015-10-22 Skapad: 2015-10-22 Senast uppdaterad: 2017-05-29Bibliografiskt granskad
Ingår i avhandling
1. Exploiting over-actuation to reduce tyre energy losses in vehicle manoeuvres
Öppna denna publikation i ny flik eller fönster >>Exploiting over-actuation to reduce tyre energy losses in vehicle manoeuvres
2017 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Due to environmental and economic challenges road vehicles need bettersolutions to reduce energy consumption. Improvement in tyre rolling e-ciency is one of the key enablers for lower energy consumption. The shifttowards electrication and intelligent driving creates new opportunities todevelop energy-ecient vehicles. For instant over-actuated vehicles whichenables dierent objectives such as safety, performance and energy e-ciency to be fullled during a manoeuvre. The objective of this thesis is todevelop a simulation environment to simulate the energy dissipated fromthe tyre in order to investigate the potential to controlling dierent chassisparameters to reduce rolling losses during driving.The rst part of the thesis is dedicated to develop a high-delity semi-physical non-linear tyre model called the Extended Brush Tyre Model(EBM) to be used for energy studies in vehicle dynamics simulations andlater answer whether it is reasonable to believe that there is any potentialto reduce the rolling loss, and thereby energy consumption, using over-actuation.In the second part of the thesis the benets of over-actuation are invest-igated to enable rolling loss reduction. A control strategy using camber-sideslip control (CSC) is proposed. The allocation problem is solved in the formof an optimisation problem using Dynamics Programming (DP) and ModelPredictive Control (MPC). Exploiting the function for a chosen vehicle ina simulation environment shows a signicant improvement of about 60% inrolling loss reduction while maintaining path tracking. Also by using thisfunction the tyre forces can be distributed more evenly while maintainingthe global force, which results in an increase in the available tyre forcesthat is especially benecial when driving at the limit. It is revealed thatoptimising the vehicle manoeuvre from an energy perspective is sometimesin con ict with the safety demand, thus the energy and safety criteria needto be considered simultaneously during optimisation.Finally, experimental studies using an over-actuated concept vehicleconrmed that the CSC function can reduce overall energy consumptionduring low velocity manoeuvres up to about 13%. By increasing the speed,the saving potential decreases but the contribution is nonetheless of signi-cance. The developed simulation environment, including the EBM, willenable future studies of dierent solutions using over-actuation to reducerolling losses in dierent types of vehicles and driving tasks.

Ort, förlag, år, upplaga, sidor
KTH Royal Institute of Technology, 2017. s. 80
Serie
TRITA-AVE, ISSN 1651-7660 ; 2017:35
Nationell ämneskategori
Farkostteknik
Forskningsämne
Farkostteknik
Identifikatorer
urn:nbn:se:kth:diva-207787 (URN)978-91-7729-441-2 (ISBN)
Disputation
2017-06-13, D3, Lindstedtsvägen 5, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning

QC 20170524

Tillgänglig från: 2017-05-24 Skapad: 2017-05-24 Senast uppdaterad: 2017-06-29Bibliografiskt granskad

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Davari, Mohammad MehdiDrugge, LarsJerrelind, JennyStensson Trigell, Annika

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Davari, Mohammad MehdiDrugge, LarsJerrelind, JennyStensson Trigell, Annika
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FordonsdynamikVinnExcellence Center for ECO2 Vehicle design
Farkostteknik

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