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Publications (10 of 42) Show all publications
Perricone, G., Matejka, V., Alemani, M., Valota, G., Bonfanti, A., Ciotti, A., . . . Ibrahim, M. (2018). A concept for reducing PM10 emissions for car brakes by 50%. Wear, 396, 135-145
Open this publication in new window or tab >>A concept for reducing PM10 emissions for car brakes by 50%
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2018 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 396, p. 135-145Article in journal (Refereed) Published
Abstract [en]

With regard to airborne particles with an aerodynamic diameter of less than 10 mu m (PM10), in countries in the European Union, the mass of brake emissions equals approximately 8-27% of the total traffic-related emissions. Using a research methodology combining tests at different scale levels with contact mechanics simulations and PM10 chemical characterization, the REBRAKE EU-financed project had the following aims: i) to demonstrate the possibility of reducing the PM10 fraction of the airborne particulate from brake wear by 50 wt%; ii) to enhance the general understanding on the physical and chemical phenomena underlying the brake wear process. The results achieved so far indicate that it is possible to design a disc brake system for a European standard car affording at least a 32 wt% PM10 emission reduction using a standard European pad and a heat-treated rotor. A further reduction to 65 wt% PM10 emission could be achieved with NAO pad material and the same heat-treated disc.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA, 2018
Keywords
Brakes, Non-exhaust emissions, Airborne particles, Simulation, Pin-on-disc test, Dynamometer test
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Identifiers
urn:nbn:se:kth:diva-222167 (URN)10.1016/j.wear.2017.06.018 (DOI)000422803000013 ()
Note

QC 20180205

Available from: 2018-02-05 Created: 2018-02-05 Last updated: 2018-02-05Bibliographically approved
Williamsson, D., Sellgren, U. & Söderberg, A. (2018). A HUNT FOR THE HIDDEN REASONS BEHIND A PRODUCT ARCHITECTURE. In: : . Paper presented at The 20th International DSM Conference (pp. 93-103). The Design Society
Open this publication in new window or tab >>A HUNT FOR THE HIDDEN REASONS BEHIND A PRODUCT ARCHITECTURE
2018 (English)Conference paper, Published paper (Refereed)
Abstract [en]

A modular product architecture is a strategic means to deliver external variety and internal commonality. In this paper, a heavy duty modular gearbox architecture is represented and analyzed. In focus is re-engineering of hidden technical complexity and business strategy concerns behind an existing product architecture. The architecture of the investigated gearbox is represented and analyzed with a Product Architecture DSM and the Integrated Modularization Method (IMM). Furthermore, a Cluster Match Matrix (CMM) is proposed as a means to compare multiple clustering results. The case study indicates that the IMM methodology and CMM can be used for analyzing and finding the explicit and/or implicit reason for a targeted existing product architecture.

Place, publisher, year, edition, pages
The Design Society, 2018
Keywords
Product Architecting, Integrated Modularization, DSM, MFD, IMM
National Category
Other Mechanical Engineering
Research subject
Machine Design
Identifiers
urn:nbn:se:kth:diva-244473 (URN)
Conference
The 20th International DSM Conference
Available from: 2019-02-21 Created: 2019-02-21 Last updated: 2019-02-22
Williamsson, D., Sellgren, U. & Söderberg, A. (2018). Product Architecture Transition in a Modular Cyber-Physical Truck. In: ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference: . Paper presented at 38th Computers and Information in Engineering Conference. ASME Press, Volume 1A, Article ID DETC2018-85364.
Open this publication in new window or tab >>Product Architecture Transition in a Modular Cyber-Physical Truck
2018 (English)In: ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, ASME Press, 2018, Vol. Volume 1A, article id DETC2018-85364Conference paper, Published paper (Refereed)
Abstract [en]

A modular product architecture is a strategic means to deliver external variety and internal commonality. In this paper, we propose a new clustering based method for product modularization that integrates product complexity and company business strategies. The proposed method is logically verified by a studied industrial case, where the architecture of a heavy truck driveline is analyzed in terms of how it has evolved over a couple of decades, due to changed business strategies and the evolution of new technology. The presented case indicates that the new methodology is capable of identifying and proposing reasonable module candidates that address product complexity as well as company-specific strategies. Furthermore, the case study clearly shows that the business strategic reasons for a specific architecture can be found by analyzing how sensitive the clusters are to changes in the module drivers.

Place, publisher, year, edition, pages
ASME Press, 2018
Keywords
Business Strategy, Clustering, Complexity, DSM, Integrated Modularization, MFD, Product Architecting
National Category
Other Mechanical Engineering
Research subject
Machine Design
Identifiers
urn:nbn:se:kth:diva-244470 (URN)10.1115/DETC2018-85364 (DOI)2-s2.0-85056863711 (Scopus ID)9780791851722 (ISBN)
Conference
38th Computers and Information in Engineering Conference
Available from: 2019-02-21 Created: 2019-02-21 Last updated: 2019-02-22Bibliographically approved
Williamsson, D., Sellgren, U. & Söderberg, A. (2018). PRODUCT ARCHITECTURE TRANSITION IN AN EVOLVING MULTI-BRAND ORGANISATION. In: : . Paper presented at 15th International Design Conference (pp. 929-940). Glasgow
Open this publication in new window or tab >>PRODUCT ARCHITECTURE TRANSITION IN AN EVOLVING MULTI-BRAND ORGANISATION
2018 (English)Conference paper, Published paper (Refereed)
Abstract [en]

A modular architecture is a strategic means to deliver external variety and internal commonality. A methodology for product modularization that integrates complexity and strategies is proposed and logically verified with an industrial case from the heavy truck business area. The case study indicates that the new methodology is capable of identifying and proposing reasonable module candidates that address product complexity as well as company specific strategies.

Place, publisher, year, edition, pages
Glasgow: , 2018
Keywords
Product architecture, Design Structure Matrix (DSM), Variant management, Characteristics and properties
National Category
Other Mechanical Engineering
Research subject
Machine Design
Identifiers
urn:nbn:se:kth:diva-244469 (URN)10.21278/idc.2018.0366 (DOI)
Conference
15th International Design Conference
Available from: 2019-02-21 Created: 2019-02-21 Last updated: 2019-02-22
Alemani, M., Wahlström, J., Matějka, V., Metinöz, I., Söderberg, A., Perricone, G. & Olofsson, U. (2018). Scaling effects of measuring disc brake airborne particulate matter emissions – A comparison of a pin-on-disc tribometer and an inertia dynamometer bench under dragging conditions. Proceedings of the Institution of mechanical engineers. Part J, journal of engineering tribology
Open this publication in new window or tab >>Scaling effects of measuring disc brake airborne particulate matter emissions – A comparison of a pin-on-disc tribometer and an inertia dynamometer bench under dragging conditions
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2018 (English)In: Proceedings of the Institution of mechanical engineers. Part J, journal of engineering tribology, ISSN 1350-6501, E-ISSN 2041-305XArticle in journal (Refereed) Epub ahead of print
Abstract [en]

An important contributor to non-exhaust emissions in urban areas is airborne particulate matter originating from brake systems. A well-established way to test such systems in industry is to use inertia dynamometer benches; although they are quite expensive to run. Pin-on-disc tribometers, on the other hand, are relatively cheap to run, but simplify the real system. The literature indicates promising correlations between these two test stands with regard to measured airborne number distribution. Recent studies also show a strong dependency between the airborne number concentration and the disc temperature. However, a direct comparison that also takes into account temperature effects is missing. The aim of this paper is, therefore, to investigate how the transition temperature is affected by the different test scales, under dragging conditions, and the effects on total concentration and size distribution. New and used low-steel pins/pads were tested against cast iron discs/rotors on both the aforementioned test stands, appositely designed for particulate emission studies. A constant normal load and constant rotational velocity were imposed in both test stands. Results show that a transition temperature can always be identified. However, it is influenced by the test scale and the frictional pair status. Nevertheless, emissions are assessed similarly when an equivalent frictional pair status is analysed (e.g. run-in). Further investigations for fully run-in samples on the pin-on-disc should be performed in order to finally assess the possibility of using the tribometers for the initial assessment of different friction materials.

Place, publisher, year, edition, pages
Sage Publications, 2018
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Identifiers
urn:nbn:se:kth:diva-224833 (URN)10.1177/1350650118756687 (DOI)000450295800005 ()2-s2.0-85044042990 (Scopus ID)
Projects
REBRAKELOWBRASYS
Funder
EU, FP7, Seventh Framework Programme, 324385EU, Horizon 2020, 636592
Note

QC 20180328

Available from: 2018-03-26 Created: 2018-03-26 Last updated: 2018-12-07Bibliographically approved
Williamsson, D., Sellgren, U. & Söderberg, A. (2018). The hunt for proper relation weights in product architecture clustering. In: Proceedings of NordDesign 2018, Linköping, Sweden, 14th - 17th August 2018: . Paper presented at NordDesign 2018, Linköping, Sweden, 14th - 17th August 2018. The Design Society
Open this publication in new window or tab >>The hunt for proper relation weights in product architecture clustering
2018 (English)In: Proceedings of NordDesign 2018, Linköping, Sweden, 14th - 17th August 2018, The Design Society, 2018Conference paper, Published paper (Refereed)
Abstract [en]

A common view is that a module should be a functional building block, with well-defined and standardized interfaces between the modules, and that it should be chosen for company specific reasons. A modular product architecture is a strategic means to deliver external variety and internal commonality. Today, multiple modularisation methodologies exist to support the highly complex task to identify module candidates in the product architecting phase. One methodology is Modular Function Deployment with the Modular Indication Matrix (MIM) representation of company-specific module drivers. Other methodologies, such as Design Structure Matrix (DSM) clustering, may be used to identify modules from a technical complexity point of view. In this paper, the performance of the newly proposed Integrated Modularization Methodology (IMM), which is based on clustering of a strategically adapted DSM, is conceptually verified. The core of the IMM is to transfer company specific module drivers from the MIM into the component-DSM, before clustering this hybrid representation. A re-architecting industrial case, where a truck manufacturer with a unique business strategy had to redesign parts of its modular gearbox architecture to also become a First-Tier OEM-supplier to another large truck manufacturer, is used as test bench. Reverse engineering of the investigated gearbox architecture indicates that the current modules are most likely not only based on technical complexity concerns. They are rather derived from different types of business strategic aspects, e.g. outsourcing. The study also indicates that the IMM is capable of identifying clusters without strategic conflicts, and with the most similar result to the analysed architecture, which is assumed to be based on expert judgements.

Place, publisher, year, edition, pages
The Design Society, 2018
Keywords
Product Architecting, Modularization, Integrated Modularization, DSM, MFD
National Category
Other Mechanical Engineering
Research subject
Machine Design
Identifiers
urn:nbn:se:kth:diva-244472 (URN)978-91-7685-185-2 (ISBN)
Conference
NordDesign 2018, Linköping, Sweden, 14th - 17th August 2018
Note

QC 20190222

Available from: 2019-02-21 Created: 2019-02-21 Last updated: 2019-02-22Bibliographically approved
Wahlström, J., Matějka, V., Lyu, Y. & Söderberg, A. (2017). Contact pressure and sliding velocity maps of the friction, wear and emission from a low-metallic/cast-iron disc brake contact pair. Tribology in Industry, 39(4), 460-470
Open this publication in new window or tab >>Contact pressure and sliding velocity maps of the friction, wear and emission from a low-metallic/cast-iron disc brake contact pair
2017 (English)In: Tribology in Industry, ISSN 0354-8996, Vol. 39, no 4, p. 460-470Article in journal (Refereed) Published
Abstract [en]

Particulate matter with an aerodynamic diameter less than 10 µm (PM10) from car disc brakes contribute up to 50% of the total non-exhaust emissions from road transport in the EU. These emissions come from the wear of the pad and rotor contact surfaces. Yet few studies have reported contact pressures and offered sliding speed maps of the friction, wear, and particle emission performance of disc brake materials at a material level. Such maps are crucial to understanding material behaviour at different loads and can be used as input data to numerical simulations. A low-metallic pad and grey cast-iron rotor contact pair commonly used today in passenger car disc brakes was studied using a pin-on-disc tribometer at twelve contact pressure and sliding speed combinations. Maps of the coefficient of friction, specific wear rate, particle number, and mass rate are presented and discussed.

Place, publisher, year, edition, pages
Faculty of Engineering, University of Kragujevac, 2017
Keywords
Disc brake, Emissions, Friction, Maps, Pin-on-disc, Wear
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Identifiers
urn:nbn:se:kth:diva-223091 (URN)10.24874/ti.2017.39.04.05 (DOI)2-s2.0-85038439180 (Scopus ID)
Note

QC 20180214

Available from: 2018-02-14 Created: 2018-02-14 Last updated: 2018-02-14Bibliographically approved
Lyu, Y., Wahlström, J., Matějka, V. & Söderberg, A. (2017). Ranking of conventional and novel disc brake materials with respect to airborne particle emissions. In: Eurobrake 2017: . Paper presented at Eurobrake 2017.
Open this publication in new window or tab >>Ranking of conventional and novel disc brake materials with respect to airborne particle emissions
2017 (English)In: Eurobrake 2017, 2017Conference paper, Published paper (Refereed)
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Design
Identifiers
urn:nbn:se:kth:diva-223387 (URN)
Conference
Eurobrake 2017
Note

QC 20180226

Available from: 2018-02-20 Created: 2018-02-20 Last updated: 2018-02-26Bibliographically approved
Lindén, J., Söderberg, A. & Sellgren, U. (2016). Reliability Assessment with Varying Operating Conditions. In: Procedia CIRP: . Paper presented at 26th CIRP Design Conference, 2016, 15 June 2016 through 17 June 2016 (pp. 796-801). Elsevier
Open this publication in new window or tab >>Reliability Assessment with Varying Operating Conditions
2016 (English)In: Procedia CIRP, Elsevier, 2016, p. 796-801Conference paper, Published paper (Refereed)
Abstract [en]

Product reliability is a systems property that cannot be attributed to a single component. It is in many cases related to interactions between components, or to interactions between humans and the technical system. Product functionality includes both technical functions, like structural integrity and interactive functions, like ergonomics. Reliability assessments in the early stages of the development process are valuable, since design changes cost significantly less if made early. System reliability tests can only be made towards the end of the development process, but early estimates can be based on test data from component tests and function tests. Operating conditions often vary between component tests and system tests. Therefore, reliability assessments where data from one situation is used to predict reliability in a different situation must take this variation into account. We investigate how this can be done for both technical and interactive functions. The study is made in the context of system reliability for heavy trucks, where both technical functions and interactive functions affect product reliability. Two cases have been assembled from test data, one concerning a component on a truck cab, the other an interactive function of a truck. Two reliability estimation methods have been evaluated to investigate if the methods can be used for interactive functions as well as for technical functions. We conclude that a method for reliability estimation of interactive functions must be able to model increased uncertainty due to intrapersonal variation.

Place, publisher, year, edition, pages
Elsevier, 2016
Keywords
interactive function, operating conditions, reliability estimation, Automobile testing, Ergonomics, Reliability analysis, Testing, Trucks, Development process, Interactive functions, Intra-personal variations, Operating condition, Product reliability, Reliability assessments, Technical functions, Reliability
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-195425 (URN)10.1016/j.procir.2016.04.139 (DOI)000387666600133 ()2-s2.0-84986626705 (Scopus ID)
Conference
26th CIRP Design Conference, 2016, 15 June 2016 through 17 June 2016
Note

QC 20161128

Available from: 2016-11-28 Created: 2016-11-03 Last updated: 2017-06-02Bibliographically approved
Alemani, M., Olofsson, U., Perricone, G., Söderberg, A., Wahlström, J. & Ciotti, A. (2015). A STUDY ON THE LOAD LEVEL INFLUENCE ON PARTICULATE MATTER EMISSIONS FROM THE SLIDING CONTACT BETWEEN A LOW STEEL FRICTION MATERIAL AND CAST IRON. In: Eurobrake 2015: . Paper presented at Eurobrake 2015. Dresden
Open this publication in new window or tab >>A STUDY ON THE LOAD LEVEL INFLUENCE ON PARTICULATE MATTER EMISSIONS FROM THE SLIDING CONTACT BETWEEN A LOW STEEL FRICTION MATERIAL AND CAST IRON
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2015 (English)In: Eurobrake 2015, Dresden, 2015Conference paper, Published paper (Refereed)
Abstract [en]

In 2013 the road transport contribution to PM10 and PM2.5 emissions in the EU region counted for 11% and 16% respectively of the total emission. Related to these road transport emissions, the non-exhaust fraction equals almost the 50% of the exhaust one. A major contributor to the non-exhaust fraction is the wear particles generated from disc brakes.

The purpose of this paper is to investigate how different load levels, i.e. contact pressures, can affect the particle concentration, the particle size distribution as well as the temperature distribution of a typical pad to rotor material combination (low-steel pad material and cast iron disc) found in European braking system.

Tests were conducted in a pin-on-disc machine, specially designed for airborne particulate research. A clean chamber technique was used ensuring that measured airborne particulates were only generated from the sliding contact in the pin-on-disc machine. In addition, an insulating plate placed between the disc and the rotating base allows the system to reach up to 350°C, without using any external heating source. The same constant sliding speed was used for all tests (1.3 m/s) ensuring the same sliding distance with the specific test time of 3h. The testing time was chosen to get a long enough steady state periods. The load was applied to the contacting pairs with dead weights varying from 1 kg to 7 kg giving an average contact pressure range of 0.29 MPa to 1.95 MPa. The concentration and the size distribution were measured using an Electrical Low Pressure Impactor (Dekati ®ELPI+) covering a size range from 6 nm to 10 μm. The frictional heating was measured using thermocouples placed 3 mm from the contact surface in both pin and disc. Also the friction coefficient and the wear rate were determined using a load cell measuring the frictional load and a LVDT measuring the wear depth change.

The results show a stable stationary particle generation for the low loads compared to a more transient response with short periods of high concentration levels for the higher loads. This gives evidence of a temperature limit in the production of airborne particulates generated from disc brake material combinations. Above this temperature limit around 200°C a sharp increase in the total concentration number can be detected. Future studies will be devoted to a study of different pad to rotor material combinations.

Place, publisher, year, edition, pages
Dresden: , 2015
Keywords
Particulate matter, Pin-on-disc, Friction material, Wear, Disc brakes
National Category
Engineering and Technology
Research subject
Machine Design; Engineering Mechanics
Identifiers
urn:nbn:se:kth:diva-208686 (URN)978-0-9572076-6-0 (ISBN)
Conference
Eurobrake 2015
Projects
REBRAKE - G.A. 324385
Note

QC 20170613

Available from: 2017-06-11 Created: 2017-06-11 Last updated: 2017-06-13Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-4461-0209

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