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Modeling transient behavior of a mechanical system including a rolling and sliding contact
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Elements.ORCID iD: 0000-0003-4461-0209
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Elements.
2005 (English)In: Proceedings of IMECE 1005, 2005 ASME Interantional Mechanical Engineering Congress and Exposition, 2005, 229-238 p.Conference paper, Published paper (Refereed)
Abstract [en]

Thefriction and wear of rolling and sliding contacts are criticalfactors for the operation of machine elements such as bearings,gears, and cam mechanisms. In precision machines, for example, themain concern is to compensate for frictional losses, so asto improve control accuracy. In other applications it is oftendesirable to minimize friction losses to improve efficiency, though sometimeshigh friction is desired to prevent sliding and wear. Theaim of this study is to simulate the behavior ofa test equipment and show that simulations can be usedto study and optimize mechanical systems that include rolling andsliding contact. Simulations can be used to study the systemas a whole, as well as the contact conditions. Thetest equipment and the measurement procedure used are described. Inthe simulations, a contact model designed to handle transient contactconditions is integrated into a system model. The results showthat the contact strongly influences the system. The simulations showthat the use of a contact model allows the simulationof systems that contain contacts with different amounts of slip,and that such simulations can be used to study thecontact as well as the system. Surface roughness influences thecontact stiffness and is included in the simulations.

Place, publisher, year, edition, pages
2005. 229-238 p.
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-5773DOI: 10.1115/IMECE2005-80906ISI: 000243026700030Scopus ID: 2-s2.0-33646679896OAI: oai:DiVA.org:kth-5773DiVA: diva2:10263
Conference
2005 ASME International Mechanical Engineering Congress and Exposition; Orlando, FL; 5 November 2005 through 11 November 2005
Note

QC 20100811

Available from: 2006-05-22 Created: 2006-05-22 Last updated: 2016-06-09Bibliographically approved
In thesis
1. On interface modeling  with emphasis on friction
Open this publication in new window or tab >>On interface modeling  with emphasis on friction
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

The general trend toward increased use of computer models and simulations during product development has led to a need for accurate and reliable product models. The function of many products relies on contact interfaces between interacting components. To simulate the behavior of such products, accurate models of both components and interfaces are required. Depending on the purpose of the simulation, interface models of different degrees of complexity are needed. In simulation of very large systems with many interfaces, it might be computationally expensive to integrate detailed models of each individual interface. Condensed models, or abstractions, that describe the interface properties with a minimum of degrees of freedom are therefore required.

This thesis deals with mechanical interfaces with an emphasis on friction. In the four appended papers friction models are discussed in terms of condensed models, as well as in terms of more detailed contact models. The aim is to study how friction can be modeled in behavioral simulation of products and to discuss the convenience and relevance of using different types of friction models as building blocks of a system model in behavioral simulations.

Paper A presents a review of existing condensed friction models for sliding contacts under different running conditions and discusses the models from both simulation and tribological points of view.

In papers B and C a simplified contact model, called the elastic foundation model, is used to model friction in a boundary-lubricated rolling and sliding contact. The model is integrated in a dynamic rigid body model of a mechanical system, the system behavior is simulated, and the result is compared with experimental results.

Paper D discusses the application of the elastic foundation model to rough surface contact problems and investigates how the error in the elastic foundation results depends on surface roughness.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. 14 p.
Series
Trita-MMK, ISSN 1400-1179 ; 2006:08
Keyword
interface model, contact, friction, simulation, system behaviour, surface roughness, elastic foundation
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-3986 (URN)
Presentation
2006-05-19, Seminarierum A425, KTH, Brinellvägen 83, Stockholm, 09:00
Opponent
Supervisors
Note
QC 20101129Available from: 2006-05-22 Created: 2006-05-22 Last updated: 2010-11-29Bibliographically approved
2. Interface modeling - friction and wear
Open this publication in new window or tab >>Interface modeling - friction and wear
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The general trend toward increased use of computer models and simulations during product development calls for accurate and reliable product models. The function of many products relies on contact interfaces between interacting components. Simulating the behavior of such products requires accurate models of both components and interfaces. Depending on the purpose of the simulation, interface models of different degrees of detail are needed. In simulating very large systems with many interfaces, it might be computationally expensive to integrate detailed models of each individual interface. Condensed models, or abstractions, that describe the interface properties with the fewest degrees of freedom are therefore required. This thesis deals with the modeling and simulation of mechanical interfaces in a systems context. The five appended papers discuss the issue from both the simulation and tribological points of view. The aim is to study how friction and wear can be modeled in the behavioral simulation of technical systems and to discuss the convenience and applicability of using different types of models as building blocks of a system model in simulations. Paper A reviews existing friction models of sliding contacts under different running conditions. Paper B uses a simplified contact model, the elastic foundation model, to model friction in a boundary-lubricated rolling and sliding contact. The model is integrated into a dynamic rigid body model of a mechanical system, and the system behavior is simulated. Paper C discusses the application of the elastic foundation model to rough surface contact problems and investigates how the error in its results depends on surface roughness. Papers D and E address how the wear of the contact surfaces at the pad-to-rotor interface in a passenger car disc brake can be simulated using finite element analysis (FEA).

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. 20 p.
Series
Trita-MMK, ISSN 1400-1179 ; 2009:03
Keyword
Interfaces, Models, Simulation, Friction, Wear
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-9861 (URN)978-91-7415-215-9 (ISBN)
Public defence
2009-02-09, Flodissalen, Lindstedsvägen 26, Stockholm, 13:00 (English)
Opponent
Supervisors
Note
QC 20100811Available from: 2009-01-23 Created: 2009-01-20 Last updated: 2010-08-11Bibliographically approved

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