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On interface modeling  with emphasis on friction
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).ORCID iD: 0000-0003-4461-0209
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 [en]
interface model, contact, friction, simulation, system behaviour, surface roughness, elastic foundation
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-3986OAI: oai:DiVA.org:kth-3986DiVA: diva2:10265
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
List of papers
1. Frictions models for sliding dry, boundary and mixed lubricated contacts
Open this publication in new window or tab >>Frictions models for sliding dry, boundary and mixed lubricated contacts
2007 (English)In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 40, 580-587 p.Article in journal (Refereed) Published
Abstract [en]

Friction, lubrication, and wear have a strong influence on the performance and behavior of mechanical systems. This paper deals with different friction models for sliding contacts running under different conditions. The models presented are suited to different situations, depending on the type of contact, running conditions, and the behavior of interest. The models will be discussed from simulation and tribological points of view. The different types of friction models considered are:

center dot friction models for transient sliding under dry, boundary and mixed lubrication conditions,

center dot friction models for micro-displacements of engineering surfaces subjected to transient sliding,

center dot friction models often used in the simulation and control of technical systems,

center dot combined friction models that represent physical behaviors fairly well but are also suitable for use in simulating systems,

center dot friction models that take into account the stochastic nature of interacting surface asperities

Keyword
friction; model; sliding contact; Coulomb; Dahl; Stribeck
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-5771 (URN)10.1016/j.triboint.2005.11.014 (DOI)000243576700003 ()2-s2.0-33845185783 (Scopus ID)
Note

QC 20100811

Available from: 2006-05-22 Created: 2006-05-22 Last updated: 2016-07-11Bibliographically approved
2. Simulation models of test equipment for measuring transient friction in a rolling and sliding contact
Open this publication in new window or tab >>Simulation models of test equipment for measuring transient friction in a rolling and sliding contact
2005 (English)In: Proceedings of OST ’05 Symposium On Machine Design, 2005Conference paper, Published paper (Refereed)
Abstract [en]

This paper investigates how a model for boundary lubricated rolling and sliding contacts can be integrated in a dynamic rigid body model of a mechanical system in order to improve the accuracy of simulations of system behavior. The system modeled is test equipment for the measurement of transient friction in rolling sliding contact between two discs. Two different models of the system were constructed: one neglecting the rolling and sliding contact and the other integrating it in the system model. In the integrated contact model, the pressure distribution was computed using an elastic foundation model. A brush model was used for the friction calculation. Simulations were performed with both models and validated by experiments. The results show that the contact needs to be included in the model in order to capture the behavior of the system. Since the contact model used can handle both microslip and gross slip, it is applicable to a wide range of contact conditions.

Keyword
simulation, rolling and sliding contact, friction
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-5772 (URN)
Conference
OST ’05 SYMPOSIUM ON MACHINE DESIGN, October 20-21, 2005 in Stockholm, Sweden
Note

QC 20101129

Available from: 2006-05-22 Created: 2006-05-22 Last updated: 2016-04-22Bibliographically approved
3. Modeling transient behavior of a mechanical system including a rolling and sliding contact
Open this publication in new window or tab >>Modeling transient behavior of a mechanical system including a rolling and sliding contact
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.

National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-5773 (URN)10.1115/IMECE2005-80906 (DOI)000243026700030 ()2-s2.0-33646679896 (Scopus ID)
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
4. Validation of a simple contact model and its applicability on rough surfaces
Open this publication in new window or tab >>Validation of a simple contact model and its applicability on rough surfaces
2006 (English)In: Proceedings of 12th Nordic Symposium on Tribology NORDTRIB 2006, 2006Conference paper, Published paper (Refereed)
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-5774 (URN)
Conference
12th Nordic Symposium on Tribology NORDTRIB 2006, Helsingör, Denmark, June 7-9, 2006
Note

QC 20101129

Available from: 2006-05-22 Created: 2006-05-22 Last updated: 2016-04-18Bibliographically approved

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