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A deformable terrain model in multi-domain dynamics using elastoplastic constraints: An adaptive approach
Umeå University, Faculty of Science and Technology, Department of Physics.
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Modellering av deformerbar terräng med elastoplastiska bivillkor i flerkroppsdynamik: Ett adaptivt tillvägagångssätt (Swedish)
Abstract [en]

Achieving realistic simulations of terrain vehicles in their work environment does not only require a careful model of the vehicle itself but the vehicle's interactions with the surroundings are equally important. For off-road ground vehicles the terrain will heavily affect the behaviour of the vehicle and thus puts great demands on the terrain model.

The purpose of this project has been to develop and evaluate a deformable terrain model, meant to be used in real-time simulations with multi-body dynamics. The proposed approach is a modification of an existing elastoplastic model based on linear elasticity theory and a capped Drucker-Prager model, using it in an adaptive way. The original model can be seen as a system of rigid bodies connected by elastoplastic constraints, representing the terrain. This project investigates if it is possible to create dynamic bodies just when it is absolutely necessary, and store information about possible deformations in a grid.

Two methods used for transferring information between the dynamic bodies and the grid have been evaluated; an interpolating approach and a discrete approach. The test results indicate that the interpolating approach is preferable, with better stability to an equal performance cost. However, stability problems still exist that have to be solved if the model should be useful in a commercial product.

Place, publisher, year, edition, pages
2015. , 55 p.
Keyword [en]
deformable terrain model, real-time simulations
National Category
Computational Mathematics Other Physics Topics
URN: urn:nbn:se:umu:diva-108328OAI: diva2:852371
External cooperation
Algoryx Simulation AB
Subject / course
Examensarbete i teknisk fysik
Educational program
Master of Science Programme in Engineering Physics
2015-08-28, Universitetsklubben, Umeå universitet, Umeå, 20:49 (Swedish)
Available from: 2015-09-09 Created: 2015-09-08 Last updated: 2015-09-09Bibliographically approved

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