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Examining the simulation-to-reality gap of a wheel loader digging in deformable terrain
Umeå University, Faculty of Science and Technology, Department of Physics. Komatsu Ltd., Tokyo, Japan. (Digital Physics)ORCID iD: 0009-0000-7928-3944
Umeå University, Faculty of Science and Technology, Department of Physics. Algoryx Simulation AB, Umeå, Sweden. (Digital Physics)ORCID iD: 0000-0002-0787-4988
2024 (English)In: Multibody system dynamics, ISSN 1384-5640, E-ISSN 1573-272XArticle in journal (Refereed) Epub ahead of print
Abstract [en]

We investigate how well a physics-based simulator can replicate a real wheel loader performing bucket filling in a pile of soil. The comparison is made using field-test time series of the vehicle motion and actuation forces, loaded mass, and total work. The vehicle was modeled as a rigid multibody system with frictional contacts, driveline, and linear actuators. For the soil, we tested discrete-element models of different resolutions, with and without multiscale acceleration. The spatiotemporal resolution ranged between 50–400 mm and 2–500 ms, and the computational speed was between 1/10,000 to 5 times faster than real time. The simulation-to-reality gap was found to be around 10% and exhibited a weak dependence on the level of fidelity, e.g., compatible with real-time simulation. Furthermore, the sensitivity of an optimized force-feedback controller under transfer between different simulation domains was investigated. The domain bias was observed to cause a performance reduction of 5% despite the domain gap being about 15%.

Place, publisher, year, edition, pages
Springer Nature, 2024.
Keywords [en]
Earth-moving simulation, Multiscale, Real-time simulation, Soil dynamics, Validation, Vehicle dynamics
National Category
Robotics and automation Applied Mechanics Other Physics Topics
Research subject
Physics; Automatic Control; computer and systems sciences
Identifiers
URN: urn:nbn:se:umu:diva-227951DOI: 10.1007/s11044-024-10005-5ISI: 001272281300002Scopus ID: 2-s2.0-85198934485OAI: oai:DiVA.org:umu-227951DiVA, id: diva2:1885034
Available from: 2024-07-20 Created: 2024-07-20 Last updated: 2025-02-05
In thesis
1. High-performance autonomous wheel loading: a computational approach
Open this publication in new window or tab >>High-performance autonomous wheel loading: a computational approach
2025 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Högpresterande autonom hjullastning : en beräkningsmetod
Abstract [en]

Smart and autonomous earthmoving equipment enhances energy efficiency,productivity, and safety at construction sites and mines. The innovations provide means to reach high-set sustainability goals and be profitable despite increasing labor shortages. In addition, recent technological breakthroughs in artificial intelligence highlight the potential of superhuman capabilities to further enhance operations. This thesis presents a computational approach to end-to-end optimization of autonomous wheel loaders operating in a dynamic environment. Wheel loaders are mainly used for repeatedly loading material and carrying it to load receivers in quarries and mines. The difficulty lies in that each loading action alters the state of the material pile. The resulting state affects the possible outcomes of the subsequent loading process and, ultimately, the total performance. Thus, the challenge is to achieve both autonomous and high-performance wheel loading over a sequence of tasks. Achieving this requires the ability to predict future outcomes and account for the cumulative effect of loading actions. The thesis constructs a real-time wheel loader simulator, develops world models for sequential loading actions with evolving pile states, formulates the end-to-end optimization problem, and introduces a look-ahead tree search method to solve the problem. These contributions provide insights into utilizing physics-based simulation in combination with machine learning to further improve sustainability in mining and construction.

Place, publisher, year, edition, pages
Umeå: Umeå University, 2025. p. 31
Keywords
Earthmoving, Automation, Wheel loader, Bucket-filling, Multibody and soil dynamics, Realtime simulation, Sim-to-real gap, World modeling, Deep learning, Optimization
National Category
Computer Sciences
Research subject
Computer Science
Identifiers
urn:nbn:se:umu:diva-233090 (URN)978-91-8070-567-7 (ISBN)978-91-8070-568-4 (ISBN)
Public defence
2025-01-24, MIT.A.121, Umeå, 09:00 (English)
Opponent
Supervisors
Available from: 2025-01-07 Created: 2024-12-20 Last updated: 2025-01-07Bibliographically approved

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Aoshima, KojiServin, Martin

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