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Examining the simulation-to-reality gap of a wheel loader digging in deformable terrain
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik. Komatsu Ltd., Tokyo, Japan. (Digital Physics)ORCID-id: 0009-0000-7928-3944
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik. Algoryx Simulation AB, Umeå, Sweden. (Digital Physics)ORCID-id: 0000-0002-0787-4988
2025 (Engelska)Ingår i: Multibody system dynamics, ISSN 1384-5640, E-ISSN 1573-272X, Vol. 64, s. 121-148Artikel i tidskrift (Refereegranskat) Published
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%.

Ort, förlag, år, upplaga, sidor
Springer Nature, 2025. Vol. 64, s. 121-148
Nyckelord [en]
Earth-moving simulation, Multiscale, Real-time simulation, Soil dynamics, Validation, Vehicle dynamics
Nationell ämneskategori
Robotik och automation Teknisk mekanik Annan fysik
Forskningsämne
fysik; reglerteknik; data- och systemvetenskap
Identifikatorer
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
Tillgänglig från: 2024-07-20 Skapad: 2024-07-20 Senast uppdaterad: 2025-07-11Bibliografiskt granskad
Ingår i avhandling
1. High-performance autonomous wheel loading: a computational approach
Öppna denna publikation i ny flik eller fönster >>High-performance autonomous wheel loading: a computational approach
2025 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Alternativ titel[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.

Ort, förlag, år, upplaga, sidor
Umeå: Umeå University, 2025. s. 31
Nyckelord
Earthmoving, Automation, Wheel loader, Bucket-filling, Multibody and soil dynamics, Realtime simulation, Sim-to-real gap, World modeling, Deep learning, Optimization
Nationell ämneskategori
Datavetenskap (datalogi)
Forskningsämne
datalogi
Identifikatorer
urn:nbn:se:umu:diva-233090 (URN)978-91-8070-567-7 (ISBN)978-91-8070-568-4 (ISBN)
Disputation
2025-01-24, MIT.A.121, Umeå, 09:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2025-01-07 Skapad: 2024-12-20 Senast uppdaterad: 2025-01-07Bibliografiskt granskad

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Aoshima, KojiServin, Martin

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