Simulation based exploration of a loading strategy for a LHD-vehicle
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Simuleringsbaserad utforskning av styrstrategier för frontlastare (Swedish)
Optimizing the loading process of a front loader vehicle is a challenging task. The design space is large and depends on the design of the vehicle, the strategy of the loading process, the nature of the material to load etcetera. Finding an optimal loading strategy, with respect to production and damage on equipment would greatly improve the production and environmental impacts in mining and construction.
In this thesis, a method for exploring the design space of a loading strategy is presented. The loading strategy depends on four design variables that controls the shape of the trajectory relative to the shape of the pile. The responses investigated is the production, vehicle damage and work interruptions due to rock spill. Using multi-body dynamic simulations many different strategies can be tested with little cost. The result of these simulations are then used to build surrogate models of the original unknown function. The surrogate models are used to visualize and explore the design space and construct Pareto fronts for the competing responses.
The surrogate models were able to predict the production function from the simulations well. The damage and rock spill surrogate models was moderately good in predicting the simulations but still good enough to explore how the design variables affect the response. The produced Pareto fronts makes it easy for the decision maker to compare sets of design variables and choose an optimal design for the loading strategy.
Place, publisher, year, edition, pages
2016. , 61 p.
DEM NDEM surrogate models loading strategy granular material Pareto
IdentifiersURN: urn:nbn:se:umu:diva-126419OAI: oai:DiVA.org:umu-126419DiVA: diva2:1033068
Subject / course
Examensarbete i teknisk fysik
Master of Science Programme in Engineering Physics
2016-08-26, Umeå, 14:55 (Swedish)
Servin, Martin, Universitetslektor
Wadbro, Eddie, Universitetslektor