Design Optimization of a Boom for Drill Rigs

Ida Haglund, Anna Håkansson (School of Engineering Jönköping)

This thesis describes how a design optimization of a boom structure for drill rigs can be set up and performed where the range is increased and the weight reduced. A program that calculates the coverage area based on the boom angles and dimensions is connected with a finite element analysis of a boom model that is auto-generated by a macro, using commercial optimization software. The macro was recorded while creating the model and dimensions have been replaced by varying parameters. Workflows are created in the optimization software where suitable design of experiments and optimization algorithms are selected.

The optimization software modeFRONTIER was used to connect the area calculation and FEA-model and to perform the optimizations. Two single-objective and one multi-objective workflow were created. The first workflow maximized the coverage area and the resulting dimensions were used as constants in the second workflow where the weight was minimized by reducing the cross-section of the boom body. In the multi-objective optimization, the coverage area was maximized and the weight minimized in the same workflow. Suitable design of experiments and optimization algorithms for each optimization were selected in modeFRONTIER. By running the optimizations, it was identified that the coverage area could be increased while the weight was reduced, with allowed stresses and deflections. By using optimization to a defined problem, a solution can be found that fulfills the given requirements and maximizes or minimizes the outcome.