Abstract: A guidance system for three-dimensionally accurate projections of timber frame construction elements was developed. Employing augmented reality (AR) glasses, interactive assembly instructions are projected onto the work environment of a timber construction company and integrated into their operational workflow. The purpose of this was to restructure the conventional assembly process utilising paper plans into a semi-digital, temporally relevant and accelerated process. The necessary geometry data was readily available and could be exported by current timber construction-specific CAD systems. The component information and layering sequence were configured for the glasses using an AR toolkit. Compared to preceding systems, the developed solution applies a successive relevant temporal filter as well as a fitting algorithm that refers to several localisation markers. Specifically developed software facilitates the levelling of the projection plane, measuring functions as well as approval and monitoring functions of individual components. According to practical trial runs of the assembly process, it was found that the project significantly improved the positioning of the individual timbers, the fastening of the sheeting and the insulation panels, while also reducing the extent of accumulative errors. Further development also managed to include non-conventional, free-form geometries. Tests revealed that the developed solution did not require any extensive training and its application could be considered intuitive.
Authors: Felix SCHMIDT-KLEESPIES, Laurenz ANDRITZ, Cristoph DIJOUX, Alexander STAHR