Model-based a priori analysis of line-less mobile assembly systems; 1 [book]

Guido Hüttemann, Robert H. Schmitt, Gisela Lanza
The continuing trend towards producing individualised products leads to process time fluctuations, different process sequences and continuous integration planning in industrial assembly. Furthermore, in the assembly of large and complex components, there is a desire to increase automation for quality and cost reasons. This is often not economically feasible within the framework of conventional, line-based assembly systems with fixed installations. It requires an increase in the changeability of
more » ... assembly systems. Within this thesis, a new form of organisation for industrial assembly and a method for a priori performance evaluation is developed. Based on a comparison of requirements for changeable production systems with existing changeability paradigms in manufacturing and assembly, Line-less Mobile Assembly Systems (LMAS) are defined. Three core principles characterise LMAS: (1) clean floor approach, (2) mobilisation of all assembly relevant assets, and (3) the highly flexible assignment of resources to jobs and jobs to locations considering process requirements. LMAS are characterised by job routes describing a tuple of resource allocation, order of assembly processes, time sequence, and spatial allocation on the shop floor for all steps necessary for assembly within sequence restrictions. The mastery of complex systems requires a comprehensive model-based understanding. A reference architecture model is developed for the design, evaluation, and control of LMAS. The model provides additional usage levels and a hierarchy for the model's assets through abstract modelling. Based on this reference architecture model, a mathematical formalisation of an LMAS is provided. During rough planning of a new assembly system, the possibility of a low-effort assessment based on typical production key figures such as throughput, lead time, and resource utilisation is required. A method is presented, which transfers an LMAS into a closed queueing network and determines production-relevant key figures using an analytical solution [...]
doi:10.18154/rwth-2021-02011 fatcat:yuqf6s4bcneljjybvgrrsvqlhm