De Martino, Massimiliano (2020) A Multi-Attribute Task Sequencing Optimization with Neighbourhoods Method to Improve Quality in Sustainable Industrial Processes. [Tesi di dottorato]

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Industrial world faces what is commonly recognized as fourth industrial revolution, also known as ‘Industry 4.0’.Industry 4.0 requires an overall production process optimization which deals with many manufacturing industrial aspects. Consider all sources of industrial optimization is not a trivial task. This dissertation deals with some of them which have a huge impact on Industry 4.0 fundamental, which are: • Robot Path Planning Optimization • Defects Impacts Reduction • Workers’ condition improvement Compared to great efforts made in the last years, a strategy for a production with no defects has not been completely inside industries companies, so quality process must rectify defects to avoid waste of resources. Quality process is realized by human resources manually leading to waste of human resources and significant ergonomics risk factors as awkward posture in handling job task; moreover although people are very good at this task and sometimes even better than machines, they cannot work for long periods of time as their eyes get tired, muscles and tendon could be overloaded, compromising operator’s health and quality of the work. Automate the quality control process will bring undoubted advantages in various aspects, as the improvement of the ergonomics workplace, optimization of the process as regards processing times, and quality of the production output. The dissertation addresses the following questions: How to define a new kind of workstation which can be applied to a wide range of industrial application to achieve: • Improvement in ergonomic workspace aspects • Reduction in defects number and impact Optimization in robot task execution by means of a methodology minimising computational time to enable dynamic robot programming in the case of multiple and coupled tasks’ attributes Starting from this question, following contributes have been addressed: 1. How to find optimal task sequence in case of not simple shapes with partial or total overlap using Euclidean distance as key metric a. Define an operator able to define when to pass through overlap zones 2. How to define an attribute to evaluate and forecast collision between robot and human, considering all robot parts, starting from multi-attribute approach to find optimized task sequencing 3. How to use computer-based method to develop a tool for image recognition on a reflecting surface.

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