During the process of defining suitable design solutions, a designer has to consider a wide range of influential factors. Ergonomics certainly belongs to more complex ones. Less experienced designers could encounter several problems during this design stage. Although some literature can be found about ergonomic design of hand tools, a designer still has to have amassed quite a lot of experience and knowledge in the field of ergonomic, in order to choose and carry out appropriate design and redesign actions. Existing computer tools for ergonomic design are not able to assist a designer with higher level advice within design process. An intelligent decision support system has been developed in order to overcome this bottleneck. This paper presents a knowledge base, containing ergonomic design knowledge specific for hand tools design. A pneumatic hammer handle design is used as a case study to show how ergonomic design knowledge built in the system is used to improve the ergonomic value of the product.
Layered manufacturing technology allows rapid production of parts, which can be used for various engineering evaluation and analyses. For that reason, there is a need for developing an expert tool to fully implemented analyses of a CAD model at the some phases of design process. This paper introduces multi criteria decision based on intelligent advisory system. Knowledge base contains collected experts recommendations from functional, aesthetic and ergonomic field. These recommendations are improving model characteristics for its better exploitation. The ultimate goal of this expert tool is to provide the highest level of advice, depending on the limitations, such as surface quality, time production, manufacturing, assembling, or geometrical complexity. This model system should be applicable for the most CAD models. A case study with the electrical switch is carried out in order to show usefulness of application for specific problems in the layered manufacturing process in order to get better final part. The results obtained from a case study are implemented through 3D Print Technology.
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