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Concept of hybrid system for computer aided of machines design process

Ociepka P., Gwiazda A.

Selected Engineering Problems

2013

nr 4

127--132

This paper presents a method, basing on the engineering knowledge and experience, for aiding the design process. In this method, the system is built using the hybrid architecture that combines the advisory system and the CBR method. In the paper the structure of the advisory system and the functioning of the CBR system have been described. Attention was drawn to the problem of an "empty database" in relation to systems basing on the CBR method. It was also discussed the area of engineering activities for which the proposed method is dedicated.

Validation of computer models of an artificial hip joint

Okrajni J., Plaza M., Ziemba S.

Archives of Materials Science and Engineering

2007

Vol. 28, nr 5

305-308

Purpose: Problems of the modelling of the surgical cement behaviour during implantation have been presented in the paper. The purpose was to validate the FEM model describing the temperature fields in the bone during the surgery treatment. Design/methodology/approach: The physical laboratory modelling has been used to perform validation of the model that makes it possible to predict the temperature influence on the bone tissue during polymerization process. Findings: Due to its non-invasive nature, the computer models' validation method applied in the study seems to be the right solution for the research on surgical procedures of endoprosthesis implantation. However, a particular emphasis should be placed on a correct selection of thermophysical properties of the designed laboratory models. Relying on the calculations and research results, similar local values of maximum temperatures were obtained. Practical implications: The computer modelling methods presented in the paper together with the analytical approach are of great importance to both forecasting the implants' behaviour during a surgical procedure and in their operational conditions, as well as in the selection and modification process of surgical cements' material properties. The analysis carried out makes it possible to determine the location of zones most threatened with an adverse effect of an elevated temperature. They are located in the vicinity of the top of the endoprosthesis stem. Originality/value: The work presents the own method of validation of the FEM model used for heat flow modelling.