Mirko Karakašić

Matrix of function and functionality as a tool in product development process

Original scientific paper The paper describes the use of MFF (Matrix of function and functionality) as a tool in product development process. After years of analysis of matrix methods, functions and functionalities of the products, we have developed a matrix tool that is designed for a wide range of engineers to help developing of new products or their parts. The paper presents the core of the MFF, that is the mathematical model and the computer application. Basic idea was to create an innovative knowledge base in a specific area that contains at one place the knowledge of engineers acquired during their working life, or during product development. With MFF it is possible to generate completely new products with new functional structures where functions are unambiguously described by physical sizes – influencing the functions.

Theoretical and experimental analysis of mine elevator dynamic characteristics

The paper presents the issues with the dynamic analysis of mine elevators used with underground exploitation of raw materials. Dynamic occurrences are particularly emphasized with those elevators due to the fact that they are facilities with extreme heights (up to 2000 m) and lifting speeds (up to 20 m/s) using the steel ropes. It shows the forming path of a competent dynamic model for the analysis of such elevators. Basic parameters (stiffness and damping) are of changeable magnitude during the lifting, so their values are defined through a combination of theoretical analysis and performed experiments at RTB mine elevators at the town of Bor (Serbia).