The most modern generation of controlled AK prostheses is considered as important step forward in technology of manufacture of AK prostheses, since they offer the highest proximity to human walk. However, so far the problem of climbing the stairs by transfemoral amputee has not been resolved. The reason for unresolved problem of upstairs movement of persons with AK prosthesis lies in a need to introduce an external source of energy, which would provide the user with energy required for lifting a body when climbing the stairs. The kinematic analysis of movement of the AK prosthesis with a build-in hydraulic cylinder connected to an external source of power is intended to prove that there is a real possibility for a person with an AK prosthesis to climb stairs. An analysis was carried out of the prosthesis movement in a sagital plane for the period of climbing from the first contact of the artificial foot with the step of a stair until the moment of its separation. Trajectories of characteristic points on the prosthesis were recorded for the examinee climbing three staircases with different gradients: shallow SH (25º), moderate M (30º) and steep ST (36º). The reaction force on stair during the movement of an AK prosthesis is analyzed. For more detailed analysis of climbing of a transfemoral amputee, an analysis of reaction force of stair for healthy persons has been carried out. The ELITE system with two CCD cameras and a Kistler platform for measuring the force on the surface were used during measurements.

This paper describes the analysis of steel reel shaft as drive shaft in a process of umbilical spooling of wire rope. There is a need to investigate shaft behaviour in the conditions of increasing workload. The aim is to investigate avoiding possible redesign or enabling redesign with minimal costs. Stress analysis has been carried out by using finite element analysis (FEA) and results are compared with the analytically calculated values. Finite element analysis has been carried out using maximum stress criteria and the area of potential failure is found. The main objective of this paper is to find balance in results between "design by rule" and "design by analysis". Design by rule provides rules on how to design a steel reel shaft using analytical equations and other strict rules from design elements. Design by analysis provides rules on using numerical analysis, typically finite element analysis to design a steel reel shaft. The steel reel shaft has been geometrically modelled using SolidWorks. To check all stresses, linear static analysis is done using DSS Simulation and Ansys.

No abstract

No abstract

Lifting table has been designed and developed through the concept of Learning Factory (LF) at the University of Mostar. The idea for lifting table design has come from the local industry needs for a lifting platform that should lift a man and/or load at a certain height. For safety reasons, design is checked under the loading using a method of finite element analysis. The paper predicts and explains methodology for structural analysis used in presented case study. Results of FEM analysis are basis for making ways and guidelines to optimize current design in order to get optimal parameters for weight, stability, capacity, mobility and layout of the lifting table.