The purpose of this study is to design and correlate, from theoretical aspects, a mathematical model for virtual prototyping of an actuation system from an exoskeleton human ankle joint. This model is a part of the virtual and experimental prototype from a mechatronic system for locomotion rehabilitation in case of disabled persons. Experimental tests were performed on a group of persons without locomotion deficiencies in order to obtain the pattern curve for cam mechanism design and also to validate the proposed prototype. The obtained database was also used to develop geometrical kinematic synthesis of the exoskeleton actuation mechanisms for other joints such as hip and knee.

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In this paper is presented a few models of a robotic snake like unit which can be used in Minimally Invasive Surgery (MIS). In particular, this paper focuses on the flexible unit details. It’s rigid links can be fabricated using selective materials that are light-weight and slim. Thus, this flexible unit can be inserted through one small cavity. Finally, we show that the selected flexible unit may be a very good alternative for Single Port Access (SPA) surgery or this can be used in other environments as well.

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The paper aims to present some studies on the influence of mechanical braking systems with shoes on separately excited DC motors, intended to change the regime speeds. The researches were carried out by braking a 5 W DC motor with a maximum speed of 700 rpm, intended for special drives, with the help of a polyamide half-shoe brake, when measuring the variation of some process parameters: speed of the motor under the braking conditions, the temperature inside the shoe and the electrical parameters of the motor - voltage, current, power and energy consumed.