Papers by Author: Ion Lungu

Abstract: In this paper we present a new compact and portable rehabilitation system. It's role is to provide therapeutic passive motions of the hand. The anatomical characteristics and the biomechanics of the wrist are emphasized. The target anatomical movements of the hand are flexion-extension and abduction-adduction. A comparative study of similar devices is presented. The principle of operation of chosen variant is given. Its design methodology is detailed. A functional prototype was developed and its functional parameters are presented.

Abstract: This paper presents the development of an Assistive Technology representative product: an automatic page turner system, designed for persons with issues like multiple sclerosis, Parkinson’s disease and other various disabilities that involve the motor functions of the upper limbs. Firstly, the authors emphasize specific features of Assistive Technology and analyse the most important functional aspects concerning different types of page turner devices. The proposed page turner system is based on a four-bar mechanism. Design aspects from the constructive and functional points of view are exposed and the developed prototype is described.

Abstract: The compliant mechanisms are mechanical devices which provide smooth and controlled motion guidance due to the deformation of some or all of the components. In this paper an original compliant minigripper is designed and analyzed. An experimental prototype of the compliant minigripper was developed. It is characterized by a compact design and easy connection to the piezoelectric actuator that amplifies the input displacement.

Abstract: The actuators based on shape memory alloys are described in the paper. It is shown that there is necessity to develop the actuators of compact design with amplified force. Research results of such actuators are presented.

Abstract: The first part of the paper treats the general problems concerning the shape memory alloy actuators and their operation principle. Then, our work referring to the developing a modular family of linear and rotational actuators, realized in many typo dimensions, in a compact design, with facile connection with the actuated mechanisms and supplying module is presented. The active elements of these actuators are shape memory alloy wires, ribbons and helical springs. The influence of the geometry of the active elements on the time response is studied. The most important solutions to reduce the resistive heating time of active elements and to improve the time response on cooling are identified.