Papers by Author: Dan Mândru

Abstract: In this paper is presented a mini-system with compliant minigripper and piezoelectric actuation. The piezoelectric actuator is controlled with ramp and sinus signals. The response of the mini-system is predicted by the finite elements method. The displacement of the compliant mini-gripper and piezoactuator are analyzed. In the end is presented a comparison of the experimental results for same actuator but for two different types of the signals with theoretical results.

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: In this paper the authors present three wheeled-type in-pipe modular robotic systems, which are characterized by their adaptable structure based on linkage mechanisms. These modular systems are composed of driving modules (which use mechanisms with articulated elements) and passive modules.

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.

Abstract: In this paper, we proposed two wheeled-type in-pipe modular robotic systems. These modular systems are composed of driving modules (which use mechanisms with articulated elements) and passive modules. The first module (driving module) generates the traction force. The passive module is necessary to carry the control electronic equipment and for the transport of the needed equipment for realization of the in-pipe inspection. The joint disposed (universal join) by the two modules of the robot offers the capacity of orientation of this one.

Abstract: In the first part, the paper presents objectives of education in the biosystem engineering field, generally, and in the field of biomechatronics, especially. A hybrid system of Engineering and Biosystem is developed. Based on this, interrelations between components of engineering and biological systems are developed. In the second part, our experience during the past three years in introducing students to Biomechatronic engineering is described. The paper presents the specific team – work project elements and some examples of typical projects.