Development of vibrating bracelet for the actuation of the blood circulation at capillaries

According to Katsuzo Nishi proposed capillarity exercise based on limbs vibrations the equipment to compensate obstruction of blood circulation is proposed. This equipment is composed from the vibrating bracelet for disable people and simplify exercise execution for healthy people as well. A need to create small size and low voltage device was identified. Previous studies have showed that it is recommended to avoid high frequencies because of possible harm for human. According to this requirements two high RPM, small size and low voltage motors were chosen. The rotors unbalances are working in beating regime, which increases the excentrical forces actuating human limbs. After processing gathered data proper frequencies for vibrating bracelet were chosen

Piezoelectric actuator for micro robot used in nanosatellite

The nanosatellites of the CubeSat standard (10×10×10 cm and with mass 1-10 kg) was designed to reduce cost and development time and to maximize science return. However, the small size of the spacecraft imposes substantial mass, volume, and power constraints. The challenge remains to be the miniaturization of the various robots for the manipulation of functional objects, such as cameras, laser sources, mirrors and other used in nanosatellites. Therefore in particular, precision positioning of the manipulated object is important task for robots used in nanosatellites as well. In this paper authors present the design of robot driven by the piezoelectric actuators. Investigations of the robot are presented and they prove ability to improve the accuracy of the movement for the robot arm using two bending bimorph type piezoelectric actuators and 3DOF rotary piezoelectric motor

Investigation of tactile characteristics of the piezoelectric bimorph type actuators

Simple and effective new type of tactile device is presented and investigated, which transfers 2D graphic information to the visually impaired people. It consists of piezoelectric bimorph cantilever, acting as an oscillating probe, and, when changing operational signal, could transfer information to visually impaired people, e.g. by crossing the lines/contours on the screen of tablet PC or determining the color of them. Determining the amplitude of tip’s oscillation, attached to bimorph PZT cantilever and contacting with finger, is presented. It is established that tactile device’s body and integrated bimorph cantilever oscillations and their effect on the human finger are different. The visually impaired people better percept the oscillations of Braille pins, which are attached to cantilever tip; maximum perception of tip’s oscillations are achieved, when bimorph tip generates approximately 0.5 N force

Miniature rotary tables with piezoelectric hemispheres: research and development

The aim of this research is to develop and investigate two modifications of high resolution miniature rotary tables, based on the transformation of 3D resonant oscillations of hemisphere actuators into continuous or start-stop motion of contacting rotary table. To generate 3D resonant oscillations of the contacting points, the electrodes of the actuators are sectioned into several parts, enabling the generation of traveling wave type higher forms of oscillations. The results of modeling of hemisphere actuators are presented together with experimental investigation of resolution and response time. It is shown that axial oscillations of the table and its torsional oscillations can be generated, extending the functionality of the devices

Development of two modifications of piezoelectric high resolution rotary table

The aim of this paper is to describe two modifications of high resolution rotary tables with angular position control, based on the transformation of resonant oscillations of piezoelectric transducers into continuous or start-stop motion. Exact angular position of the table is achieved by application of integrated classical rotary position encoders and feedback system, related to the given position or angular velocity of the device. Dimensions and cost of the table should be dramatically reduced, thus ensuring competitiveness in modern markets

Design and dynamic modeling of piezoelectric laser beam shutters

The paper presents the results of numerical modelling and experiments of piezoelectric bimorph-type bending actuator for laser beam shutting system. Theoretical calculations are realized by using finite element method. The purpose of these calculations is to optimize geometric parameters of a piezoelectric bimorph, ensuring maximum resonant frequency of the first bending form and stability of oscillation amplitude. Experimental performance of piezoelectric actuators is compared with results of finite element simulations

R&D of high resolution rotary table based on the ultrasonic standing waves

This paper covers the essential information associated with recently developed piezoelectric rotary drive being able to act as the basis for most of forthcoming relevant devices. The aim of the work is to investigate such a novel table the operation of which relies on transformation of resonant ultrasonic standing wave oscillations into continuous or start-stop motion. Angular position of the device is registered by means of integrated optical encoder-type subsystem. A significant attention is paid to the structure, numerical analysis and dynamic characteristics of the drive

Investigation of novel design piezoelectric bending actuators

Two piezoelectric bending actuators of a novel design are presented and analysed in the paper. Numerical modelling and experimental study of the piezoelectric bending actuators were performed to verify operating principle and to investigate dynamic characteristics of the actuators. Numerical calculations are performed by using finite element method. Results of experimental study of piezoelectric actuators are compared with the results of finite element simulations. Results of the numerical and experimental research are analysed and discussed

Investigation of tactile characteristics of the piezoelectric bimorph type actuators

Simple and effective new type of tactile device is presented and investigated, which transfers 2D graphic information to the visually impaired people. It consists of piezoelectric bimorph cantilever, acting as an oscillating probe, and, when changing operational signal, could transfer information to visually impaired people, e.g. by crossing the lines/contours on the screen of tablet PC or determining the color of them. Determining the amplitude of tip’s oscillation, attached to bimorph PZT cantilever and contacting with finger, is presented. It is established that tactile device’s body and integrated bimorph cantilever oscillations and their effect on the human finger are different. The visually impaired people better percept the oscillations of Braille pins, which are attached to cantilever tip; maximum perception of tip’s oscillations are achieved, when bimorph tip generates approximately 0.5 N force

Design and dynamic modeling of piezoelectric laser beam shutters

The paper presents the results of numerical modelling and experiments of piezoelectric bimorph-type bending actuator for laser beam shutting system. Theoretical calculations are realized by using finite element method. The purpose of these calculations is to optimize geometric parameters of a piezoelectric bimorph, ensuring maximum resonant frequency of the first bending form and stability of oscillation amplitude. Experimental performance of piezoelectric actuators is compared with results of finite element simulations