Application of piezoactive material/rheological fluid composite structures in engineering

Active materials are rapidly expanding their variety as well as applications due to their promising high–tech potential. Composite structures of active materials enable researchers to develop mechatronic systems and devices with inherent intelligence features and increased level of integration. A composite structure consisting of piezoactive material and electrorheological fluid is proposed, and its possibilities in developing self-adjusting and adaptive systems are discusse

Research of dynamic characteristics of piezoelectric actuator used in flow control device

Novel flow control device, which functionality is based on piezoelectrical actuator and special membrane is proposed in this paper. The membrane is composed from two gratings. Rotating one of the control membrane plates with micro pores generates effects that are exploited for control of flow. Traveling wave piezoelectric actuator of rotary type is studied experimentally in this paper

Formation of structural matrices for finite elements of piezoceramic structures

This paper deals with the description of a theoretical background of systematic computer algebra methods for the formation of structural matrices of piezoceramic finite elements. Piezoceramic actuators are widely used for high-precision mechanical systems such as positioning devices, manipulating systems, control equipment, etc. In this paper, the efficiency of computer algebra application was compared with the numerical integration methods of formation of the structural matrices of the finite elements. Two popular finite elements are discussed for modeling piezoceramic actuators: sector type and the triangular one. All structural matrices of the elements were derived using the computer algebra technique with the following automatic program code generation. Due to smaller floating point operations, the computer time economy is followed by an increased accuracy of computations, which is the most important gain achieved in many cases

Information entropy determination in scales measurement including mechatronic approach

"Analysis of information entropy of mechatronic measuring systems, computer modelling; research of the accuracy of multiparameter systems and the solutions for determination of the deviations of those parameters for the purpose of application it to the adaptive correction and for assurance of mechatronic control of the system are presented in the paper. The mechatronic means for correction of systematic errors of information-measuring systems including measurement of linear and circular scales are presented. An application of active materials for smart correction by piezoactuators is given

Development of laser beam light intensity control system

The paper proposes a novel laser beam light intensity control system, which functionality is based on piezoelectric actuators and special membrane that is comprised from two gratings. Geometrical adjustment between adjacent pores in both plates results in zero light intensity through the membrane when no control signal is activated. Displacement of one of the control membrane plates with micro pores generates effects which are exploited for laser beam flow power control

Development of smart membrane valve based on geometric moiré interferometry

Novel smart membrane valve which functionality is based on optical interference effects caused by moiré interferometry is proposed in this paper. The membrane is comprised from two steel gratings. Geometrical adjustment between adjacent holes in both membranes results in zero flow rate through the valve when no control signal is activated. Rotation of the control membrane generates moiré interference effects which are exploited for flow control. Relationships between the shape and geometric locations of the moiré circles and the control parameters of the second membrane are determined what helps to implement optimal valve control strategie

Slow steady-state flow of viscous fluid near vibrating cylinders; analytical solution for symmetric channel

Oscillating cylindrical body in a viscous fluid initiates oscillating and not oscillating, slow steady-state creeping, flows. Solution of the creeping flow can be deduced if flow of the ideal fluid is determined. In this paper plane steady-state flow of the ideal fluid past a circular cylinder, placed symmetrically in a channel, is found. The theory of analytical functions and conformal mapping are applie

Trajectory planning method of rotating mobile piezorobot

This paper presents method of trajectory planning of mobile piezorobots. An algorithm is introduced to evaluate motional trajectory for this kind of robots that describe point-to-point motion by given function. Preliminary experimental results prove the feasibility of proposed mathematical mode

Investigation of dynamic of smart valve using holographic PRISM system

The purpose of this work is to find dynamic characteristics of a new smart valve with piezoactuator used in different mechatronic systems, in medicine, alimentary industry, etc. Novelty of this valve is that one of the parts of its control device, i.e. membrane, is comprised of two raster steel disks (each disc has the same number of notches) and the flow is controlled by means of optical interference effect generated between them. With the help of holographic PRISM system we investigated which piezocylinder, segmented or nonsegmented, is better to use in the system of smart valve. Also we represented the original patented scheme of the smart valv

Analysis of mini submarine control based on moiré interferometry

The purpose of this work is to create a new remotely controlled mini submarine used in robotics or in toy industry. To prepare the numerical and mathematical models for identification of the most optimum ratio alfa1/alfa2 of raster discs, number of raster notches, and a required angle of one disc turn beta, for changing the flow direction and, simultaneously, the sailing direction of the mini submarin