Capturing of FePt nanoparticles in a stream of a liquid

This study considers capturing of FePt nanoparticle in a magnetic field when the particles are injected into a stream of flowing liquid. A roller pump is used to induce a flow of water at several flow rates to assess the growth of FePt aggregation near magnetic field source. The particles are injected into the system using a micro syringe pump at different flow rates. The aggregations are observed with a microscope. Subsequently some estimation is performed with respect to a magnetic hyperthermia, which is a part of a method for treating undesirable biological entities in blood vessels

Investigation of magneto-rheological fluid parameters using cantilever -type piezoactuator

There has been a growing interest in the on-line detection of viscosity of magnetorheological fluids since it is a critical parameter that is sensitive to material property changes caused by chemical reactions, sedimentation process and magnetic field. Online monitoring of viscosity and density offers a powerful means for controlling the quality of magneto-rheological fluids and processes involving fluid environment

Simulation of oscillation dynamics of vibroprotective system with the electrorheological shock-absorber

The paper presents development of a mathematical model of a three-mass oscillating vibroprotective system with electrorheological (ER) shock-absorber by taking into account influences of temperature and electric field. Performance characteristics of the ER shockabsorber are established including dependences of force on rod displacement for different absorber geometry, rheological properties of ER fluid and magnitudes of temperature and electric field. This research work also provides comparison of simulation results of ER vibroprotective system during its linear movement through road profile “the sleeping policeman” in time domain. Amplitude-frequency characteristics of the vibroprotective system with ER shock-absorber are determined as function of electric field strength and temperature

Evaluation of the resistance force of magnetorheological fluid damper

The aim of this research was to examine the resistance force generated by linear hydro-cylinder type magnetorheological fluid (MRF) damper acting in different regimes. MRF damper performance has been investigated experimentally by using universal computerized material properties testing machine. Measurements of resistance force have been carried out for different speeds of the damper piston motion under different strength of the magnetic field. Dependences of the force on these parameters (speed and magnetic field strength) have been obtained. It was defined, that the force increases practically linearly when increasing strength of the magnetic field and when increasing piston speed

Research of the flexible bellow with the magnetorheological fluid

MR fluids are widely used in various structures such as controlled dampers, brakes, clutches, etc. Application of these fluids can reduce energy costs and weight as well as increase device operational speed and lifetime. In order to exploit all the qualities of MRS and ERS properties it is necessary to occasionally mix the fluids and monitor them. These systems are still under research and development in laboratories worldwide. This article describes the developed and tested flexible bellow, which can determine whether the MR fluid is under influence of sedimentation and whether it can operate correctly or it is necessary to perform the mixin

R&D of the device for blind to conceive 2D graphical information

Miniature piezoelectric thimble is described and investigated, based on friction control between PC screen and thimble’s contacting surface. The contours of the image on PC screen switch on and off harmonic or non-harmonic electric signals, connected to the electrodes of bimorph piezoelectric transducer, generating bending deformations, affecting friction coefficient. While scanning the PC screen in two directions, these periodic variations of friction coefficient result in oscillations of the fingertip, related to the color or intensity of the image components on the screen. Another three cases of pin’s oscillations normal to finger contacting surface are described

Research of the flexible bellow with the magnetorheological fluid

MR fluids are widely used in various structures such as controlled dampers, brakes, clutches, etc. Application of these fluids can reduce energy costs and weight as well as increase device operational speed and lifetime. In order to exploit all the qualities of MRS and ERS properties it is necessary to occasionally mix the fluids and monitor them. These systems are still under research and development in laboratories worldwide. This article describes the developed and tested flexible bellow, which can determine whether the MR fluid is under influence of sedimentation and whether it can operate correctly or it is necessary to perform the mixin

Control of piezoelectric scanner dynamics using magnetorheological fluid

The developed one-dimensional laser beam scanner, driven by a piezoelectric disctype unimorph actuator is presented in this paper. The dynamics of a piezoelectric actuator is analyzed. A magnetorheological fluid (MRF) damper is used to eliminate transient vibrations of the scanner eigen frequencies induced by the stepped driving voltage. Experimental results demonstrate the effectiveness of the MRF damper in residual-vibration reduction in the laser beam scanner

Research of the flexible bellow with the magnetorheological fluid

MR fluids are widely used in various structures such as controlled dampers, brakes, clutches, etc. Application of these fluids can reduce energy costs and weight as well as increase device operational speed and lifetime. In order to exploit all the qualities of MRS and ERS properties it is necessary to occasionally mix the fluids and monitor them. These systems are still under research and development in laboratories worldwide. This article describes the developed and tested flexible bellow, which can determine whether the MR fluid is under influence of sedimentation and whether it can operate correctly or it is necessary to perform the mixin

R&D of the device for blind to conceive 2D graphical information

Miniature piezoelectric thimble is described and investigated, based on friction control between PC screen and thimble’s contacting surface. The contours of the image on PC screen switch on and off harmonic or non-harmonic electric signals, connected to the electrodes of bimorph piezoelectric transducer, generating bending deformations, affecting friction coefficient. While scanning the PC screen in two directions, these periodic variations of friction coefficient result in oscillations of the fingertip, related to the color or intensity of the image components on the screen. Another three cases of pin’s oscillations normal to finger contacting surface are described