Application of Magneto-Rheological Fluid based clutches for improved performance in haptic interfaces

2014 ◽  
Author(s):  
Nima Najmaei ◽  
Peyman Yadmellat ◽  
Mehrdad R. Kermani ◽  
Rajni V. Patel
Keyword(s):  
Haptic Interfaces ◽  
Improved Performance ◽  
Magneto Rheological

A Novel Rotary Magneto-Rheological Damper for Haptic Interfaces

2015 ◽  
Author(s):  
Okan Topcu ◽  
Yigit Tascioglu ◽  
Erhan Ilhan Konukseven
Keyword(s):  
Mr Damper ◽  
Shear Mode ◽  
Haptic Interfaces ◽  
Rotary Valve ◽  
Low Friction ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Fluid Dampers ◽  
Magneto Rheological ◽  
Femm Software

Haptic interfaces require lightweight, small actuators with high force capability and low friction. In this paper, based on the structure of conventional shear mode disc and drum type MR fluid dampers, a lightweight continuous rotary MR damper working in valve mode is designed for haptic interfaces. The proposed design is compared to shear mode disc-type and drum-type designs with similar torque–to–mass ratio via computer simulations. Mathematical models for the resistant torques of both the shear mode and the valve mode are derived. Subsequently, the finite element analysis of electromagnetic circuit calculations was carried out by FEMM software to perform an optimization of the dimensions of the parts such as gap size and thickness. It is shown that the proposed continuous rotary valve mode MR damper is a fine candidate that meets the requirements of haptic interfaces.

Design of a Cost Effective Haptic Interface

2010 ◽  
Author(s):  
Giovanni Bracco ◽  
Ermanno Giorcelli ◽  
Giuliana Mattiazzo ◽  
Carlo Romano` ◽  
Massimo Sorli
Keyword(s):  
Visual Information ◽  
Force Feedback ◽  
Angular Displacement ◽  
Cost Effective ◽  
Design Parameters ◽  
Haptic Interfaces ◽  
Wide Range ◽  
Improved Performance ◽  
Interface Devices ◽  
Giving Feedback

Haptic interfaces are human machine interface devices used for giving feedback sensations to an operator; they are used in a wide range of applications, like aeronautic fields, remote operation of manipulators in hostile or dangerous environments, and recently also for micro assembly machines and new surgery equipments. The major advantage of this technology is the improved performance of the operator himself, in fact it has been proven that having tactile sensation combined with visual information shortens reaction time. In this paper the authors show the process used to build a prototype of a master for tele-operation with force feedback on the operator. Once specifications on nominal force, bandwidth and angular displacement of the stick were established, a comparison between different kinematic solutions was carried out and a differential drive train was chosen as the core of the device. A linear dynamic model was then developed in order to predict system behaviour and estimate its main parameters. The dynamic analysis shows that the designed joystick can achieve the design parameters.

On the Design of an Intelligent Suspension for Controlling Passenger Vehicle Roll Stability

2002 ◽  
Author(s):  
David E. Simon ◽  
Mehdi Ahmadian
Keyword(s):  
Test Results ◽  
Control Policies ◽  
Performance Improvements ◽  
Additional Information ◽  
Significant Performance ◽  
Improved Performance ◽  
Road Testing ◽  
Vehicle Test ◽  
Displacement Based ◽  
Magneto Rheological

This paper will address the design, laboratory testing, and road testing of a semiactive suspension system for controlling the roll stability of a sport utility vehicle. Four magneto-rheological dampers, specially designed and built for the purpose of this testing, are described along with the vehicle test setup in the laboratory. Additionally, results from a series of tests conducted on the vehicle equipped with magneto-rheological dampers operated according to different control policies are documented. Displacement and velocity-based skyhook control techniques are evaluated among the methods that are implemented on the test vehicle. The test results indicate that neither velocity nor displacement based skyhook control are particularly better than the stock passive suspension (for the system inputs tested in the laboratory). In order to realize any significant performance improvements in practice, it may be necessary to augment the skyhook control methods with additional information, such as the steering angle. The results of this study further indicate that the performance potential of various skyhook control policies is heavily dependent on the tuning of both the controllable damper and the control strategy itself. Additionally, it was shown that velocity based skyhook control exhibits improved performance relative to displacement based skyhook control. It is worth noting that the results presented in this study are greatly affected by the class of vehicle as well as the specific dampers that are used for testing. Testing with a different class of vehicle or with a different type of dampers could result in significantly different conclusions.

Toward The Simultaneous Correction of Spherical and Chromatic Aberration in Electron Optics by Means of an Electrostatic Electron Mirror

1990 ◽  
Vol 48 (1) ◽  
pp. 206-207
Author(s):  
Gertrude. F. Rempfer
Keyword(s):  
Chromatic Aberration ◽  
Transverse Magnetic ◽  
Objective Lens ◽  
Ion Imaging ◽  
Corrected Image ◽  
Electric And Magnetic Fields ◽  
Chromatic Aberrations ◽  
Improved Performance ◽  
Electron Microscopes ◽  
Image Planes

Optimum performance in electron and ion imaging instruments, such as electron microscopes and probe-forming instruments, in most cases depends on a compromise either between imaging errors due to spherical and chromatic aberrations and the diffraction error or between the imaging errors and the current in the image. These compromises result in the use of very small angular apertures. Reducing the spherical and chromatic aberration coefficients would permit the use of larger apertures with resulting improved performance, granted that other problems such as incorrect operation of the instrument or spurious disturbances do not interfere. One approach to correcting aberrations which has been investigated extensively is through the use of multipole electric and magnetic fields. Another approach involves the use of foil windows. However, a practical system for correcting spherical and chromatic aberration is not yet available.Our approach to correction of spherical and chromatic aberration makes use of an electrostatic electron mirror. Early studies of the properties of electron mirrors were done by Recknagel. More recently my colleagues and I have studied the properties of the hyperbolic electron mirror as a function of the ratio of accelerating voltage to mirror voltage. The spherical and chromatic aberration coefficients of the mirror are of opposite sign (overcorrected) from those of electron lenses (undercorrected). This important property invites one to find a way to incorporate a correcting mirror in an electron microscope. Unfortunately, the parts of the beam heading toward and away from the mirror must be separated. A transverse magnetic field can separate the beams, but in general the deflection aberrations degrade the image. The key to avoiding the detrimental effects of deflection aberrations is to have deflections take place at image planes. Our separating system is shown in Fig. 1. Deflections take place at the separating magnet and also at two additional magnetic deflectors. The uncorrected magnified image formed by the objective lens is focused in the first deflector, and relay lenses transfer the image to the separating magnet. The interface lens and the hyperbolic mirror acting in zoom fashion return the corrected image to the separating magnet, and the second set of relay lenses transfers the image to the final deflector, where the beam is deflected onto the projection axis.

Analysis of magneto rheological elastomers for energy harvesting systems

2020 ◽  
Vol 64 (1-4) ◽  
pp. 439-446
Author(s):  
Gildas Diguet ◽  
Gael Sebald ◽  
Masami Nakano ◽  
Mickaël Lallart ◽  
Jean-Yves Cavaillé
Keyword(s):  
Magnetic Field ◽  
Energy Harvesting ◽  
Shear Strain ◽  
Magnetic Induction ◽  
Magnetic Particles ◽  
Homogeneous Magnetic Field ◽  
Electrical Signal ◽  
Harvesting Systems ◽  
Dc Bias ◽  
Magneto Rheological

Magneto Rheological Elastomers (MREs) are composite materials based on an elastomer filled by magnetic particles. Anisotropic MRE can be easily manufactured by curing the material under homogeneous magnetic field which creates column of particles. The magnetic and elastic properties are actually coupled making these MREs suitable for energy conversion. From these remarkable properties, an energy harvesting device is considered through the application of a DC bias magnetic induction on two MREs as a metal piece is applying an AC shear strain on them. Such strain therefore changes the permeabilities of the elastomers, hence generating an AC magnetic induction which can be converted into AC electrical signal with the help of a coil. The device is simulated with a Finite Element Method software to examine the effect of the MRE parameters, the DC bias magnetic induction and applied shear strain (amplitude and frequency) on the resulting electrical signal.

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