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.

Research on the Adaptive Fuzzy Control Based on Variable Universe of with Magneto-Rheological Suspension

2012 ◽  
Vol 433-440 ◽  
pp. 7112-7118 ◽  
Author(s):  
Min Duan ◽  
Gang Li ◽  
Jing Shi ◽  
Hai Hua Su
Keyword(s):  
Fuzzy Control ◽  
Adaptive Fuzzy Control ◽  
Mr Damper ◽  
Variable Domain ◽  
Element Analysis ◽  
Car Model ◽  
Variable Universe ◽  
Adaptive Law ◽  
Suspension Control ◽  
Magneto Rheological

The magnetic circuit of MR damper was given,Finite Element Analysis and the structure optimization of MR damper were reserched.The theory of a variable domain by adopting an adaptive algorithm based on fuzzy-control was applied in semi-active suspension control with MR damper.The adaptive law for membership functiongs was designed for input and output.Based on 2DOF 1/4 car model with the simulationed for road protile as random input,the control simulation of MR semi-actibe suspension was carried out,results show that spring mass acceleration reduced while an adaptive algorithim with a variable domain fuzzy control was used to compare with ordinary strategy,the riding comfort got improved.

Optimal Design of an Hybrid Magnetorheological Brake for Middle-Sized Motorcycles

2011 ◽  
Vol 52-54 ◽  
pp. 371-377 ◽  
Author(s):  
Quoc Hung Nguyen ◽  
Jun Cheol Jeon ◽  
Seung Bok Choi
Keyword(s):  
Optimal Design ◽  
Magnetic Circuit ◽  
Optimization Procedure ◽  
Zero Field ◽  
Element Analysis ◽  
Mr Fluid ◽  
The Finite Element Analysis ◽  
Hybrid Concept ◽  
Braking Torque ◽  
Magneto Rheological

This research focuses on developing a new configuration and optimal design of magneto-rheological (MR) brake for a middle-sized motorcycle which can replace conventional drum-type brake. The proposed MR brake mechanism utilizes a hybrid concept of magnetic circuit (using both axial and radial magnetic flux) to generate braking force. In the optimization, the required braking torque, the temperature due to zero field friction of MR fluid, the mass of the brake system and all significant geometric dimensions are considered. After a brief introduction of the proposed MR brake configuration, the braking torque is derived based on Herschel-Bulkley rheological model of the MR fluid. The optimal design of the MR brake is then analyzed. An optimization procedure based on the finite element analysis (FEA) integrated with an optimization tool is used to obtain optimal geometric dimensions of the MR brake. From the results, discussions on the performance improvement of the optimized MR brake are described.

scholarly journals Iterative Method in the Characterization of Piezoceramics of Industrial Interest

2006 ◽  
Vol 45 ◽  
pp. 2448-2458 ◽  
Author(s):  
L. Pardo ◽  
Miguel Algueró ◽  
K. Brebøl
Keyword(s):  
Iterative Method ◽  
Shear Mode ◽  
Element Analysis ◽  
Simulation Based ◽  
The Finite Element Analysis ◽  
The Matrix ◽  
Fea Simulation ◽  
Complex Characterization

Although characterization of piezoceramics from resonance is a customary technique, the works dealing with the determination of the ten elastic, dielectric and piezoelectric coefficients that are needed in the full matrix characterization of such 6mm symmetry materials are rather scarce. Even more, if the complex characterization is foreseen, thus accounting with the three types of losses, few are the methods avaliable to obtain the material linear coefficients. This work deals with such complex characterization by the use of Alemany et al. automatic iterative method. This method has been applied to the four modes of resonance that are sufficient for the purpose: (1) the length extensional mode of long rods, length poled, (2) the thickness extensional mode and (3) the radial mode of a thin disk, thickness poled, and (4) the thickness shear mode of a thin plate. Recent work of the authors has shown the limits in characterizing materials that arise from the use of the Standard shear geometry and, therefore, and alternative geometry is used here. This work presents the matrix characterization of some piezoceramics and the Finite Element Analysis (FEA) simulation based on such characterization, of the samples used as a reliability criteria of the results obtained by comparison of the experimental and simulated values at resonance of the electrical parameters.

Punch Wear in the Forming of Deep Holes with Pulse Ram Motion on a Servo Press

2014 ◽  
Vol 611-612 ◽  
pp. 127-133 ◽  
Author(s):  
Ryo Matsumoto ◽  
Hiroshi Utsunomiya
Keyword(s):  
Cold Extrusion ◽  
Low Friction ◽  
Element Analysis ◽  
Liquid Lubricant ◽  
Backward Extrusion ◽  
Servo Press ◽  
The Finite Element Analysis ◽  
The Relationship ◽  
Punch Wear ◽  
Extrusion Method

For the fabrication of lightweight components such as hollow components, we proposed a cold extrusion method for forming of deep holes that utilizes a punch with an internal channel for the supply of liquid lubricant using a servo press. The relationship between the punch ram motion and the punch wear in the proposed forming method is investigated by the finite element analysis in this study. The punch wear is determined by using the Archard’s equation. Although low friction at specimen–punch interface realizes in the forming with pulse punch ram motion (proposed forming method), the punch wear in the backward extrusion with pulse punch ram motion is 1.1–2.4 times larger than that with no pulse punch ram motion (conventional forming method). The influence of punch ram motion and friction on the punch wear is discussed.

Optimal Current Value Estimation for an Automotive Magneto Rheological (MR) Fluid Damper Actuation

2015 ◽  
Vol 812 ◽  
pp. 93-101 ◽  
Author(s):  
J. Jancirani ◽  
A.J.D. Nanthakumar ◽  
P. Niketh
Keyword(s):  
Finite Element ◽  
Mr Damper ◽  
Element Model ◽  
Damping Force ◽  
Element Analysis ◽  
Optimal Current ◽  
Value Estimation ◽  
Current Value ◽  
Magneto Rheological ◽  
Mr Fluid Damper

In this paper, a finite element analysis of a Magneto Rheological (MR) damper is carried over. A finite element model was constructed to analyse and examine the MR damper. The optimal current value for achieving the required damping force is found out. The results of the work can be used to develop more efficient and reliable MR damper, thereby reducing the time involved in prototyping the product.

The Optimization of Piston Groove Diameter Based on ABAQUS

2013 ◽  
Vol 397-400 ◽  
pp. 1045-1049
Author(s):  
Sheng Guan Qu ◽  
Wen Long Li ◽  
Bin Li
Keyword(s):  
Contact Pressure ◽  
Analysis Software ◽  
Low Friction ◽  
Element Analysis ◽  
Wear Resistant ◽  
Seal Failure ◽  
The Finite Element Analysis ◽  
Two Factors ◽  
The Relationship ◽  
Lower Contact

Two factors must be given considered in low friction cylinder , which are sealing and wear. A lower contact pressure can lead to seal failure. However, a heavier contact press can increase friction force and wear. In the present paper a method have been proposed to obtain the optimal contact pressure between PTFE wear-resistant ring and the steel bushing at first, with analysis of the relationship among the surface roughness, the sealing contact pressure and the leakage. Secondly,the piston groove Diameter has been designed by using the finite element analysis software of ABAQUS to simulate the Mooney-Rivlin model, which is corresponding to this optimal contact pressure. On the premise of meeting the requirement of the specific leakage standard between the cylinder and the wear-resistant ring, the optimal contact pressure and the corresponding piston groove size have been obtained, with different surface roughnesses of the friction pairs.

Design Optimization of Squeeze Mode Magnetorheological Damper

2018 ◽  
Vol 877 ◽  
pp. 391-396
Author(s):  
Jitenkumar D. Patel ◽  
Dipal Patel
Keyword(s):  
Vibration Isolation ◽  
Mr Damper ◽  
Magnetorheological Damper ◽  
Design Parameters ◽  
Flow Mode ◽  
Shear Mode ◽  
Optimized Design ◽  
Engine Mount ◽  
Low Amplitude ◽  
Femm Software

Mostly, magnetorheological damper research is going on flow mode and shear mode type of damper. Less work is carried out by researcher on squeeze mode type of damper. This will give higher force as compare to flow mode and shear mode type of MRF damper at low excitation. So, this kind of damper can be used as vibration isolation for high impact loading at low amplitude application like engine mount. Aim of this paper is optimized design of Squeeze mode damper for low amplitude application by using design of experiment tool. For design of squeeze mode type of MR damper magnetic field distribution is very important study to improve damping performance. Various parameters like length of coil, diameter of squeeze plate, current passing through coil, number of turns, area of coil and MR fluid gap are considered during optimization and optimization is done by using FEMM software It shows that length of coil, Number of turn and area of coil increases damping performance improves. Other design parameters are check out with mathematical model of MR damper with theoretical calculation like effect of frequency of excitation, diameter of squeeze plate, thick ness of squeeze plate and amplitude of excitation.

Researches of a Magneto-Rheological Fluid Damper with External Coil Based on Electromagnetic Finite Element Analysis

2012 ◽  
Vol 490-495 ◽  
pp. 3427-3431
Author(s):  
Xiao Mei Xu ◽  
Cai Min Zeng
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
Mr Fluid ◽  
Damping Characteristics ◽  
Fluid Damper ◽  
New Type ◽  
Fluid Dampers ◽  
Magneto Rheological ◽  
Mr Fluid Damper

In vibration control field magneto-rheological (MR) fluid dampers are semi-active control devices that have recently begun to receive more attention. This paper presents a new type of MR fluid damper with external coil. The new structure of the damper was optimized and analyzed based on a static magnetic analysis with the help of electromagnetic finite element analysis (FEA) using the software of ANSYS. The damping characteristics of the damper were theoretically researched. Research results show that the designed MR fluid damper with external coil has wider scope of damping adjustment and strong energy-dissipating ability. The study method in this paper and the obtained results will help designers to create more efficient and reliable MR fluid dampers.

Experimental Investigation of the Energy Dissipated in a Magneto-Rheological Damper for Semi-Active Vehicle Suspensions

2003 ◽  
Author(s):  
Fernando D. Goncalves ◽  
Mehdi Ahmadian
Keyword(s):  
Yield Stress ◽  
Energy Input ◽  
Hybrid Control ◽  
Mr Damper ◽  
Energy Ratio ◽  
Mr Fluid ◽  
Vehicle Suspensions ◽  
Fluid Dampers ◽  
Magneto Rheological ◽  
Energy Dissipated

Magneto-rheological (MR) fluid dampers are often characterized by their field-dependent yield stress. This fielddependent yield stress and their fast response time make MR fluid dampers attractive alternatives to conventional viscous dampers. In comparing passive dampers with MR dampers, an equivalent viscous damping coefficient is often found from the energy dissipated by the MR damper. This study considers the energy dissipated by the MR damper under semi-active control. A hybrid control policy for semi-active vehicle suspensions is considered. A quarter car rig was used to evaluate the dynamics of the hybrid suspension using an MR damper. The steady-state performance of hybrid control is investigated with regard to the RMS displacements and accelerations of the sprung and unsprung masses. A frequency domain analysis is also presented. The transmissibilities of the sprung and unsprung masses are found using a range specific chirp signal. Results indicate that hybrid control with equal contributions from skyhook and groundhook can offer benefits to both the sprung and unsprung masses. With the performance of the hybrid semi-active suspension known, the study then considers the energy dissipated by the MR damper under hybrid control. An investigation into the possible correlation between performance and the energy dissipated by the MR damper is presented. Force-displacement curves are generated and an energy ratio is introduced. The energy ratio is the energy metric used to evaluate the energy dissipation of the MR damper. The energy ratio is defined as the ratio of the energy dissipated by the MR damper and the energy input into the system. The results indicate that the MR damper under hybrid control can dissipate nearly 70% of the energy input to the system.

Sign in / Sign up

Export Citation Format

Share Document