Design and Simulation of an MR Fluids-Based Haptic Actuator for Mobile Applications

2013 ◽  
Author(s):  
Semin Ryu ◽  
Jeong-Hoi Koo ◽  
Tae-Heon Yang ◽  
Dongbum Pyo ◽  
Ki-Uk Kyung ◽  
...  
Keyword(s):  
Simulation Model ◽  
Mobile Applications ◽  
Force Feedback ◽  
Resistive Force ◽  
Design Goal ◽  
Piston Head ◽  
Mr Fluids ◽  
Magneto Rheological ◽  
Novel Design ◽  
Model Dimension

This study presents a novel design of a miniature haptic actuator based on Magneto-Rheological (MR) fluids for mobile applications, and it evaluates the performance of a haptic actuator using a simulation model. The primary design goal for a haptic actuator for mobile applications is to miniaturize its size while generating realistic haptic sensations. To this end, this study proposes to design the MR actuator’s piston head (or plunger) in cone-shape and activate multiple modes of MR fluids (direct shear, flow and squeeze modes). Using a simulation model developed by integrating magnetic and force equations, the performance of a haptic actuator was evaluated in terms of the force (resistive force) produced by the actuator. The results show that a small actuator model, dimension of 10 mm (L) × 10 mm (W) × 6.5 mm (H), produced a maximum resistive force of about 5 N at 0.3 Watts, which is sufficient to provide force feedback to users.

scholarly journals Investigation of a Haptic Actuator Made with Magneto-Rheological Fluids for Haptic Shoes Applications

Actuators ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 5
Author(s):  
Yong Hae Heo ◽  
Sangkyu Byeon ◽  
Tae-Hoon Kim ◽  
In-Ho Yun ◽  
Jin Ryong Kim ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
Quantitative Evaluation ◽  
Material Properties ◽  
Closed Loop ◽  
Input Current ◽  
Solenoid Coil ◽  
Resistive Force ◽  
Mr Fluids ◽  
Multiple Operation ◽  
Magneto Rheological

This paper presents a magneto-rheological (MR) actuator that can be easily inserted into haptic shoes and can haptically simulate the material properties of the ground. To increase the resistive force of the proposed actuator, we designed a movable piston having multiple operation modes of MR fluids. Further, the design of a solenoid coil was optimized to maximize the resistive force in a limited-sized MR actuator. Simulations were conducted to predict the actuation performance and to show that the magnetic flux flows well by forming a closed loop in the proposed actuator. The quantitative evaluation of the proposed actuator was investigated by measuring the resistive force as a function of the input current and its pressed depth. From the result, we found that the proposed actuator can create over 600 N by adjusting the input current.

Structural Optimization Design of MR Fluid Clutch

2007 ◽  
Vol 546-549 ◽  
pp. 1673-1676 ◽  
Author(s):  
Wei Jia Meng ◽  
Zhan Wen Huang ◽  
Yan Ju Liu ◽  
Xiao Rong Wu ◽  
Yi Sun
Keyword(s):  
Magnetic Field ◽  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Optimization Design ◽  
Element Analysis ◽  
Mr Fluids ◽  
Magneto Rheological ◽  
Ferromagnetic Fluids ◽  
Ferromagnetic Particles

Magnetorheological (MR) fluids are suspensions of micron sized ferromagnetic particles dispersed in varying proportions of a variety of non-ferromagnetic fluids. MR fluids exhibit rapid, reversible and significant changes in their rheological (mechanical) properties while subjected to an external magnetic field. In this paper, a double-plate magneto-rheological fluid (MRF) clutch with controllable torque output have been designed. Electromagnetic finite element analysis is used to optimize the design of the clutch by using the commercial FEA software ANSYS.

scholarly journals A graph-based computerized optimal conceptual design synthesis within the distributed multi-disciplinary resource environment

2021 ◽  
Vol 9 (4B) ◽  
Author(s):  
Bin Chen ◽  
◽  
Jie Hu ◽  
Weixing Chen ◽  
◽  
...  
Keyword(s):  
Conceptual Design ◽  
Computer Applications ◽  
Design System ◽  
Design Synthesis ◽  
Design Goal ◽  
Design Resources ◽  
Novel Design ◽  
Resource Environment ◽  
Software Prototype ◽  
Related Design

The trend of inter-disciplinary conceptual design synthesis requires designers to involve more and more distributed multi-disciplinary design resources. Therefore, this paper proposes a graph-based computerized optimal conceptual design synthesis to help designers explore novel design schemes within the distributed multi-disciplinary resource environment. The design resources tightly related to the design goal can be extracted from the huge resource environment by a proposed searching engine. The optimal design scheme can be generated from these related design resources by a proposed graph-based algorithm. A set of computer applications called Automatic Conceptual Design System (ACDS) is established to verify the feasibility of this proposed conceptual design synthesis, and a garbage power system’s conceptual design is completed by this software prototype.

PREPARATION AND ABRASION PROPERTIES OF MAGNETO-RHEOLOGICAL FLUID OF DISPERSED SILICA-COATED IRON

2005 ◽  
Vol 19 (07n09) ◽  
pp. 1121-1127 ◽  
Author(s):  
A. SHIBAYAMA ◽  
T. OTOMO ◽  
Y. AKAGAMI ◽  
K. SHIMADA ◽  
T. FUJITA
Keyword(s):  
Carbonyl Iron ◽  
Spherical Particles ◽  
Fluid Viscosity ◽  
Iron Particles ◽  
Mr Fluid ◽  
Abrasion Test ◽  
Silicon Oil ◽  
Mr Fluids ◽  
Transmission Oil ◽  
Magneto Rheological

In this study, a magneto-rheological fluid dispersed by silica-coated iron was developed and its properties such as fluid viscosity (shear stress or shear rate) and abrasion were investigated. The metallic iron coated by silica dispersed in magneto-rheological fluid was prepared by H 2 reducing of precipitated magnetite ( Fe 3 O 4). Then, the magneto-rheological fluid (MR fluid) for the seal was prepared with silica-coated iron or carbonyl iron (HQ type; diameter of 1.6-1.9 10-6m) and two solvent oils i.e. silicon oil (SH200cv, 10000cSt) and CVT oil (T-CVTF, automobile transmission oil). It was observed that the MR fluid viscosity of CVT oil with HQ particles is lower in every fluid condition. Furthermore, the surface roughness of polyvinyl plate after abrasion test for MR fluid with silica coated iron and CVT oil as solvent was higher compared to the other types of MR fluids. The results indicated that carbonyl iron (spherical particles) and silica-coated iron particles dispersed in silicon oil are feasible to be used where the low abrasion in mechanics is required.

Integrating a Grasp Exoskeleton Into a String-Based Interface for Human-Scale Interactions

2008 ◽  
Vol 8 (4) ◽  
Author(s):  
Rasul Fesharakifard ◽  
Maryam Khalili ◽  
Laure Leroy ◽  
Alexis Paljic ◽  
Philippe Fuchs
Keyword(s):  
Virtual Environments ◽  
Degrees Of Freedom ◽  
Force Feedback ◽  
Control Method ◽  
Hybrid Control ◽  
Force Sensor ◽  
Virtual Objects ◽  
Rotary Encoder ◽  
Human Scale ◽  
Novel Design

A grasp exoskeleton actuated by a string-based platform is proposed to provide the force feedback for a user’s hand in human-scale virtual environments. The user of this interface accedes to seven active degrees of freedom in interaction with virtual objects, which comprises three degrees of translation, three degrees of rotation, and one degree of grasping. The exoskeleton has a light and ergonomic structure and provides the grasp gesture for five fingers. The actuation of the exoskeleton is performed by eight strings that are the parallel arms of the platform. Each string is connected to a block of motor, rotary encoder, and force sensor with a novel design to create the necessary force and precision for the interface. A hybrid control method based on the string’s tension measured by the force sensor is developed to resolve the ordinary problems of string-based interface. The blocks could be moved on a cubic frame around the virtual environment. Finally the results of preliminary experimentation of interface are presented to show its practical characteristics. Also the interface is mounted on an automotive model to demonstrate its industrial adaptability.

scholarly journals Research on Torque Ratio Based on the Steering Wheel Torque Characteristic for Steer-by-Wire System

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Yandong Han ◽  
Lei He ◽  
Xiang Wang ◽  
Changfu Zong
Keyword(s):  
Force Feedback ◽  
Characteristic Curve ◽  
Transmission Ratio ◽  
Steering Wheel ◽  
Vehicle Handling ◽  
Design Goal ◽  
Torque Transmission ◽  
Steer By Wire ◽  
Wheel Torque ◽  
Wire System

Steer-by-wire system can improve the performance of vehicle handling stability. Removing the mechanical linkages between the front wheels and the steering wheel leads to a key technique of force feedback for steer-by-wire system. In view of the characteristic of variable torque transmission ratio for steer-by-wire system, this paper proposes a method for designing torque ratio based on the steering wheel torque characteristic for steer-by-wire system. It converts the torque ratio design into equivalent assist torque design by analyzing their relationship. It achieves the torque ratio design at different conditions based on the negative equivalent assist torque characteristic curve. Simulations and vehicle experiments are conducted by the proposed method, and the results show that the design goal has been achieved and the steering wheel torque characteristic obtained is very similar to that of the reference car.

A Miniature MR Actuator With Impedance Sensing Mechanism for Haptic Applications

2012 ◽  
Author(s):  
Tae-Heon Yang ◽  
Jeong-Hoi Koo ◽  
Sang-Youn Kim ◽  
Dong-Soo Kwon
Keyword(s):  
Electronic Devices ◽  
Impedance Change ◽  
Solenoid Coil ◽  
Impedance Sensing ◽  
Resistive Force ◽  
Sensing Mechanism ◽  
Mr Fluids ◽  
Haptic Sensation ◽  
Sensing Performance ◽  
Small Stroke

This paper presents a miniature haptic actuator based on MR fluids, which is designed to convey realistic haptic sensations to users in small electronic devices. The proposed MR actuator can create various kinaesthetic sensations. The haptic sensation, which is generated in the form of resistive force, should vary according to the stroke of the actuator (or the pressed depth of the plunger). Thus, a sensing method for gauging the pressed depth should be integrated into the proposed actuator for demonstrating its real-world haptic application. To determine the pressed depth of the MR actuator, this study proposes an impedance sensing mechanism. The proposed sensing method measures the impedance change of the solenoid coil embedded in the actuator in the form of voltages to estimate the pressed depth. Using a prototype actuator, the sensing performance of the proposed sensing method, was evaluated. The results show that the sensitivity of the proposed impedance sensing method is sufficient to regulate the output resistive force over a small stroke range of the actuator.

Nonsymmetric Groove Pattern Design for Precise Micro-Spindles

2006 ◽  
Vol 326-328 ◽  
pp. 1595-1598
Author(s):  
Dong Ho Oh ◽  
Nam Hoon Lee ◽  
Ja Choon Koo ◽  
Hyeon Ki Choi ◽  
Yeon Sun Choi
Keyword(s):  
Power Consumption ◽  
Mobile Applications ◽  
Fluid Dynamic ◽  
Design Solution ◽  
Pattern Design ◽  
Technology Sector ◽  
Fluid Dynamic Bearing ◽  
Limited Power ◽  
Small Form Factor ◽  
Novel Design

As the fluid dynamic bearing spindles are to be actively adopted to various small form factor mobile applications, mechanical specifications for the motors have been aggressively changed to pursue the fierce information technology sector market trend. One of the major technological challenges for the spindles to be successfully employed in the applications is the reduction of power consumption since the most of the mobile applications operate with a limited power source at relatively lower voltage. Recognizing implication of the power consumption that of course affects stiffness of the spindle, few of options for mechanical designers are available but either lowering rotational speed or adopting thinner lubricant. In the present work, a novel design solution for alleviating side effect of the lower stiffness spindle is introduced and verified.

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