Shape design and performance evaluation of small lightweight MR brake for improvement torque
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DOI 10.1007/s12206-020-1025-3
Journal of Mechanical Science and Technology 34 (11) 2020 Original Article DOI 10.1007/s12206-020-1025-3 Keywords: · MRF (magneto-rheological fluid) · Brake · Shape design · FEM (finite element method) · Torque
Correspondence to: Myeong-Kwan Park [email protected]
Citation: Lee, D.-Y., Park, M.-K. (2020). Shape design and performance evaluation of small lightweight MR brake for improvement torque. Journal of Mechanical Science and Technology 34 (11) (2020) 4675~4683. http://doi.org/10.1007/s12206-020-1025-3
Shape design and performance evaluation of small lightweight MR brake for improvement torque Do-Young Lee1 and Myeong-Kwan Park2 1
2
School of Aeronautical Maintenance, Daegu Technical University, Daegu, Korea, School of Mechanical Engineering, Pusan National University, Busan, Korea
Abstract In this paper, the shape design of the T-flange type MR brake for weight reduction is studied theoretically. And the small lightweight MR brake shape design with an intuitive structure having high output torque is proposed. The equations for transmitted torque are derived according to T-flange configurations of the MR brake. The validity of the theoretical results is verified by the analyses of an electromagnet using the finite element method. The magnetic flux density is evenly distributed in the T-flange type MR brake. Then the effectiveness of the propsoed MR brake braking torque is verified to reinforce by comparing the output torque of the disk type MR brake through the experiment. The output torque performance is exhibited in 2.2 times as compared to the disk type MR brake.
Received March 31st, 2020 Revised
August 5th, 2020
Accepted August 18th, 2020 † Recommended by Editor Seungjae Min
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
1. Introduction In the aviation industry, miniaturization and weight reduction of machinery are inevitably required. The taxiing fixed-wing UAV employed expensive equipment is needed a brake device that can be safely recovered. The typical brake systems categorize several types based on their roles. They are made of complex mechanical parts operated by a hydraulic, a pneumatic, an electrical system having a heavy weight. They have to be replaced with new parts after used during length of time as well as the sufficient space need to install the brake systems. In general, these systems are used to wide variety of the industrial field in spite of holding the inefficient way because there is no clear way to substitute. Recently, the numerous studies of the braking device applied the magneto-rheological fluid (MRF) are progressed in the various ways to improve performance better than the conventional brake systems. The braking device applied MRF utilizes the shear stress of a reversible fluid in accordance with the magnetic field intensity. It can solve a lot of problems of the conventional brake systems. The MRF has the rheological properties of the fast response within mili-second by apply
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