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Computational and Mathematical Methods in Medicine
Volume 2016 (2016), Article ID 8979070, 14 pages
http://dx.doi.org/10.1155/2016/8979070
Research Article

Development of Magnetorheological Resistive Exercise Device for Rowing Machine

Mechanical Engineering Department, Mechanical Engineering and Design Faculty, Kaunas University of Technology, Studentu 56-302, LT-54214 Kaunas, Lithuania

Received 30 December 2015; Revised 24 March 2016; Accepted 11 April 2016

Academic Editor: Guan H. Yeoh

Copyright © 2016 Vytautas Grigas et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Training equipment used by professional sportsmen has a great impact on their sport performance. Most universal exercisers may help only to improve the general physical condition due to the specific kinematics and peculiar resistance generated by their loading units. Training of effective techniques and learning of psychomotor skills are possible only when exercisers conform to the movements and resistance typical for particular sports kinematically and dynamically. Methodology of developing a magnetorheological resistive exercise device for generating the desired law of passive resistance force and its application in a lever-type rowing machine are described in the paper. The structural parameters of a controllable hydraulic cylinder type device were found by means of the computational fluid dynamics simulation performed by ANSYS CFX software. Parameters describing the magnetorheological fluid as non-Newtonian were determined by combining numerical and experimental research of the resistance force generated by the original magnetorheological damper. A structural scheme of the device control system was developed and the variation of the strength of magnetic field that affects the magnetorheological fluid circulating in the device was determined, ensuring a variation of the resistance force on the oar handle adequate for the resistance that occurs during a real boat rowing stroke.