Abstract
Conventional rectangular path generating mechanisms can not avoid structural complexity due to the large number of components and high degree of freedom. Therefore, the authors present a simplified rectangular path generating mechanism using an ellipse. The mechanism not only consists of much fewer components than conventional mechanisms, but also has one degree of freedom. In the design procedure, a reverse kinematic design is implemented, and a theoretical analysis of the displacement, velocity and acceleration is conducted to validate the superiority of this mechanism. In particular, this paper highlights the low acceleration values at the contact points between the ellipse and the frame. This is noteworthy since acceleration is directly correlated with impulsive forces that induce early malfunctions, low stability and wear in devices using such mechanisms. In addition, this paper discusses achieving optimal eccentricity to have the lowest acceleration at the corners. Lastly, a dynamics analysis for two cases–a mechanism with a perfect circle and a mechanism with an ellipse–is carried out using dynamic analysis software to investigate real reaction force at the corners. Conclusively, the novelty of the mechanism using an ellipse is validated through the kinematics and dynamics analyses.
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Dongkyu Lee received his B.S. and M.S. degrees from Korea Aerospace University, Korea, in 2012 and 2014, respectively, and is now a Ph.D. candidate at Korea Aerospace University. His major research interests include mechanical designs for microrobot including in-pipe robot and robotic colonoscope.
Kukha Hwang received his B.S. degree from Korea Aerospace University, Korea, in 2016, and is now in a Master’s course at Korea Aerospace University. His current research interests include numerical analysis and design for space mechanisms.
Byungkyu Kim received his Ph.D. in mechanical engineering from the University of Wisconsin, Madison, in 1997. From 1997 to 2000, he was a Technical Staff Member of Center for X-ray Lithography in the University of Wisconsin where he developed a computer code for thermal modeling of a mask membrane and wafer during beam exposure. From 2000 to 2005, he worked for Microsystem Center of KIST as a Principal Research Scientist. He was in charge of developing a microcapsule-type robotic endoscope. Currently, he is a Professor in Korea Aerospace University. His research interest includes space mechanism, robotics, micro/nano-manipulator and bio/medical application robots.
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Lee, D., Hwang, K. & Kim, B. Design and simulation for a one-degree-of-freedom-based rectangular path generating mechanism using an ellipse. J Mech Sci Technol 31, 2923–2932 (2017). https://doi.org/10.1007/s12206-017-0535-0
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DOI: https://doi.org/10.1007/s12206-017-0535-0