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http://dx.doi.org/10.5139/JKSAS.2019.47.10.738

Analysis Model for Design Based on Stiffness Requirement of Direct Drive Electromechanical Actuator  

Oh, Sang Gwan (Korea Aerospace Research Institute)
Lee, Hee Joong (Korea Aerospace Research Institute)
Park, Hyun Jong (Korea Aerospace Research Institute)
Oh, Dongho (School of Mechanical Engineering, Chungnam National University)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.47, no.10, 2019 , pp. 738-746 More about this Journal
Abstract
Instead of hydraulic actuation systems, an electromechanical actuation system is more efficient in terms of weight, cost, and test evaluation in the thrust vector control of the 7-ton gimbal engine used in the Korea Space Launch Vehicle-II(KSLV-II) $3^{rd}$ stage. The electromechanical actuator is a kind of servo actuator with position feedback and uses a BLDC motor that can operate at high vacuum. In the case of the gimballed rocket engine, a synthetic resonance phenomenon may occur due to a combination of a vibration mode of the actuator itself, a bending mode of the launcher structure, and an inertial load of the gimbals engine. When the synthetic resonance occurs, the control of the rocket attitude becomes unstable. Therefore, the requirements for the stiffness have been applied in consideration of the gimbal engine characteristics, the support structure, and the actuating system. For the 7-ton gimbal engine of the KSLV-II $3^{rd}$ stage, the stiffness requirement of the actuation system is $3.94{\times}10^7N/m$, and the direct drive type electromechanical actuator is designed to satisfy this requirement. In this paper, an equivalent stiffness analysis model of a direct drive electromechanical actuator designed based on the stiffness requirements is proposed and verified by experimental results.
Keywords
Analysis Model; Stiffness Requirement; Direct Drive Electromechanical Actuator; Thrust Vector Control; KSLV-II;
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Times Cited By KSCI : 2  (Citation Analysis)
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