This paper presents an improved input shaping method to eliminate vibration during circular interpolation of a flexible 2-axis positioning system. Due to the time delay introduced by input shaping, simultaneous 2-axis positioning with circular interpolation results in a certain amount of errors from the intended track or trajectory. This study investigated the track errors associated with circular interpolation caused by input shaping for a flexible 2-axis positioning system. The following three strategies for reducing such errors were proposed: velocity reduction in circular interpolation, adjustment of the time delay between 2 axes commands, and employment of a velocity profile compensation function. Simulations were performed to discuss the pros and cons of the three proposed strategies. Experiments were also performed to validate the results. Simulation and experiments showed that the track errors due to input shaping can be sufficiently reduced by combined use of the proposed strategies.
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A Study on the Improvement of Machining Precision by Applying Input Shaping Method to Machining Center Kang-Ho Ko, Dong-Wook Lim, Seong-Wook Hong Journal of the Korean Society of Manufacturing Technology Engineers.2023; 32(4): 189. CrossRef
Input-shaping-based improvement in the machining precision of laser micromachining systems Dong-Wook Lim, Seong-Wook Hong, Seok-Jae Ha, Ji-Hun Kim, Hyun-Taek Lee The International Journal of Advanced Manufacturing Technology.2023; 125(9-10): 4415. CrossRef
Application of Input Shaping to a CNC Laser Processing Machine to Enhance Processing Precision Kang Ho Ko, Jin Uk Sim, Seong-Wook Hong Journal of the Korean Society of Manufacturing Technology Engineers.2022; 31(5): 346. CrossRef
Most positioning systems experience residual vibration during operation. Such residual vibration can be eliminated or reduced to an acceptable level by using the input shaping method. However, adopting the input shaping methods typically introduces a certain amount of time-delay into a system. This study focused on the development of a delay-time adjustable input shaping method to eliminate vibration caused by repetitive motion in positioning systems. The proposed input shaping method, called the virtual mode (VM) input shaper, uses a virtual frequency parameter that adjusts delay-time and cancels residual vibration. Unlike most previous input shaping studies, this study investigated VM input shaping performance to eliminate the steady-state vibration induced by repetitive motion in positioning systems. To this end, an analytical formulation was derived and used for simulating the input shaping performance with varying dominant parameters involved in a system. Experiments were also performed to validate the proposed method.
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Data Driven Vibration Control: A Review Weiyi Yang, Shuai Li, Xin Luo IEEE/CAA Journal of Automatica Sinica.2024; 11(9): 1898. CrossRef
Improved Input Shaping Method for Circular Interpolation of a 2-Axis Positioning System Jin Uk Sim, Pil Kyu Choi, Sun-Woong Kwon, Seong-Wook Hong Journal of the Korean Society for Precision Engineering.2022; 39(4): 283. CrossRef
Application of Input Shaping to a CNC Laser Processing Machine to Enhance Processing Precision Kang Ho Ko, Jin Uk Sim, Seong-Wook Hong Journal of the Korean Society of Manufacturing Technology Engineers.2022; 31(5): 346. CrossRef
The residual vibration during the high acceleration and deceleration of a motion stage degrades the manufacturingsystem productivity and lifespan. Although a passive RFC mechanism with a movable magnet track reduces the residual vibration of the system base, a magnet track resonance may occur according to the motion profile, and the mover inposition error increases due to the residual vibration of the magnet track. We investigated input-shaping methods for a linear motor motion stage with a passive RFC mechanism. An air-bearing linear motor motion stage with the passive RFC mechanism is built, and the dynamic characteristic of the passive RFC mechanism is identified using a freevibration test. Then, mover velocity profiles are generated using various input-shaping methods. Further, the effects of the input-shaping methods on the air-bearing linear motor motion stage are investigated by comparing the magnet track oscillation, settling time, and mover in-position error. Finally, several input-shaping methods are applied to reduce the mover rise-time delay for the proposed linear motor motion stage. A properly shaped input motion profile removes the residual vibration of the passive RFC mechanism without any additional devices, as well as reducing the transmitted reaction force and the in-position error.
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Fuzzy Neural Network Control for a Reaction Force Compensation Linear Motor Motion Stage Kyung Ho Yang, Hyeong-Joon Ahn International Journal of Precision Engineering and Manufacturing-Smart Technology.2024; 2(2): 109. CrossRef
Software-Based Integral Product Architecture for Modular Motion Control System of a RFC Linear Motor Motion Stage: Model-Based DOB for Residual Vibration Suppression Seong Jong Yoo, Hyeong-Joon Ahn International Journal of Precision Engineering and Manufacturing.2020; 21(2): 203. CrossRef
Evaluation of Input Shaping Methods for the Nonlinear Vibration System Using a Furuta Pendulum Anh-Duc Pham, Hyeong-Joon Ahn Journal of the Korean Society for Precision Engineering.2020; 37(11): 827. CrossRef
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