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Stable Switching PD Control Using Hunt-Crossley Model for a Press Platform

Authors
Nam, Jeong-UnYang, Yun-JaeYoon, Tae-Woong
Issue Date
8월-2021
Publisher
INST CONTROL ROBOTICS & SYSTEMS, KOREAN INST ELECTRICAL ENGINEERS
Keywords
Hunt-Crossley model; PD force feedback control; PD position feedback force control; switching system
Citation
INTERNATIONAL JOURNAL OF CONTROL AUTOMATION AND SYSTEMS, v.19, no.8, pp.2821 - 2829
Indexed
SCIE
SCOPUS
KCI
Journal Title
INTERNATIONAL JOURNAL OF CONTROL AUTOMATION AND SYSTEMS
Volume
19
Number
8
Start Page
2821
End Page
2829
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/137036
DOI
10.1007/s12555-020-0611-6
ISSN
1598-6446
Abstract
This study proposes a switching proportional-derivative (PD) controller for a press platform for inspecting the surfaces of a wind turbine blade. We use the Hunt-Crossley model to represent the probe shape or the nonlinearity of the inspection platform. This model consists of a nonlinear spring and a damper; therefore, it is more accurate than linear spring-damper models. We prove the global asymptotic stability of a PD force feedback controller and a PD position feedback (force) controller. However, both the controllers suffer from implementation-related problems. Specifically, the PD force feedback controller makes the impact force large, and the PD position feedback controller cannot easily measure small position changes when the platform contacts the surface. These problems of each controller are solved by switching the two controllers. The PD force feedback control and PD position feedback control are used when the platform is in the contact and noncontact states, respectively. We prove that the proposed switching PD force/position feedback controller is globally asymptotically stable. Further, simulations show satisfactory performance resulting from stable switching between the two control schemes.
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