Choi, Jae-hoon Jung, Chanyul Kim, Yeonghun Kim, Chang-hwan Park, Shinsuk Cho, Kyu-Jin Kim, Seung-Jong 2024-01-20T01:03:22Z 2024-01-20T01:03:22Z 2021-09-05 2017-07 2234-7593 https://pubs.kist.re.kr/handle/201004/122563 Haptic systems render virtual reality by providing kinesthetic, tactile senses to an operator through a haptic device. Previous researchers analyzed haptic systems' stability and performance issues. On haptic frameworks, a virtual coupling network that provides compliance between the haptic device and the virtual proxy for passivity distorts realistic interaction with virtual environment. That is, the operator will experience resistance even when the environment simulates free-motion. This paper suggests a virtual coupling triggering algorithm for improving free-motion performance of a haptic interface. A 1DOF exoskeleton for a knee joint is designed, and admittance control is used instead of compensating device dynamics to enable wide implementation of the haptic interface, up to a heavy and bulky haptic device. The algorithm utilizes surface EMG (sEMG) signal, which is easily collected from operators. Proper virtual coupling is designed according to previously derived guidelines for unconditional stability criteria. A method for pattern recognition of sEMG signal and a triggering algorithm corresponding to the recognized patterns are explained. The suggested algorithm successfully reduces peak of interaction force between the device and the operator by about half when the haptic interface simulates free-motion. Corresponding simulations and experiments are presented. English KOREAN SOC PRECISION ENG TIME Virtual coupling triggering for interaction force reduction of haptic free-motion using surface EMG Article 10.1007/s12541-017-0119-z 1 INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING, v.18, no.7, pp.1013 - 1020 INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING 18 7 1013 1020 scie scopus kci ART002238164 000405103000012 2-s2.0-85022015427 Engineering, Manufacturing Engineering, Mechanical Engineering Article TIME Haptics Virtual coupling network Unconditional stability Free-motion Exoskeleton sEMG pattern recognition