Abstract
Not only the motor function, but also the sensory function to recognize environments is often deteriorated in elderly persons. Due to the decline of the perception ability, they may encounter accidents such as stumbling. The concept of perception-assist has been proposed to avoid those accidents by automatically modifying their motion using an exoskeleton robot. In perception-assist, the lower-limb exoskeleton tries to modify user's motion automatically for avoiding accidents such as stumbling. The stumbling may be caused by insufficient ankle dorsiflexion as well as lack of lifting up a leg. Therefore, in addition to the motion assist for hip and knee joints, ankle joints also should be assisted to avoid stumbling. Consequently, 3DOF (hip, knee, and ankle joints) motion assist is preferred in each leg in the lower-limb exoskeleton robot, although the minimum degrees of freedom to modify the tip motion of the leg on the sagittal plane is 2DOF. Thus, the power-assist robot with perception-assist has redundant degree of freedom in the user's foot motion modification on the sagittal plane. In the power-assist robot with perception-assist, the redundant degree of freedom can be used to control the modifying motion by utilizing a null space. In this paper, the effective cost function of the null space is proposed for considering the movable range of each user and control of the ankle angle for the robot's energy efficiency. The effectiveness of the proposed cost function was evaluated by conducting experiments.
| Original language | English |
|---|---|
| Title of host publication | 2017 IEEE International Conference on Cyborg and Bionic Systems, CBS 2017 |
| Publisher | Institute of Electrical and Electronics Engineers Inc. |
| Pages | 277-281 |
| Number of pages | 5 |
| ISBN (Electronic) | 9781538631942 |
| DOIs | |
| Publication status | Published - Jan 19 2018 |
| Event | 2017 IEEE International Conference on Cyborg and Bionic Systems, CBS 2017 - Beijing, China Duration: Oct 17 2017 → Oct 19 2017 |
Publication series
| Name | 2017 IEEE International Conference on Cyborg and Bionic Systems, CBS 2017 |
|---|---|
| Volume | 2018-January |
Other
| Other | 2017 IEEE International Conference on Cyborg and Bionic Systems, CBS 2017 |
|---|---|
| Country | China |
| City | Beijing |
| Period | 10/17/17 → 10/19/17 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Control and Optimization
- Artificial Intelligence
Cite this
Application of redundant-DOF for perception-assist of a lower-limb exoskeleton robot. / Hora, Takahiro; Kiguchi, Kazuo.
2017 IEEE International Conference on Cyborg and Bionic Systems, CBS 2017. Institute of Electrical and Electronics Engineers Inc., 2018. p. 277-281 (2017 IEEE International Conference on Cyborg and Bionic Systems, CBS 2017; Vol. 2018-January).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Application of redundant-DOF for perception-assist of a lower-limb exoskeleton robot
AU - Hora, Takahiro
AU - Kiguchi, Kazuo
PY - 2018/1/19
Y1 - 2018/1/19
N2 - Not only the motor function, but also the sensory function to recognize environments is often deteriorated in elderly persons. Due to the decline of the perception ability, they may encounter accidents such as stumbling. The concept of perception-assist has been proposed to avoid those accidents by automatically modifying their motion using an exoskeleton robot. In perception-assist, the lower-limb exoskeleton tries to modify user's motion automatically for avoiding accidents such as stumbling. The stumbling may be caused by insufficient ankle dorsiflexion as well as lack of lifting up a leg. Therefore, in addition to the motion assist for hip and knee joints, ankle joints also should be assisted to avoid stumbling. Consequently, 3DOF (hip, knee, and ankle joints) motion assist is preferred in each leg in the lower-limb exoskeleton robot, although the minimum degrees of freedom to modify the tip motion of the leg on the sagittal plane is 2DOF. Thus, the power-assist robot with perception-assist has redundant degree of freedom in the user's foot motion modification on the sagittal plane. In the power-assist robot with perception-assist, the redundant degree of freedom can be used to control the modifying motion by utilizing a null space. In this paper, the effective cost function of the null space is proposed for considering the movable range of each user and control of the ankle angle for the robot's energy efficiency. The effectiveness of the proposed cost function was evaluated by conducting experiments.
AB - Not only the motor function, but also the sensory function to recognize environments is often deteriorated in elderly persons. Due to the decline of the perception ability, they may encounter accidents such as stumbling. The concept of perception-assist has been proposed to avoid those accidents by automatically modifying their motion using an exoskeleton robot. In perception-assist, the lower-limb exoskeleton tries to modify user's motion automatically for avoiding accidents such as stumbling. The stumbling may be caused by insufficient ankle dorsiflexion as well as lack of lifting up a leg. Therefore, in addition to the motion assist for hip and knee joints, ankle joints also should be assisted to avoid stumbling. Consequently, 3DOF (hip, knee, and ankle joints) motion assist is preferred in each leg in the lower-limb exoskeleton robot, although the minimum degrees of freedom to modify the tip motion of the leg on the sagittal plane is 2DOF. Thus, the power-assist robot with perception-assist has redundant degree of freedom in the user's foot motion modification on the sagittal plane. In the power-assist robot with perception-assist, the redundant degree of freedom can be used to control the modifying motion by utilizing a null space. In this paper, the effective cost function of the null space is proposed for considering the movable range of each user and control of the ankle angle for the robot's energy efficiency. The effectiveness of the proposed cost function was evaluated by conducting experiments.
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UR - http://www.scopus.com/inward/citedby.url?scp=85050504062&partnerID=8YFLogxK
U2 - 10.1109/CBS.2017.8266115
DO - 10.1109/CBS.2017.8266115
M3 - Conference contribution
AN - SCOPUS:85050504062
T3 - 2017 IEEE International Conference on Cyborg and Bionic Systems, CBS 2017
SP - 277
EP - 281
BT - 2017 IEEE International Conference on Cyborg and Bionic Systems, CBS 2017
PB - Institute of Electrical and Electronics Engineers Inc.
ER -