On the periodic gait stability of a multi-actuated spring-mass hopper model via partial feedback linearization

Date
2017
Authors
Hamzaçebi, H.
Morgül, Ö.
Editor(s)
Advisor
Supervisor
Co-Advisor
Co-Supervisor
Instructor
Source Title
Nonlinear Dynamics
Print ISSN
0924-090X
Electronic ISSN
Publisher
Springer Netherlands
Volume
88
Issue
2
Pages
1237 - 1256
Language
English
Journal Title
Journal ISSN
Volume Title
Series
Abstract

Spring-loaded inverted pendulum (SLIP) template (and its various derivatives) could be considered as the mostly used and widely accepted models for describing legged locomotion. Despite their simple nature, as being a simple spring-mass model in dynamics perspective, the SLIP model and its derivatives are formulated as restricted three-body problem, whose non-integrability has been proved long before. Thus, researchers proceed with approximate analytical solutions or use partial feedback linearization when numerical integration is not preferred in their analysis. The key contributions of this paper can be divided into two parts. First, we propose a dissipative SLIP model, which we call as multi-actuated dissipative SLIP (MD-SLIP), with two extended actuators: one linear actuator attached serially to the leg spring and one rotary actuator attached to hip. The second contribution of this paper is a partial feedback linearization strategy by which we can cancel some nonlinear dynamics of the proposed model and obtain exact analytical solution for the equations of motion. This allows us to investigate stability characteristics of the hopping gait obtained from the MD-SLIP model. We illustrate the applicability of our solutions with open-loop and closed-loop hopping performances on rough terrain simulations. © 2017, Springer Science+Business Media Dordrecht.

Course
Other identifiers
Book Title
Citation
Published Version (Please cite this version)