Periodic spring-mass running over uneven terrain through feedforward control of landing conditions.

Abstract:

:This work pursues a feedforward control algorithm for high-speed legged locomotion over uneven terrain. Being able to rapidly negotiate uneven terrain without visual or a priori information about the terrain will allow legged systems to be used in time-critical applications and alongside fast-moving humans or vehicles. The algorithm is shown here implemented on a spring-loaded inverted pendulum model in simulation, and can be configured to approach fixed running height over uneven terrain or self-stable terrain following. Offline search identifies unique landing conditions that achieve a desired apex height with a constant stride period over varying ground levels. Because the time between the apex and touchdown events is directly related to ground height, the landing conditions can be computed in real time as continuous functions of this falling time. Enforcing a constant stride period reduces the need for inertial sensing of the apex event, which is nontrivial for physical systems, and allows for clocked feedfoward control of the swing leg.

journal_name

Bioinspir Biomim

authors

Palmer LR 3rd,Eaton CE

doi

10.1088/1748-3182/9/3/036018

subject

Has Abstract

pub_date

2014-09-01 00:00:00

pages

036018

issue

3

eissn

1748-3182

issn

1748-3190

journal_volume

9

pub_type

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