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Error Analysis and Effective Adjustment of the Walking-Ready Posture for a Biped Humanoid Robot

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A walking control algorithm is generally a mixture of various controllers; it depends on the characteristics of the target system. Simply adopting one part of another researcher's algorithm does not guarantee an improvement in walking performance. However, this paper proposes an effective algorithm that can be easily adopted to other biped humanoid robots; the algorithm enhances the walking performance and stability of the robot merely by adjusting the walking-ready posture. The walking performance of biped humanoid robots is easily affected by an unsuitable walking-ready posture in terms of accuracy and repeatability. More specifically, low accuracy for the walking-ready posture may cause a large difference between an actual biped robot and its mathematical model, and the low repeatability may disturb the evaluation of the performances of balance controllers. Therefore, this paper first discusses the factors that detrimentally affect bipedal walking performance and their phenomena in the walking-ready posture. The necessary conditions for an ideal walking-ready posture are then defined based on static equilibrium and a suitable adjustment algorithm is proposed. Finally, the effectiveness of the algorithm is verified through dynamic computer simulations.
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Document Type: Research Article

Affiliations: 1: Humanoid Robot Laboratory, School of Mechanical Design and Automation Engineering, Seoul National University of Science & Technology, Gongrung-Dong, Nowon-Gu, Seoul 139-743, South Korea 2: Construction Robot and Automation Laboratory, Department of Civil and Environmental Engineering, Yonsei University, 134, Shinchon-dong, Seodaemun-gu, Seoul 120-749, South Korea

Publication date: 2010-11-01

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