Running model and hopping robot using pelvic movement and leg elasticity

T. Otani, M. Yahara, K. Uryu, A. Iizuka, K. Hashimoto, T. Kishi, N. Endo, M. Sakaguchi, Y. Kawakami, S. H. Hyon, H. O. Lim, A. Takanishi

Research output: Contribution to journalConference articlepeer-review

4 Citations (Scopus)


Human running motion can be modeled by a spring loaded inverted pendulum (SLIP). However, this model, despite being widely used in robotics, does not include human-like pelvic motion. In this study, we show that the pelvis actually contributes to the increase in jumping force and absorption of landing impact, both of which findings can be used to improve running robots. On the basis of the analysis of human running motion, we propose a new model named SLIP2 (spring loaded inverted pendulum using pelvis). This model is composed of a body mass, a pelvis, and leg springs; the model can control its springs during running by use of pelvic movement in the frontal plane. To achieve hopping and running motions, we developed pelvis oscillation control, running velocity control, and stabilization control using an upper body, as control methods. We also developed a new hopping robot using the SLIP2 model. To evaluate the proposed model and control methods, we performed hopping and running simulations. The simulation results showed that the SLIP2 model successfully achieves hopping and running motions. The hopping robot was also able to accomplish hopping motion. The simulation results also showed that the difference between the pelvic rotational phase and the phase of oscillation of the mass vertical displacement affects the jumping force. In particular, the results revealed that the human-like pelvic rotation contributes to the absorption of landing impact and to the increase in takeoff forces, which validates our observations in human motion analysis.

Original languageEnglish
Article number6907179
Pages (from-to)2313-2318
Number of pages6
JournalProceedings - IEEE International Conference on Robotics and Automation
Publication statusPublished - 2014 Sep 22
Event2014 IEEE International Conference on Robotics and Automation, ICRA 2014 - Hong Kong, China
Duration: 2014 May 312014 Jun 7

ASJC Scopus subject areas

  • Software
  • Control and Systems Engineering
  • Artificial Intelligence
  • Electrical and Electronic Engineering


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