<p>Organisms in nature have evolved compliant bodies that enable remarkable locomotion across diverse environments. Such compliant body structures can also contribute to functional differentiation among body segments. Recently, quadruped robots have leveraged biological compliance to achieve efficient and natural locomotion. However, many studies on compliant quadruped robots still adopt symmetric fore–hind actuation assumptions, potentially overlooking the distinct functional roles of fore- and hind-limbs. To examine this issue, this study uses a simplified quadruped walker model with a compliant torso and numerical simulations to investigate how fore and hind torque allocation affects walking performance. The results indicate that, within the proposed simplified model and tested parameter ranges, hind-limb-dominant torque allocation produces broader regions of feasible and stable walking gaits than fore-limb dominant and combined torque allocation. These findings provide mechanistic insight into how torso compliance can shape the effects of asymmetric power distribution and offer a testable hypothesis for future studies on compliant quadruped locomotion.</p>

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Asymmetric power distribution highlights hind-limb-dominant drive advantages in a simplified quadruped walker with a compliant torso

  • Yuxuan Xiang,
  • Yanqiu Zheng,
  • Fumihiko Asano

摘要

Organisms in nature have evolved compliant bodies that enable remarkable locomotion across diverse environments. Such compliant body structures can also contribute to functional differentiation among body segments. Recently, quadruped robots have leveraged biological compliance to achieve efficient and natural locomotion. However, many studies on compliant quadruped robots still adopt symmetric fore–hind actuation assumptions, potentially overlooking the distinct functional roles of fore- and hind-limbs. To examine this issue, this study uses a simplified quadruped walker model with a compliant torso and numerical simulations to investigate how fore and hind torque allocation affects walking performance. The results indicate that, within the proposed simplified model and tested parameter ranges, hind-limb-dominant torque allocation produces broader regions of feasible and stable walking gaits than fore-limb dominant and combined torque allocation. These findings provide mechanistic insight into how torso compliance can shape the effects of asymmetric power distribution and offer a testable hypothesis for future studies on compliant quadruped locomotion.