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In this paper, a strides detection algorithm is proposed using inertial sensors worn on the ankle. This innovative approach based on geometric patterns can detect both normal walking strides and atypical strides such as small steps, side steps and backward walking that existing methods struggle to detect. It is also robust in critical situations, when for example the wearer is sitting and moving the...
While a number of controllers exist for dynamic humanoid walking over known uneven terrain, the ability to negotiate moderate changes in ground height without environment perception is still lacking. Such capability would mitigate problems caused by inaccurate sensing and reduce online terrain-dependent computational requirements. This letter proposes a 1-step terrain adaptation strategy for humanoid...
Many studies show the effectiveness of gait in surveillance and access control scenarios. However, appearance changes due to walking direction changes impose a challenge for gait recognition techniques that assume people only walk in a straight line. In this paper, the effect of walking along straight and curved path is studied by proposing a practical technique which is based on the three key frames...
This paper presents a control scheme for ensuring that a 3D, under-actuated, point-foot biped robot remains balanced while walking. It achieves this by observing the center of mass (COM) position error relative to a reference path and re-planning a new reference trajectory to remove this error at every step. The Prismatic Inverted Pendulum Model (PIPM) is used to simplify behavioral analysis of the...
Uneven terrain walking is one of the important premises for biped robots to serve people. However, it is one of the key challenges for biped robots walking on a slope. In this paper, a universal method to generate patterns for biped robot walking on a three-dimensional (3D) slope is proposed. Different from most researches, which only focused on the specific walking directions on a slope as across...
Humanoid robots have many potential applications in man-made environments, including performing hazardous tasks, assisting the elderly, and as a replacement for our aging workforce. However, generating a reliable gait for biped robots is challenging, particularly for dynamic gait and in the presence of unknown external disturbances, such as a bump from someone walking by. In this work, a 3D formulation...
This paper proposes a trajectory generation and control strategy for generating stable gait subject to unknown disturbances, based on the concept of the Foot Placement Estimator (FPE). While most walking control strategies in the field of bipedal locomotion aim to constantly maintain balance, the Foot Placement Estimator (FPE) estimates where the foot must be placed in order to restore balance. One...
Maneuvering through 3D structures nimbly is pivotal to the advancement of legged locomotion. However, few methods have been developed that can generate 3D gaits in those terrains and fewer if none can be generalized to control dynamic maneuvers. In this study, foot placement planning for dynamic locomotion traversing irregular terrains is explored in three dimensional space. Given boundary values...
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