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Stability analysis of the zero moment point-center of pressure algorithm for biped robots in unstructured
Chengguang Zhang1,2, Jixiang Li3, He Zhang4
1School of Mechanical and Electrical Engineering, Zhoukou Normal University, Zhoukou, 466001, China. zhangchengguang@126.com.
None:
The motion stability control of biped robots in unstructured environments is a prominent research hotspot in the field of robot control. The biped robot model features variable topology, strong nonlinearity, and multi-degree-of-freedom coupling, allowing for strong environmental interaction. The unstructured road environment imposes more significant requirements on the robot's gait stability, joint coordination, and adaptability to its environment. In this study, a stability analysis of the motion of robots in unstructured environments was carried out using a disturbance balance control strategy and an application based on Zero Moment Point (ZMP)-Center of Pressure (CoP) testing for feedback control. The approach included a control strategy based on compensating for ankle joint trajectory and was tested using the Webots simulation platform and a real experimental platform. Multi-scene experiments involving NAO robots on stairs and in unstructured sandy environments were conducted to compare and analyze the gait stability and environmental adaptability of NAO robots in unstructured environments.
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