|A Stable Gait Planning Method of Biped Robot Based on Ankle Motion Smooth Fitting
Dong En Zeng, Wang Dan Dan, Tong Ji Gang*, Chen Chao*, and Wang Zeng Hui
International Journal of Control, Automation, and Systems, vol. 16, no. 1, pp.284-294, 2018
Abstract : "In ankle joint trajectory planning of biped robots, the spline interpolation generally leads to acceleration
mutations on the key points, which weakens the stability of the biped robot. To solve this problem, a smooth
function fitting method on ankle joint trajectory planning is proposed in this paper. In this method, the higher order
derivatives of the ankle joint trajectory is smooth, and the acceleration mutation can be avoided. The biped robot
gait planning of a whole cycle is accomplished by calculating the joint angle sequences of hip, knee and ankle.
The effectiveness of the proposed method is demonstrated by numerical simulations on NAO robot gait planning.
Experimental results show that the proposed method can improve the stability of the zero moment point (ZMP)
margin effectively when it is applied to the bipedal robot gait planning on the non-horizontal ground."
Ankle joint, biped robot, gait planning, smooth function fitting, zero moment point.