A new optimization based approach for push recovery in case of multiple noncoplanar contacts

This paper presents a new approach for humanoid push recovery in a generalized noncoplanar multicontact context. Our approach is based on a simplified model and consists in stabilizing the perturbed system while maintaining fixed contacts with the environment or by changing a contact configuration when needed to achieve stabilization. A first step of our strategy chooses the optimal contact to change when needed. A second step stabilizes the system while maintaining fixed contacts, when possible or by calculating the minimum change in the position of the optimal contact, capable of stabilizing the system.