“…for decades with many criteria proposed to measure the stability margin of a mobile system, for example, center of gravity, static stability margin, zero moment point (ZMP), longitudinal stability margin [16], dynamic stability margin [17], tumble stability judgment [18], leg-end supporting moment [19], force-angle stability (FA) [20], foot-rotation indicator (FRI) [21], moment-height stability [22], stability pyramid, and tip-over moment (TOM) [13,23,24]. With these criteria, several path planning and guidance control methods were proposed.…”