Faces of android robots are one of the most important interfaces to communicate with
humans quickly and effectively, as they need to match the expressive capabilities of the
human face, it is no wonder that they are complex mechanical systems containing inevitable
non-linear and hysteresis elements derived from their non-rigid components. Identifying the
input-output response properties of this complex system is necessary to design surface
deformations accurately and precisely. However, to date, android faces have been used�…