“…This kind of system has been implemented to emulate the behaviour of biological systems [ 30 , 31 , 32 ]. It must be pointed out that this kind of mechanism is highly valuable when some kinds of transmission mechanisms are applied, such as a driven cable [ 33 , 34 ], or when a special class of smart actuator is implemented such as the shape memory alloys [ 27 , 35 , 36 ], pneumatic actuators [ 37 , 38 ], and electro-chemical actuators [ 39 , 40 ].…”