In a motion effector for use in a virtual reality system, a plant is a target of control and for producing an output signal reflecting the actual movement of a moving part therein and a reference input provider provides a reference input signal which reflects {HEAD ~ a desired motion} of {TAIL ~ the plant} 
In a motion effector for use in a virtual reality system , a plant is a target of control and for producing an output signal reflecting the actual movement of a moving part therein and a reference input provider provides a reference input signal which reflects { HEAD ~ a desired motion } of { TAIL ~ the plant }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL