Method for controlling {HEAD ~ a piezoelectric actuator} which is used to displace {TAIL ~ an element} 
is used to displace
Method for controlling { HEAD ~ a piezoelectric actuator } which is used to displace { TAIL ~ an element }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL