Smart electromeehanical systems consist mainly of sensors, actuators, and d
ata processing units. Actuators are the responding units of many smart syst
ems including those for active vibration control and noise control. Increas
ed demand for actuators with high-displacement, high generative force, and
quick-response time has led to a search for new actuator materials and new
designs. The performance of traditional piezoelectric transducers with newl
y designed flextensional transducers is compared.