Electromechanical equivalent circuit diagram

Fig. 6.130. Electromechanical equivalent circuit diagram and amplitude responses of actuator and sensor transfer characteristic in small signal operation...

The interpretation of (6.44), (6.45), (6.46) and (6.47) is illustrated in Fig. 6.130, showing an electromechanical equivalent circuit diagram. Accordingly, the input of a piezoelectric transducer can be considered as an electrical capacitor with the capacitance C and its output as a mechanical spring with the stiffness cp. As in reality C is always lossy and cp has always a mass and a structural damping behaviour, the amplitude response IV /Fgl of the piezoelectric transducer has a definite lower cut-off frequency /u and a mechanically determined natural frequency /o for an open electrical port (Jg = 0), and the amplitude response s/V has a mechanically determined natural frequency /o for an open mechanical port F = 0). 

The description of the transfer characteristic of solid-state actuators can be generalised if the system equations which have been introduced in Sect. 6.9.2 are not interpreted as electromechanical equivalent circuit diagrams but as signal flow charts [335]. The result is shown in Fig. 6.134. 

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See also in sourсe #XX -- [ , , , ]

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