Numerical modeling of a flexural displacement-converter mechanism to excite a flat acoustic source driven by piezoelectric stack actuators

Energy-efficient low-frequence flat acoustic source

“…At low frequencies (between 20 Hz and 1000 Hz), a limited active power is available to the acoustic sources. The reason is that a major portion of the supplied power is stored in reactive elements of the acoustic sources [44]. If an appropriate amplifier unit is present, the stored reactive power has the capability of being reused.…”

“…An analytical study in Fig. 6 reveals the amount of energy flow in an arbitrary acoustic source [44]. In this study, it is assumed that the acoustic source is excited by a piezoelectric actuator that is connected to class AB and class D amplifiers.…”

“…In this study, it is assumed that the acoustic source is excited by a piezoelectric actuator that is connected to class AB and class D amplifiers. Figure 6 is obtained at the fundamental resonance frequency of the source [44]. The reason is that the maximum power flow in the acoustic source occurs at the resonance.…”

“…To verify the analytical approach, in the remainder of this paper, a small sample of a thin acoustic source, which is used in Ref. [22,44], is investigated.…”

“…A motionconverter auxiliary mechanism is used in combination with the piezoelectric actuator in the measurement (see Ref. [53]). The stiffness of the added auxiliary mechanism affects the overall stiffness of the actuation unit and the associated resonance frequencies.…”