Download e-book for iPad: Adaptive Structural Systems with Piezoelectric Transducer by Kon-Well Wang, Jiong Tang

By Kon-Well Wang, Jiong Tang

Adaptive Structural structures with Piezoelectric Transducer Circuitry presents a accomplished dialogue at the integration of piezoelectric transducers with electric circuitry for the advance and enhancement of adaptive structural platforms. protecting a variety of interdisciplinary study, this monograph provides a paradigm of taking complete good thing about the two-way electro-mechanical coupling features of piezoelectric transducers for structural keep an eye on and identity in adaptive structural platforms. offering descriptions of set of rules improvement, theoretical research and experimental research, engineers and researchers alike will locate this a helpful reference.

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The primary limitation on the negative capacitance in the experiment is the current that the op-amp can sustain, which, for this specific operational amplifier, should be kept below 5mA. One may achieve larger negative capacitance by using higher current opamps. The short circuit frequency response with the negative capacitance is also shown in Fig. 3207 . It should be noted that the short circuit status with negative capacitance refers to the situation that the positive electrode of the piezoelectric transducer is grounded.

7. 1; At zero frequency, the voltage ratio is unity, because the circuitry elements have no effect for static input and the voltage across the piezoelectric transducer is the same as the input voltage. 1 , exhibits a more than 600% increase. Above the circuit resonant frequency, the voltage ratio has a significant roll-off. The reason is that the inertia effect of the inductor tends to block the voltage input from the power source at high frequencies. For broadband control this would help prevent spillover (Meirovitch, 1990) since the high frequency components of the control voltage will be cut off in a manner similar to adding a low pass filter.

Such negative capacitance cannot be realized passively, and one needs to use an op-amp to form a negative impedance converter circuit (Horowitz and Hill, 1989), which requires a power source. However, the power consumption is normally very low and can be easily compensated as explained in the following. In many applications the piezoelectric capacitance is quite small, which leads to large k2. Therefore, oftentimes the optimal passive tuning criterion requires large inductance. , 1992). The negative capacitance increases the overall capacitance value of the piezoelectric circuitry, and directly reduces the required optimal inductance value.

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