Piezoelectric transducer with resonant modes control for parametric speaker

Piezoelectric Transducer Modeling: with System Identification (SI) Method

System identification is the process of creating models of dynamic process from inputoutput signals. The aim of system identification can be identified as “ to find a model with adjustable parameters and then to adjust them so that the predicted output matches the measured output”. This paper presents a method of modeling and simulating with system identification to achieve the maximum fitness ...

Micromachined piezoelectric ultrasonic transducer with ultra-wide frequency bandwidth

Aluminum Nitride Piezoelectric Micromachined Ultrasound Transducer Arrays

Air-coupled piezoelectric micromachined ultrasound transducer arrays, operating at ~190 kHz, have been fabricated utilizing an aluminum nitride piezoelectric layer. Improved fabrication processes have reduced the frequency variation seen in our previous work with single transducers resulting in arrays of transducers with resonant frequencies (fn) that match within the fractional half-power band...

Triple resonant states and chaos control in an electrostatic transducer with two outputs

The dynamics of a non-linear electrostatic transducer with two outputs is studied. The amplitudes and stability conditions of oscillations for the Triple Resonant States are obtained and discussed. It is found that chaos can appear in the system. A retroactive control strategy is therefore applied to tune these chaotic oscillations to regular target orbits. The stability analysis of the feedbac...

1-3 Piezoelectric Composites for High Power Ultrasonic Transducer Applications

In this paper, we demonstrated that 1-3 PZT/polymer composites, fabricated using PZT-4 ceramic and a polymer possessing a high glass transition temperature and low loss, can be used as high power ultrasonic transducer materials for high intensity focused ultrasound (HIFU) applications. The mechanical quality factor of the 1-3 composite with 64% ceramic volume fraction is over 200. The dielectri...