Large vibrating plates are used as thunder sheets in orchestras. We have extended the use of flat plates by cementing a flat panel electroacoustic transducer on a large brass sheet. Because of the thickness of the panel, the output is subject to nonlinear distortion. When combined with a real-time input and signal processing algorithm, the active brass plate can become an effective musical inst...

In this paper, the underlying concept of acoustic liner is an electroacoustic transducer which acoustic impedance can be changed by electrical means, be it passive or active. Among the different ways to obtain variable acoustic properties on an electroacoustic transducer's voicing face is the shunting of the transducer's electrical input. With such shunt devices, the acoustic impedance that the...

The object of research: the shift resonant frequency piezoceramic electroacoustic transducer Langevin type depending on shape back plate.
 Investigated problem: relationship between changes in plate with oscillating system. Search quantitative contribution to each modifications: shape, diameter, thickness, weight main scientific results: vibration modes a horizontal and vertical radiator r...

The input electrical impedance behaves as a capacitive when a piezoelectric transducer is excited near its resonance frequency. In order to increase the energy transmission efficiency, a series or parallel inductor should be used to compensate the capacitive impedance of the piezoelectric transducer. In this paper, the effect of the series matching inductor on the electromechanical characterist...

In the application of Structural Health Monitoring (SHM) methods and related technologies, transducer used for electroacoustic conversion has gradually become a key component SHM systems because its unique function transmitting structural safety information. By comparing analyzing health large-scale structures, theories based on ultrasonic guided waves are studied. The technologies research sta...

In underwater environment the acoustical wave can transmit a long ranges away from the transmitter than the electromagnetic wave does. So far, the piezoelectric ceramic is still the best candidate as acoustical telemetry transmitters in underwater applications. The impedance matching on the interface between electro-acoustical transducer and electrical transmitter has been the most important su...

Unresectable liver tumors are often treated with interstitial probes that modify tissue temperature, and efficacious treatment relies on image guidance for tissue targeting and assessment. Here, we report the in vivo evaluation of an interstitial applicator with a mechanically oscillating five-element dual-mode transducer. After thoroughly characterizing the transducer, tissue response to high-...

Direct impedance control (DIC) technique used for an electroacoustic absorber in this paper requires a pair of pressure and velocity sensor. However, it can be quite costly to develop array system of this electrostatic absorber for acoustically large space. To overcome this problem, in this paper instead of using velocity sensor, disturbance-observer-type velocity estimator is applied to DIC te...

The active sound navigation and ranging (SONAR) transmission system emits acoustic pulses underwater using a wave generator, SONAR power amplifier (SPA), projector. pulse travel in the direction of target return as an echo to hydrophone learn range or speed object. Often same device is used projector; this context, it known transducer. In order obtain maximum detection SONAR, desirable generate...