Contribution
Investigation of the influence of solution-dependent effects on ultrasound pulse-based sound generation principles
* Presenting author
Abstract:
Ultrasound pulse-based sound generation principles like Advanced Digital Sound Reconstruction (ADSR) require fast-moving actuators operating on the micrometer scale. In this contribution, we investigate the influence of solution-dependent effects on the sound generation process of a unit cell for ADSR, which consists of a sound generation unit (loudspeaker) encased by two shutter gates. For the numerical investigation, we solve the linearized compressible flow equations on moving domains coupled to structural mechanics and acoustics within a finite element context. The investigated solution-dependent effects include slip boundary conditions and pressure-dependent shutter movements caused by finite mounting stiffness. Depending on geometric parameters, the sensitivity to such effects as well as the performance can vary significantly. Using a parameter study, we characterize the sensitivity and evaluate the total harmonic distortion (THD), which serves as guidance for real-life applications. Based on the parameter study, we explore optimal configurations in order to minimize the THD while retaining the manufacturability of the device.