2019_programme: TRANSMISSION PATTERN OPTIMIZATION MODEL FOR CONFORMAL CONTOUR DESIGN

• Session: 16. Advances in acoustic measurement systems: Technologies and applications
  Organiser(s): Tesei Alessandra
• Lecture: TRANSMISSION PATTERN OPTIMIZATION MODEL FOR CONFORMAL CONTOUR DESIGN
  Paper ID: 812
  Author(s): Zimmer Christoph, Theuerkauf Nils, Kraus Dieter , Kummert Anton
  Presenter: Zimmer Christoph
  Presentation type: oral
  Abstract: To achieve desired transmission or reception characteristics either optimized amplitude and phase shadings are assigned to each transducer of a linear array or a conformal transducer placement is applied avoiding the necessity of separated- and individually driven channels. For higher frequency applications a desired characteristic can also be obtained by conformal shaping of a single transducer. \nIn order to design a conformal transducer with differing horizontal and vertical requirements and a large bandwidth a three-dimensional contour needs to be optimized using numerical optimization techniques. To avoid manufacturing and curvature constraints the resulting contour is milled onto a single composite ceramic stack which also results in the ceramics polarization direction being no longer orthogonal to the conformal surface. To model the resulting acoustical behavior at moderate complexity we chose to adapt a discrete source model by attaching an inherent element characteristic which is differing for each source as a result of the local gradient for the surface contour. Our approach is to apply a linear combination of two characteristics- one along the main vibration direction and hence in main direction of the ceramic and the second orthogonal on the conformal surface to obtain a realistic overall result. These characteristics are acquired based on exemplary FEM simulations using simplified two-dimensional setups for a limited set of sloping angles.\nThe optimization results are verified by measurements obtained with two differing transducers manufactured using the optimized contours. With only minor deviations from the simulation results we present a promising method for conformal contour optimization which can also be applied easily to other applications, element sizes or desired transmission characteristics if required.\n
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• Corresponding author: Mr Zimmer Christoph
  Affiliation: Bergische Universität Wuppertal
  Country: Germany
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