Topology optimization of the element connections in transducer arrays

摘要

Cross-talk in transducer arrays is an important issue that affects the array performance. For therapeutic arrays and other arrays that are driven in continuous wave (CW) mode, the cross-talk between array elements reduce the acoustic power output and array directivity. This paper is devoted to the minimization of the cross-talk in air-backed arrays by optimizing the inter-element connections in the kerf. The kerf region is the design domain and the induced electric voltage on the pasive element at a given operating frequency is the objective function. A density-based topology optimization problem is formulated and solved using the sequential linar programming (SLP). Preliminary optimization results for three-element array are presented. The effectiveness of the design with respect to the cross-talk, far-field pressure level and directivity is discussed.