Nartov F.A., Williams R.P., Khokhlova V.A. «Electronic Focus Steering Capabilities of a Diagnostic-Type Linear Ultrasound Array Designed for High Power Therapy and Its Visualization» Acoustical Physics, 70, № 1, с. 165-174 (2024)

The focus steering capabilities of a 1 MHz linear phased array transducer (64 rectangular elements, 14.8×51.2 mm aperture) intended for drug delivery applications in abdominal organs were assessed and compared with its design-stage computer model. Acoustic fields generated by the transducer and predicted by the models of an ideal array with uniformly vibrating elements and either a plane or a cylindrically focused surface were simulated using the Rayleigh integral and angular spectrum methods. The boundary conditions for the transducer were reconstructed from acoustic holography measurements performed for selected focusing configurations of the array and also synthesized from holography data measured for each of its individual elements. It was shown that the transducer field with electronic focus steering can be accurately synthesized based on the holography data of its elements, which significantly simplified acoustic field characterization. Variability of the power and directivity patterns of the array elements were analyzed. A twofold smaller range of electronic steering in the transverse direction for the transducer compared to its computer model is discussed.

Vjuginova A., Vjuginov S.N., Novik A.A. «Simulation of Ultrasonic Tools for Cutting Honeycomb Panels Made of Aluminum and Aramid (Kevlar)» Acoustical Physics, 70, № 1, с. 189-193 (2024)

Honeycomb panels made of aluminum and composite materials aramid, or Kevlar–are widely used in aviation, space, automotive, and other fields due to their unique characteristics: high strength and rigidity, low density, and good thermal insulation properties. However, the mechanical processing of products made of honeycomb materials faces several difficulties, and one of the technologies that effectively solves the problems of cutting products made of honeycomb materials is ultrasonic cutting. In this paper, the finite element method is used to study the frequency properties necessary for designing tools for ultrasonic cutting of products made of honeycomb materials with operating frequencies around 20 kHz and various geometric parameters for cutting different variants of honeycomb constructions. The results of analyzing the wave dimensions of specialized ultrasonic triangular and disk-type instruments depending on geometry features are shown, along with the experimental results for a number of developed variants.