Andersson Carl
Division of Applied Acoustics, Chalmers University of Technology, 412 96 Gothenburg, Sweden.
J Acoust Soc Am. 2022 May;151(5):2999. doi: 10.1121/10.0010358.
Recently, acoustic levitation of a wavelength-sized spherical object using a general-purpose ultrasonic transducer array was demonstrated. In this article, the possibility of extending the capabilities of such arrays to levitate multi-wavelength-sized objects is explored. The driving signals for the elements in the array are determined via numerical optimization of a physics-based cost function that includes components for trap stabilization. The cost function is balanced with an improved approach, mimicking dynamical de-weighting of the included components to avoid over-optimization of each individual component. Sound fields are designed and analyzed for levitation of objects with diameters up to 50 mm for various general-purpose simulated array configurations. For a 16 × 16 element transducer array, simulations predict levitation of spheres with diameters up to 20 mm (2.3 wavelengths), which is verified experimentally.
最近，利用通用超声换能器阵列实现了波长尺寸球形物体的声悬浮。在本文中，探讨了扩展此类阵列能力以悬浮多波长尺寸物体的可能性。通过基于物理的成本函数的数值优化来确定阵列中各元件的驱动信号，该成本函数包括用于阱稳定的组件。采用一种改进方法使成本函数达到平衡，模拟所包含组件的动态加权以避免对每个单独组件的过度优化。针对各种通用模拟阵列配置，设计并分析了用于悬浮直径达50毫米物体的声场。对于一个16×16元件的换能器阵列，模拟预测直径达20毫米（2.3个波长）的球体可实现悬浮，这已通过实验验证。
