Liu Yuanyuan, Eser Martin, Sun Xiaodong, Sepahvand Kian K, Marburg Steffen
Chair of Vibroacoustics of Vehicles and Machines, Technical University of Munich, Boltzmann Strasse 15, 85748 Garching, Germany.
J Acoust Soc Am. 2021 Sep;150(3):1682. doi: 10.1121/10.0006208.
Contactless transportation systems based on near-field acoustic levitation have the benefit of compact design and easy control which are able to meet the cleanliness and precision demands required in precision manufacturing. However, the problems involved in contactless positioning and transporting cylindrical objects have not yet been addressed. This paper introduces a contactless transportation system for cylindrical objects based on grooved radiators. A groove on the concave surface of the radiator produces an asymmetrical pressure distribution which results in a thrusting force to drive the levitator horizontal movement. The pressure distribution between the levitator and the radiator is acquired by solving the Reynolds equation. The levitation and the thrusting forces are obtained by integrating the pressure and the pressure gradient over the concave surface, respectively. The predicted results of the levitation force agree well with experimental observations from the literature. Parameter studies show that the thrusting force increases and converges to a stable value as the groove depth increases. An optimal value for the groove arc length is found to maximize the thrusting force, and the thrusting force increases as the groove width, the radiator vibration amplitude, and the levitator weight increase.
基于近场声悬浮的非接触式运输系统具有设计紧凑、易于控制的优点，能够满足精密制造所需的清洁度和精度要求。然而，非接触式定位和运输圆柱形物体所涉及的问题尚未得到解决。本文介绍了一种基于带槽散热器的圆柱形物体非接触式运输系统。散热器凹面上的凹槽产生不对称的压力分布，从而产生推力以驱动悬浮器水平移动。通过求解雷诺方程获得悬浮器与散热器之间的压力分布。分别通过在凹面上对压力和压力梯度进行积分来获得悬浮力和推力。悬浮力的预测结果与文献中的实验观测结果吻合良好。参数研究表明，随着凹槽深度的增加，推力增大并收敛到一个稳定值。发现凹槽弧长的一个最佳值可使推力最大化，并且推力随着凹槽宽度、散热器振动幅度和悬浮器重量的增加而增大。
