Biet Mélisande, Giraud Frédéric, Lemaire-Semail Betty
University of Lille, L2EP, Villeneuve D'Ascq, France.
IEEE Trans Ultrason Ferroelectr Freq Control. 2007 Dec;54(12):2678-88. doi: 10.1109/TUFFC.2007.596.
Most tactile displays currently built rely on pin-based arrays. However, this kind of tactile device is not always appropriate when we need to give the illusion of finely textured surfaces. In this paper, we describe the squeeze film effect between a plate and a finger, and we use this effect to design an ultrasonic tactile plate. The plate is actuated by piezoelectric ceramics. Ultrasonic vibrations are thus produced and are capable of generating the squeeze film effect. This enables us to simulate variable friction on the surface of the plate. In order to identify the squeeze film phenomenon, this study considers the case where a finger, with a planar bottom surface and with epidermal ridges, is placed on a rapidly vibrating plate. The overpressure is calculated and the result enables us to assess the relative coefficient of friction as a function of the vibration amplitude of the plate. Based on this principle, and using both analytic and FE method studies, and given ergonomic and stimulation (squeeze film) requirements, we show that it is possible to design a tactile plate which is capable of giving programmable tactile sensations. We conclude by comparing the results obtained from our simulations with experimental results.
目前制造的大多数触觉显示器都依赖基于引脚的阵列。然而，当我们需要营造出纹理细腻的表面的错觉时，这种触觉设备并不总是适用的。在本文中，我们描述了平板与手指之间的挤压薄膜效应，并利用这种效应设计了一种超声波触觉平板。该平板由压电陶瓷驱动。由此产生超声波振动，并且能够产生挤压薄膜效应。这使我们能够模拟平板表面的可变摩擦力。为了识别挤压薄膜现象，本研究考虑了将具有平坦底面和表皮纹路的手指放在快速振动的平板上的情况。计算了超压，结果使我们能够评估作为平板振动幅度函数的相对摩擦系数。基于这一原理，并使用解析法和有限元法研究，同时考虑人体工程学和刺激（挤压薄膜）要求，我们表明有可能设计出一种能够提供可编程触觉感受的触觉平板。我们通过将模拟结果与实验结果进行比较来得出结论。
