A nonlinear rheological model for the ultrasonically induced squeeze film effect in variable friction haptic displays
A nonlinear rheological model for the ultrasonically induced squeeze film effect in variable friction haptic displays
复制标题
可变摩擦力触觉显示器中超声引起的挤压膜效应的非线性流变模型
DOI：
10.1007/s13367-017-0023-1
复制
发表时间：
2017
影响因子：
1.3
通讯作者：
K. Son
中科院分区：
文献类型：
--
作者：
K. Son
超声振动在接触固体表面上形成的挤压膜可以显著地减小摩擦。这种现象，即所谓的挤压膜效应，已经在可变摩擦触觉显示器中用于纹理渲染目的。这样的触觉显示器可以以可控的方式向指垫激发触觉感觉。可以通过调制触觉面板的振动幅度来实现人的指垫和触觉显示器之间的横向摩擦系数的实时调节。因此，驱动可靠的摩擦模型是设计和控制利用挤压膜效应的触觉显示器的关键步骤。本文推导了一个修正的Herschel-Bulkley流变模型，将空气挤压膜施加在人指尖上的横向摩擦力表示为驱动电压幅值、手指滑动速度和接触压力等操作参数的函数。与传统的库仑摩擦模型相比，这种流变模型可以解释滑动速度的依赖性。这一建模工作可能有助于超声可变摩擦触觉显示器的最优控制。
A squeeze film induced by ultrasonic vibration between two solid surfaces in contact can dramatically reduce the friction between them. This phenomenon, so-called the squeeze film effect, has been utilized in variable friction tactile displays for texture rendering purposes. Such tactile displays can provoke a haptic sensation to a finger pad in a controllable way. A real-time adjustment of the coefficient of lateral friction between the human finger pad and the tactile display can be accomplished by modulating the vibration amplitude of the tactile panel. Therefore, driving a reliable friction model is a key step towards designing and controlling tactile displays utilizing the squeeze film effect. This paper derives a modified Herschel- Bulkley rheological model to express the lateral friction exerted on a human fingertip via an air squeeze film as a function of the operating parameters such as the driving voltage amplitude, the finger sliding speed, and the contact pressure. In contrast to the conventional Coulomb friction model, such a rheology model can account for the sliding velocity dependence. This modeling work may contribute to the optimal control of the ultrasonic variable friction tactile displays.