Modal Superimposition for Multi-fingers Variable Friction Tactile Device

Abstract

International audienceIn this study, we develop and implement a method for superimposing two vibration modes in order to produce different tactile stimuli on two fingers located in different positions. The tactile stimulation is based on the squeeze film effect which decreases the friction between a fingertip and a vibrating plate. Experimental test have been conducted on a 1D tactile device. They show that it is possible to continuously control the friction on two fingers moving independently. Then, we developed the design of a 2D device based on the same principle, which gives rise to the design of a two-fingers tactile display. Evaluations were conducted using a modal analysis with experimental validation

Control and evaluation of a 2-D multimodal controlled-friction display

“…The actuation of the two modes is obtained with 4 piezoelectric patches (NOLIAC, Denmark) which are placed at the four corners of the plate, according to the procedure already described in [10]. The voltage applied on each patch is named v A , v B , v C and v D respectively.…”

“…The authors presented 4 different tactile maps, but they also point out that the method has the disadvantage to produce audible christophe.giraud-audine@ensam.eu noise by principle. In [9], [10], we presented a multimodal approach which allows a programmable tactile stimulation on two fingers located on two independent positions, on a 1D device. It consists in using two vibration modes which are energized at the same frequency, and which are superimposed in order to control the vibration amplitude at the positions of two fingers.…”