Design Of Variable Friction-Based Tactile Interactive Device And Its Application In Macro Texture Reproduction

Vision and audition are the most common channels of human-computer interaction,but they are both single direction information that can only be spread from machine to operators.For improving the sense of immersion and reality,and also for adding more channels on interaction,some technologies of combining various models of sensation have been put forward.The latest kind of the technology is haptic interaction.Comparing to vision and audition,haptic interaction is excellent at recognizing attributes of objects' surface and is able to interact with operators bidirectionally.In this paper,we have designed a variable friction-based tactile interactive device that can stimulate micro texture whose internal space gap is in the level of millimeter or below,and then we integrate it into a curvature-reproduction device for rendering the macro texture whose space gap is in the level of centimeter or above.The macro texture contains both the information of roughness and curvature.In this study,we have examined the research activities on haptic interaction around domestic and overseas,and we found that the most natural way to reproduce surface texture is by using the variable friction-based tactile interactive device,and the most real way to reproduce surface curvature is by using extruded curvature reproduction device.Consequently,this paper designed and evaluated texture feedback device based on variable friction as well as integrate it into an extruded curvature reproduction device for deep research.Based on squeeze film effect,we have designed the major modules of the variable friction-based tactile interactive device,including resonance module,finger positioning module and system control module.This paper presented its theoretical arithmetic,modal analysis,and actuator design.Furthermore,the finger positioning device was identified by comparing existing finger positioning solutions from three aspects of dynamics,integration,and transparency.Then,the driving circuit of the actuator was designed which is controlled by microcontroller for texture generation.Finally,combined with the foresight of the haptic interaction device,a variable friction-based tactile interactive device which could be applied on consumer electronics was proposed.The final device design was determined by building an experimental test platform optimized from both materials and processes,and carrying out experiments on it.Differential thresholds of sparse and dense texture gates were measured by the experiments of just noticeable difference(JND).Furthermore,the variable friction-based tactile interactive device was integrated into a curvature reproduction device to simulate the macro texture containing both texture and curvature information.The mutual influence of texture and curvature was verified by the experiment of absolute magnitude estimation.