Research On Vibration Feedback Perception Evaluation In Wrist Worn Equipment

With the rapid development of mobile computing and human-computer interaction technology,wearable devices have become another hotspots in the scientific fields following smartphones and tablets PCs.Miniaturization and portability make wearable devices become a real UGC(user generated content),which could collect user generated content all the times.At the same time,the information output by these wearable devices is limited,which lead to a bad user experience.Tactile feedback is an ideal interactive mode for wearable devices because of immediacy and efficiency,and vibration feedback is currently one of the most common tactile feedback.However,the current vibrotactile feedback patterns of most wrist-worn devices are too simple to enable effective interaction.A single vibration can output only two kinds of information,i.e.,"vibrating" and "not vibrating",limiting the feedback information received by users.In order to find how much patterns wrist can distinguish,we present a wristband prototype that can produce many kinds of vibrotactile feedback,allowing users to obtain multi-semantic information transmitted through the tactile channel by recognizing multiple vibrotactile patterns.With four vibration motors embedded in different positions in a wrist-worn device,wristband can produce a variety of vibration patterns such as a positional vibration pattern using a single motor and a circular vibration pattern using multiple sequentially vibrated motors.Based on the wrist-worn prototype of the main work is as follows:First,we need to determine the influence of intensity on vibration pattern recognition through pilot experiment,the results show that no-significant different intensity don't affect the recognition of vibration patterns.Second,an experiment was conducted to study the perceived differences in different vibration patterns(nine).According to the result the experiment,the order of vibration patterns that can be easily distinguish by users is as follows:positional patterns,total patterns,diagonal patterns,circular patterns.Third,five vibration patterns have been preserved through previous work.In order to evaluate the perceived differences between these five vibration patterns in stationary state and motion state,an experiment was conducted.The experiment results show that the perception in stationary state is significantly better than motion state.This research is a basic study on vibration feedback interaction in wrist-worn devices,which is of a certain significance for conducting the design of these devices to deliver complex information.