Application Of Breath-driven Triboelectric Nanogenerator In Human-machine Interaction System

Human-machine interaction(HMI)technology is one of the eight key technologies in artificial intelligence.In HMI system,HMI sensor is the primary link and hardware foundation to realize intelligent identification and intelligent control.In the current HMI equipment,its sensing components are mainly based on gestures? body movements and voice interaction.Because some disabled people can't express their intention clearly through physical activity and voice,these HMI ways are not friendly to these disabled people.In addition,the energy supply of the current HMI sensor depends on the traditional battery,which needs to be charged or replaced frequently.Based on the triboelectric nanogenerator driven by respiration,two kinds of HMI sensing systems based on respiration are developed in this paper.The triboelectric nanogenerator is used to absorb mechanical energy from the breathing air flow and generate corresponding electrical signal,which is used to control the electric fan,electric lamp and other electrical equipment.In addition,the electrical signal generated by the triboelectric nanogenerator driven by respiration is transformed into the electronic text.The HMI sensor based on the triboelectric nanogenerator driven by respiration reduces the threshold for special people to use modern electrical equipment,and provides a friendly way of information expression,and it does not need external power supply to realize the self-powered of the sensor.The main research contents are as follows:(1)A single electrode triboelectric nanogenerator driven by air flow was designed by using polyethylene terephthalate film with nanowire structure.The triboelectric nanogenerator can absorb the mechanical energy from the air flow of human breath and generate the corresponding electrical signal according to the normal breath or intentional breath.Combined with signal processing circuit and wireless transmission circuit,the intelligent wireless HMI system based on respiration is further developed.Compared with the traditional HMI equipment which relies on sensing body movement or language,the system can transform the real-time breathing behavior of human body into control signals,which can be used for effective wireless control of electrical equipment,so that the electrical equipment such as fans and lights can be controlled without relying on body movement or language.This kind of self-powered HMI sensing system based on respiration can provide great convenience for the special people who lose the function of body movement and language to use the modern electrical equipment.(2)A kind of triboelectric nanogenerator with three-dimensional(3D)printing resin shell and paper-based carbon nanotube film was designed.The external structure of the resin was prepared by UV curing 3D printing technology,and the paper-based carbon nanotubes(CNT)conductive film was prepared by coating solution on one side of kraft paper.This paper-based CNT conductive film can generate corresponding electrical signals under the action of human breathing air flow.3D printing technology is used to build a streamline structure inside the resin shell,which improves the service life and stability of the paper-based electrode.An intelligent wireless HMI system based on respiration is developed based on the friction nano generator with full printing.The electronic text is input by using the electrical signals generated by different respiration types.This self-powered HMI sensing system based on respiration provides a friendly way of information expression for special people.