AQI Monitoring And Fuzzy Evaluation System For Classroom Based On The Internet Of Things

As an important place for students to study and live,the Air Quality Index(AQI)of classrooms has a direct impact on students’ health and learning efficiency,so the monitoring and evaluation of AQI for the classroom is particularly important.The existing indoor air quality intelligent monitoring system has problems such as fewer detection indicators,lack of real-time monitoring,and imperfect evaluation methods.Therefore,using Internet of Things(IoT)and Java Web and other technologies,an AQI monitoring and fuzzy evaluation system for the classroom is designed reasonably,which is an important problem to be solved.The main contents of this paper are as follows:Firstly,the overall design of the AQI monitoring and fuzzy evaluation system for classroom is carried out.The overall framework based on the three-tier architecture of the Internet of Things is designed,the monitoring and evaluation indexes of AQI are determined,and the structure of the AQI data acquisition module of the perception layer is designed.On this basis,the data transmission process is determined,and the system network layer communication is designed based on MINA framework,HTTP and MQTT protocols.In addition,the software overall design of AQI monitoring management system and the design of AQI fuzzy evaluation module are also introduced.Secondly,by analyzing the shortcomings of the classical AQI evaluation method,an AQI fuzzy evaluation model for classroom is designed based on the fuzzy modeling method.The evaluation process of this model is divided into five steps.Firstly,the input set and output set are determined,which fuzzified by membership function;and then fuzzy evaluation rules are determined and Mamdani fuzzy inference calculation is carried out respectively;finally,the defuzzification output is used as the fuzzy evaluation value ofA QI for the classroom.At the same time,the model simulation experiment is carried out by using MATLAB fuzzy toolbox and Simulink.Then,with temperature and humidity,CO2,VOC,formaldehyde,PM2.5 and PM 10 as the monitoring indicators,the software design of AQI monitoring system for the classroom is introduced in detail,which consists of IoT open platform,Healthy classroom management platform,PC front end and mobile APP.Based on the JEECG development platform,IoT open platform and the healthy classroom management platform are implemented using JAVA WEB,MySQL database and other technology,completing device access,data transmission and management for devices and users respectively,and PC front end and mobile APP for data display and device control are designed and implemented using the VUE.js framework.Finally,the software test of AQI monitoring system is carried out,and the calculation results of classical AQI and fuzzy AQI are compared and analyzed based on the actual monitoring data of air quality in the classroom.The results show that,the software system runs stably,the functions of each part are basically realized,and it can monitor and accurately evaluate the air quality in the classroom in real time.