Design And Implementation Of Gas Cylinder Monitoring Terminal Based On NB-IoT

In recent years,while the state vigorously carries out the construction of ecological civilization and promotes "coal to gas" transformation,gas leakage and explosion incidents occur from time to time,which poses a major threat to residents' personal and property.By analyzing the causes of gas leakage and explosion,it is found that the main factors of the accident are the improper use habits of users and the quality problems of gas cylinders.Therefore,it is imperative to strengthen the management of gas cylinders.In order to improve the level of gas cylinder management,technical means can be adopted to achieve real-time and digital management of gas cylinder.According to the requirement of gas cylinder safety monitoring,a terminal equipment for real-time monitoring of gas cylinder is designed.The monitoring terminal can sense the information of environment in real time,and report the information to the Internet of Things cloud platform through the NB-IoT network.The Internet of Things platform receives and saves terminal information and can check the status information of gas cylinder temperature,gas margin,location at any time,and alarm the dangerous events such as fire and gas leakage.A algorithm of transportation mode discriminant is designed for low power control and transplanted to the Microcontroller.The test results show that the terminal has reasonable structure,accurate data acquisition,strong communication ability and low power consumption,and can meet the needs of gas cylinder safety monitoring.The main work of this thesis is as follows:(1)The problems in the use of gas cylinder are analyzed,the existing safety management technology of gas cylinder is investigated,and the development of NB-IoT technology is studied.On this basis,the requirements analysis of gas cylinder monitoring terminal is carried out,and the scheme of gas cylinder monitoring system,terminal structure and terminal hardware is put forward.The problems of reliable data acquisition and transmission,low power control and explosion-proof in the design are discussed,and the corresponding solutions are given.(2)The hardware of gas cylinder monitoring terminal is selected and designed according to the module.Hardware circuit design includes the design of main control module,gas concentration sensor,temperature sensor,battery voltage acquisition circuit,pressure sensor,positioning module,NB-IoT wireless communication module,power module and PCB.(3)The software of gas cylinder monitoring terminal is designed in detail.Intelligent control software is designed to control the work flow of the system according to the low-power algorithm.Data acquisition program is designed to collect the information of gas concentration,temperature,battery voltage,pressure and location.Data reporting program is designed to enable the system to carry out remote wireless communication.Cloud platform receiving program is designed to save and process the received terminal data.(4)Aiming at the problem of low power control,a transportation pattern recognition algorithm is designed.Through extracting three characteristic vectors of speed,distance and steering angle from GPS raw data,the SVM algorithm is selected to construct the model to distinguish the mode of transportation.After testing,the accuracy of judgment is 95.3%.Then the realization of the algorithm in the Microcontroller is introduced.(5)The structure,function,performance and power consumption of the gas cylinder monitoring terminal are tested.The experimental results show that the designed gas cylinder monitoring terminal meets the requirements of the system design,can realize the functions of data acquisition and reporting,and the power consumption is controlled within a reasonable range.