Research And Development Of Online Experimental Platform For System Modeling And Simulation

Due to the limitations of experimental teaching conditions,the traditional experiment of science and engineering can not meet the development of teaching.Meanwhile The online experimental platform,with the rapid development of computer technology,no time and place constraints,rich and friendly graphical interface and other advantages make the online experimental platform is the new trend of experimental teaching reform,is a powerful supplement to traditional experimental teaching.This thesis introduces the characteristics and functions of online experiment platform,and expounds the significance of online experiment platform research.Based on the investigation and research on the construction and application of the online laboratory in China,and based on the experiment of "System Modeling and Simulation",this thesis also introduces a case study of the characteristic system model,System Modeling and Simulation "course online experimental platform.This thesis builds 6 system models which based on the experimental system of "System Modeling and Simulation".On this basis,an online experiment platform is developed.The establishment of hysteresis ELM model and hysteresis BP model,the establishment of supermarket refrigeration system model and the development of online experimental platform are innovations of this article.Firstly,this thesis introduces the development and application of distance education,and then emphatically elaborates the production of online experiment and online experiment platform and its development at home and abroad.It puts forward the idea of constructing network online experiment platform,and simulates the whole process of experiment.And the necessity and significance of this research are put forward according to the current situation of the experimental platform.Secondly,the hysteresis ELM model and hysteresis BP model have been established by the experimental modeling method.The hysteresis model is introduced in the original ELM model and BP model to establish the hysteresis model.The hysteresis parameters are adjusted by the gradient descent method,and the two hysteresis models are used for short-term wind speed prediction.The experimental results show that the improved ELM model and hysteresis BP model can improve the accuracy of wind velocity forecasting,and the prediction precision of the delayed ELM model is higher than that of the hysteresis BP model.Thirdly,the model of spring mass damping system,inverted pendulum system and tank level system is established by mechanism modeling method.Model verification and simulation are carried out,and a PID controller is designed for each model to achieve good control effect.Supermarket refrigeration system model is a key case of mechanism modeling in this thesis,and a good model of supermarket refrigeration system includes display case model,suction tube model,compressor model.And the mathematical expression of performance evaluation index of the supermarket refrigeration system has been also established.Finally,on the basis of establishing a good experimental case system model,an on-line experiment platform of "system modeling and simulation" is developed.The ELM model,hysteresis BP model,spring mass damping system model,inverted pendulum system model,Level system model,supermarket refrigeration system model for related operations.At the same time,also supports online video playback and other auxiliary function function.