Research On Air Filter Testing System With Computer Control

After the actual state of the companies producing air filters in our country is analyzed, it is found that one of the reasons of the bad quality of the homemade air filters is the out-of-date measuring methods and testing systems. The purpose of this thesis is to research and develop a set of testing system to measure the performance of the air filters, which can simplify the operation, shorten the testing period, improve the testing precision and reduce the cost for air filter firms.In this thesis, computer simulation technology is applied to the air filter testing system with computer control, so that the entire testing & controlling system can be researched, through the establishment of mathematical model, the design of several controllers and the visible research. First, the whole system is designed in a general scheme, including confirmation of the controlling task and the testing methods of the system, the choice of the hardware projects, introducing the operation principle of the system, the selection of types of main equipments, and the modularization design of the whole framework system.Second, for the forementioned testing plan, the mathematical model of gas flow-rate control is made. With the emulational module Simulink of Matlab, the simulation models of PID, Fuzzy and Fuzzy_PID are designed, the digital simulations are carried out, and ideal control effect is achieved.Third, as the testing & controlling platform of the whole system, Kingview can be used to input/output data needed, and to make the complicated mathematical operation accomplished in Matlab, then its operational result is returned to Kingview. Ultimately, by making the full use of the affluent graphic function of configuration software Kingview, the emulational course and its results are represented vividly in the way of animated drawing, thus the visualization of sumulation is achieved.Last, the synchronous communication is achieved between simulation software Matlab and control software Kingview in industry, by DDE technology supported by two sides.There are two innovative points in this paper. With the comprehensive utilization of the advantages of configuration software and mathematical tool Matlab, a new resolvent is found for the realization of visible simulation. A new staged composite control method Fuzzy_PID is adopted combining traditional PID control and Fuzzy control, and is applied to the air filter testing system designed. Through the study of this thesis, the system to measure the performance of the air filters based on the data collection and computer automatic control system has been completed. The accomplishment of this testing system offers a set of facility for the filter companies in our country to guarantee the quality of their products. Meanwile, this thesis has some guides to the design and manufacture of the newly-built air filter testing systems.