The Development Of An Controller Of Highfrequency Fatigue Tester Based On FPGA Technology

One of metal material testers is highfrequency fatigue tester, which tests the fatigue performance of drawing , compressing of metal material and its alloy in room temperature condition .The controller of highfrequency fatigue is used to control the highfrequency fatigue tester according to the intention of users, and it acts as a link of tester and user. In this thesis , a new control has been developed based on microelectronics technology of the age ,by improving on existent controllers using modern controlling theories, microcomputer technology , microelectronics technology ,and the object of this controller is highfrequency fatigue tester.In chapter 1 , highfreqency fatigue tester , and a survey of progressing of its controller home and abroad , has been discussed firstly. Then the subject and the contents of the thesis are put forward.In chapter 2 , the method of designing hardware circuits of system controller, a method of designing circuits using HDL( Hardware Description Language ) , has been presented . The main characteristic of this method is to design circuits in the form of top to down , which can improve the designing efficiency to a great extent, and which can decrease the cost of designing . Based on this , the realization of system circuits has been discussed in the thesis .In chapter 3 , theories and technologies of fuzzy logic control have been presented firstly , and then the merits and shortcomings of fuzzy logic control and common PID control . Based on these , the method of control used in the thesis , a method of reasoning parameters PID fuzzily, has been introduced . The method possesses the merits of ones above. In the end , the controller has been designed in great detail using the method , and the scheme of hardware realization ,which can balance real time and resource consuming to the greatest extent, has been presented .In chapter 4 , a sine wave generator and modulating circuits of wave magnitude have been designed in great detail , which are realized using FPGA technology . In the end , the simulation result of circuits as above , which is to check the functions and time of circuits , is showed .In chapter 5 , a controller of reasoning parameter PID fuzzily has been designed using FPGA technology . User can achieve parameters PID in real time by transmitting data to the machine through bus , and get a good result of control. In the end, the simulation result is provided .In chapter 6 , the rest of circuits of controller have been designed , includingvarious measuring circuits , speed regulating circuits , FPGA configuring circuits , microcontroller circuits . These circuits above are essential for the entire controller to work smoothly . In the end of this chapter, program flow diagram of the controller is provided.In chapter 7 , a brief summary on the contents above is provided .