Design And Development Of Control System For Micro Indentation Instrument

As a new material testing technology,micro-nano indentation method has the strong point of rich simple experimental results and operation and high credible,and has shown a vast application vista in various materials related fields.But the design of micro nano indentation instrument involves multi-disciplinary knowledge,including:material mechanics,instrument design,hardware design,software design and other related knowledge.On the one hand,the development of foreign indentation technology has matured,and the relevant technology process is comprehensively leading the domestic;On the flip side,the relevant research started late at home,and the export of related devices and materials was restricted abroad.Therefore,the design of an independent intellectual property rights,most of the key devices to achieve domestic indentation instrument and its control system process is urgent.The control of indentation instrument is mainly to the motor drive control and sensor data acquisition and transmission.In order to solve the creasing machine control system is not stable,not professional problem,this article through to the instrument as a whole is analyzed and the corresponding control device for selection,and then choose good components to design and circuit principle diagram,respectively,on a piece of circuit board test optimization,each function modular and design procedures and test the optimized integrated in the main program,respectively,and then the instrument related two control methods is optimization algorithm.The main research work of this paper includes the following aspects:(1)the overall architecture of the instrument and control demand is analyzed,and the force sensor,displacement sensor,two phase stepper motor,the five phase stepper motor processing components analysis and selection,the network communication,experiment control is analyzed,and the total programming of the controller and communications devices and additional needs analysis and selection of device.Conceive and preinstall the future improvement direction of the instrument.From the aspects of hardware and software and control algorithm,the corresponding structure is designed to meet the future expected and unexpected upgrade and upgrade,and the performance of the instrument is constantly improved.(2)Analyze the characteristics and requirements of the selected components,divided into motor drive module,data acquisition module,controller module,network communication module and power module,and design the schematic diagram respectively.The schematic diagram is integrated on a circuit board through PCB design.Send the finished circuit board to the factory to make the board,weld the purchased devices onto the circuit board,and constantly adjust and optimize the circuit through various circuit tests.(3)According to the design requirements,the software is divided into motor drive,data collection,data transmission,human-computer interaction and other modules.It is divided into several independent modules to write different programs for testing,and then all the modules are integrated in the main program,and the control effect is improved by continuously optimizing the program through testing.According to the experimental process,design load fuzzy predictive control method and soft landing method.Through continuous experiments and theoretical attempts to adjust the algorithm,the final control from the actual demand and control effect of the better control.Write related implementation program,test stability and accuracy.Finally,by applying it to the micro indentation instrument developed by the research group,the experimental results show that the material parameters are in line with the theoretical range,which shows that the design effectively meets the needs of the micro indentation instrument.