Dissertation
Dissertation > Industrial Technology > Machinery and Instrument Industry > Mechanics (mechanical design of the basic theory ) > Mechanical kinetics > Mechanical movement > Mechanical stability and balance

Research on Control of Precision Centrifuge Dynamic Balance System

Author WangZuoJi
Tutor WangYi
School Harbin Institute of Technology
Course Control Theory and Control Engineering
Keywords Precision centrifuge Dynamic balance RTX Decoupling
CLC TH113.25
Type Master's thesis
Year 2008
Downloads 113
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Precision centrifuge is large high-precision testing equipment which is used to label and test the inertial components. Some minimal disturbance is possible to influence the accuracy, such as the existing unbalance of precision centrifuge and response time of precision centrifuge. To improve the accuracy and efficiency, it is necessary to use a new way to adjustment at two different flats to reduce the unbalance. With this dynamic balance system, the unbalance is reduced; therefore, the realization of such dynamic balancing system plays an extremely important role in this project.Firstly, according to the analysis of the structure of precision centrifuge, this paper establishes coordinate system of rotation axis and fixed axis with considering the influence of different force; then establishes a mathematic model of precision centrifuge. In addition, illuminate comprehensive calculation method to calculate the unbalance.Second, based on the modeling and analysis of precision centrifuge, we simplify the mathematic model of precision centrifuge. Moreover, according to the requirement of cut-off frequency, we use the way of lag correction to control the dynamic system. Finally, in this dynamic balance system, relief arrangement and engage force influence each other. In order to meet the requirement, this paper uses the MATLAB to simulate the rotor at different speeds and gives a way to meet the requirement. It can not only reduce the unbalance of the precision centrifuge, but also make the engage force varying within the allowed range.Third, for the real-time control requirement of precision centrifuge, this paper researches on the design of real-time control system based on RTX. At beginning, this paper explains that why we choose this method. In addition, this paper illuminates the defect of Windows NT operation system and necessity of RTX. Moreover, the shared memory is used to communicate between the different processes, so it improves the data acquisition and data updating. Furthermore, realize the comprehensive calculation method mentioned in chapter 2. Finally, compare the response time between with RTX and without RTX. Finally, this paper illuminates the functions of executive program. According to the requirement of PLC design and communication protocol of Matsushita, serial ports are used to communicate between PC and PLC.

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