宁波郁家巷商业运营策略.ppt

机械科学研究总院硕士学位论文摘要
ABSTRACT
For its excellent cost performance, electro-hydraulic servo vibration table has been widely applied in the industrial field. There are many problems in traditional control which uses the analog controller. The performance of system will be affected by the change of temperature and humidity easily because of the numbers of independent ponents. It is also hard to modify and extend the function of system for the fixed structure of controller. In order to e the ings of analog controller, this paper discuss a kind of digital control system which can improve the stability, reliability and control accuracy.
Firstly, set forth the development of electro-hydraulic servo vibration table and its control methods, summed up the advantages of digital pared to analog control. Secondly, build a mathematical model by analyzing the characteristic of servo valve and hydraulic cylinder. On the base of the model, this article analyzed the static and dynamic characteristics of the whole system briefly. Then, build a digital control system platform under the VxWorks environment. Designed an easy fuzzy controller and a digital PID controller pared the performance of system by using MATLAB/Simulink tool. Developed the PC management graphical interface by using Tilcon. Finally, did the experiment bine the designed PID controller which has online tuning parameters and existing hardware. Verified the correctness of the simulation and analyzed the effects of vibration frequency and load mass through the experiment. The results show that the control system’s
tracking performance is better when the vibration frequency is low;The response curve’s
overshot reduces, adjustment time increases, rise time increases and the system’s oscillation reduces when the load mass is relatively heavy.
The article aim at building an electro-hydraulic digital servo control system. By theoretical analysis, simulation and experiment, realized the closed loop position control and signal