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The representation Equation （4.5） is equivalent to the standard form, but the parameter values are quite different. This may cause great difficulties for anyone who is not aware of the differences, particularly if parameter 1/ki is called integral time and kd derivative time. It is even more confusing if ki is called integration time. The form given by Equation （4.5）is often useful in analytical calculations because the parameters appear linearly. The representation also has the advantage that it is possible to obtain pure proportional, integral, or derivative action by finite values of the parameters.
V.CONCLUSIONS
Basing on wide investigation of existing technology abroad, the electro-hydraulic control system for hydraulic supports was designed and realized, and it has passed the national institutions certification examination. The system has run reliably for three months in industrial experiment at Pingmei Group in Henan province. The electrohydraulic control system has laid the foundation successfully for safe and high efficient coal mine, which improves significantly the domestic automation level of full mechanized coal mining face.
REFERENCES
[1] W. Xiaojie,Y. Yuesen. Present Status and Outlook of Electric and Hydraulic Control Technology for Hydraulic Powerd Support [J]. Coal Science and Technology, 37 (2009) 25-29.
[2] Elektro-Elektronik Pranjic.Documentation Electro-hydraulic system PRA_matic v1.0 [M]. 2007.
[3] D. Adenekan. Is Linux Better than Windows Software[J].Software, IEEE. 26 (2009) 104-104.
[4] M. C. Ernest. Intrinsically Safe Systems-Trends in Design and Installation Standards[J]. Industry Applications, IEEE 1 (1978) 87–89.
[5] S. Liu, J. Liu, . Zhong. Design of intrinsically safe buck DC/DC converters[J]. Electrical Machines and Systems, 2005. ICEMS 2005.Proceedings of the Eighth International Conference, 2 (2005) 1327-1331.
[6] B. Schaefer, G.H. Borges, D.P. Malohn, Global installation of intrinsically safe and nonincenpe systems[J].Petroleum and Chemical Industry Conference, 2003. Record of Conference Papers. IEEE Industry Applications Society. 15-17 (2003) 349.
[7]Barbalace, A.; Luchetta, A.; Manduchi, G.; Performance Comparison of VxWorks, Linux, RTAI, and Xenomai in a Hard Real-Time Application[J].Nuclear Science, IEEE Transactions on Volume 55, Issue 1, Part 1, Feb. 2008 Page(s):435-439.
[8] Pinho, L.M.; Vasques, F.Reliable real-time communication in CAN networks.Computers[J]. IEEE Transactions on Volume 52, Issue 12,Dec. 2003 Page(s):1594-1607.
[9] Barranco, M.; Proenza, J.; Rodriguez-Navas, G. An active star topology for improving fault confinement in CAN networks[J]. Industrial Informatics, IEEE Transactions on Volume 2, Issue 2, May 2006 Page(s):78–85.
经典和模糊PID控制算法对比分析
摘要——模糊PID控制器实际上跟传统的PID控制器有很大联系。区别在于传统的控制器的控制前提必须是熟悉控制对象的模型结构，而模糊控制器因为它的非线性特性，所以控制性能优于传统PID控制器。对于时变系统，如果能够很好地采用模糊控制器进行调节，其控制结果的稳定性和活力性都会有改善。但是，如果调节效果不好，执行器会因为周期振荡影响使用寿命，特别是调节器是阀门的场合，就必须考虑这个问题。为了解决这个问题，出现了很多模糊控制的分析方法。本文提山的方法采用一个固定的初始域，这样相当程度上简化了模糊控制的设定问题以及实现。文中分析了振荡的原囚并分析如何抑制这种振荡的各种方法，最后，还给出一种方案，通过减少隶属函数的数量以及改善解模糊化的方法缩短控制信号计算时间，有效的改善了控制的实时性。论文网
关键词——模糊控制，计算机控制，反馈调节；
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