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In this paper,fuzzy number is used to take the uncertainty in the job durationtime of the project network into consideration.And a procedure is proposed to cal-culate the completion time of the entire project in terms of the probability dis-tribution.Compared with PERT,The method introduced is reasonable,simple andeasy to handle, 在本文中用模糊数来考虑工程网络中作业时间的非肯定性,且介绍了一种以可能性分布表示的整个工程完工时间的方法。与 PERT 相比较,这里介绍的方法是合理的,简单的,且便于应用。 The Variable Frequency Speed adjustment system with slip control is a simple completion easy control suitable to be used in utility A. C. Speed adjustment system with high-accuracy and fast inverteble. First, this text describes this system's primciple, analyses the base structure and operation principle about the whole system, then proves the feasibility and the advantage of this system via marry test data, static and dynamic waves and relative power parameters. At last, this text pointed out the notes... The Variable Frequency Speed adjustment system with slip control is a simple completion easy control suitable to be used in utility A. C. Speed adjustment system with high-accuracy and fast inverteble. First, this text describes this system's primciple, analyses the base structure and operation principle about the whole system, then proves the feasibility and the advantage of this system via marry test data, static and dynamic waves and relative power parameters. At last, this text pointed out the notes in debugging and the problems researching in the next stage. 带转差控制的变频调速系统是一种简单易行、控制清晰、适用于高精度、快速可逆的实用交流调速系统。本文首先阐述了这种系统的理论基础;分析了整个系统的基本结构和工作原理;并通过大量的试验数据,稳态和动态波形以及相关的力能指标等论证了该系统的可行性和优越性;最后指出了在调试中一些应该注意的和值得进一步探索的问题。 This paper describes the Research and development based PC-GPIB measurement controller and Bus Analyzer. The dissect to interpret BASIC language and Extension method for measurment Sentence, Completion of Bus Analyzer Function, and Design for GPIB interface care, etc, is all described. The project development is succeed, explore a beneficial mothod for measurement controll computer development. 本文详细阐述了在PC机上实现“GPIB两用机”的研制与开发过程。对解释性BASIC语言的运行机制、剖析过程及测量语句的扩充方法,母线分析仪功能的实现、GPIB接口卡的设计等诸方面均进行了详尽的探讨。该机的研制成功,为我国测控计算机的研制探索了一条有益的途径。
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