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 In this paper the logical structure of contactless telemechanical system for distributed objects is discussed. A simple method of variable system structure for transmitting and receiving telemechanical information is adopted. The idea is that the information occurred in every controlled point (station) and the information of some of those objects,which frequently change their states, are transmitted continually and cyclically, while for other objects their information is transmitted only after any change in... In this paper the logical structure of contactless telemechanical system for distributed objects is discussed. A simple method of variable system structure for transmitting and receiving telemechanical information is adopted. The idea is that the information occurred in every controlled point (station) and the information of some of those objects,which frequently change their states, are transmitted continually and cyclically, while for other objects their information is transmitted only after any change in their states. Thus,the speed of operation will be increased, and also the error probability of system synchronization will be decreased. For the realization of the variable logical system structure, several blocks are used repetitively. For example, two commutators and one simple logical unit are used to construct a simple automatic sequential encoder, and at the same time, the two commutators are used also to operate as a matrix commutator for receiving telesignalling information etc. Therefore the system is comparatively simplified and attains a higher degree of "minimization".  本文研究了无触点集中分散目标远动系统的逻辑结构.文中提出了采用简单的系统变结构来发送和接收信息的逻辑结构方式.对被控制点及一部分比较重要或变化比较频繁的被控制目标的信息,保留了循环传送,而对大部分变化比较慢的被控制目标则采用目标有变化时才传送信号的方式,这样就提高了系统的平均动作速度,同时也减小系统的失步概率.文中采用环节的复合利用及简化的逻辑单元线路来实现这种系统的逻辑结构.例如用两个分配器和一个简单的逻辑单元“和”线路组成了很简化的选点自动程序编码器,同时这两个分配器又复合利用兼组成目标信号接收矩阵式分配器等,因而可以使得这种系统同时又具有较高的极简化度.  It is well know that symmetrical components are very useful in nubal anced voltages, short circuits and open circuits calculations. But under special conditions, special technique, such as modified symmetrical components, must be used in order to .meet special requirements. This paper illustrates a method of modified symmetrical components to analyze the operating characteristics of an inverted Yconnected induction motor find shows how the trick is applied.  对称分子，（Ｓｙｍｍｅｔｒｉｃａｌ ｃｏｍｐｏｎｅｎｔｓ），对於电压不均及意外短路（Ｓｈｏｒｔｃｉｒｃｕｉｔｓ）及断路（ｏｐｅｎ ｃｉｒｃｕｉｔｓ）等之计算，极感方便，早为吾人所熟知，无庸赘言．然遇特种问题时，必须随机应变，以期达到融会銮通之效．本文即采用“变通对称分子”，（Ｍｏｄｉｆｉｅｄ Ｓｙｍｍｅｔｒｉｃａｌ ｃｏｍｐｏｎｅｎｔｓ），分析普通三相感应电动机，在倒接Ｙ式情形下之运用效能，并示其巧妙之处．  In reactancetube frequency modulation circuits, the fractional frequency deviation is expected to vary with the phase shift constants of the modulator and the LfICf ratio of the tankcircuit of the oscillator. The way in which the frequency deviation is affected by these factors is discussed theoretically. Experimental checks are made, Two types of circuits are studied, the inductive and the capacitive reactancetube circuits. It is found that within the straight portion, of the operating characteristic... In reactancetube frequency modulation circuits, the fractional frequency deviation is expected to vary with the phase shift constants of the modulator and the LfICf ratio of the tankcircuit of the oscillator. The way in which the frequency deviation is affected by these factors is discussed theoretically. Experimental checks are made, Two types of circuits are studied, the inductive and the capacitive reactancetube circuits. It is found that within the straight portion, of the operating characteristic of the tube, the agreement is fairly satisfactory.  在电抗管调频电路中,频偏与载波频率之比值,乃随调频器之诸变相常数,及振荡电路中Lf/Cf之比率而变更。本文即就两种基本调频电路,作理论之推引,得出两个基本方程式,表明其间之关系,并佐以实验之证明。   << 更多相关文摘 
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