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On structured fault tree construction by modularizing control loops

机译：通过模块化控制回路构建结构化故障树

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The objectives of this article are f (l) to develop the fault trees for control loops in a way that they all appear in a proper form and as modules in the fault tree for the whole system; and also (2) to modularize each control loop in a system properly to establish its unit model. These two methods are essentially equivalent. Either of them can be applied to facilitate constructing fault trees for the whole system. To accomplish such equivalent or parallel objectives, we will first take the feedback and feed forward control loops in the heat exchanger system as examples and then f (l ) construct the fault trees of deviations in controlled variable for the two control loops in the way that all of their non- basic terminal events should be deviations in variables on those streams that connect to the loop from their outside in the system; and (2) establish the unit model for each of such two loops. One of the purposes of (2), which will not be addressed here, is to regard each control loop as a dummy unit and hence reduce the system to facilitate system input and fault tree construction eventually for complete automation purpose.
机译：本文的目的是f（l）以控制回路的故障树的形式出现，使故障树以适当的形式出现并作为整个系统的故障树中的模块； （2）适当地模块化系统中的每个控制回路，以建立其单元模型。这两种方法本质上是等效的。它们中的任何一个都可以用来促进为整个系统构造故障树。为了实现这些等效或并行的目标，我们将首先以换热器系统中的反馈和前馈控制回路为例，然后f（l）构造两个控制回路的控制变量偏差的故障树。它们的所有非基本终端事件都应该是那些从系统外部连接到环路的流上变量的偏差。 （2）为这两个循环中的每一个建立单位模型。 （2）的目的（此处将不解决）的一个目的是将每个控制回路视为一个虚拟单元，因此减少了系统，以便最终实现完全自动化的系统输入和故障树构造。

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