A Study on the Layout Design System for Power Plants based on Knowledge-Based Approach.

利用约束导向搜索的概念，提出了一种基于知识的电厂布局设计方法。并在此基础上开发了计算机辅助设计系统。所开发的系统的特点总结如下：1。该系统由布局规范的声明式表示、“约束”和用于从约束自动生成布局的布局算法组成。这种分离有效地使该方法广泛适用于各种布局问题。布局的描述分为“拓扑布局”和“维度布局”两部分，即将厂房的整个空间划分为具有模块化大小的有限隔间。对于前者，采用约束导向搜索程序，确定植物组件之间的组合关系，以满足空间布局条件，即约束条件。对于后者，使用数学优化程序来确定隔室的实际尺寸，以便在考虑部件尺寸的情况下最小化厂房的尺寸。这种混合方法对复杂布局的确定是有效的。该系统采用面向对象编程环境在工程工作站上用Common Lisp语言实现。所采用的编程方法和建模方法使系统易于开发并应用于各种类型的植物。该系统已应用于一些核电站的设计案例。结合实际设计问题，验证了该方法的正确性和有效性。

A knowledge-based approach for layout design of power plants was developed using a constraint-directed search concept. And a computer-aided design system was also developed based on the approach. The characteristics of the system developed are summarized as follows :1. The system is composed of the declarative representation of layout specifications, "constraints" , and the layout algorithm for automatically generating layouts from the constraints. This separation is effective to make the approach widely applicable to various layout problems.2. The description of a layout is divided into two parts, "topological layout" and "dimensional layout" , by means that the whole space of a plant building is divided into the finite compartments with a modular size. For the former, a constraint-directed search procedure is applied in order to fix the combinational relations among plant components so as to satisfy the spatial layout conditions, that is the constraints. For the latter, a mathematical optimization procedure is used in order to determine the actual dimensions of compartments so as to minimize size of a plant building considering size of components. This hybrid procedure is effective for determining the complicated layout.3. The system was implemented with an object-oriented programming environment written in Common Lisp on engineering workstations. The programming approach and modeling method used make it easy to develop the system and apply it to various types of plants.4. The system was applied to some design cases of nuclear power plants. Its validity and effectiveness were checked with actual design problems.