Study on Function-Based Design Support Techniques of Engineering Systems

作为一种表达包含设计者意图的设计信息的功能建模技术，对Lind提出的多级流动建模(MFM)进行了研究。MFM存在的问题是：(1)它不能模拟能量形式的变化；(2)它与所谓的设计图关系不大，因为它不能表示系统结构。第(1)项的问题是通过显式表示能量形式来解决的，例如热等。为了摆脱第(2)项的问题，在MFM模型中增加了结构-功能模型和结构模型。提出了由目标模型、功能目标模型、功能结构模型和结构模型组成的四层设计模型，并在SmallTalk-80上开发了界面系统，实现了四层设计模型。通过接口系统表达集中供热系统和除尘处理系统的设计信息。通过表达试验，证实了设计信息被系统地、有组织地表达出来。此外，设计意图的差异也得到了明确的表达。应用伍兹提出的混合现象(HPT)理论，结合系统结构模型和数值模拟程序，从四层设计模型所表达的系统结构出发，推导出系统行为。通过引入Kiriyama提出的建模本体的因素，将HPT扩展到处理多个模型。通过一个集中供热系统的概念设计，验证了结构分配到功能和行为派生技术的有效性。

As a functional modeling technique to represent design information including designer's intention, the Multilevel Flow Modelling (MFM) proposed by Lind has been investigated. The MFM has the problems that (1) it can not model the change of energy form and (2) it has little relation to what is called design chart because it does not represent system structure. The problem of item (1) is solved by expressing explicitly the energy form such as heat, and so on. To get rid of the problem of item (2), the strucuture-function and structure models are added to a MFM model. A four layrs design model composed of goal, function-goal, function-structure, and structure models are proposed.An interface system is developed to make four layrs design models on a Smalltalk-80. The design information of a central heating system and a dust process system is expressed using the interface system. Through the expression trials, design information is confirmed to be expressed systematically and in well organized form. Moreover, it is shown that the difference of design intention is clearly expressed. A simple support system to assign structure to functions is also developed.The system behavior is derived from the system structure expressed in the four layrs design model by applying the Hybrid Phenomena (HPT) proposed by Woods and combining system structure model and numerical simulation programs. The HPT is extended to treat multiple models by introducing the factors of modeling ontologies proposed by Kiriyama. The effectiveness of the techniques of structure assignment to functions and behavior derivation is examined by a conceptual design of the central heating system.