应用框架法的锅炉热力计算系统问题域模型

Problem domain model of boiler thermodynamic calculation system based on application frameworks

为了提高锅炉热力计算模型的通用性和系统的可维护性,提出面向对象应用框架的系统建模方法.基于模型为图结构的基本假定,根据受热面功能和物质流种类确定对象之间的继承关系,提取出单元和流一组抽象对象.在用抽象对象作为惟一元素构造出稳定的系统组织结构和应用框架后,从抽象对象派生出实例对象以实现框架和实例对象的分离.通过对象之间继承关系、逻辑关系和聚合关系的分析,设计了领域问题对象集、系统数据结构和应用框架,并讨论了系统的可扩充性.工程使用情况表明,按此模型开发的系统适应多种炉种和任意受热面布置的锅炉热力计算,具备良好可扩充性能.

For improving the versatility and extensibility of the boiler thermodynamic calculation system, a modelling method with object-oriented application frameworks was presented. Based on the assumption of model's graphic structure, the object inherit relationships were set up according to the functions of heat exchangers and types of material flows, and the abstract objects including unit and flow were extracted. System issues and application frameworks were constructed with abstract objects, and the instance objects were derived from the abstract objects to separate the frameworks with the instance objects. After analysis of inherit, logical and aggregation relationships among the objects, the object sets of problem domain, system data structure and application frameworks were designed, and the system extensibility was also discussed. Researches on the engineering example show that the system developed with this model is suitable for various kinds of boiler and any styles of equipment arrangement for the boiler thermodynamic calculation, and has good expansibility.