Abstract
A new type CAD system for control system analysis and design has been developed on a workstation, which is written in Smalltalk-80, an object oriented language, combined with C and Lisp. The system has the following features: 1) The system can aid designer not only for numerical computation served in the conventional CAD systems but also for symbolic manipulation and knowledge processing. Since these all facilities are integrated in the uniform Smalltalk environment, the system can provide the advanced functions, and then the designer can conduct almost all operations required for analysis and design.2) The system is based on the concept of “virtual environment for analysing and designing control system”, which can provide an environment very close to real situation using real instruments. The object oriented programming paradigm is useful in making this environment. 3) The system has user friendly interface with multiwindow and mouse.
