From design principles to integreted computer aided design systems

In the paper the selected problems of the theory of machine design, formulated by prof Zbigniew Osinski, are presented. The important elements of this theory are design principles. General and particular design principles are formulated also in mathematical way. The second general design principle is formulated in mathematical way as a problem of optimisation. In the paper also problems of multi-objective optimisation and decomposition of optimisation problems are considered as a particular problems of optimisation. Design principles are becoming the key to integrated CAD systems. The idea of such CAD systems is presented. Problems of safety in machine design are also discussed as an example of design principle and integrated CAD system. The data bases are proposed to support safety problems in design process.