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This article deals with an approach for demand modeling when designing size ranges of technical products. The proposed modeling approach is a stage of the size ranges optimization problem, and by it information can be obtained regarding the requested sizes and their respective quantities (demand). The approach is comprised of four main stagesmarket segmentation and choice of potential customers, collecting demand data, description and processing of the collected data, and determination of a demand model. The approach is applied for the demand modeling of a particular product -pneumatic modules for linear motion. In the analysis of the market research data the procedures of principle component analysis, factor analysis and regression by principal components are used. The study is carried out in the environment of STATGRAPHICS and SPSS.

The choosing of a structural variant, is one of the main problems solved during the design process of complex technical systems. The real world conditions demand this choice to be made, on the basis of a set of criteria, which in the general case are conflicting. In the present paper are given the results, from the development of an interactive software system for multicriteria optimization, aiding the designers of technical products, during the decision making process of choosing of a structural variant. While developing the software system, the specifics of the problem have been taken into account. An effort has been made, for avoiding the disadvantages of similar, already known software systems. The application of the development is illustrated with a solved example.

The paper presents the results from a research on parts used in mechatronic products and produced by the permanent-mold casting methods of gravity die casting and die casting. An overview and analysis of different definitions for mechatronic systems and examples of mechatronic products is made. As a result, a new definition for a mechatronic product is proposed. Various classifications of mechatronic products are analysed and deemed too general for the purposes of the current research. Permanent-mold casting methods are analysed and their advantages and disadvantages are pointed out. Arguments as to why these methods are suitable for producing mechatronic product parts are given. Based on the proposed definition for mechatronic product, the analysed classifications, and the overview of the permanent-mold casting methods a new classification is proposed. The classification is used for classifying permanent-mold cast parts used in mechatronic products. The parts are classified in six groups with regard to their application in the mechatronic product. In addition, the classification gives information regarding permanent-mold casting method used, material, and mechatronic product that includes the part.