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226 Dănuț Zahariea and Marius Stachie 3. The best combination of materials in terms of deflection is titan for passive layer and zinc for the active layer. Due to the smaller mechanical resistance of aluminum and zinc, increase the width of beams over a certain limit becomes dangerous, especially in the case of accidental temperature increases. 4. For all cases analyzed the maximum von Misses stress shall be recorded in the clamped area. Another critical area is the interaction area between the two beams of the bimetallic strip. Received: March 15, 2010 “Gh. Asachi” Technical University Department of Fluid Mechanics, Hydraulic Machines and Drives Iaşi, România email: dzahariea@yahoo.com email: marius_stachie@yahoo.com R E F E R E N C E S 1. D e m i a n T., Elemente constructive de mecanică fină. Ed. Didactică şi Pedagogică, Bucureşti, 1980. 2. Z a m a n i N.G., CATIA V5 FEA Tutorials. SDC Publications, 2005. ANALIZA STRUCTURALĂ A ARCURILOR BIMETALICE LAMELARE (Rezumat) În lucrare se prezintă analiza structurală a unui arc bimetalic lamelar utilizând mediul de analiză CATIA Generative Structural Analysis. Sunt analizate şase arcuri bimetalice lamelare având ca material pasiv titanul, iar ca material activ zincul, aluminiul, bronzul, alama, cuprul şi oţelul. Analiza numerică a fost efectuată pentru aceleaşi caracteristici globale (dimensiuni geometrice, condiţii pe contur şi sarcini) folosind doi parametri de control: lăţimea şi grosimea arcurilor lamelare. Sunt prezentate diagrame comparative pentru analiza influenţei materialului, a lăţimii şi grosimii arcurilor lamelare asupra deformaţiei maxime şi a stării de solicitare a arcurilor bimetalice analizate. Principalele concluzii sunt: sensibilitatea maximă se înregistrează pentru combinaţia de materiale titan-zinc; zonele puternic solicitate sunt încastrarea şi interfaţa dintre cele două lamele; tensiunile echivalente mai mari se înregistrează în stratul activ; lăţimea lamelelor influenţează în principal starea de solicitare, în timp ce lungimea acestora influenţează cu precădere valorile săgeţii maxime a arcului bimetalic lamelar.
BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică „Gheorghe Asachi” din Iaşi Tomul LVI (LX), Fasc. 2, 2010 Secţia CONSTRUCŢII DE MAŞINI KNOWLEDGE MANAGEMENT FOR THE CONFIGURATION IN EARLY PHASES OF COMPLEX CUSTOM PRODUCTS BY IRÈNE ALEXANDRESCU, HANS-JOACHIM FRANKE and THOMAS VIETOR Abstract. Nowadays, large and saturated markets in developed countries enforce the production of a broad palette of customized products, which satisfy the customers’ individual needs. In addition, interesting emerging markets together with the constraints of the current economic crisis lead to further differentiation in terms of product functionality and allowable costs. Furthermore, global markets also imply many different standards and norms, lately more strict due to the worldwide environmental concerns. In order to be effective in producing custom products, companies in the field of mechanical engineering integrate in their product lifecycle technologies the newest parametric CAD/CAM systems, as well as different software for the sales and design departments, such as configuration or calculation tools. However, producing high quality products with relatively short delivery times requires that a common knowledge base exists between the enterprise departments and clear processes and interfaces are defined, integrating all the used systems. This is commonly not the case and therefore unnecessary iterations are done in order to produce a technically correct offering based on the specific customer request. This paper discusses the need and some ideas for a better methodology to faster and better design complex custom products in the field of mechanical engineering. It explains the need for a structured knowledge base prior to the beginning of the new custom product design process. This knowledge base offers the necessary data for the early design phases and connects the sales and design departments by ensuring a correct and transparent information transfer between the customer requirements, the configuration software, the used parametric CAD tools and the generated customer specific offers. The result is a faster, optimized and technically correct basic configuration of custom products in early design phases. Key words: complex custom products, early design phases, product configuration, knowledge management. 1. Introduction The transfer from industrial to information and knowledge societies radically transformed the markets and increased customer expectations.
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