Wyniki wyszukiwania - BazTech

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Static and dynamic impact performance optimization of CFRP/Al bolt joint coupling structure-lay-up-connection parameters

Xu Wenchao, Wang Dengfeng

Archives of Civil and Mechanical Engineering

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2022

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Vol. 22, no. 3

art. no. e118

EN

Static shearing, drawing, and dynamic impact test schemes of carbon fber reinforced polymer (CFRP)/aluminum alloy (Al) bolt joint were designed. The fnite element model of the CFRP/Al bolt joint was established, and the failure modes of the joints under the static and dynamic impact conditions were analyzed. The structure, lay-up, and connection parameters of the joint were defned as design variables, and the static and dynamic impact performance indicators of the joint and the lay-up numbers of the CFRP sheet were defned as optimization objectives. Integrated multiobjective optimization was conducted for joints, employing the radial basis function neural network (RBFNN) surrogate model, elitist nondominated sorting genetic (NSGA-II) algorithm, and entropy-technique for order preference by similarity to ideal solution (E-TOPSIS) decision method. The best trade-of solution was obtained, and the optimal design variables were determined. The optimized joint was fabricated, and static and dynamic impact tests were carried out. The test and simulation results were compared to verify the efectiveness of simulation and optimization.

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Przemiany strukturalne systemów HVAC w budynkach przyszłości

Szczechowiak E.

Ciepłownictwo, Ogrzewnictwo, Wentylacja

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2015

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T. 46, nr 1

30--36

PL

W artykule przedstawiono spodziewane kierunki zmian w budownictwie, prowadzące do budynków zrównoważonych i o prawie zerowym zapotrzebowaniu na energię. Prowadzi to nieuchronnie do zmian obciążeń cieplnych i chłodniczych dla warunków obliczeniowych i w ciągu roku. Te tendencje wymuszają zmianę podejścia do filozofii projektowania i konfigurowania oraz sterowania systemów HVAC (ogrzewania, wentylacji i klimatyzacji).

EN

The paper presents the expected trends in construction, leading to the building of sustainable and close to zero energy demand. This leads inevitably to changes in heating and cooling loads for the conditions and within a year of account. These trends necessitate a change in approach to the philosophy of design and configuration, and control systems for HVAC (heating, ventilation and air conditioning).

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An approach towards fully integration of CAD and CAM technologies

Tolouei-Rad M.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 18, nr 1-2

31--36

EN

Purpose: An integrated CAD/CAM system for milling operations has been developed which helps designers to solve machining problems at the design stage. Design/methodology/approach: A methodology has been employed which provides all necessary information for machining products automatically. Use of these system results in reduced machining leadtimes and cost through designing machinable components; using available cutting tools; improving machining efficiency. The system is menu driven with a user friendly interface. Findings: Different components for developing such a system have been identified and various problems that arose in the development of this system have been dealt with The system developed leads to an adequate basis for fully integration of CAD and CAM technologies in one system. It allows simultaneous generation of all information required to satisfy machining requirements of the design such as its machinability and availability of the required tooling resources. Research limitations/implications: Different components required for developing such systems have been identified and various problems that arose in the development of these systems have been dealt with, leading to an adequate basis for complete integration of CAD and CAM technologies. Although much of the work described here goes beyond the scope of published literature, however, it should be noted that the system developed couldn’t be considered as a complete solution to the CAD/CAM integration problem. Further work requires including other manufacturing activities that are considered in concurrent engineering concept. In this direction, further integration of the system developed with systems such as MRP, MRP II and assembly sequence planning packages are highly desirable. Originality/value: CAD/CAM integration is regarded as a solution for bridging the gap between design and manufacturing, one of the ultimate goals for concurrent engineering. Since the advent of CAD and CAM numerous attempts have been made to integrate these technologies; however, a full CAD/CAM integration is not yet achieved. In addition, most of the systems developed focus only on turning, leaving room for further investigation on other machining operations including milling. This paper goes one step closer towards achieving a full CAD/CAM integration for milling operations.