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1

Finite Element Analysis of Cold-Formed Steel Structural Members with Performations Subjected to Compression Loading

MacDonald M., Kulatunga M. P.

Mechanics and Mechanical Engineering

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2013

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Vol. 17, nr 2

127--139

EN

Numerical investigation on the behaviour of cold–formed thin–walled steel structural members with perforations is presented in this paper. Many structural cold–formed steel members are provided with cut–outs to accommodate electrical, plumbing, and heating services and so on. Due to the position of cut–outs, the elastic stiffness and ultimate strength of a structural member could be varied. The primary interest of this paper is to study the possible buckling occurrence on cold formed steel structural sections used as columns with perforations. Initially, a reliable finite element model was generated using the ANSYS software package to be able to predict the ultimate strength of cold–formed structural sections and to obtain a better understanding of the buckling failure behaviour highlighted, and conclusions will be drawn on this basis.

2

Machine noise - a practical approach to measurement with delay-and-sum beamforming

Maier C., MacDonald M., Harrison D., Pannert W.

Problemy Maszyn Roboczych

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2009

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Z. 33

37-46

EN

The first author is currently researching on a part-time basis for a Ph.D. in the field of aeroacoustics at Glasgow Caledonian University, but is employed by Aalen University of Applied Science in Germany. Beamforming is a method for determination of position sound sources via an acoustic camera by estimating the incident wave. This paper presents and describes in detail the fundamentals of delay-and-sum beamforming and the mathematics behind the algorithm to help, in part solve beamforming problems. It is recognised that other algorithms can be used to, but the motivation for this paper is based on the aim of comparing aeroacoustic measurements from an acoustic camera with different beamforrning algorithms and a CFD model calculation using the Fluent software package.

PL

Metoda kształtowania sygnału jest wykorzystywana do lokalizacji źródła sygnału dźwiękowego za pomocą kamery akustycznej poprzez analizę fal nadbiegających. W artykule przedstawiono i szczegółowo opisano podstawy matematyczne algorytmu metody kształtowania sygnału poprzez sumowanie sygnału głównego i opóźnionego, aby pomóc lub częściowo rozwiątzać problemy kształtowania sygnału. Inne algorytmy mogą być również stosowane w tym celu, jednakże celem tego artykułu jest porównanie pomiarów akustycznych za pomocą kamery akustycznej z różnymi algorytmami formowania sygnału, jak również analiza modelu komputerowej dynamiki przepływu z zastosowaniem pakietu Fluent.

3

Load-capacity of combined steel/aluminium members under bending action - experimental study

MacDonald M., Rhodes J., Kotełko M.

Mechanics and Mechanical Engineering

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2002

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Vol. 6, nr 2

41-47

EN

The analysis of the load-capacity and failure behaviour of combined steel/aluminium members subject to bending is presented in the paper. Members are formed from an extruded aluminium box-section into which a cold formed plain steel channel is inserted. The results of FE analysis both for an elastic and elasto-plastic-buckling stage are shown. Tests performed on cantilever beams with riveted and unriveted component members are described. The failure behaviour of the combined members under investigation is presented on the basis of FE results and experimental tests. The work is completed with a comparison of equivalent FE results, British Standard calculations and experimental work performed. An influence of riveting is discussed.

PL

W referacie przedstawiono analizę zagadnienia nośności granicznej i nośności w fazie zniszczenia cienkościennych prętów o przekroju złożonym. Pręt taki budowany jest z pręta aluminiowego o przekroju skrzynkowym, wewnątrz którego umieszczono stalowy ceownik zimno walcowany. Przedstawiono wyniki analizy metodą elementów skończonych (MES) w stanie sprężystym i sprężysto-plastycznym z uwzględnieniem wyboczenia. Opisano eksperyment przeprowadzony na belkach wspornikowych o przekroju złożonym, z elementami nitowanymi i nie nitowanymi. Przedstawiono zachowanie się badane] konstrukcji w fazie zniszczenia, na podstawie wyników analizy numerycznej MES, a także wyników eksperymentu. Przeprowadzono porównanie wyników MES z wynikami obliczeń według Normy Brytyjskiej (BS) i wynikami eksperymentu. Opisano wpływ nitowania na nośność graniczną konstrukcji.

4

An efficient information system for automated process planning

Pang J., Harrison D. K., MacDonald M.

Mechanics and Mechanical Engineering

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2002

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Vol. 6, nr 2

49-63

EN

Process planning is one of the most important components in manufacturing industry. It may be considered as a bridge between design and manufacturing. Tremendous efforts have been made to develop automated process planning systems during the last three decades. However, their effectiveness is stili far from satisfactory. Process planning is a very complicated and complex task. It not only requires a good deal of technique specific expertise and knowledge but also is very dependent on dynamic manufacturing resources. With the recent development in computer information systems, especially Artificial Intelligence (Al) and advanced modelling techniques, Computer Aided Process Planning (CAPP) has greatly benefited from the new information processing capabilities. By efficiently combining some of these techniques such as object-oriented techniques, deductive mechanisms, logic programming and fuzzy logic, an integrated and intelligent information representation is introduced to facilitate automatic process planning in this paper. It can effectively satisfy the requirements of representing the process planning information and also provide an open structure for the information exchange within the Computer Integrated Manufacturing (CIM) environment.