Wyniki wyszukiwania - BazTech

1

Design of complex induction hardening problems by means of numerical simulation

Nacke B., Wrona E.

Archives of Electrical Engineering

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2005

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Vol. 54, nr 4

461-466

EN

The paper describes a numerical method for solving complex induction hardening tasks. The numerical simulation tool, which enables the 3D calculation of the transient heating process, is explained in detail. The use of the simulation tool is shown for the application of induction hardening of worms for worm-gears. Results for single frequency process and innovative simultaneous dual frequency heating are presented. Moreover, experimental results show the accuracy of the numerical calculation. First results of coupling the numerical simulation tool with an optimisation algorithm in order to carry out an automatic optimisation are described, too. The conclusion shows that numerical simulation tools are very helpful for solving complex induction hardening tasks.

PL

W pracy opisano metodę numeryczną rozwiązywania złożonych zagadnień hartowania indukcyjnego. Omówiono szczegółowo oprogramowanie do symulacji komputerowej umożliwiające obliczenie niestacjonarnego trójwymiarowego procesu nagrzewania. Użycie narzędzia symulacyjnego zademonstrowano dla przypadku hartowania indukcyjnego ślimaków przekładni ślimakowych. Przedstawiono wyniki dla procesu jednoczęstotliwościowego oraz nowoczesnego procesu równoczesnego hartowania dwuczęstotliwościowego. Dodatkowo wyniki doświadczalne potwierdziły dokładność obliczeń numerycznych. Opisano także pierwsze wyniki dla przypadku sprzężenia narzędzia symulacyjnego z algorytmem optymalizacyjnym, którego celem było prowadzenie automatycznej optymalizacji. We wnioskach stwierdzono, że symulacja numeryczna stanowi użyteczne narzędzie do rozwiązywania złożonych zagadnień hartowania indukcyjnego.

2

The influence of population genetics for the redesign of genetic algorithms

Affenzeller M., Wagner S.

Systems Science

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2004

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Vol. 30, no 4

41-49

EN

This contribution considers recent results of population genetics in order to present generic extensions to the general concept of a Genetic Algorithm (GA). Consequently a new model for self-adaptive selection pressure steering is presented (Offspring Selection), taking advantage of the interplay between directed genetic drift and selection, resulting in a new class of Genetic Algorithms. As a result, we introduce and empirically analyze the generic extensions to the general GA concept, which make genetic search more stable in terms of operators, and allows steering and scaling up of global solution quality to the highest quality regions without using problem specific information or local searches.

3

User-friendly system PROJMAT 2001 for deterministic optimisation of small commutator motors

Puternicki P., Sulima R.

Journal of Technical Physics

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2002

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Vol. 43, no 4

459-465

EN

System PROJMAT 2001 is used for designing small commutator motors. The software in the Matlab 5.0 and the Toolbox Optimisation is used for multicriterial optimisation. The software has an interface which is constructed of elements and functions in the Uitools package of the Matlab. The interface is build on the basis of a series of windows which enables the data segregation and communication with the user. It gives a possibility of an easy and comprehensible preparation of all input technical data and constraints. The main parts of the system are: the optimisation block, the postprocessor block and controlling over them the interface block. The example of small motor design is given in this paper.

4

Material derivative technique in optimal design

Kwiatkowska A., Krawczyk A., Sikora J.

Journal of Technical Physics

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2002

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Vol. 43, no 4

427-431

EN

The paper deals with the problem of shape design, and the shape has to ensure the assumed distribution of the function. The concept of material (substantial) derivative has been employed in order to solve the problem. The numerical model was based on the Finite Element Analysis. The quoted results show that the method of optimisation is effective for the problem of shape design.

5

Collision situation of objects afloat as multiple complex motion

Żak B.

Journal of Technical Physics

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2002

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Vol. 43, no 1

81-90

EN

The paper presents a mathematical model of a collision situation of objects afloat. To describe it, the rules of a multiple complex motion were used. The paper contains also an analysis of the model presented and the conclusions drawn from it.