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Wyszukujesz frazę "design optimisation" wg kryterium: Wszystkie pola


Tytuł:
Hybrid approach to design optimisation: Preserve accuracy, reduce dimensionality
Autorzy:
Kamola, M.
Powiązania:
https://bibliotekanauki.pl/articles/911244.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
optymalizacja konstrukcji
optymalizacja oparta na symulacji
model zastępczy
analiza awarii
design optimisation
simulation optimisation
surrogate model
analysis failure
Opis:
The paper proposes a design procedure for the creation of a robust and effective hybrid algorithm, tailored to and capable of carrying out a given design optimisation task. In the course of algorithm creation, a small set of simple optimisation methods is chosen, out of which those performing best will constitute the hybrid algorithm. The simplicity of the method allows implementing ad-hoc modifications if unexpected adverse features of the optimisation problem are found. It is postulated to model a system that is smaller but conceptually equivalent, whose model is much simpler than the original one and can be used freely during algorithm construction. Successful operation of the proposed approach is presented in two case studies (power plant set-point optimisation and waveguide bend shape optimisation). The proposed methodology is intended to be used by those not having much knowledge of the system or modelling technology, but having the basic practice in optimisation. It is designed as a compromise between brute force optimisation and design optimisation preceded by a refined study of the underlying problem. Special attention is paid to cases where simulation failures (regardless of their nature) form big obstacles in the course of the optimisation process.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2007, 17, 1; 53-71
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design optimisation of the deep trench termination for superjunction power devices
Autorzy:
Noblecourt, S.
Morancho, F.
Isoird, K.
Austin, P.
Tasselli, J.
Powiązania:
https://bibliotekanauki.pl/articles/398001.pdf
Data publikacji:
2015
Wydawca:
Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
Tematy:
deep trench termination
field plate
superjunction
breakdown voltage
napięcie przebicia
Opis:
Among the numerous solutions developed to improve the voltage handling capability of superjunction power devices, the Deep Trench Termination (DT2) is the most adapted thanks to its lower cost and size compared to other technologies using the multiple epitaxy technique, and an easier implementation in the fabrication process. This paper presents the optimization of the Deep Trench Termination by means of TCAD 2D and 3D-simulations allowing the realization of deep trench superjunction devices (diodes and MOS transistors) for 1200 V applications. The work is focused on the influence of the dielectric passivation layer thickness and the field plate length on the breakdown voltage of a DT-SJDiode.
Źródło:
International Journal of Microelectronics and Computer Science; 2015, 6, 4; 117-123
2080-8755
2353-9607
Pojawia się w:
International Journal of Microelectronics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of a genetic algorithm for design optimisation of a passive magnetic gear
Autorzy:
Kowol, M.
Kołodziej, J.
Łukaniszyn, M.
Powiązania:
https://bibliotekanauki.pl/articles/97369.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
magnetic gear
finite element method
evolutionary algorithm
Opis:
This paper analyzes an influence of selected design parameters of a passive magnetic gear on the transmitted torque density. This constitutes the basis for determination of a number of design parameters and their ranges in the optimisation process. Calculations are carried out using the two–dimensional finite element method implemented in the Matlab environment. As a result of the optimisation process, the design parameters of the magnetic gear with a much higher value of the transmitted torque are obtained.
Źródło:
Computer Applications in Electrical Engineering; 2016, 14; 220-230
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zagadnienia optymalizacji konstrukcji diod laserowych dużej mocy
High power laser diodes - design optimisation issues
Autorzy:
Malag, A.
Powiązania:
https://bibliotekanauki.pl/articles/192142.pdf
Data publikacji:
2007
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Materiałów Elektronicznych
Tematy:
dioda laserowa dużej mocy
konstrukcja diod laserowych dużej mocy
optymalizacja wiązki promieniowania
high power laser diodes
high power laser diodes construction
Opis:
Artykuł zawiera skrótowy przegląd aktualnych osiągnięć w dziedzinie konstrukcji diod laserowych (DL) dużej mocy. Zakres artykułu ograniczony został do zagadnień optymalizacji heterostruktury ze względu na parametry, które wydają się najważniejsze dla przyrządów dużej mocy takie, jak sprawność energetyczna (PCE), próg katastroficznej degradacji luster (COD) i jakość emitowanej wiązki promieniowania (M2 i rozbieżność). Przedstawione wyniki (przodujących instytutów i ITME) wskazują, że jednoczesna maksymalizacja wszystkich tych parametrów jest bardzo trudna. Wyniki "rekordowe" są bardzo zróżnicowane ze względu na długość fali i grupę materiałową (arsenki, fosforki).
Current achievements in the field of high-power laser diodes (LD) construction are briefly presented. The scope has been limited to issues of heterostructure optimisation in terms of the parameters the most important for high power devices, such as power conversion efficiency (PCE), COD level and an emitted beam quality (M2 and divergence). Presented results (of leading laboratories and ITME) indicate that simultaneous maximisation of these parameters is very difficult. There is a wide diversity of the record-high attainments in terms of preferred design solutions and due to different wavelengths and material systems.
Źródło:
Materiały Elektroniczne; 2007, T. 35, nr 1, 1; 21-46
0209-0058
Pojawia się w:
Materiały Elektroniczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model i optymalizacja konstrukcji wielofunkcyjnego czujnika ciśnienia krwi
Modeling and Design Optimisation of Multifunctional Blood Pressure Sensor
Autorzy:
Werszko, Mirosław
Tomczuk, Krzysztof
Werszko, Radosław
Powiązania:
https://bibliotekanauki.pl/articles/277851.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
pomiar ciśnienia krwi
pneumatyczny czujnik ciśnienia
komparacyjna metoda pomiaru
wzmacniacz pneumatyczny typu dysza-przysłona
odpowietrzanie pierścieniowe
blood pressure measurement
pneumatic pressure sensor
comparative method of measurement
nozzle-flapper pneumatic amplifier
sensor with ring venting
Opis:
Przedstawiono model symulacyjny pneumatycznego czujnika typu dotykowego, przeznaczonego m.in. do bezinwazyjnego pomiaru skurczowego i rozkurczowego ciśnienia krwi. Pomiar tych wielkości odbywa się metodą komparacyjną: zmiany ciśnienia krwi, przenoszone przez ścianę tętnicy i skórę na zewnętrzną stronę membrany czujnika, porównywane są z ciśnieniem na jej wewnętrznej stronie, wywieranym przez sprężone powietrze, którego ciśnienie zmienia się liniowo z prędkością 3 mmHg/s. Zrównanie się chwilowych wartości tych ciśnień powoduje spłaszczenie membrany, która na moment otwiera kanał odpowietrzający, gdy jest on zamknięty lub go zamyka, gdy jest otwarty. Chwilowe otwarcia lub zamknięcia kanału powodują załamania regularnego przebiegu ciśnienia porównawczego, przy czym pierwsze i ostatnie z tych załamań określają wartości mierzonych ciśnień. W wyniku badań modelu czujnika, dotychczasowy liniowy przebieg ciśnienia porównawczego został zastąpiony przez przebieg łamany, dzięki czemu zminimalizowano błędy pomiaru ciśnień oraz czasy trwania samego pomiaru (kryteria optymalizacji). Ponadto uproszczono proces pozycjonowania czujnika na ciele badanej osoby: zastosowano czujnik z pierścieniowym odpowietrzaniem zamiast z odpowietrzaniem centralnym, który był stosowany dotychczas.
The paper presents a simulation model of a pneumatic tactile sensor, intended, among others, for non-invasive measurement of systolic and diastolic blood pressure. These values are measured using the comparative method: changes in blood pressure transferred through the artery wall and skin to the outside of the sensor membrane are compared with the pressure on its inside, exerted by compressed air, the pressure of which changes linearly at a rate of 3 mmHg/s. The equalization of the instantaneous values of these pressures causes the flattening of the diaphragm, which momentarily opens the venting channel when it is closed or closes it when it is open. Momentary openings or closings of the channel cause breaks in the regular course of the comparative pressure, the first and last of these breaks determining the values of the pressures measured. As a result of testing the sensor model, the previous linear course of the comparative pressure was replaced by a broken run, thanks to which pressure measurement errors and the duration of the measurement itself were minimised (optimisation criteria). In addition, the process of positioning the sensor on the body of the test person was simplified: a sensor with ring venting was used instead of the central venting that had been used so far.
Źródło:
Pomiary Automatyka Robotyka; 2020, 24, 3; 5-10
1427-9126
Pojawia się w:
Pomiary Automatyka Robotyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and optimisation of main rotor for ultralight helicopter
Autorzy:
Stalewski, W.
Powiązania:
https://bibliotekanauki.pl/articles/243641.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
rotorcraft
ultralight helicopter
main rotor
airfoil
computer-aided design
optimisation
Opis:
A modern main rotor, dedicated to the ultralight helicopter, has been designed and optimised. Due to assumed simplicity of the rotor design and taking into account some technological constraints, the principal purpose of the presented research was to design a dedicated airfoil which, when applied on the main-rotor blades, would influence satisfactory improvement in a performance of the ultralight helicopter, especially in fast flight. The design and optimisation process has been supported by a computational methodology. The in-house software has been used for direct and inverse design of shapes of the rotor-blade airfoils. Aerodynamic properties of the airfoils as well as the helicopter main rotor were evaluated based on both the two-dimensional and three-dimensional flow simulations conducted using the ANSYS FLUENT software that was used to solve U/RANS equations. Based on the results of conducted computational simulations of fast flight of the ultralight helicopter, it can be concluded that the newly designed main rotor, compared to the baseline, may give certain improvement in helicopter performance in fast flight. In addition, the application of this newly designed rotor may lead to increase of a maximum speed of the helicopter flight, due to the greater lift force achievable by this rotor on the retreating blade, which is favourable from point of view of keeping of a lateral balance of the helicopter in fast flight.
Źródło:
Journal of KONES; 2017, 24, 4; 287-295
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and optimisation of exhaust system of light turboprop airplane
Autorzy:
Stalewski, W.
Powiązania:
https://bibliotekanauki.pl/articles/247804.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
turboprop aircraft
exhaust system
ejector
computer-aided design
optimisation
Opis:
Innovative exhaust system for light turboprop airplane has been developed and optimised. Apart from the basic function of removing exhaust from turboprop engine, the system supports cooling of the engine bay. To do this, the system removes hot air from the engine bay, utilising the ejector-pump effect, where the exhaust stream generates under-pressure, sucking the hot air through the ejector slot and removes the air together with the exhaust gases. The design and optimisation of the exhaust system has been conducted based on computational methods of Computer-Aided Design and Optimisation and Computational Fluid Dynamic. Three-dimensional analysis of flow around the airplane (including effect of propeller) and inside the exhaust system was conducted by application of URANS solver ANSYS FLUENT. Using these software the trajectories of exhaust particles, both inside the exhaust ducts and outside the airplane, have been determined. Parametric model of the designed exhaust system has been developed using the in-house software PARADES. As design parameters the diameter, length and direction of exhaust ducts as well as few parameters describing a shape of the ejector, have been established. The optimisation process aimed at designing of the exhaust system, which removes the exhaust gases possibly far away from the airframe, especially during a descent flight of the airplane. Additional objectives were maximisation of the mass flow rate of hot air sucked through the ejector and minimisation of the drag force generated by external part of the exhaust system. The optimised exhaust system should have also fulfilled requirements of permissible total-pressure losses inside the exhaust ducts. The optimised exhaust system has been implemented on the light turboprop airplane and validated during flight tests.
Źródło:
Journal of KONES; 2016, 23, 2; 341-348
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computational design and optimisation of innovative, high-efficiency wind turbine
Autorzy:
Stalewski, W.
Zalewski, W.
Powiązania:
https://bibliotekanauki.pl/articles/246604.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
green power
wind turbine
computational fluid dynamics (CFD)
computer-aided design
optimisation
Opis:
New concept of innovative, high-efficiency wind turbine has been developed and optimised. The turbine consists of a rotor with a vertical axis of rotation and a ring-palisade casing, which task is to deflect wind stream so that it flows perpendicularly to the rotor plane. The main advantage of such configuration of a wind turbine is that due to the vertical axis of symmetry, it works independently on the wind direction and it does not need any mechanism directing it towards the wind. The greatest challenge when designing the turbine was to minimise losses of energy of the wind stream deflected by 90 degrees by the ring vanes of the casing. This involved optimisation of number, shapes and mutual positions of the ring vanes. The whole optimisation works were done based on computational methods of Computer-Aided Design and Optimisation and Computational Fluid Dynamic. Subsequent variants of the ring-palisade casing were designed using an appropriately adapted in-house-software package supporting design and optimisation of multi-element airfoils. Three-dimensional analysis of flow around and inside the casing was conducted by application of commercial URANS solver ANSYS FLUENT. Eventually designed turbine is characterised by high efficiency in respect of acceleration of the wind stream. On the basis of computer simulations, it is estimated that the average velocity of air stream flowing through the rotor plane may be higher than the wind speed by about 45%. Extent of the acceleration of the wind stream partially depends on the number of ring vanes comprising a casing. Depending on specificity of application, this number of ring vanes may be chosen by a compromise between performance and dimensions of the turbine. The proposed wind turbine seems to be very promising solution, especially within the area of small and moderate renewable-energy sources, which in particular may be placed directly in residential-building areas, e.g. on the roofs of houses. This type of renewable-energy sources may also be successfully used in the field of environmentally friendly transport, in the process of producing hydrogen as fuel for fuel cell vehicles.
Źródło:
Journal of KONES; 2015, 22, 2; 221-232
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic algorithm as a tool for multi-objective optimization of permanent magnet disc motor
Autorzy:
Cvetkovski, G.
Petkovska, L.
Powiązania:
https://bibliotekanauki.pl/articles/141012.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
design optimisation
electric vehicle
genetic algorithm
multi-objective optimisation
permanent magnet disc motor
Opis:
The analysed permanent magnet disc motor (PMDM) is used for direct wheel drive in an electric vehicle. Therefore there are several objectives that could be tackled in the design procedure, such as an increased efficiency, reduced iron weight, reduced copper weight or reduced weight of the permanent magnets (reduced rotor weight). In this paper the optimal design of PMDM using a multi-objective genetic algorithm optimisation procedure is performed. A comparative analysis of the optimal motor solution and its parameters in relation to the prototype is presented.
Źródło:
Archives of Electrical Engineering; 2016, 65, 2; 285-294
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Small Area Estimation in the German Census 2011
Autorzy:
Münnich, Ralf
Burgard, Jan Pablo
Gabler, Siegfried
Ganninger, Matthias
Kolb, Jan-Philipp
Powiązania:
https://bibliotekanauki.pl/articles/465802.pdf
Data publikacji:
2016
Wydawca:
Główny Urząd Statystyczny
Tematy:
register-assisted census
small area estimation
design optimisation
relative root mean squared error
Opis:
In 2011, Germany conducted the first census after the reunification. In contrast to a classical census, a register-assisted census was implemented using population register data and an additional sample. This paper provides an overview of how the sampling design recommendations were set up in order to fulfil legal requirements and to guarantee an optimal but still flexible source of information. The aim was to develop a design that fosters an accurate estimation of the main objective of the census, the total population counts. Further, the design should also adequately support the application of small area estimation methods. Some empirical results are given to provide an assessment of selected methods. The research was conducted within the German Census Sampling and Estimation research project, financially supported by the German Federal Statistical Office.
Źródło:
Statistics in Transition new series; 2016, 17, 1; 25-40
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł

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