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Wyświetlanie 1-15 z 423
Tytuł:
Proposal of gearbox design method with lowered vibroactivity
Autorzy:
Figlus, T.
Wilk, A.
Folęga, P.
Powiązania:
https://bibliotekanauki.pl/articles/243955.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
gearbox
vibroactivity
simulation
Opis:
Research of vibroactivity of the means of transport, in particular of the gearbox, has become of significant importance in the recent years. Reducing of their environmental nuisance consists primarily of reducing the noise and vibration levels. Research of this type is currently conducted using simulation models, which is economically justified. The results of these studies may be a basis for the design of a gearbox with lowered vibroactivity. The paper presents a proposal of the design method of a gearbox with lowered vibroactivity. The basis for the method consists of dynamic models of the gearbox in the transmission system and FEM models of different design solutions of ribbed housing, which are the main source of vibration and noise emitted by the gearbox. It follows from previous research that the housing is excited to vibrate in bearing nodes by the dynamic load and vibration generated in meshing, that are transmitted through shafts to the bearings. Taking into account the mechanizm described, it is assumed in the proposed method that a design of a gearbox with lowered vibroactivity is possible through a proper selection of the gears geometry, so as to assure a reduction of dynamic load of the gears, and of the location and dimensions of additional ribbing of the housing, with maintaining the lowest possible weigh of the housing. In the paper, the housing vibroactivity measure has been assumed and characterized, which is used in the evaluation of several engineering solutions of the gearbox housing.
Źródło:
Journal of KONES; 2010, 17, 3; 87-92
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design method of products processes for group technology
Autorzy:
Mleczko, J.
Powiązania:
https://bibliotekanauki.pl/articles/99585.pdf
Data publikacji:
2012
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
group technology
mass customization
costs
product family
manufacturability
Opis:
In contrast to the traditional manufacturing system, where the basic features are low product variety and mass production, recent manufacturing environment is characterized by shorter product life cycles, constantly diminishing batch sizes while the variety of product types and models continues to increase. In high-variety manufacturing , in spite of applying modern management techniques, setup time still plays an important part in the production cycle time. Product development teams use many methods and tools for design, test, and manufacture a new or improved product. Design for manufacturing methodologies are used to improve a product's manufacturability. For high-variety production the cumulative amount of setup time results from the number of changeovers. To shorten the production time and therefore cost the methods of group technology (GT) are used. This paper presents a method of increasing the manufacturability of elements produced in GT. The method was validated in the conditions of best practice production for high-variety production.
Źródło:
Journal of Machine Engineering; 2012, 12, 3; 7-19
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A stability based neural networks controller design method
Autorzy:
Song, J.
Xu, X.
He, X.
Powiązania:
https://bibliotekanauki.pl/articles/206120.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
sieć neuronowa
stabilność
sterowanie nieliniowe
neural networks control
nonlinear control
sliding mode
stability
Opis:
The use of neural networks in control systems can be seen as a natural step in the evolution of control methodology to meet new challenges. Many attempts have been made to apply the neural networks to deal with non-linearities and uncertainties of the control systems. Research in neural network applications to control can be classified according to the major methods depending on structures of the control system, such as NN-based NON-linear System Identification, NN-based Supervised Control, NN-based Direct Control, NN-based Indirect Control, NN-based Adaptive Control, NN-based Self-learning Control, NN-based Fuzzy Control, and NN Variable Structure Control. All these control methods cannot, however, effectively guarantee system stability, i.e. none of these neural network controls, except for NN-based Variable Structure Control, is based on system stability. This also limits the application and development of the neural networks in control theory. The paper shows the effort to solve this difficulty and give a way for the design method of the stability based neural networks controller using Lyapunov second stability theorem. This kind of controller can not only guarantee system stability, but also fully compensate for the influence of system uncertainties and non-linearities.Simulation results also show the effectiveness of the controller.
Źródło:
Control and Cybernetics; 1998, 27, 1; 119-133
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Patient-specific graft design method for cranofacial surgical planning
Autorzy:
Król, Z.
Chlebiej, M.
Zerfass, P.
Zeilhofer, H.-F.
Sader, R.
Mikołajczak, P.
Keeve, E.
Powiązania:
https://bibliotekanauki.pl/articles/332956.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
komputerowe wspomaganie operacji
planowe przecinanie kości
przeszczep autologiczny
projekt transplantacji
dopasowania środka podobieństwa
witryna dawcy
optymalizacja
computer-aided surgery
osteotomy planning
autologous grafts
transplant design
matching similarity measure
donor site
optimization
Opis:
This paper presents a method for computer assisted selection of optimal donor sites for autologous osseous grafts in the craniofacial surgery. At the initial graft design stage the surgeon defines in the CT data set the shape of the bone segment to be reconstructed and in the donor region CT data set a set of constraints for the optimization task. This non-automatic step is followed by a fully automatic optimization stage, which delivers a set of sub-optimal and optimal donor sites for a given template. Such approach permits the surgeon to find the best site for harvesting the graft and enables an exact anatomical reconstruction of the osseous section.
Źródło:
Journal of Medical Informatics & Technologies; 2002, 3; MI189-197
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability optimization design method based on multi-level surrogate model
Autorzy:
Li, Yong-Hua
Liang, Xiao-Jia
Dong, Si-Hui
Powiązania:
https://bibliotekanauki.pl/articles/1841935.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
Kriging model
reliability-based optimization
multi-level surrogate model
adaptive dynamic penalty function
Opis:
In this work, a genetic-algorithm-based Kriging model with multi-point addition sequence optimization strategy is addressed to make up for the shortcomings of Kriging model with single point criterion. This approach combines the multi-point addition strategy with genetic algorithm to enable the Kriging model to efficiently capture the globally optimal solution. Based on this, a multi-level surrogate method is presented by employing a local surrogate model to modify the Kriging global surrogate model, and then applied to design optimization to improve the accuracy and efficiency of global optimization. Meanwhile, a reliability design optimization method based on multi-level surrogate model is studied by dealing with the reliability constraints with an adaptive reliability penalty function. Numerical examples show that the proposed method can find the optimal solution of the object problem with the least calculation cost under the condition of satisfying the reliability constraint.
Źródło:
Eksploatacja i Niezawodność; 2020, 22, 4; 638-650
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Describing of generalized drying kinetics with application of experiment design method
Autorzy:
Efremov, G.
Powiązania:
https://bibliotekanauki.pl/articles/297823.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
experiment design method
drying kinetics
modified two-period model
sludge
cotton fabric
Opis:
The purpose of this article is an application of experiment design method for describing of generalized drying kinetics. Generalized kinetic equation for the first drying period as the linear dependence of the material moisture content vs. drying time and temperature is obtained. For determination of generalized kinetic equation the limited number of experimental data (only two moisture contents of a material for two temperatures of drying agent) is needed. The comparison of calculations of generalized kinetic equation with experimental data for convection drying of sludge and for convectional drying of cotton fabric in the first drying period are fulfilled. The mathematical modification of the two-period model of drying kinetics over the entire drying process is obtained. This modified model permits to avoid of the determination of a characteristic drying time. The comparison of drying kinetic calculations with experimental data for convection drying of sludge in the first and second drying periods for four temperatures using of experiment design method was fulfilled. As follows from calculations, the experimental data of sludge correspond well to the lines obtained through the factorial design which means that this method can successfully be used to determine constant drying rates, total kinetics and the influence of temperature in drying process.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2013, 16(4); 309-322
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design method of winch driven by contactless magnetic coupling under deepwater
Autorzy:
Zhang, B.
Wang, Z.
Wang, T.
Yu, H. J.
Powiązania:
https://bibliotekanauki.pl/articles/258870.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
magnetic coupling
winch
graph analysis
CAD
Opis:
Through the combination subject of scientific research, the design method of the winch driven by contactless magnetic coupling is researched for the core purpose of the turning shaft sealing in a deepwater environment. This method has six design phases, including domestic and foreign information query and retrieval, graphic analyses of relevant structures, innovative design of 2D assembly sketches, a theoretical computation of structure parameters, the 3D modeling and motion simulation and engineering drawing. This method is of generality, which can provide examples for the postgraduate students and engineering personnel in self-renovation design of scientific research.
Źródło:
Polish Maritime Research; 2015, S 1; 95-99
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Survey design method – the key component of building the Polish Biobanking Network
Autorzy:
Paluch, Angelika
Chróścicka, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1197572.pdf
Data publikacji:
2021-05-25
Wydawca:
Gdański Uniwersytet Medyczny
Tematy:
biobank
biobanking
data
survey
survey design
Opis:
The Polish Biobanking Network was created to connect Polish biobanks and gain information about their collections, thus facilitating their cooperation both in the national and international area. Based on MIABIS (Minimum Information About BIobank data Sharing) and considering the specificity of the Polish scientific community, two surveys were created. The aim of the first survey was to collect general information about Polish biobanks, e.g. their localization and type of collected material. The second survey was more detailed and concerned the biobank’s structure, information about collected material, willingness to share the collected material, implementation of an informatics system. Significant information about Polish biobanks could be obtained through appropriate recognition of the biobank’s scope of practice and correctly asked questions. The analysis of collected results could give a full picture of Polish biobanks.
Źródło:
European Journal of Translational and Clinical Medicine; 2021, 4, 1; 65-70
2657-3148
2657-3156
Pojawia się w:
European Journal of Translational and Clinical Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of optical uniformity factors of backlight module using robust design method
Autorzy:
Wang, Ju-Chi
Fan, Yu-Cheng
Fang, Te-Hua
Tran, Anh-Son
Cheng, Yu-Ting
Powiązania:
https://bibliotekanauki.pl/articles/2060680.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
backlight module
uniformity
Taguchi method
LightTools
Opis:
In order to meet the advent of the high-definition liquid crystal display (LCD) era, in addition to the high-quality panel manufacturing technology, how the backlight module can provide a uniform backlight with higher uniformity for a better experience in viewing, is a very important and urgent issue. In this study, the 15.6-inch side-in backlight module was used as the benchmark, and the Taguchi method was applied to find the high uniformity. The matching of the fishbone diagram affects the optical uniformity factor of the backlight module, such as the size of the light guide plate dot, the color of the plastic frame, the color of the fixed gel of the light guide plate, and the difference of the reflection surface. The optical analog software LightTools is used according to the orthogonal table. The signal-to-noise (S/N) ratio of the average uniformity characteristics is obtained, then it is converted into the best response factor of the factor response table and the factor reaction diagram. The homogeneity at 13 points is as high as 90.12%, which is 4.72% higher than the original design factor. The contribution of the four factors to the uniformity can be obtained by using the variance analysis. Finally, the influence of each factor level on the uniformity is discussed.
Źródło:
Optica Applicata; 2022, 52, 1; 5--20
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The design of remote controlled bomb destruction robot implemented using mechatronics design method
Autorzy:
Ersoy, S.
Yilmaz, Ö.
Powiązania:
https://bibliotekanauki.pl/articles/386255.pdf
Data publikacji:
2008
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
robot zdalnie sterowany
mechatroniczne metody projektowe
mechatronics design method
remote controlled robot
Opis:
At the present day, the duration of product life is much shortened as a result of the customer demands changing rapidly and intensive competition. The customary design and production technologies have remained incapable against such hard conditions and consequently new concepts and methods have arisen. One of those concepts is “Mechatronics Engineering”. The mechatronics design method is based on an integrated approach to form the design eventuating in mainly match-purpose products instead of sequential design. The basic combination of the mechatronics approach is based on the usage of system model and simulation through prototype stages. The first step in development of the mechatronics systems is analyzing customer demands and the technical frame in which the system is combined. Generally the Mechatronics Design Process is rounded up the under seven mean headings. At the present day, remote controlled robotic systems are required for various purposes such as research, education, commerce etc. The target in this study is to design a remote controllable robot equipped with control capability with a robotic arm, to be developed following the Mechatronics Design Processes and used for the purpose of bomb defusing.
Źródło:
Acta Mechanica et Automatica; 2008, 2, 4; 11-15
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Blade section profile array lifting surface design method for marine screw propeller blade
Autorzy:
Król, Przemysław
Powiązania:
https://bibliotekanauki.pl/articles/259996.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
marine propeller
lifting surface
blade section profile
design
Opis:
The lifting surface model is widely used in screw propeller design and analysis applications. It serves as a reliable tool for determination of the propeller blade mean line and pitch distribution. The main idea of this application was to determine the blade shape that would satisfy the kinematic boundary condition on its surface with the prescribed bound circulation distribution over it. In this paper a simplified lifting surface method is presented – in which the 3D task for the entire blade is replaced by a set of 2D tasks for subsequent blade section profiles.
Źródło:
Polish Maritime Research; 2019, 4; 134-141
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integrated analytical-field design method of multi-disc magnetorheological clutches for automotive applications
Autorzy:
Kluszczyński, Krzysztof
Pilch, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/2086881.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electromechanical convertor
drive system component
electromagnetic calculations
MR fluids
magnetorheological fluids
MR multi-disc clutch
multi-disc magnetorheological clutch
clutch design
analytical field
design
przetwornik elektromechaniczny
element układu napędowego
obliczenia elektromagnetyczne
płyny MR
płyny magnetoreologiczne
wielotarczowe sprzęło magnetoreologiczne
sprzęgło wielotarczowe
projektowanie
Opis:
This study proposes a new integrated analytical-field design method for multi-disc magnetorheological (MR) clutches. This method includes two stages, an analytical stage (composed of 36 algebraic formulas) and a field stage based on the finite element method (FEM). The design procedure is presented systematically, step-by-step, and the results of the consecutive steps of the design calculations are depicted graphically against the background of the entire considered clutch. The essential advantage of the integrated method with this two-stage structure is the relatively high accuracy of the first analytical stage of the design procedure and the rapid convergence of the second field stage employing the FEM. The essence of the new method is the introduction of a yoke factor ky (the concept of which is based on the theory of induction machines) that determines the ratio of magnetomotive force required to magnetise the entire magnetic circuit of the clutch to the magnetomotive force required to magnetise the movement region. The final value, the yoke factor ky is determined using loop calculations. The simplicity of the developed design method predisposes its use in optimisation calculations. The proposed method can also be adapted to other MR devices analysed in shear mode.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 6; e139392, 1--15
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A robust controller design method and stability analysis of an underactuated underwater vehicle
Autorzy:
Chin, C. S.
Lau, M. W. S.
Low, E.
Seet, G. G. L.
Powiązania:
https://bibliotekanauki.pl/articles/908396.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
pojazd podwodny
stabilność
sterowanie odporne
symulacja
underwater vehicle
underactuated
stabilizable
robust controller
simulation
Opis:
The problem of designing a stabilizing feedback controller for an underactuated system is a challenging one since a nonlinear system is not stabilizable by a smooth static state feedback law. A necessary condition for the asymptotical stabilization of an underactuated vehicle to a single equilibrium is that its gravitational field has nonzero elements corresponding to unactuated dynamics. However, global asymptotical stability (GAS) cannot be guaranteed. In this paper, a robust proportional-integralderivative (PID) controller on actuated dynamics is proposed and unactuated dynamics are shown to be global exponentially bounded by the Sordalen lemma. This gives a necessary and sufficient condition to guarantee the global asymptotic stability (GAS) of the URV system. The proposed method is first adopted on a remotely-operated vehicle RRC ROV II designed by the Robotic Research Centre in the Nanyang Technological University (NTU). Through the simulation using the ROV Design and Analysis toolbox (RDA) written at the NTU in the MATLAB/SIMULINK environment, the RRC ROV II is robust against parameter perturbations.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2006, 16, 3; 345-356
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A matrix inequality based design method for consensus problems in multi-agent systems
Autorzy:
Zhai, G.
Okuno, S.
Imae, J.
Kobayashi, T.
Powiązania:
https://bibliotekanauki.pl/articles/930012.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
system wieloagentowy
konsensus
sterowanie zdecentralizowane
nierówność macierzy
LMI
multi-agent systems
consensus
decentralized control
graph Laplacian
matrix inequality
Opis:
In this paper, we study a consensus problem in multi-agent systems, where the entire system is decentralized in the sense that each agent can only obtain information (states or outputs) from its neighbor agents. The existing design methods found in the literature are mostly based on a graph Laplacian of the graph which describes the interconnection structure among the agents, and such methods cannot deal with complicated control specification. For this purpose, we propose to reduce the consensus problem at hand to the solving of a strict matrix inequality with respect to a Lyapunov matrix and a controller gain matrix, and we propose two algorithms for solving the matrix inequality. It turns out that this method includes the existing Laplacian based method as a special case and can deal with various additional control requirements such as the convergence rate and actuator constraints.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2009, 19, 4; 639-646
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Projektowanie parametryczne jako innowacyjna metoda w urbanistyce
Parametric planning as an innovative design method in urban design
Autorzy:
Nawrocka, A. A.
Powiązania:
https://bibliotekanauki.pl/articles/345086.pdf
Data publikacji:
2013
Wydawca:
Politechnika Krakowska im. Tadeusza Kościuszki. Wydział Architektury. Katedra Kształtowania Środowiska Mieszkaniowego
Tematy:
projektowanie parametryczne
cyfrowe narzędzia projektowania
urbanistyka parametryczna
parametric planning
digital parametric tools
parametric urbanism
Opis:
Artykuł dotyczy innowacyjnego podejścia do planowania przestrzennego uwzględniającego zdobycze współczesnej nauki i techniki, kiedy to procesy planowania miasta stają się niezwykle kompleksowe i wyrafinowane. Projektowanie urbanistyczne zajmuje szczególnie ważną pozycje w programach regeneracji miast. Doświadcza ono odejścia od pewnych uznanych niegdyś i cenionych reguł. Na scenie rozgrywającego się spektaklu urbanistycznego obserwujemy i wyczuwamy aktualnie napięcie i przyspieszony rozwój akcji. To szczególny moment, okres bez precedensu, gdy transformacje polityczne, nowe procesy ekonomiczne, nowe formy urbanizacji nasuwają pytanie o zdefiniowanie nowych koncepcji i strategii interwencji. W tym szczególnym momencie wzrasta znaczenie nowego stylu określanego mianem projektowania parametrycznego
The paper presents the innovative method in the field of urban planning which takes into account the achievements of modern science and technology at a time when the city planning processes become extremely complex and sophisticated. Urban planning is currently at a turning point taking a particularly important position in urban regeneration programs. It experiences a paradigm shift away from certain valued and once recognized urban clichés. We have a sense of a current tension and we are observing an accelerated plot development on the stage of the ongoing urban spectacle we are participating in. It is a special moment, an unprecedented period when the political transformation, new economical processes, new forms of urbanisation pose questions to define the new concepts and intervention strategies. In this particular moment increases the new style known as parametric design.
Źródło:
Środowisko Mieszkaniowe; 2013, 12; 15-17
1731-2442
2543-8700
Pojawia się w:
Środowisko Mieszkaniowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 423

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