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1
Content available remote Traffic network design by cellular automaton-based traffic simulator
Kita E., Nanya W., Wakita Y., Tamaki T.
Computer Assisted Methods in Engineering and Science
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2015
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Vol. 22, no. 1
51--61
EN
Braess pointed out that adding a new road to overcome a traffic congestion could cause a new traffic congestion leading to the reduction of the traffic flow in the whole traffic network, which is called Braess’ paradox. The aim of this study is to formulate a traffic network design algorithm to increase the traffic flow in a traffic network. The objective function is the traffic flow of the whole traffic network and the route selection at the corners is considered as design variable. The traffic flow is estimated by a traffic flow simulator based on the cellular automaton model. A simple traffic network is considered as a numerical example. At different traffic densities, the traffic network is optimized to maximize the traffic flow. The results show that the optimized traffic network depends on traffic density. The situation presented by Braess’ paradox could disappear at high traffic density.
2
Content available remote Comparison of Magnetic Field and Iron Loss Models for 2-Dimensional Magnetic Anisotropic Properties
Wamija K., Tamaki T.
Przegląd Elektrotechniczny
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2011
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R. 87, nr 9b
24-28
EN
In numerical analysis of electromagnetic equipment that contains magnetically anisotropic material, the model considering magnetic anisotropy should be used. In this work, conventionally proposed magnetic field and iron loss models that can take anisotropic magnetic property into account, are applied to some models to evaluate its accuracy. The two-axis magnetic field model can obtain similar distribution to the magnetic field by θHB model. Therefore by using BAI iron-loss model with two-axis magnetic field model, relatively accurate iron loss value can be estimated.
PL
Przy projektowaniu urządzeń magnetycznych z anizotropowym materiałem te właściwości anizotropowe powinny być brane pod uwagę. W przedstawionej pracy użyto konwencjonalnego HB modelu do obliczeń. Wyniki porównano z modelem kątowym θHB. Sprawdzono także model BAI.
3
Content available remote Hole effect on magnetic field uniformity in Single Sheet Tester
Tamaki T., Fujisaki K., Yamada T.
Przegląd Elektrotechniczny
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2009
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R. 85, nr 1
71-73
EN
The magnetic field uniformity in the indirect magnetizing single sheet tester was analyzed by means of a finite element method. The holes for the B-coils on the sample give the effect on it. The sample with the holes of smaller diameter or without holes is required for the high accuracy evaluation.
PL
Jednorodność pola magnetycznego w jarzmie pomiarowym magnesowanym pośrednio została zbadana teoretycznie przy użyciu metody elementów skończonych. Otwory w próbce wymagane do wykonania cewek pomiarowych zakłócają jednorodność. Celem uzyskania wysokiej dokładności pomiaru wymagane są otwory o niewielkiej średnicy lub ich całkowity brak.
4
Content available remote Measurement of core loss in single sheet tester
Tamaki T., Fujisaki K., Yabumoto M., Hamada N.
Przegląd Elektrotechniczny
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2007
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R. 83, nr 4
14-17
PL
Straty mierzone testerem SSTz pośrednim magnesowaniem (gdzie próbka jest magnesowana za pośrednictwem rdzenia z cewkami magnesującymi) nie zawsze korespondują ze stratami mierzonymi testerem o bezpośrednim magnesowaniu (gdzie próbka jest umieszczona wewnątrz cewek magnesujących). W obu typach testerów czujniki H i B mają szerokość porównywalna z wymiarami próbki. Straty mierzone testerem o magnesowaniu pośrednim wykorzystującym zbyt małe czujniki różnią się od strat mierzonych testerem o bezpośrednim magnesowaniu.
EN
The core loss measured with the indirect magnetizing single sheet tester (SST) (in which a sample is placed between yokes and is indirectly magnetized by the yokes magnetized by magnetizing coils) roughly corresponds with that measured with the direct magnetizing SST used as standard (in which a sample is placed inside a magnetizing coil and is directly magnetized by the magnetizing coil). Both the SSTs have the B coil and the H coil whose widths are the same as the sample width. However, the core loss measured with the indirect magnetizing SST using the small size of the B coil and the H coil is much different from that measured with the direct magnetizing SST.
5
Content available remote Simulation of traffic flow through a toll gate
Shimizu H., Hara A., Tamaki T., Kita E.
Computer Assisted Mechanics and Engineering Sciences
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2007
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Vol. 14, No. 1
91-106
EN
This paper describes the simulation of the traffic flow through toll gate. A two-lane road is considered as the object domain and then, the local rules are defined to control the vehicle behavior. First, one simulates the traffic flows through the road with two non-ETC gates or the road with two ETC gates. The maximum traffic amount on the roads with two ETC gates is less than that on the road without gates by about 10%, while, in the case of the roads with two non-ETC gates, the maximum traffic amount decreases by 80%. Next, one simulates the traffic flows through the road with one non-ETC gate and one ETC gate. The traffic amount depends not only on the vehicle occupancy but also on the percentage of ETC vehicles among all driving vehicles.
6
Content available remote Topology and shape optimization of continuum structures by genetic algorithm and BEM
Kita E., Tamaki T., Tanie H.
Computer Assisted Mechanics and Engineering Sciences
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2004
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Vol. 11, No. 1
63-75
EN
This paper describes the topology and shape optimization scheme of continuum structures by using genetic algorithm (GA) and boundary element method (BEM). The structure profiles are defined by using the spline function surfaces. Then, the genetic algorithm is applied for determining the structure profile satisfying the design objectives and the constraint conditions. The present scheme is applied to minimum weight design of two-dimensional elastic problems in order to confirm the validity.
7
Content available remote Application of cellular automata simulation to truss structure design
Kita E., Toyoda T., Tamaki T., Xie Y. M.
Computer Assisted Mechanics and Engineering Sciences
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2004
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Vol. 11, No. 4
321-335
EN
In the cellular automata simulation, the object under consideration is divided into small cells and the simulation is performed according to the local rule which is defined as the local relationship among cells. In this paper, the concept of cellular automata is applied to the design scheme of truss structures. First, truss elements are considered as the cells of the cellular automata and the local rule is derived from the optimization problem. The objective functions are defined to minimize the total weight of the structure and to obtain even stress distribution in the whole structure. The constraint conditions are introduced in order to define the local rule. The present method is applied to the design of the plane and the three-dimensional truss structures such as Schwedler and Lamella Domes. The convergence histories of the total weight and the mean and the maximum stresses are shown in order to discuss the property of the present method.
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