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Nomura, Akihiro,Won, Hong-Hee,Khera, Amit V.,Takeuchi, Fumihiko,Ito, Kaoru,McCarthy, Shane,Emdin, Connor A.,Klarin, Derek,Natarajan, Pradeep,Zekavat, Seyedeh M.,Gupta, Namrata,Peloso, Gina M.,Borecki, Grune & Stratton 2017 Circulation research Vol.121 No.1
<P>Conclusions: Compared with noncarriers, carriers of PTV at CETP displayed higher high-density lipoprotein cholesterol, lower low-density lipoprotein cholesterol, lower triglycerides, and lower risk for CHD.</P>
DEVELOPMENT OF INTELLIGENT POWER UNIT FOR HYBRID FOUR-DOOR SEDAN
K. AITAKA,M. HOSODA,T. NOMURA 한국자동차공학회 2003 International journal of automotive technology Vol.4 No.2
The Intelligent Power Unit (IPU) utilized in Honda's Civic Hybrid Integrated Motor Assist (IMA) system was developed with the aim of making every component lighter, more compact and more efficient than those in the former model. To reduce energy loss, inverter efficiency was increased by fine patterning of the Insulated Gate Bipolar Transistor (IGBT) chips, 12V DC-DC converter efficiency was increased by utilizing soft-switching. and the internal resistance of the IMA battery was lowered by modifying the electrodes and the current collecting structure. These improvements reduced the amount of heat generated by the unit components and made it possible to combine the previously separated Power Control Unit (PCU) and battery cooling systems into a single system. Consolidation of these two cooling circuits into one has reduced the volume of the newly developed IPU by 42% compared to the former model.
Lee, Jaewook,Kim, Dongjin,Nomura, Tsuyoshi,Dede, Ercan M.,Yoo, Jeonghoon Elsevier 2018 COMPOSITE STRUCTURES -BARKING THEN OXFORD- Vol.201 No.-
<P><B>Abstract</B></P> <P>This paper presents a topology optimization method for the sequential design of material layout and fiber orientation in functionally graded fiber-reinforced composite structures. Specifically, the proposed method can find the optimal structural layout of matrix and fiber materials together with optimal discrete fiber orientations. In this method, an orientation design variable in the Cartesian coordinate system is employed with a conventional density design variable. The orientation design variable controls not only the fiber orientation, but also fiber volume fraction. The fiber volume fraction control can be used to relax the orientation design problem and simultaneously design a functionally graded structural layout of fiber material. To avoid intermediate fiber orientations and achieve discrete fiber orientation design, a penalization scheme is applied to the orientation design variable. For solving the optimization problem which involves multiple design variables such as the density variable, fiber orientation variable, and target discrete orientation set, a three-step sequential optimization procedure is proposed. In this procedure, the result for each step provides the isotropic design, continuous fiber orientation design, and functionally graded discrete orientation design, respectively. To validate the effectiveness of the proposed approach, numerical examples for structural compliance minimization and compliant mechanism design are provided.</P>
Topology optimization for design of segmented permanent magnet arrays with ferromagnetic materials
Lee, Jaewook,Yoon, Minho,Nomura, Tsuyoshi,Dede, Ercan M. Elsevier 2018 Journal of magnetism and magnetic materials Vol.449 No.-
<P><B>Abstract</B></P> <P>This paper presents multi-material topology optimization for the co-design of permanent magnet segments and iron material. Specifically, a co-design methodology is proposed to find an optimal border of permanent magnet segments, a pattern of magnetization directions, and an iron shape. A material interpolation scheme is proposed for material property representation among air, permanent magnet, and iron materials. In this scheme, the permanent magnet strength and permeability are controlled by density design variables, and permanent magnet magnetization directions are controlled by angle design variables. In addition, a scheme to penalize intermediate magnetization direction is proposed to achieve segmented permanent magnet arrays with discrete magnetization directions. In this scheme, permanent magnet strength is controlled depending on magnetization direction, and consequently the final permanent magnet design converges into permanent magnet segments having target discrete directions. To validate the effectiveness of the proposed approach, three design examples are provided. The examples include the design of a dipole Halbach cylinder, magnetic system with arbitrarily-shaped cavity, and multi-objective problem resembling a magnetic refrigeration device.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A co-design method of magnet segment and iron is proposed using topology optimization. </LI> <LI> A material interpolation scheme is proposed for multi-material representation. </LI> <LI> A penalization scheme is proposed to achieve segmented magnet arrays. </LI> <LI> The effectiveness of proposed design method is validated in three optimization examples. </LI> </UL> </P>