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A new Triangle Element for the Axisymmetric UBET
Shimizu, Toru,Sano, Toshio 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.3
UBET is a useful technique for the analysis of forging and other metal forming processes. However, geometrical shape of a element used in this technique is limited to a rectangle or a right angle triangle. To overcome this problem, an arbitrary shape triangle element which define a kinematically admissible velocity field using stream function is proposed and applied to the UBET. Although, this triangle element is a proper element to be used for the analysis of plane strain problem, it has several problems to be applied to axisymmetric problem. Therefore, a new arbitrary shape triangle element which has constant inlet flow at the side of the triangle is developed. On this element, a kinematically admissible velocity field is expressed easily using stream function and a second order isoparametric triangle element. The power consumption is calculated by the numerical integration. Also, a new conversion technique is introduced for the minimization of power consumption, and it makes possible to use many variables on UBET.
Recycling of Stainless Steel Grinding Sludge
Shimizu Toru,Hanada Kotarou,Adachi Satoru,Katoh Masahito,Hatsukano Kanichi,Matsuzaki Kunio 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Stainless steel sludge is generated as a waste in the grinding process, and the possibility of recycling stainless steel is considered here. In this study, we considered the possibility of using the stainless steel sludge as metal powder for MIM or raw material for metal foam. For the MIM process, the metal powder will need some improvement, and flotation and spheroidizing processes of the sludge are necessary. For fabrication of the metal foam, untreated sludge can be used, and steel foam about 90% porosity is produced.
Toru Eguchi,Takaaki Sekiai,Akihiro Yamada,Satoru Shimizu,Masayuki Fukai 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
We previously proposed a control technology to reduce CO and NOx emissions in power generating. In this technology, an optimal controllogic is obtained by Rein forcement Learning (RL) and a Radial Basis Function(RBF) network which constructs are sponse surface for the CO and NOx properties. An improvement of estimation accuracy of the response surface can enhance the controllogic performance, so the radius of RBF network should be determined properly since it is one of the most influential factors on estimation accuracy. On the other hand, adjustment of the radius should be executed with in several minutes as computational time for constructing the response surface is restricted. In this paper, we propose a new radiusad justing method for RBF network stoachieve high estimation accuracy and short computational time. This method adjustsradii based on the densities of learning data, thus it can achieve both high estimation accuracy and short computational time. The results of our evaluation showed that the proposed method had higher estimation accuracy than conventional methods with in apractical computatinal time.
Toru Shigemitsu,Junichiro Fukutomi,Hiroki Shimizu 한국유체기계학회 2012 International journal of fluid machinery and syste Vol.5 No.4
Small-sized axial fans are used as air coolers for electric equipment. There is a strong demand for higher power of fans according to the increase of quantity of heat from electric devices. Therefore, higher rotational speed design is conducted, although, it causes the deterioration of the efficiency and the increase of noise. Then, the adoption of contra-rotating rotors for small-sized fans is proposed for the improvement of the performance. In the case of contra-rotating rotors, blade row distance between the front and the rear rotors influences on the performance and the noise. Therefore, it is important to clarify the optimum blade row distance between front and rear rotors. The performance curves of the contra-rotating small-sized axial fan under the condition of different blade row distances are shown and the blade row interaction between the front and the rear rotors are discussed by the numerical results. Furthermore, the optimum blade row distance of the contra-rotating small-sized axial fan is considered.
Shigemitsu, Toru,Fukutomi, Junichiro,Shimizu, Hiroki Korean Society for Fluid machinery 2012 International journal of fluid machinery and syste Vol.5 No.4
Small-sized axial fans are used as air coolers for electric equipment. There is a strong demand for higher power of fans according to the increase of quantity of heat from electric devices. Therefore, higher rotational speed design is conducted, although, it causes the deterioration of the efficiency and the increase of noise. Then, the adoption of contra-rotating rotors for small-sized fans is proposed for the improvement of the performance. In the case of contra-rotating rotors, blade row distance between the front and the rear rotors influences on the performance and the noise. Therefore, it is important to clarify the optimum blade row distance between front and rear rotors. The performance curves of the contra-rotating small-sized axial fan under the condition of different blade row distances are shown and the blade row interaction between the front and the rear rotors are discussed by the numerical results. Furthermore, the optimum blade row distance of the contra-rotating small-sized axial fan is considered.
Masahiko Hayashi,Toru Kaiwa,Yoshiaki Matsushima,Makoto Shimizu,Takekazu Ishida,Kazuo Satoh,Tsutomu Yotsuya,Hiromichi Ebisawa 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1
It is shown that the spatial resolution of scanning superconducting quantum interference device (SQUID) microscope, which is considered naively to be limited by the size of the pickup coil (typically grater than of the order of ㎛), can be improved by applying a mathematical transformation to the obtained data. The resolution of the image is improved at best to the scanning step size (can be less than of the order of ㎛) even in the presense of the noise. Problems to be solved in applying the method to visualize the uxons in superconducting network structures are discussed by use of numerical simulations and of real experimental data.