Misc - MURATA Yorinobu

Non-Destructive Evaluation of the Integrity of Electrofusion Joint in PE Gas Pipes Using a Tocused Ultrasonic Transducer

H.Toda, Y.Murata, K.Nakajima

Proc. of the 6th Far East Conference on Non-Destructive Testing     517 - 522   2002

Fabrication of Broad band Ultrasonic Transducer with multi-layered Piezoelectric Porymer Film

尾形 俊明, 高野宮 昌典, 村田 頼信, 戸田 裕己

大会講演概要集   2001 ( 2 ) 51 - 52   2001.10

Quantitative Evaluation of Fating Cracks in Wheel Set Axle for Railway Using a Wave Forming Technique

谷本 晃久, 戸田 裕己, 村田 頼信

大会講演概要集   2001 ( 2 ) 47 - 48   2001.10

Fabrication and Evaluation of Porymer Concave Ultrasonic Transducer for PE-gas Pipes Inspection

高野宮 昌典, 尾形 俊明, 村田 頼信, 戸田 裕己

大会講演概要集   2001 ( 1 ) 5 - 6   2001.05

Development of Electrofusion Interface Ultrasonic Inspection Technique, Contributing to Construction of Highly Reliable PE Piping

T. Kitaoka, H. Toda, Y. Murata, J. Furukawa, Development of Electrofusion Interface Ultrasonic, Inspection Technique, Contributing to Construction of Highly Reliable PE Piping

Proc. of 2001 Int. Gas Research Conf.   CD-ROM pulication   2001

Development of Electrofusion Interface Ultrasonic Inspection Technique, Contributing to Construction of Highly Reliable PE Piping

Proc. of 2001 Int. Gas Research Conf.   CD-ROM publication   2001

和歌山大学システム工学部光メカトロニクス学科波動エレクトロニクス研究グループ

戸田 裕己, 村田 頼信

非破壊検査   49 ( 12 ) 868 - 868   2000.12

Quantitative Evaluation of Fatigue Cracks in Wheel Set Axle for Railway Using a Wave Forming Technique(Part2)

TANIMOTO A., HATIYA M., TODA H., MURATA Y., YOHSO J., ISHIZUKA H.

大会講演概要集 ( 日本非破壊検査協会 )  2000 ( 2 ) 213 - 214   2000.11

超音波計測における信号処理

村田頼信

和歌山大学システム情報学センター広報   vol.4   61 - 68   2000

Detection of Fatigue Cracks in Wheel Set Axle for Railway Using a Wave Forming Technique

村田 頼信, 戸田 裕己, 養祖 次郎, 石塚 弘道

大会講演概要集   1999 ( 1 ) 189 - 190   1999.05

Detection of fatigue cracks in wheel set axle using ultrasonic grazing SH-waves shortened by deconvolution method

Proc. of the second Japan-US symposium on advances in NDT   pp.94-98   1999

Detection of fatigue cracks in wheel set axle using ultrasonic grazing SH-waves shortened by deconvolution method

Y. Murata, H. Toda, Detection of, fatigue, cracks in wheel set, axle using, ultrasonic grazing, SH-waves shortened by deconvolution method

Proc. of the second Japan-US symposium on advances in NDT     94 - 98   1999

Acoustoelasticity measurement of axial stresses in long rail

H. Toda, Y. Murata

Proc. 2nd Jpn. -US Symp. Advances in NDT   pp.7-11   7 - 11   1999

粒子分散媒体における超音波の周波数応答特性

村田頼信

5回超音波シンポ   89   1998

A new vector velocimetry by real time ultrasonic imaging using M-sequence encoding array transducer

Y Murata, H Toda, Y Tamura, K Koyama

1998 IEEE ULTRASONICS SYMPOSIUM - PROCEEDINGS, VOLS 1 AND 2 ( IEEE )    763 - 766   1998

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In order to measure velocity vector of moving object in water, we have developed a new vector velocimetry using ultrasound. Velocity vector was measured by real-time ultrasonic imaging using M-sequence encoding array transducer. When this array transducer was applied to ultrasonic imaging, a cross section image was obtained by a transmitting and receiving process.
In experiment, we tried to measure the two dimensional velocity vector of a wire target moving at a constant velocity of 10.0 mm/s and at a constant angle of 45 degrees away from the transducer surface. An ultrasonic pulse was transmitted with a constant interval time of 10.0 ms, and We obtained ultrasonic images of 16. The system was operated at the frequency of 2.5 MHz, Images at each acquisition were reconstructed by correlation method. The velocity vector was calculated by the trajectory of target in each image. In conclusion, it was found that the velocity vector of the target be measured with accuracy 4 % by the developed vector velocimetry.

A Basic Study on Vector Velocimetry Using Ultrasonic Encoding Aperture Transducer

村田 頼信, 戸田 裕己, 木下 伸司, 田村 安孝, 小山 清人

大会講演概要集   1997 ( 2 ) 33 - 36   1997.11

超音波符号化開口トランスデューサによる速度ベクトル計測の基礎的検討

村田頼信

9年度秋季大会   33   1997

Development of Ultrasonic Transducer Using Piezoelectric Copolymer Film for Ultrasonic Imaging

6th SPSJ Int. Polymer Conf.   pp.294   1997

Development of Ultrasonic Transducer Using Piezoelectric Copolymer Film for Ultrasonic Imaging

N. Kawakami, Y. Tamura, Y. Murata, Y. Masubuchi, J. Takimoto, K. Koyama, Development of, Ultrasonic Transducer Using Piezoelectric Copolymer Film for, Ultrasonic Imaging

6th SPSJ Int. Polymer Conf.     pp.294   1997

Flow of Polymer Melt in a Disk-shaped Mold under Ultrasound Radiation

MURATA Yorinobu, KIMURA Satoshi, MINAGAWA Keiji, TAKIMOTO Jun-ichi, KOYAMA Kiyohito

Journal of the Japan Society of Polymer Processing ( The Japan Society of Polymer Processing )  7 ( 9 ) 478 - 567   1995

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We proposed a new technique for stirring polymer melt in a mold by acoustic streaming to prevent formation of weldlines in injection molding process. We have demonstrated the generation of the acoustic streaming in high viscosity polymer melt. We radiated ultrasound in a disk-shaped mold to induce the acoustic streaming in the thickness direction of the mold. The acoustic streaming in the polymer melt was examined by observing, after cooling, the displacements of tracers in the cross section of the molded product. We have succeeded in generating the acoustic streaming in the polymer melt of 11000Pa·s in the mold. The acoustic streaming was, however, strongly affected by reflected waves from the surface of the melt. We have found that the acoustic streaming can be efficiently generated in the mold if the interference with the reflected waves are decreased by using a tone-burst ultrasound.

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