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High Precision Ultrasonic Guided Wave Technique for Inspection of Power Transmission Line

Chinese Journal of Mechanical Engineering 2017年第1期30卷 170-179页

作者： CHENG Jun QIU Jinhao JI Hongli WANG Enrong TAKAGI Toshiyuki uchimoto tetsuya School of Physics and Technology Nanjing Normal UniversityNanjing 210042China School of Electrical and Automation Engineering Nanjing Normal UniversityNanjing 210042China State Key Laboratory of Mechanics and Control for Mechanical Structures Nanjing University of Aeronautics and AstronautiesNanjing 210016China Institute of Fluid Science Tohoku UniversitySendai 980-8577Japan

Due to the merits of high inspection speed and long detecting distance, Ultrasonic Guided Wave（UGW） method has been commonly applied to the on-line maintenance of power transmission line. However, the guided wave propagation in this structure is very complicated, leading to the unfavorable defect localization accuracy. Aiming at this situation, a high precision UGW technique for inspection of local surface defect in power transmission line is proposed. The technique is realized by adopting a novel segmental piezoelectric ring transducer and transducer mounting scheme, combining with the comprehensive characterization of wave propagation and circumferential defect positioning with multiple piezoelectric elements. Firstly, the propagation path of guided waves in the multi-wires of transmission line under the proposed technique condition is investigated experimentally. Next, the wave velocities are calculated by dispersion curves and experiment test respectively, and from comparing of the two results, the guided wave mode propagated in transmission line is confirmed to be F（1,1） mode. Finally, the axial and circumferential positioning of local defective wires in transmission line are both achieved, by using multiple piezoelectric elements to surround the stands and send elastic waves into every single wire. The proposed research can play a role of guiding the development of highly effective UGW method and detecting system for multi-wire transmission line.

关键词： ultrasonic guided wave inspection power transmission line piezoelectric transducer defect positioning wavelet transform

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Caution to Apply Magnetic Barkhausen Noise Method to Nondestructive Evaluation of Plastic Deformation in Some Ferromagnetic Materials

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Chinese Journal of Mechanical Engineering 2019年第6期32卷 85-91页

作者： Manru He Takanori Matsumoto tetsuya uchimoto Toshiyuki Takagi Hongen Chen Shejuan Xie Zhenmao Chen Shannxi Engineering Research Center for NDT and Structural Integrity Evaluation State Key Laboratory for Strength and Vibration of Mechanical StructuresSchool of AerospaceXi’an Jiaotong UniversityXi’an 710049China Institute of Fluid Science Tohoku UniversitySendai 980‑8577Japan

Magnetic Barkhausen Noise(MBN) method is known as an effective nondestructive evaluation(NDE) method for evaluation of residual stress in ferromagnetic materials. Some studies on the feasibility of the MBN method for NDE of residual strains were also conducted and found applicable. However, these studies are mainly focused on the state of residual strains which were introduced through a one-cycle-loading process. In practice, however, structures may suffer from an unpredictable and complicated loading history, i.e., the final state of plastic strain may be induced by several times of large loads. Whether the loading history has influences on MBN signals or not is of great importance for the practical application of the MBN method. In this paper, several ferromagnetic specimens with the same final state of residual strain but of different loading history were fabricated and inspected by using a MBN testing system. The experimental results reveal that the loading history has a significant influence on the detected MBN signals especially for a residual strain in range less than 1%, which doubts the feasibility to apply the MBN method simply in the practical environment. In addition, micro-observations on the magnetic domain structures of the plastic damaged specimens were also carried out to clarify the influence mechanism of loading history on the MBN signals.

关键词： Plastic damage Deformation history MBN method Ferromagnetic materials

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ASPEC:亚洲科学论文摘录语料库

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情报工程 2017年第3期3卷 40-46页

作者： Toshiaki Nakazawa Manabu Yaguchi Kiyotaka uchimoto Masao Utiyama Eiichiro Sumita Sadao Kurohashi Hitoshi Isahara 何彦青刘建辉科学技术振兴机构日本102-8666 国家信息与通讯研究所日本619-0289 京都大学日本606-8501 丰桥技术科学大学日本441-8580 中国科学技术信息研究所北京100038 河北地质大学石家庄050031

本文详细介绍了ASPEC(亚洲科学论文摘录语料库)。作为首个大规模的科学论文领域内的平行语料库,ASPEC是由日-中机器翻译项目于2006年至2010年间利用科技促进专用协作基金构建起来的。它包含约300万条平行语句的日-英科学论文摘要语料库(... 详细信息

本文详细介绍了ASPEC(亚洲科学论文摘录语料库)。作为首个大规模的科学论文领域内的平行语料库,ASPEC是由日-中机器翻译项目于2006年至2010年间利用科技促进专用协作基金构建起来的。它包含约300万条平行语句的日-英科学论文摘要语料库(ASPEC-JE)和约68万条平行语句的中-日科学论文摘录语料库(ASPEC-JC)。ASPEC被用作机器翻译评测研讨会WAT(亚洲翻译研讨会)的官方数据集。

关键词：平行语料库科学论文亚洲语言

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直肠全系膜切除术中在Denonvilliers筋膜后进行手术操作以保护泌尿生殖系统的自主神经:应用尸体标本的组织学研究,包括利用新鲜尸体模型的外科实验

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世界核心医学期刊文摘（胃肠病学分册） 2006年第12期2卷 16-16页

作者： Kinugasa Y. Murakami G. uchimoto K. 程妍 Department of Surgical Oncology Graduate SchoolTokyo Medical and Dental University1-5-45 YushimaBunkyo-kuTokyo 113-8519Japan Dr.

PURPOSE:Little is known about which urogenital nerves are liable to be injured along surgical planes in front of or behind Denonvilliers’ *** AND RESULTS:Using semiserial histology for five fixed male pelves,we demonstrated that:1) left/right communicating branches of bilateral pelvic plexuses run immediately in front of Denonvilliers’ fascia;and 2) a lateral continuation of Denonvilliers’ fascia separates the urogenital neurovascular bundle from the ***,the mesorectum contains no or few extramural ganglion *** the level of the seminal vesicles,incision in front of Denonvilliers’ fascia seems likely to injure superior parts of the pelvic plexus and the left/right ***,at the prostate level,this incision misleads the surgical plane into the neurovascular *** cadaveric dissections of five unfixed male pelves confirmed that the surgical plane in front of Denonvilliers’ fascia continues to a fascial space for the pelvic plexus containing ganglion cell clusters lateral and/or inferior to the seminal ***:To preserve all autonomic nerves for urogenital function,optimal total mesorectal excision for rectal cancer requires dissection behind Denonvilliers’ fascia.

关键词：切除术尸体标本 Denonvilliers 泌尿生殖系统组织学研究盆丛交通支神经血管束神

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