Search Results 1-20 of 300

  • Flexural waves in a periodic non-uniform Euler-Bernoulli beam: Analysis for arbitrary contour profiles and applications to wave control

    Li Peng , Biwa Shiro

    … The flexural wave in a periodic non-uniform Euler-Bernoulli beam with arbitrarily contoured profiles is studied by utilizing the power series expansion method. … For a quadratic thickness variation, the first band gap evolution versus the structural parameter is investigated, based on which a flexural-wave-based low-pass filter for frequency shunting and a rectangular lens for energy focusing are designed. …

    International Journal of Mechanical Sciences (188), 2020-12-15

    IR 

  • AN EXPERIMENTAL STUDY ON DYNAMIC FLEXURAL BUCKLING FOR REINFORCED CONCRETE PILES IN LIQUEFIED SOIL USING CENTRIFUGE TESTS  [in Japanese]

    HAYASHI Kazuhiro , MIYACHI Yuichi , KIMURA Yoshihiro , TAMURA Shuji , SAITO Taiki

    … Therefore, when slender pile is subjected to high axial compression forces as a result of increased vertical loads by overturning moment of superstructure under the strong earthquake, flexural buckling may occur in pile member in soft ground. … Shakings were two Sweep wave (maximum acceleration: 4.19 m/s<sup>2</sup>, 4.44 m/s<sup>2</sup>) and one Rinkai wave (maximum acceleration: 7.36 m/s<sup>2</sup>). …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (773), 911-920, 2020-07

    J-STAGE  AIJ 

  • Simulation of rotating sound field excited by flexural vibration rings  [in Japanese]

    里信 純 , 高橋 周平

    … Rotating sound field excited by flexural vibration rings is used for some high power ultrasonicapplications. … To produce the traveling wave in the ring as the sound source, two standing wavesexcited both spatially and temporally orthogonal to each other should be superimposed in the ringusing two or more transducers. …

    広島工業大学紀要. 研究編 54, 101-105, 2020-02

    IR 

  • A NUMERICAL SIMULATION FOR TSUNAMI-HEIGHT REDUCTION USING A VERY LARGE FLOATING STRUCTURE  [in Japanese]

    KAKINUMA Taro , IGARASHI Riku , MURAKAMI Takahiro

    <p> 薄板状浮体と流体の相互干渉問題を対象とした数値モデルを適用し,超大型浮体構造物が有する津波高さの低減効果に関して検討した.津波が超大型浮体構造物に入射すると,分裂して浮体波が生成され,これに伴い津波高さが低減される.津波高さの最終的な低減率は,浮体の曲げ剛性率及び全長が大きいほど,また,入射する津波の波長が短いほど,大きくなった.また,岸沖方向に2基の浮体を設置する場合,沖側の …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 76(2), I_661-I_666, 2020

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  • Analysis of elastic wave propagation characteristics in isogrid structures  [in Japanese]

    UMEMURA Ryo , BIWA Shiro

    … <p>In this study, the elastic wave propagation characteristics in isogrid structures are investigated by numerical analysis. … It is also found that while the second branch (dominated by in-plane transverse wave) and the third branch (dominated by longitudinal wave) propagate in an isotropic manner, the first branch (dominated by flexural wave) has anisotropic characteristics.</p> …

    The Proceedings of the Materials and Mechanics Conference 2019(0), OS1509, 2019

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  • Analysis of flexural wave scattering by square arrangements of circular holes on an elastic plate  [in Japanese]

    KISHIDA Yuya , BIWA Shiro

    … <p>In this study, the scattering of flexural waves by square arrangements of a finite number of circular holes on a thin elastic plate is analyzed based on the Kirchhoff plate theory. … The analysis is performed in the frequency domain by expressing the exciting and scattered flexural wave fields in terms of eigenfunction expansion, and calculating the expansion coefficients by a numerical collocation method. …

    The Proceedings of the Materials and Mechanics Conference 2019(0), OS0208, 2019

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  • Defect imaging for plate-like structures using diffuse field

    Hayashi Takahiro

    … This study developed defect imaging by the SLS using diffuse field concepts to reduce the intensity of spurious images, by which the energy of flexural waves excited by laser can be estimated. … The experimental results in the different frequency bandwidths of excitation waves and in specimens with different attenuation proved that clearer images of defects are obtained in broadband excitation using a chirp wave and in specimens with low attenuation, which produce diffuse fields easily. …

    The Journal of the Acoustical Society of America 143(4), 2018-04

    IR 

  • Multiple scattering and stop band characteristics of flexural waves on a thin plate with circular holes

    Wang Zuowei , Biwa Shiro

    … A numerical procedure is proposed for the multiple scattering analysis of flexural waves on a thin plate with circular holes based on the Kirchhoff plate theory. … The numerical procedure utilizes the wave function expansion of the exciting as well as scattered fields, and the boundary conditions at the periphery of holes are incorporated as the relations between the expansion coefficients of exciting and scattered fields. …

    Journal of Sound and Vibration (416), 80-93, 2018-03-03

    IR 

  • Multiple scattering analysis of flexural waves on an elastic plate with multiple circular holes  [in Japanese]

    KINOSHITA Yohei , BIWA Shiro

    … <p>In this study, the multiple scattering of flexural waves on a flat elastic plate with multiple circular holes is investigated based on the Mindlin plate theory. … As an example, the transmission behavior of plane monochromatic flexural waves is analyzed in the case where circular holes are arranged in a square array. …

    The Proceedings of the Materials and Mechanics Conference 2018(0), OS1033, 2018

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  • The effect of lamination gap on flexural modulus of woven fabric composite laminates  [in Japanese]

    SUGIYAMA Kazushi , YOSHIDA Keishiro

    … <p>In this study, the effect of the lamination gap on the flexural modulus of the laminate, particularly the plain-weave fabric composite laminate with two plies, is investigated through finite element analyses. …

    The Proceedings of Conference of Hokuriku-Shinetsu Branch 2018.55(0), G043, 2018

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  • COLLAPSE BEHAVIOR OF 6 STORY WALL FRAME BUILDING DURING SHAKING TABLE TEST:Research and development for quantification of collapse margin of RC buildings  [in Japanese]

    SUGIMOTO Kuniyoshi , TASAI Akira , KATSUMATA Hideo , MASUDA Yasuhiko , YONEZAWA Kenji , NISHIMURA Katsuhisa , MIURA Kota , NISHIYAMA Minehiro , MATSUMORI Taizo , KAGAMIHATA Tomoki

    … Outline of the Test Results</b><br> At the shakings in the tests, shear failure of walls at the first and second stories occurred, flexural hinges were formed at both top and bottom of the columns at the first story, and the building specimen collapsed finally with collision between balconies of its third and fourth stories and steel frame for safety.<br> <b>4. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (741), 1759-1768, 2017-11

    J-STAGE  AIJ 

  • Energy Analyses for the Imaging Technique of Bonded Regions and Delaminations in a Thin Plate

    Hayashi Takahiro , Nakao Shogo

    … The variations of flexural wave energy generated at a laser source close to a plate edge, a junction of two thin plates, a bonded region, and a delamination are discussed using the Kirchhoff–Love plate theory and a semi-analytical finite element method. …

    Materials Transactions 58(9), 1264-1273, 2017-09

    IR 

  • Computational multiple scattering analysis of flexural waves on a perforated Kirchhoff plate  [in Japanese]

    WANG Zuowei , BIWA Shiro

    … <p>This paper presents a general numerical procedure for multiple scattering analyses of flexural waves on a Kirchhoff plate with arbitrary arrangements of circular holes. … The time-harmonic deflection field of the plate is given as the sum of the incident wave fields and the scattered wave fields by the embedded holes. …

    NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan 64(0), GS1-02, 2017

    J-STAGE 

  • Effects of Fly Ash on Mechanical Properties of PC Girder Using Reac-tive Andesite Aggregates

    Ha Tuan Minh , Fukada Saiji , Torii Kazuyuki

    … From results of the long-term exposure and the tests, the flexural strength and the rigidity of the specimen with fly ash were not degraded while ASR was also effectively suppressed. … In addition, cylindrical concrete cores were taken at different positions of both girders to analyze the relationship between mechanical properties of concrete such as compressive strength, static elastic modulus, and ultrasonic wave propagation speed. …

    Journal of Advanced Concrete Technology 15(10), 579-594, 2017

    J-STAGE 

  • Energy Analyses for the Imaging Technique of Bonded Regions and Delaminations in a Thin Plate

    Hayashi Takahiro , Nakao Shogo

    … The variations of flexural wave energy generated at a laser source close to a plate edge, a junction of two thin plates, a bonded region, and a delamination are discussed using the Kirchhoff–Love plate theory and a semi-analytical finite element method. …

    MATERIALS TRANSACTIONS 58(9), 1264-1273, 2017

    J-STAGE 

  • Effects of fly ash on mechanical properties of pc girder using reactive andesite aggregates

    Ha Tuan Minh , Fukada Saiji , Torii Kazuyuki , 深田 宰史 , 鳥居 和之

    … From results of the long-term exposure and the tests, the flexural strength and the rigidity of the specimen with fly ash were not degraded while ASR was also effectively suppressed. … In addition, cylindrical concrete cores were taken at different positions of both girders to analyze the relationship between mechanical properties of concrete such as compressive strength, static elastic modulus, and ultrasonic wave propagation speed. …

    Journal of Advanced Concrete Technology 15(10), 579-594, 2017

    IR  DOI 

  • Imaging defects in a plate with complex geometries

    Hayashi Takahiro

    … This technique utilizes a characteristic of flexural vibrations wherein the amplitude of the received signals is approximately inversely proportional to the thickness of the source of the elastic wave when a laser pulse is applied to the surface of the plate. …

    Applied Physics Letters 108(8), 2016-02-22

    IR 

  • Cyclotron transition line-width due to interactions with the flexural wave of a phonon confined in a quantum well

    Kang Nam Lyong

    Japanese Journal of Applied Physics 55(3), 035201-035201, 2016-02-10

    DOI 

  • Detection and Thickness Estimation of Water Layer in Layered Medium Based on Multi-Reflection of Oblique Incident Ultrasonic Wave

    Shen Yang , Hirose Sohichi

    … A reinforced concrete (RC) slab of a bridge is sometimes strengthened by attaching a steel plate on the bottom of the slab to enhance the flexural capacity. … Through comparison with the theoretical wave travelling time in the water layer, the thickness of the water layer can be estimated from the time interval of reflected wave groups. …

    MATERIALS TRANSACTIONS 57(6), 949-958, 2016

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  • Evaluation Method for Reduced Area Ratio of Re-bars and Flexural Capacity of RC-beams with Corroded Plural Re-bars Based on Non-destructive Tests  [in Japanese]

    Kuroda Ichiro

    腐食程度の異なる2本の鉄筋を有する鉄筋コンクリート梁供試体を対象として,非破壊検査(ひび割れ幅と超音波伝搬速度)による,鉄筋の断面積減少率の推定方法を検討した。非破壊検査は,2本の鉄筋の腐食による影響を区別できない状態を想定して実施し,その場合であっても充分安全側に断面積減少率を推定可能であることを示した。更に,得られた鉄筋の断面積減少率推定結果をインプットとして用いて,土木学会コンクリート示方書 …

    Concrete Research and Technology 27(0), 43-55, 2016

    J-STAGE 

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