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Algorithm Selection Method Based on Coupling Strength for Partitioned Analysis of Structure-Piezoelectric-Circuit Coupling

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Computer Modeling in Engineering & Sciences 2024年第2期138卷 1237-1258页

作者： Daisuke Ishihara Naoto takayama Department of Intelligent and Control Systems Kyushu Institute of TechnologyIizuka820-8502Japan

In this study, we propose an algorithm selection method based on coupling strength for the partitioned analysis ofstructure-piezoelectric-circuit coupling, which includes two types of coupling or inverse and direct piezoelectriccoupling and direct piezoelectric and circuit coupling. In the proposed method, implicit and explicit formulationsare used for strong and weak coupling, respectively. Three feasible partitioned algorithms are generated, namely(1) a strongly coupled algorithm that uses a fully implicit formulation for both types of coupling, (2) a weaklycoupled algorithm that uses a fully explicit formulation for both types of coupling, and (3) a partially stronglycoupled and partially weakly coupled algorithm that uses an implicit formulation and an explicit formulation forthe two types of coupling, *** examples using a piezoelectric energy harvester,which is a typicalstructure-piezoelectric-circuit coupling problem, demonstrate that the proposed method selects the most costeffectivealgorithm.

关键词： Multiphysics coupling strength partitioned algorithm structure-piezoelectric-circuit coupling strongly coupled algorithm weakly coupled algorithm

Hybrid Strategy of Partitioned and Monolithic Methods for Solving Strongly Coupled Analysis of Inverse and Direct Piezoelectric and Circuit Coupling

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Computer Modeling in Engineering & Sciences 2024年第8期140卷 1371-1386页

作者： Daisuke Ishihara Syunnosuke Nozaki Tomoya Niho Naoto takayama Department of Intelligent and Control Systems Kyushu Institute of TechnologyFukuokaJapan

The inverse and direct piezoelectric and circuit coupling are widely observed in advanced electro-mechanical systems such as piezoelectric energy *** strongly coupled analysis methods based on direct numerical modeling for this phenomenon can be classified into partitioned or monolithic *** formulation has its advantages and disadvantages,and the choice depends on the characteristics of each coupled *** study proposes a new option:a coupled analysis strategy that combines the best features of the existing formulations,namely,the hybrid partitioned-monolithic *** analysis of inverse piezoelectricity and the monolithic analysis of direct piezoelectric and circuit interaction are strongly coupled using a partitioned iterative hierarchical *** a typical benchmark problem of a piezoelectric energy harvester,this research compares the results from the proposed method to those from the conventional strongly coupled partitioned iterative method,discussing the accuracy,stability,and computational *** proposed hybrid concept is effective for coupled multi-physics problems,including various coupling conditions.

关键词： Structure-piezoelectric-circuit interaction energy harvesting partitioned method monolithic method hybrid method

Giant photoinduced reflectivity modulation of nonlocal resonances in silicon metasurfaces

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Advanced Photonics 2023年第6期5卷 83-91页

作者： Andrea Tognazzi Paolo Franceschini Olga Sergaeva Luca Carletti Ivano Alessandri Giovanni Finco osamu takayama Radu Malureanu Andrei V.Lavrinenko Alfonso C.Cino Domenico de Ceglia Costantino De Angelis University of Palermo Department of EngineeringPalermoItaly National Institute of Optics-National Research Council PalermoItaly University of Brescia Department of Information EngineeringPalermoItaly ITMO University School of Physics and EngineeringSaint-PetersburgRussia ETH Zurich Institute for Quantum ElectronicsDepartment of PhysicsOptical Nanomaterial GroupZurichSwitzerland Technical University of Denmark Department of Electrical and Photonics EngineeringKongens LyngbyDenmark

Metasurfaces offer a unique playground to tailor the electromagnetic field at subwavelength scale to control polarization,wavefront,and nonlinear *** of the optical response of these structures is challenging due to the nanoscale size of their constitutive elements.A long-sought solution to achieve tunability at the nanoscale is all-optical modulation by exploiting the ultrafast nonlinear response of ***,the nonlinear response of materials is inherently very weak,and,therefore,requires optical excitations with large values of *** show that by properly tuning the equilibrium optical response of a nonlocal metasurface,it is possible to achieve sizable variation of the photoinduced out-ofequilibrium optical response on the picosecond timescale employing fluences smaller than 250μJ∕cm^(2),which is 1 order of magnitude lower than previous studies with comparable reflectivity variations in silicon *** results pave the way to fast devices with large modulation amplitude.

关键词： nonlocal metasurface nanophotonics ultrafast modulation Fano resonance

2-D localization system utilizing M-sequence encoded laser beam scanning

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仪器仪表学报 2007年第3期28卷 408-413页

作者： Shinji Ohyama Kiyoshi Tanaka Junya takayama Graduate School of Science and Engineering Tokyo Institute of Technology 2-12-1 O-okayama Meguro-ku Tokyo 152-8552 Japan

In this paper, as the active position measurement system, a novel method for a two-dimensional localization system using M-sequence signal is proposed. The feature of this system is to realize a position measurement only by scanning the encoded laser beams from fixing points to a measurement field, and by observing it. First, both the system configuration and encoding method were practically considered, and an order and an initial value of M-sequence signal were selected for encoding. This method is based on discrete angle measurement therefore the resolution has its own limitation. To overcome this limitation, analogue phase shift detecting method was introduced. System design was performed and applied to position measurement experiments. The experimental results show that the measurement error of the analogue method is 1/3 of that of the discrete method.

关键词：激光电子束扫描位置测量二维定位系统 M序列离散法

Suppression of Wave-Excited Vibration of Offshore Platform by Use of Tuned Liquid Dampers

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China Ocean Engineering 2001年第2期16卷 165-176页

作者：董胜李华军 Tomotsuka takayama College of Engineering Ocean University of Qingdao Qingdao 266003 China Disaster Prevention Research Institute Kyoto University Gokasho Uji Kyoto 611-0011 Japan

This paper describes experimental and theoretical investigations of Tuned Liquid Damper (TLD) characteristics for suppressing the wave-excited structural vibration. The structural model for the experiments is scaled according to a full size offshore platform by matching their dynamic properties. Rectangular TLDs of different sizes with partially filled liquid are examined. By observing the performance and behavior of TLDs through laboratory experiments, the Study investigates the influence of a number of parameters, including container size, container shape, frequency ratio, and incident wave characteristics. In an analytical study, a mathematical model that describes the nonlinear behavior of liquid in TLD and the interaction of TLD and structure is prerequisite. The validity of the model is evaluated and simulating results can reasonably match the corresponding experimental results.

关键词： numerical simulation offshore platform tuned liquid damper structural vibration rectangular container shallow water wave theory

Study on fragmentation behavior of taxoids by tandem mass spectrometry

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Chinese Science Bulletin 2000年第8期45卷 688-698页

作者： Zeper Abliz Mitsuo takayama Institute of Materia Medica Chinese Academy of Medical Sciences & Peking Union Medical CollegeBeiging 100050.ChinaFaculty of Pharmaceutical SciencesToho University2-2-1 MiyamaFunabashiChiba 274Japan

We have studied the fragmentation behavior of positive and negative ions of taxoi and 6/8/6 type taxoids, the influence of different substituents on fragmentation, and the correlativity between fragmentation patterns and structure by MS/MS technique with different ionization methods such as FAB-MS, ESI-MS, ete. We have also investigated in detail the fragmentation of various molecular-related ions, such as [M+H]+, [M+Na]+ and [M-H] ions, and the formation pathways of characteristic fragment ions. It has been found that there exists some competing reaction between the loss of C-13 side chain and decomposition by loss of acetic acid. In addition, by comparing CID spectra obtained with low- and high-energy collision, it is seen that CID-MS/MS with low-energy collision is more suitable for the study of the structural analysis of small molecules and drug metabolites. The experimental results demonstrate that MS/MS spectra can reflect more effectively the slight difference of structure between the related

关键词： taxol taxoids tandem mass spectrometry fragmentation behavior.

The Optimal Design of TMD for Offshore Structures

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China Ocean Engineering 1999年第2期14卷 133-144页

作者： Sau Lon James HU Tomotsuka takayama Dept. of Ocean Engrg. University of Rhode Island RI02881 Professor Professor Disaster Prevention Res. Inst. Kyoto Univ. Gokasho Uji Kyoto 611-0011 Japan.

This paper presents the optimal design procedure of Tuned Mass Damper (TMD) for reducing vibration of an actual steel jacket offshore platform excited by random wave loading. In this study, a frequency domain is taken. The force on the structure is determined by use of the linearized Morison equation for an input Power Spectral Density (PSD) of wave elevation. The sensitivity of optimum values of TMD to characteristic parameters of random wave spectrum is analyzed. An optimized TMD design for the modeled platform is given based on design conditions and the findings of the study.

关键词： tuned mass damper design Morison equation power spectral density offshore structures

ADCP application for long-term monitoring of coastal water

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Acta Oceanologica Sinica 2005年第1期24卷 95-100页

作者： YOSHIOKA Hiroshi takayama Tomotsuka SERIZAWA Shigeatsu Faculty of Information Science and Technology Aichi Prefectural University Aichi 480-1198 JapanDisaster Prevention Research Institute Kyoto-University Kyoto 611-0011 JapanDisaster Prevention Research Institute Kyoto-University Kyoto 611-0011 Japan

Three kind of application of ADCP is reported for long-term monitoring in coastal sea.(1)The routine monitoring of water qualities. The water quality and ADCP echo data (600 kHz) observed in the long-term are analgzed at MT (Marine Tower) Station of Kansai International Airport in the Osaka Bay, Japan. The correlation between the turbidity and echo intensity in the surface layer is not good because air bubbles generated by breaking wave are not detected by the turbidity meter, but detected well by ADCP. When estimating the turbidity consists of plankton population from echo intensity, the effect of bubbles have to be eliminated. (2) Monitoring stirring up of bottom sediment. The special observation was carried out by using following two ADCP in the Osaka Bay, One ADCP was installed upward on the sea. The other ADCP was hanged downward at the gate type stand about 3 m above from the bottom. At the spring tide, high echo intensities indicating the stirring up of bottom sediment were observed. (3) The monitoring for the boundary condition of water mixing at an estuary. In summer season, the ADCP was set at the mouth of Tanabe Bay in Wakayama Prefecture, Japan. During the observation, water temperature near the bottom showed remarkable falls with interval of about 5-7 d. When the bottom temperature fell, the inflow current with low echo intensity water appears at the bottom layer in the ADCP record. It is concluded that when occasional weak northeast wind makes weak coastal upwelling at the mouth of the bay, the combination of upwelling with internal tidal flow causes remarkable water exchange and dispels the red tide.

关键词： ADCP echo intensity monitoring coastal water red tide stirring up

Acoustic CT system for temperature distribution measurement

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仪器仪表学报 2008年第5期29卷 897-902页

作者： Shinji Ohyama Toyofumi Oga Kazuo Oshima Junya takayama Graduate School of Science and Engineering Tokyo Institute of Technology 2-12-1 O-okayama Meguro-ku Tokyo 152-8552 Japan Research and Development Headquarters NTT FACILITIES INC. Minato-ku Tokyo Japan

In this paper, a measurement method for cross-sectional temperature distribution is addressed. A novel method based on an acoustic CT technique is proposed. Specifically, the temperature distributions are estimated using the time of flight data of several ultrasonic propagation paths. The times of the flight data contain both temperature and wind effect, and the method to select only temperature component is introduced. A filtered back projection method is applied to reconstruct the temperature distributions from the time of flight data. An experimental system was designed and fabricated to realize simultaneous temperature and wind velocity distribution measurements. Through this system, the effectiveness of the proposed measurement method is confirmed.

关键词：声波CT技术温度分布测量方法超声波