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Partitioned Method of Insect flapping flight for Maneuvering Analysis

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Computer Modeling in Engineering & Sciences 2019年第10期121卷 145-175页

作者： Minato Onishi Daisuke ishihara Kyushu Institute of Technology 680-4 KawazuIizuka Fukuoka820-8502Japan

This study proposed a partitioned method to analyze maneuvering of insects during flapping *** method decomposed the insect flapping flight into wing and body subsystems and then coupled them via boundary conditions imposed on the wing’s base using one-way *** the wing subsystem,the strong coupling of the flexible wings and surrounding fluid was accurately analyzed using the finite element method to obtain the thrust forces acting on the insect’s *** resulting thrust forces were passed from the wing subsystem to the body subsystem,and then rigid body motion was analyzed in the body *** rolling,yawing,and pitching motions were simulated using the proposed method as follows:In the rolling simulation,the difference of the stroke angle between the right and left wings caused a roll *** the yawing simulation,the initial feathering angle in the right wing only caused a yaw *** the pitching simulation,the difference between the front-and back-stroke angles in both the right and left wings caused a pitch *** three torques generated maneuvering motion comparable with that obtained in actual observations of insect *** results demonstrate that the proposed method can adequately simulate the fundamental maneuvers of insect flapping *** the present simulations,the maneuvering mechanisms were investigated at the governing equation level,which might be difficult using other ***,the proposed method will contribute to revealing the underlying insect flight mechanisms.

关键词： Insect flapping flight maneuverability fluid-structure interaction partitioned method projection method strongly coupled method one-way coupling finite element method

Merging bound states in the continuum in an open acoustic resonator

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 124-131页

作者： Lujun Huang Bin Jia Artem S.Pilipchuk Sibo Huang Chen Shen Almas f.Sadreev Yong Li Andrey E.Miroshnichenko School of Physics and Electronic Sciences East China Normal University Institute of Acoustics Tongji University L.V.Kirensky Institute of Physics Department of Mechanical Engineering Rowan University School of Engineering and Technology University of New South Wales at Canberra

Bound states in the continuum （BICs） are perfectly localized resonances despite embedding in the continuum ***,an isolated BIC is very sensitive to the structure ***,we report merging acoustic BICs in a single open resonator,robust against the structure *** find that both symmetry-protected BIC and friedrich-Wintgen BIC are sustained in a single coupled waveguide-resonator *** varying the height and length of the resonator,these two BICs move toward each other and merge into a single one at a critical *** to an individual BIC,the merged BIC is robust against fabrication error because its Q-factor is proportional to ΔL-4,whereΔL embodies the structure *** essence of this extraordinary phenomenon is perfectly explained by the two-and three-level approximations of the effective nonHermitian ***,we present direct experimental demonstrations of the moving and merging of BICs in a coupled 3D waveguide-resonator,which are evidenced by the vanishing of the linewidth of fano resonance in the transmission *** results may find exciting applications in designing high-quality acoustic sources,sensors and filters.

关键词： acoustic resonances bound state in the continuum high-Q resonances

Two-step Design of Critical Control Systems Using Disturbance Cancellation Integral Controllers

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International Journal of Automation and computing 2011年第1期8卷 37-45页

作者： Tadashi ishihara Takahiko Ono faculty of Science and Technology Fukushima University Graduate School of Information Sciences Hiroshima City University

An efficient critical control system design is proposed in this paper. The key idea is to decompose the design problem into two simpler design steps by the technique used in the classical loop transfer recovery method （LTR）. The disturbance cancellation integral controller is used as a basic controller. Since the standard loop transfer recovery method cannot be applied to the disturbance cancellation controller, the nonstandard version recently found is used for the decomposition. Exogenous inputs with constraints both on the amplitude and rate of change are considered. The majorant approach is taken to obtain the analytical sufficient matching conditions. A numerical design example is presented to illustrate the effiectiveness of the proposed design.

关键词： Critical control systems principle of inequalities principle of matching majorants disturbance cancellation controller integral controller loop transfer recovery (LTR).

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

Molecular functions of Oxygen-Evolving Complex family Proteins in Photosynthetic Electron flow

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Journal of Integrative Plant Biology 2010年第8期52卷 723-734页

作者： Kentaro Ifuku Seiko ishihara fumihiko Sato Graduate School of Biostudies Kyoto University

Oxygen-evolving complex （OEC） protein is the original name for membrane-peripheral subunits of photosystem （PS） II. Recently, multiple isoforms and homologs for OEC proteins have been iden- tified in the chloroplast thylakoid lumen, indicating that functional diversification has occurred in the OEC family. Gene expression profiles suggest that the Arabidopsis OEC proteins are roughly categorized into three groups： the authentic OEC group, the stressresponsive group, and the group including proteins related to the chloroplast NAD（P）H dehydrogenase （NDH） complex involved in cyclic electron transport around PSI. Based on the above gene expression profiles, molecular functions of the OEC family proteins are discussed together with our current knowledge about their functions.

关键词： NDH Molecular functions of Oxygen-Evolving Complex family Proteins in Photosynthetic Electron flow OEC PSII PPL

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

Importance of Three-Dimensional Piezoelectric Coupling Modeling in Quantitative Analysis of Piezoelectric Actuators

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Computer Modeling in Engineering & Sciences 2023年第8期136卷 1187-1206页

作者： Daisuke ishihara Prakasha Chigahalli Ramegowda Shoichi Aikawa Naoki Iwamaru Department of Intelligent and Control Systems Kyushu Institute of TechnologyIizukaFukuoka820-8502Japan Institute of Microelectronics Agency for ScienceTechnology and ResearchInnovis Tower138634Singapore

This paper demonstrates the importance of three-dimensional(3-D)piezoelectric coupling in the electromechanical behavior of piezoelectric devices using three-dimensional finite element analyses based on weak and strong coupling models for a thin cantilevered piezoelectric bimorph *** is found that there is a significant difference between the strong and weak coupling solutions given by coupling direct and inverse piezoelectric effects(i.e.,piezoelectric coupling effect).In addition,there is significant longitudinal bending caused by the constraint of the inverse piezoelectric effect in the width direction at the fixed end(i.e.,3-D effect).Hence,modeling of these effects or 3-D piezoelectric coupling modeling is an electromechanical basis for the piezoelectric devices,which contributes to the accurate prediction of their behavior.

关键词： Piezoelectric coupling effect piezoelectric bimorph actuator weak coupling strong coupling three-dimensional finite element analysis

Systematic review:Eosinophilic esophagitis in Asian countries

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World Journal of Gastroenterology 2015年第27期21卷 8433-8440页

作者： Yoshikazu Kinoshita Norihisa Ishimura Naoki Oshima Shunji ishihara Department of Gastroenterology and Hepatology Shimane University School of Medicine

AIM: to investigate the prevalence and the clinical characteristics of Asian patients with eosinophilic ***: We conducted a systematic search of the Pub Med and Web of Science databases for original studies, case series, and individual case reports of eosinophilic esophagitis in Asian countries published from January 1980 to January 2015. We found 66 and 80 articles in the Pub Med and Web of Science databases, respectively; 24 duplicate articles were removed. After excluding animal studies, articles not written in English, and meeting abstracts, 25 articles containing 217 patients were selected for ***: Sample size-weighted mean values were determined for all pooled prevalence data and clinical characteristics. The mean age of the adult patients with eosinophilic esophagitis was approximately 50 years, and 73% of these patients were male. They frequently presented with allergic diseases including bronchial asthma, allergic rhinitis, food allergy, and atopic dermatitis. Bronchial asthma was the most frequent comorbid allergic disease, occurring in 24% of patients with eosinophilic esophagitis. Dysphagia was the primary symptom reported; 44% of the patients complained of dysphagia. Although laboratory blood tests are not adequately sensitive for an accurate diagnosis of eosinophilic esophagitis, endoscopic examinations revealed abnormal findings typical of this disease, including longitudinal furrows and concentric rings, in 82% of the cases. One-third of the cases responded to proton pump inhibitor ***: The characteristics of eosinophilicesophagitis in Asian patients were similar to those reported in Western patients, indicating that this disease displays a similar pathogenesis between Western and Asian patients.

关键词： Eosinophilic esophagitis Allergy Prevalence Symptom Endoscopy Asia Treatment

Deformation behavior and acting earth pressure of three-hinge precast arch culvert in construction process

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Underground Space 2019年第3期4卷 251-260页

作者： Yasuo Sawamura Hiroyuki ishihara Yoshinori Otani Kiyoshi Kishida Makoto Kimura Department of Civil and Earth Resources Engineering Kyoto UniversityJapan Hokkaido Branch Kajima CorporationJapan Hirose Hokyodo&Co. Ltd.Japan Department of Urban Management Kyoto UniversityJapan

The three-hinge precast arch culvert consists of two segmental precast units and three hinge *** harnesses the passive resistance of an embankment by permitting deflection,resulting in a mechanically stable ***,the design of the three-hinge precast arch culvert differs from that of a conventional culvert,prompting the mechanical behavior of the culvert to become an important *** this study,therefore,1/5 scale model tests were conducted on a three-hinge precast arch culvert to measure the changes in the inside width and earth pressure acting on the culvert at each step in order to investigate the culvert’s mechanical behavior at each construction ***,the deflection measurement of the culvert was obtained at the in-situ construction *** results indicate that the arch members were displaced according to the embankment depth in a similar manner to the design ***,the horizontal earth pressure,which was larger than the earth pressure at rest,acted on the culvert at the end of its construction.

关键词： Precast arch culvert Construction process Coefficient of earth pressure Inside width