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Air-Fuel Ratio Controls for Clean Gasoline Engines

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Air-Fuel Ratio Controls for Clean Gasoline Engines

Effect of Double Air Injection on Performance Characteristics of Centrifugal Compressor

第三十届中国控制会议

作者： Yuji yasui Honda R＆D CO. Ltd.4630 ShimotakanezawaHaga-machiHaga-gunTochigi321-3393 Japan

ISBN: (纸本)9781457706776

＜正＞The mainstream of low emission technology for gasoline engines is an accurate air-fuel ratio *** air-fuel ratio control maintains air-fuel ratio of combustion gas at the suitable target value to maximize emission conversion efficiency of three-way *** model based controls have been applied to air-fuel ratio controls in order to meet strict emission legislations in the *** this paper,modeling methods and control algorithms for air-fuel ratio controls will be introduced.

关键词： Adaptive control Sliding mode control Air-fuel ratio Gasoline engine

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Journal of Thermal Science 2015年第1期24卷 10-16页

作者： toshiyuki Hirano Mizuki Takano Hoshio Tsujita Mechanical Engineering Course Department of Science and Engineering Kokushikan University Advanced Course of Mechanical Engineering Program Tokyo Metropolitan College of Industrial Technology 10-40Higashi-oi 1-chome Shinagawa CityTokyo 140-0011 Tokyo Japan Department of Mechanical Engineering Faculty of Science and Engineering Hosei University

In the operation of a centrifugal compressor of turbocharger, instability phenomena such as rotating stall and surge are induced at a lower flow rate close to the maximum pressure ratio. In this study, for the suppression of surge phenomenon resulting in the extension of the stable operating range of centrifugal compressor to lower flow rate, the compressed air at the compressor exit was re-circulated and injected into the impeller inlet by using the double injection nozzle system. The experiments were performed to find out the optimum circumferential position of the second nozzle relative to the fixed first one and the optimum inner diameter of the injection nozzles, which are able to most effectively reduce the flow rate of surge inception. Moreover, in order to examine the universality of these optimum values, the experiments were carried out for two types of compressors.

关键词： Centrifugal Compressor Performance Nozzle Injection Surge

Effects of wing deformation on aerodynamic performance of a revolving insect wing

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Acta Mechanica Sinica 2014年第6期30卷 819-827页

作者： Ryusuke Noda toshiyuki Nakata Hao Liu Graduate School of Engineering Chiba University 1-33 Yayoi-cho Inage-ku Chiba Japan Shanghai Jiao Tong University and Chiba University International Cooperative Research Center (SJTU-CUICRC) Structure and Motion Laboratory The Royal Veterinary CollegeUniversity of London Hawkshead LaneNorth Mymms Hatfield AL9 7TA United Kingdom

Flexible wings of insects and bio-inspired micro air vehicles generally deform remarkably during flapping flight owing to aerodynamic and inertial forces,which is of highly nonlinear fluid-structure interaction（FSI）*** elucidate the novel mechanisms associated with flexible wing aerodynamics in the low Reynolds number regime,we have built up a FSI model of a hawkmoth wing undergoing revolving and made an investigation on the effects of flexible wing deformation on aerodynamic performance of the revolving wing *** take into account the characteristics of flapping wing kinematics we designed a kinematic model for the revolving wing in two-fold：acceleration and steady rotation,which are based on hovering wing kinematics of hawkmoth,Manduca *** results show that both aerodynamic and inertial forces demonstrate a pronounced increase during acceleration phase,which results in a significant wing *** the aerodynamic force turns to reduce after the wing acceleration terminates due to the burst and detachment of leading-edge vortices（LEVs）,the dynamic wing deformation seem to delay the burst of LEVs and hence to augment the aerodynamic force during and even after the *** the phase of steady rotation,the flexible wing model generates more ver-tical force at higher angles of attack（40°–60°）but less horizontal force than those of a rigid wing *** is because the wing twist in spanwise owing to aerodynamic forces results in a reduction in the effective angle of attack at wing tip,which leads to enhancing the aerodynamics performance by increasing the vertical force while reducing the horizontal ***,our results point out the importance of the fluid-structure interaction in evaluating flexible wing aerodynamics：the wing deformation does play a significant role in enhancing the aerodynamic performances but works differently during acceleration and steady rotation,which is mainly induced by inertial force in accelerati

关键词： Insect flight Flexible wing Revolving wing Fluid-structure interaction

Prototyping of Ultra Micro Centrifugal Compressor-Influence of Meridional Configuration

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Journal of Thermal Science 2011年第4期20卷 312-317页

作者： toshiyuki Hirano Tadataka Muto Hoshio Tsujita Production Systems Engineering Course Tokyo Metropolitan College of Industrial Technology Graduate School of Engineering Hosei University3-7-2KajinochoKoganei-shiTokyo184-8584Japan Department of Mechanical Engineering Faculty of Science and EngineeringHosei University

In order to investigate the design method for a micro centrifugal compressor, which is the most important component of an ultra micro gas turbine, two types of centrifugal impeller with 2-dimensional blade were designed, manufactured and tested. These impellers have different shapes of hub on the meridional plane with each other. Moreover, these types of impeller were made for the 5 times and the 6 times size of the final target centrifugal impeller with the outer diameter of 4ram in order to assess the similitude for the impellers. The comparison among the performance characteristics of the impellers revealed the influence of the meridional configuration on the performance and the similitude of the compressors.

关键词： Ultra Micro Centrifugal Compressor Performance Characteristics Impeller Meridional Configuration

Post-analysis simulation of the collapse of an open sabo dam of steel pipes subjected to boulder laden debris flow

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International Journal of Sediment Research 2020年第6期35卷 621-635页

作者： toshiyuki Horiguchi Vincent Richefeu Department of Civil Engineering National Defense Academy Universite Grenoble Alpes Laboratoire 3SR (solsSolidesStructuresRisques)

The objective of the proposed method is to utilize a site investigation of a debris flow disaster and verify a real scale analysis to evaluate the impulsive load on an open sabo *** Nagiso debris flow disaster which occurred in Nagano in 2014,where damage caused by Typhoon Neogri was *** verification result of the site investigation demonstrated the weak components of the open Sabo dam experienced damage owing to the debris flow.A discrete element method is normally applied to a solid body to calculate an interaction function force with respect to the contact point between boulders and the *** numerical method initially concatenates elements that model the open Sabo ***,the stiffness coefficient of flanges and coupling joints between pipes was expressed to utilize the sectional partition method to determine the structural *** method was improved to separate from the connecting elements beyond the boundary *** debris flow model uses a water flow distribution model,and the debris flow flowed from 200m upstream of the open sabo ***,the proposed method was examined to verify the primary cause of damage to the open sabo dam and used to reproduce the circumstances that evaluated the impulsive load occurrence mechanism in the case of a real *** addition,the coupling joints between the hollow steel pipes utilized a’reproduction analysis’ for a real sabo dam and a‘reinforced analysis’ for a reinforced sabo dam were applied to assess the weak point of the dam.

关键词： Open sabo dam Site investigation Damage verification Discrete element method

Attenuation and Distortion of Compression Waves Propagating in Very Long Tube

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Journal of Thermal Science 2011年第1期20卷 53-57页

作者： Shinya NAKAMURA Daisuke SASA toshiyuki AOKI Graduate School of Engineering Sciences Kyushu UniversityKasugaFukuoka816-8580Japan

A lot of phenomena related to propagating various waves are seen when the high-speed train goes through the tunnel,the gas pipeline is broken due to an accident or the air brake of the wagon *** instance,a compression wave generated ahead of a high-speed train entering a tunnel propagates to the tunnel exit and spouts as a micro pressure wave,which causes an exploding *** order to estimate the magnitude correctly,the mechanism of the attenuation and distortion of a compression wave propagating along a very long tunnel must be understood and the experimental information on these phenomena is *** experimental investigation is carried out to clarify the attenuation and distortion of the propagating compression wave in a very long *** results show that the strength of a compression wave decreases with *** attenuation and distortion of compression waves are affected by the initial waveform of the compression wave and by the unsteady boundary layer induced by the propagating *** shape of a compression wave becomes different with the propagating distance;that is,a shock wave appears just head of a wavefront and an overshoot on pressure distribution is observed behind a shock wave due to the transition of the unsteady boundary layer.

关键词： Propagating Compression Wave Very Long Tube Micro-pressure Wave High-Speed Train

Study of older male drivers’driving stress compared with that of young male drivers

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Journal of Traffic and Transportation Engineering(English Edition) 2020年第4期7卷 467-481页

作者： Yannmq Zhao toshiyuki Yamamoto Ryo Kanamori Department of Civil Engineering Nagoya UniversityNagoya 464-8603Japan Institute 0f Materials and Systems for Sustainability Nagoya UniuersityNagoya 464-8603Japan Institute of Innovation for Future Society Nagoya UniversityNagoya 464-8603Japan

In this study,older male drivers’stress while driving in straight links and while proceeding through intersections is *** area network(CAN),self-reported stress(SRS),and physiological data was collected in 22.4 km-long experimental trips among older and young ***,this study finds that older drivers reported much less stress than young ***,principal components(PCs)of the physiological data demonstrate that older drivers might underrate their driving stress in entire trips,except regarding turning at ***,following other vehicles reduced older drivers’driving stress because preceding vehicles might help them control driving speed,detect the path,and prevent road *** contrast,the similar condition increased the stress level of young *** results of random effects regression models confirm that age was the significant impact factor on SRS and physiological *** examining whether the stress at intersections could affect their driving behaviors,significant difference between two age groups was found neither in turning time nor in the driving *** study also confirms that physical and mental changes with aging can negatively affect older adults’*** the relationships among stress,speed,and accidents,we suggest the provision of more driver assistance systems,training,and education and improving intersection design for older drivers.

关键词： Driving behavior Driving stress Older driver Intersection Straight road

Description of sand–metal friction behavior based on subloadingfriction model

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Friction 2022年第10期10卷 1660-1675页

作者： toshiyuki OZAKI Yuki YAMAKAWA Masami UENO Koichi HASHIGUCHI Kyushu Electric Engineering Consultants Inc. Fukuoka 810-0005Japan Department of Civil and Environmental Engineering Tohoku UniversitySendai 980-8579Japan University of the Ryukyus Okinawa 903-0213Japan MSC Software Ltd. Tokyo 101-0054Japan Kyushu University Fukuoka 819-0395Japan

A subloading-friction model is formulated to describe the smooth transient variation from static friction to kinetic friction,the recovery to static friction after the sliding velocity decreases,and the accumulation of sliding displacement under the cyclic loading of contact *** the past relevant studies,however,the model formulation used for simulations is limited to the hypoelastic-based plasticity framework,and the validation of the model is limited to simulations of the test data for metal-to-metal *** this study,the formulation of the subloading-friction model based on a hyperelastic-based plasticity framework is *** the fields of civil,geotechnical,agricultural engineering,and terramechanics,the interaction between soils and metals is critical,as reflected in construction and agricultural machinery,foundation piles,and retaining *** validity of the model for describing the friction between various sands and metals is verified by simulations of the experimental data under monotonic and cyclic loadings.

关键词： subloading-friction model sand-metal friction monotonic/cyclic sliding static/kinetic friction

Crystal orientation-dependent fatigue characteristics in micrometer-sized single-crystal silicon

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Microsystems & Nanoengineering 2016年第1期2卷 154-162页

作者： Tsuyoshi Ikehara toshiyuki Tsuchiya National Institute of Advanced Industrial Science and Technology(AIST) 1-2 NamikiTsukubaIbaraki 305-8564Japan Department of Micro Engineering Graduate School of EngineeringKyoto UniversityKyotodaigaku-Katsura C3Nishikyo-kuKyoto 615-8540Japan

Repetitive bending fatigue tests were performed using five types of single-crystal silicon specimens with different crystal orientations fabricated from{100}and{110}*** lifetimes in a wide range between 100 and 1010 were obtained using fan-shaped resonator test *** surface observation via scanning electron microscope(SEM)revealed that the{111}plane was the primary fracture *** crack propagation exponent n was estimated to be 27,which was independent of the crystal orientation and dopant concentration;however,it was dependent on the surface conditions of the etched *** fatigue strengths relative to the deflection angle were orientation dependent,and the ratios of the factors obtained ranged from 0.86 to *** strength factors were compared with those obtained from finite element method stress *** calculated stress distributions showed strong orientation dependence,which was well-explained by the elastic *** comparison of the strength factors suggested that the first principal stress was a good criterion for fatigue *** include comparisons with specimens tested in our previous report and address the tensile strength,initial crack length,volume effect,and effects of surface roughness such as scallops.

关键词： fatigue fracture lifetime MEMS reliability resonator single-crystal silicon