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YUKIO, MATSUI,SHUJI, KIMURA 경상대학교 공과대학 항공기계공학부 1999 WORKSHOP 자료집 Vol.1999 No.1
Nitrogen oxide (Nox) and particulate matter (PM) emissions of diesel vehicles are regarded as a source of air pollution, and there is a global trend to enforce more stringent regulations on these exhaust gas constituents in the early years of the-21st century. On the other hand, the excellent thermal efficiency of diesel engines is certainly a welcome attribute from the standpoints of conserving energy and curbing global warming. Recently, many research institutes around the world have been using high-efficiency direct-injection (DI) diesel engines to research emission control technologies. The authors have also been researching emission control technologies using a high-efficiency Di diesel engine. As a result of this work, we have developed a new combustion concept, called Modulated Kinetics (MK), that reduces NOx and smoke simultaneously through low-temperature combustion and premixed combustion, respectively This paper describes the combustion and emission characteristics obtained when this new combustion concept was applied to a single-cylinder engine and a multi-cylinder engine. It also shows the possibility of obtaining high-efficiency, ultra-clean internal combustion engines for the 21 st century.
Parameter Identification of Elastic Multilayered System in Consideration of Measurement Accuracy
Matsui, Kunihito,KIKITA, Yukio,ABE, Yoshihisa,Watanabe, Noriaki 대한기계학회 1996 International Sessions in Celebration of the 50th Vol.1 No.1
A method to estimate layer moduli of an elastic multi-layer system from impulsive force on the surface of the system and the corresponding surface deflections is presented. Large degrees of freedom required to describe the system by FEM are drastically reduced by employing Ritz vectors. Scaling of a normal matrix is introduced to decrease a condition number of the matrix. The normal equation is solved by singular value decomposition considering a possible reduction of the normal matrix based on the criterion that reflects the accuracy of the measurement data and the precision of the floating-point arithmetic being used.
Study on Vibration Perception by Visual Sensation Considering Probability of Seeing
Kawana, Seizou,Tamura, Yukio,Matsui, Masahiro Council on Tall Building and Urban Habitat Korea 2012 International journal of high-rise buildings Vol.1 No.4
Wind-induced vibrations of buildings can be perceived when movement of objects caused by the vibration is seen. However, movement of objects that would normally be expected to trigger visual perception of building vibrations is not necessarily seen in actual building environments. Therefore, to evaluate habitability to building vibrations, it is necessary to examine the influence of movement of objects on vibration perception taking into account probability of seeing the objects. As the first step in this study, those data necessary to estimate probability of vibration perception from seeing of swaying objects have been measured during normal activities in actual buildings. In addition, statistical analysis of the data has also been carried out. As the second step in this study, the probability distribution of vibration perception by visual sensation is estimated using the series of data measured in the first step. Probability of seeing object is considered in the estimated probability distribution.
Two-Dimensional Imaging of Early Stage of Soot Formation in Diesel Spray Flame by LIF technique
Hidenori Kosaka,Tetsuya Aizawa,Yukio Matsui 한국자동차공학회 2001 한국자동차공학회 Symposium Vol.- No.-
To investigate the structure of reaction zone and the early process of young soot formation in a diesel spray flame, CH radical and polycyclic aromatic hydrocarbons formed in a flame were visualized two-dimensionally and simultaneously, CH radical was used as the indicator of reaction zone in a flame because CH is produced and destroyed in fuel decomposition zone and exists in thin layer near the stoichiometric contour in a flame, For the visualization of early soot formation zone in a flame, the polycyclic aromatic hydrocarbons (PAH) were used as tracers in LIF technique, PHA are well known as the precursors of young soot.<br/> A Nd:Y AG pumped dye laser was used as a light source. The wavelength of incident light was tuned to 390.58 nm to excite CH with the 01(8.5) transition of B²Σ-X²Ⅱ v '=0, v "=0) band. The sheet of light passed through the mid-plane of the flame and the LIF from the species in a flame were imaged by an ICCD camera. A narrow band optical filter with a central wavelength of 430 nm and a FWHM of 10 nm was used to detect the fluorescence from CH with the transition of A²Σ -X²Ⅱ (v '=0, v "=0) band. The LIF spectrum of PAH formed in a flame was detected by a spectrometer at excitation wavelengths of 266 nm, 355 nm and 390 nm. These spectrum were analyzed for identification of P AH formed in a flame.<br/> In preliminary experiments, CH and PAH formed in a diffusion burner flame were visualized two-dimensionally. Methane and propane were used as fuel. In the LIF images of gas jet diffusion flames, LIF of CH can be observed as the very thin layers with the width of less than 1 mm located in the flame periphery. In the central region surrounded by CH thin layer, the strong LIF from PAH can be seen. The LIF from central region of the jet has broad spectrum whose peak is at 440 nm.<br/>
Effect of building proximity on external and internal pressures under tornado-like flow
Sabareesh, G.R.,Cao, Shuyang,Wang, Jin,Matsui, Masahiro,Tamura, Yukio Techno-Press 2018 Wind and Structures, An International Journal (WAS Vol.26 No.3
Tornadoes are one of the world's deadliest natural phenomena. They are characterized by short life span and danger. It has been observed through post-damage surveys that localities with large numbers of buildings suffer major damage during a tornado attack resulting in huge loss of life and property. Thus,it is important to study interfering buildings exposed to tornado-like vortices. The present study focuses on external and internal pressures developed on building models exposed to translating tornado-like vortices in the presence of an interfering building model. The effects of translating speed and swirl ratio of a tornado-like vortex on external and internal pressures for a principal building in the vicinity of an interfering building are investigated. Results indicate that external and internal pressures are enhanced or reduced depending on the location of the interfering building with respect to the principal building.
Effect of building proximity on external and internal pressures under tornado-like flow
G.R. Sabareesh,Shuyang Cao,Jin Wang,Masahiro Matsui,Yukio Tamura 한국풍공학회 2018 Wind and Structures, An International Journal (WAS Vol.26 No.3
Tornadoes are one of the world\'s deadliest natural phenomena. They are characterized by short life span and danger. It has been observed through post-damage surveys that localities with large numbers of buildings suffer major damage during a tornado attack resulting in huge loss of life and property. Thus,it is important to study interfering buildings exposed to tornado-like vortices. The present study focuses on external and internal pressures developed on building models exposed to translating tornado-like vortices in the presence of an interfering building model. The effects of translating speed and swirl ratio of a tornado-like vortex on external and internal pressures for a principal building in the vicinity of an interfering building are investigated. Results indicate that external and internal pressures are enhanced or reduced depending on the location of the interfering building with respect to the principal building.