Masayuki OCHIAI
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View article: Tribological Evaluation of Biomimetic Shark Skin with Poly-DL-Lactic Acid (PDLLA) Nanosheets with Human Fingerprint Sliding Behavior
Tribological Evaluation of Biomimetic Shark Skin with Poly-DL-Lactic Acid (PDLLA) Nanosheets with Human Fingerprint Sliding Behavior Open
This study evaluates the tribological properties of poly-DL-lactic acid (PDLLA) nanosheets attached to shark-skin surfaces with varying textures. The main goal was to assess friction reduction in samples with different surface textures and…
View article: The effect of inner ring groove on leakage reduction in dry gas seals and its visualization verification
The effect of inner ring groove on leakage reduction in dry gas seals and its visualization verification Open
This study investigates the impact of incorporating an Inner Ring Groove (IRG) on the leakage characteristics of dry gas seals, commonly used in turbomachinery such as gas turbines and compressors. The primary objective is to enhance seali…
View article: Evaluation of Static and Dynamic Characteristics of Bump Metal Mesh Foil Bearing
Evaluation of Static and Dynamic Characteristics of Bump Metal Mesh Foil Bearing Open
Gas foil bearings, which are oil-free and exhibit low energy losses, are used in high-speed rotating machinery. Because gas is used as the working fluid, there is a need to improve damping performance using support structures. Additionally…
View article: A STUDY ON MEASURES TO PROMOTE OF “AREA RENOVATION” UTILIZING IDLE WAREHOUSES IN EAST TOKYO AREA
A STUDY ON MEASURES TO PROMOTE OF “AREA RENOVATION” UTILIZING IDLE WAREHOUSES IN EAST TOKYO AREA Open
The purpose of this research is to clarify measures to promote "area renovation" which revitalizes entire areas by renovating idle warehouses in order to renew declining warehouse districts of Japan. This paper examines the characteristics…
View article: Observation of Oil Film Behavior around Microbubbles on Journal Bearings Utilizing Photochromic Visualization Technique
Observation of Oil Film Behavior around Microbubbles on Journal Bearings Utilizing Photochromic Visualization Technique Open
View article: Characterization of floating bush bearings with different clearance ratios and observation of their double oil film by X-ray CT
Characterization of floating bush bearings with different clearance ratios and observation of their double oil film by X-ray CT Open
View article: A STUDY ON WAY TO UTILIZE “WAREHOUSE RENOVATION” FOR REVITALIZATION OF “MINATOMACHI” IN JAPAN —FOCUSING ON THE AREA COMPOSITION OF PORTS REGISTERED AS “MINATO OASIS”—
A STUDY ON WAY TO UTILIZE “WAREHOUSE RENOVATION” FOR REVITALIZATION OF “MINATOMACHI” IN JAPAN —FOCUSING ON THE AREA COMPOSITION OF PORTS REGISTERED AS “MINATO OASIS”— Open
本研究は,わが国の港湾における地域活性化に向けた取り組みとして,「みなとオアシス」制度において港湾の既存ストックである港湾倉庫を有効活用する「倉庫リノベーション」に着目し,その普及・促進方策を提示することを目的としている.本稿では,「みなとオアシス」登録82港を対象に,「みなとオアシス」登録範囲に着目し,港湾および背後の市街地のエリア構成との関係を捉えるとともに,その中で倉庫転用がみられた事例を取り上げ,リノベーション倉庫の活用実態を明らかにすることで,「みなとまち」活性化…
View article: Multiphase Flow Simulation in the Gap of Grooved Bearing Using Sharp Interface Model
Multiphase Flow Simulation in the Gap of Grooved Bearing Using Sharp Interface Model Open
A two-phase flow simulation was applied to the flow in the bearing gap using the level set method and the ghost fluid method, which is a sharp interface model. The immersed boundary method was used to define an object with a herringbone-sh…
View article: Estimation of spray flow characteristics using ensemble Kalman filter
Estimation of spray flow characteristics using ensemble Kalman filter Open
Spray flows are widely used in several industrial applications, such as combustion engines. Accurate measurement of spray flow characteristics requires sophisticated equipment and techniques. In recent years, the discrete droplet method (D…
View article: Temperature Distribution Measurement and Internal Flow Visualization in the Lubrication Film of Non-contacting Mechanical Seals
Temperature Distribution Measurement and Internal Flow Visualization in the Lubrication Film of Non-contacting Mechanical Seals Open
The surface textures of non-contacting mechanical seals form a few micrometers thick lubrication film that aids in achieving high performance of the seal. Improved texture design can control internal fluid flow, improving the sealing perfo…
View article: Groove Shape Optimization on Dry Gas Seals
Groove Shape Optimization on Dry Gas Seals Open
In this paper, a topological optimum design for the shape of a groove in a dry gas seal is described. Dry gas seals are widely used in high speed and high pressure rotating machinery such as gas turbines, compressors, and so on because of …
View article: Flow visualization of non-contacting mechanical seals with bidirectional rotation
Flow visualization of non-contacting mechanical seals with bidirectional rotation Open
Non-contacting mechanical seals are used as a shaft seal in a turbomachinery. A few micrometers thin lubrication film is formed by grooves on the seals. Various groove shapes were presented, and most of these grooves were designed for unid…
View article: Augmentation of Cross-Sectional Spray Measurements with Discrete Droplet Model Using Ensemble Kalman Filter
Augmentation of Cross-Sectional Spray Measurements with Discrete Droplet Model Using Ensemble Kalman Filter Open
Spray flows containing droplets and particles are used in various industrial fields. In this study, we investigate an efficient and reliable way to predict the spray flow of droplets by combining the discrete droplet model (DDM) with ensem…
View article: Estimation of Surface Temperature on Traction Roller by Using the Therom-Fluid Dynamic Analysis Model
Estimation of Surface Temperature on Traction Roller by Using the Therom-Fluid Dynamic Analysis Model Open
Traction drives is devices that transmits power by the shear stress of the lubricating oil supplied between the rolling elements. Since the designing traction drives based on the traction coefficient, it is necessary to know the traction c…
View article: Estimation of Spray Flow Characteristics Using Ensemble Kalman Filter
Estimation of Spray Flow Characteristics Using Ensemble Kalman Filter Open
View article: Study on Measurement Method of Oil Film Thickness at EHL Contact Point in Traction Drives under High Speed by Using GMFT Method
Study on Measurement Method of Oil Film Thickness at EHL Contact Point in Traction Drives under High Speed by Using GMFT Method Open
In recent years, high-speed motors combined with traction-type reduction reducers have been considered to reduce the size and weight of electric vehicle power systems and increase their efficiency. A traction drive is a device that applies…
View article: A STUDY ON THE MEASURES TO PROMOTE “WAREHOUSE RENOVATION” IN WATERFRONT OF JAPAN—FOCUSING ON THE LEGAL SYSTEM OF 16 PORTS REGISTERED AS “MINATO OASIS”—
A STUDY ON THE MEASURES TO PROMOTE “WAREHOUSE RENOVATION” IN WATERFRONT OF JAPAN—FOCUSING ON THE LEGAL SYSTEM OF 16 PORTS REGISTERED AS “MINATO OASIS”— Open
本研究は,わが国の港湾において機能転換が求められる遊休港湾の再生手法として,港湾の既存ストックである港湾倉庫を転用し活用する「倉庫リノベーション」に着目し,その促進方策を提示することを目的としている.本稿では,港湾を核とした「みなとまちづくり」を促進する「みなとオアシス」に登録された港湾のうち,「倉庫リノベーション」がみられた16港を対象に,「みなとオアシス」エリア内のリノベーション倉庫の活用特性を捉えるとともに,港湾ごとに関わる法制度として都市計画法と港湾法の2法からリノ…
View article: Experimental Evaluation of Bearing Characteristics of Bump Mesh Foil Bearing
Experimental Evaluation of Bearing Characteristics of Bump Mesh Foil Bearing Open
Foil bearings are a type of gas bearing consisting of a thin metal top foil supported from behind by an elastic body. Therefore, the bearing characteristics of a foil bearing are highly dependent on the support structure, and there is a ne…
View article: Effect of Atomization of Impact Droplets by Surface Texturing using High-Speed Camera
Effect of Atomization of Impact Droplets by Surface Texturing using High-Speed Camera Open
The promoting evaporation of urea-water solution by atomization is required to improve the purification efficiency of NOx for the urea SCR system. This study proposed an innovative method of atomization which processed a surface texture to…
View article: Effect of Micro Bubble on Stirring Resistance of Traction Roller
Effect of Micro Bubble on Stirring Resistance of Traction Roller Open
Motors for electric vehicles are expected to be equipped with reduction gears for traction drives suitable for high-speed rotation to make them smaller and more efficient. However, if a large amount of lubricating oil is supplied, large ag…
View article: Development of Dragonfly Type MAV Introduced Lead-Lag Motion for Attitude Control
Development of Dragonfly Type MAV Introduced Lead-Lag Motion for Attitude Control Open
In recent years, flapping-wing MAV that mimic flying organisms have been attracting attention. In particular, dragonfly has been considered to be an ideal model for MAV due to its excellent locomotion and energy efficiency. In general, to …
View article: Visualization of Support Structure and Measurement of Deformation in Foil Bearings Under Operation using X-ray CT Inspection System
Visualization of Support Structure and Measurement of Deformation in Foil Bearings Under Operation using X-ray CT Inspection System Open
Since the deformation of the support structure on a foil bearing greatly affect to the bearing performances, various types of support structures had been presented. However, these structures tend to become more complex, and it is difficult…
View article: Observation of changes in meniscus around the EHL contact part by change of oil supply condition
Observation of changes in meniscus around the EHL contact part by change of oil supply condition Open
Meniscus and cavitation are formed around the EHL contact area of rolling elements in many machinery. Their shape affects to the lubrication state of the EHL contact area. Especially if the rear part of the meniscus breaks, the amount of l…
View article: A STUDY ON THE ACTUAL SITUATION AND MAINTENANCE PROCESS OF “WAREHOUSE RENOVATION” —FOCUSING ON PORTS REGISTERED IN “MINATO OASIS” OF JAPAN—
A STUDY ON THE ACTUAL SITUATION AND MAINTENANCE PROCESS OF “WAREHOUSE RENOVATION” —FOCUSING ON PORTS REGISTERED IN “MINATO OASIS” OF JAPAN— Open
本研究は，わが国の港湾において地域活性化に資する港湾空間の再編成が求められる中，港の既存ストックである上屋や倉庫を有効活用した「倉庫リノベーション」による再編成手法の構築を目的としている．そこで，本稿では港湾空間における倉庫活用の全国的な傾向とその整備実態を把握するため，港を核とした地域活性化策であり既設の港湾施設等を活用する「みなとオアシス」に着目し，登録港湾106港を対象に資料調査および国土交通省への聞き取り調査を行った．その結果より，港湾の重要度を示す「港格」ごとに「…
View article: Study on Transport of Lubricating Oil and Fuel in Automobile Engine Using Gas-liquid-liquid Three-phase Flow Simulation Considering Moving Object
Study on Transport of Lubricating Oil and Fuel in Automobile Engine Using Gas-liquid-liquid Three-phase Flow Simulation Considering Moving Object Open
We predicted the transport of fuel around the piston rings with the post injection by multiphase flow simulation based on computational fluid dynamics. We validated proposed numerical method based on dam break test with respect to the mixi…
View article: Basic study on topological optimization of support structure in foil bearings
Basic study on topological optimization of support structure in foil bearings Open
Gas foil bearings are one of air bearings with a flexible bearing surface that can support the shaft in a stable condition. As a result, they have a higher damping performance than other air bearings. Since bearing characteristics is deepl…
View article: The Multiphase Flow CFD Analysis in Journal Bearings Considering Surface Tension and Oil-Filler Port Flow
The Multiphase Flow CFD Analysis in Journal Bearings Considering Surface Tension and Oil-Filler Port Flow Open
This chapter presents the multiphase computational fluid dynamics (CFD) analysis on oil-lubricated high-speed journal bearings considering the oil-filler port. Journal bearings are widely used for high-speed rotating machinery such as turb…
View article: Prediction of oil behavior in piston ring groove based on gas-liquid two-phase flow analysis
Prediction of oil behavior in piston ring groove based on gas-liquid two-phase flow analysis Open
In recent years, many vehicles with internal combustion engines use low tension piston rings and low viscosity oils to reduce friction loss around the rings. However, the reduction of ring tension causes problems in oil consumption. We con…
View article: Effect of the Atomization by the Dimple Aiming at an Application to Urea SCR
Effect of the Atomization by the Dimple Aiming at an Application to Urea SCR Open
Urea SCR is attracting attention as a method of removing NOx emitted from the diesel engine. However, it is required to promote vaporization by atomization, because the purification efficiency of NOx is lowered by the urea-water that is no…
View article: Influence of Internal Flow in Lubrication Film on Temperature Distribution of Non-Contact Mechanical Face Seals
Influence of Internal Flow in Lubrication Film on Temperature Distribution of Non-Contact Mechanical Face Seals Open
Non-contact mechanical face seals are used to prevent leaking fluids around the rotating shaft in turbomachineries. On the sealing face of these seals, surface textures form the fluid lubrication film which is thin about a few micrometers.…