KINDAI UNIVERSITY


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KAJIWARA Shinji

Profile

FacultyDepartment of Mechanical Engineering / Graduate School of Science and Engineering Research
PositionAssociate Professor
Degree
Commentator Guidehttps://www.kindai.ac.jp/meikan/924-kajiwara-shinji.html
URL
Mail
Last Updated :2020/04/05

Research Activities

Research Areas

  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Machine elements and tribology
  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Design engineering
  • Informatics, Mechanics and mechatronics
  • Informatics, Human interfaces and interactions
  • Humanities & social sciences, Educational technology
  • Informatics, Sensitivity (kansei) informatics

Published Papers

  • Evaluation of driver status in autonomous vehicles: using thermal infrared imaging and other physiological measurements, KAJIWARA Shinji, International Journal of Vehicle Information and Communication Systems, International Journal of Vehicle Information and Communication Systems, 4(3), 232 - 241, Sep. 2019 , Refereed
    Summary:This review examines whether thermal infrared imaging is a possibility for evaluating the state of drivers in autonomous vehicles. Functional thermal infrared imaging is considered to be a promising future methodology for evaluating driver status. Observations of a driver's emotional state rely on muscle activity, subcutaneous blood flow, and sweating pattern, all driven by the sympathetic nervous system. The selection of appropriate baselines, autonomous nature of thermal prints, experimental setup, methodological problems, limitations, and future directions are all discussed. This paper thus outlines the possibility of monitoring drivers of autonomous vehicles using thermal infrared imaging.
  • Improvement in Steering Performance by Push-Pull Operation in Car Driving., KAJIWARA Shinji, International Journal of Automotive & Mechanical Engineering, International Journal of Automotive & Mechanical Engineering, 15(1), 4919 - 4934, Mar. 2018 , Refereed
    Summary:Collision avoidance is one of the most difficult driving operations in the domain of intelligent vehicles. Steering operation error is one of the causes of traffic accidents. Steering operability also contributes greatly to the comfort of drivers and their mental workload during driving. Thus, with comfortable steering operation it is possible to reduce shoulder stiffness and arm fatigue caused by long-time driving. The development of automatic driving vehicles is becoming advanced worldwide. Consequently, the goal is to implement a level 3 automatic driving vehicle for practical use, in which" the system performs the acceleration, the steering, and the braking, and the driver responds when the system requests it". For this system to be practical, when autonomous driving becomes impossible for some reason, it is important to develop a system that allows the driver to be in control regardless of driving experience or age. In conventional round steering wheel, since there is no output muscle directly involved in the direction of movement of the upper limbs, it is difficult to instantaneously exert a large force and control performance is not good. Therefore, a twin lever steering (TLS), which is a push/pull alternate steering system, is proposed in this study. In the proposed TLS, there are output muscles that are directly involved in the direction of movement of the upper limb, including the biceps brachii muscle, and it is conceivable that the motor controllability is higher than in the conventional system. In this research, the superiority of the proposed TLS was verified using an experimental racing kart and driving simulator (DS).
  • Passive variable rear-wing aerodynamics of an open-wheel racing car, KAJIWARA Shinji, Automotive and Engine Technology, Automotive and Engine Technology, 2(1-4), 107 - 117, Dec. 2017 , Refereed
    Summary:A rear wing designed to improve motoring performance and enhance stability during cornering needs to generate a large downforce at a relatively low speed. If the angle of attack of the rear wing is large, then air resistance is increased during high-speed driving, and thus, fuel consumption is increased due to the large drag values. On the other hand, the performance on high-speed cornering will improve overall lap time with an increased angle of attack. To mitigate this disadvantage, we aimed to reduce the angle of attack during high-speed driving to reduce downforce and drag and thus to reduce fuel consumption. Meanwhile, during low-speed driving, for example in cornering, the angle of attack was increased and a large downforce generated to improve driving stability. In order to achieve both goals, we developed a passive-type variable rear wing. This rear wing was designed to have a three-step shape where the second step in the center was designed to swing. We first confirmed the behavior through both computer-aided engineering analysis and wind tunnel experiments, and then we constructed a full-size rear wing and measured the downforce on a student Formula SAE vehicle. The results showed that it is possible to generate a downforce of 80 N at a low speed of 30 km/h (8.3 m/s) and a downforce of 145 N at a high speed of 50 km/h (13.9 m/s).
  • Improvement in Shock-absorbing Performance of Step-climbing Machine for a Heavy Load Carrier, KAJIWARA Shinji, 17(2), 147 - 152, Jul. 2017 , Refereed
    Summary:This paper presents the development of a new step-climbing mechanism for heavy load carrier. The basic design of the proposed mechanism is illustrated, and its prototype is manufactured. Measured impact acceleration using the prototype. The results from several experiments demonstrate that this prototype is able to drive over the target step 10mm effectively. It is, therefore, shown that the proposed mechanism is effective for driving over a step. However, it was revealed that large impact acceleration occurred to the carrier when descending the step. Thus, the characteristic of shock acceleration when getting down from the step was clarified. Then it was found out that it is able to be reduced the maximum shock acceleration by using rotational dumper.
  • Tuning for a Small Engine with a Supercharger, KAJIWARA Shinji, International Scholarly and Scientific Research & Innovation, International Scholarly and Scientific Research & Innovation, 10(3), 586 - 590, Mar. 2016 , Refereed
  • Tuning for FSAE Engine with a Supercharger, KAJIWARA Shinji, SAE Technical Papers, SAE Technical Papers, 2015-32-0838, 1 - 8, Nov. 2015 , Refereed
  • Numerical Simulation and Experimental Validation of the Hydraulic L-Shaped Check Ball Behavior, KAJIWARA Shinji, International Journal of Mechanical, Aerospace, Industrial, Mechatronic and Manufacturing Engineering, International Journal of Mechanical, Aerospace, Industrial, Mechatronic and Manufacturing Engineering, 9(2), 308 - 312, Feb. 2015 , Refereed
  • Parameter Study of a Step-climbing Machine for Heavy Load Carrier, KAJIWARA Shinji, Journal of Robotics and Mechatronics, Journal of Robotics and Mechatronics, 26(3), 341 - 338, Jun. 2014 , Refereed
  • Improvement of Car Performance Limits Through Camber Control, KAJIWARA Shinji, International Journal of Engineering Reserch & Technology, International Journal of Engineering Reserch & Technology, 3(5), 1221 - 1226, Jun. 2014 , Refereed
  • Automobile Collision Behavior Using Mechanism CAE Analysis, KAJIWARA Shinji, International Journal of Engineering Reserch & Technology, International Journal of Engineering Reserch & Technology, 3(5), 935 - 939, May 2014 , Refereed
  • New Suspension Mechanism Using Camber Thrust for a Formula Car, KAJIWARA Shinji, International Journal of Mechanical, Industrial Science and Engineering, International Journal of Mechanical, Industrial Science and Engineering, 8(2), 180 - 187, Mar. 2014 , Refereed
  • EVALUATION OF DRIVER'S MENTAL WORKLOAD BY FACIAL TEMPERATURE AND ELECTRODERMAL ACTIVITY UNDER SIMULATED DRIVING CONDITIONS, S. Kajiwara, INTERNATIONAL JOURNAL OF AUTOMOTIVE TECHNOLOGY, INTERNATIONAL JOURNAL OF AUTOMOTIVE TECHNOLOGY, 15(1), 65 - 70, Feb. 2014 , Refereed
    Summary:The purpose of this study was to evaluate the mental workload of increasing driving speed, from 60 km/h to 180 km/h, when operating a driving simulator. The evaluation, based on changes in facial temperature and electrodermal activity, showed that the difference between nose and forehead temperature increased, that the skin potential level decreased, and that the skin conductance level increased. Monitoring facial teniperature and electrodermal activity were both found to be effective in evaluating the mental workload involved.
  • Experimental Analysis of Check Ball Behaviors for L-shaped Pipe, Shinji Kajiwara, Tatsuya TANAKA, International Journal of Fluid Power System, International Journal of Fluid Power System, 16(1), 1 - 7, May 2013 , Refereed
    Summary:The spring-driven ball-type check valve is one of the most important components of hydraulic systems: it controls the position of the ball and prevents backward flow. To simplify the structure, the spring must be eliminated, and to accomplish this, the flow pattern and the behavior of the check ball in the L-shaped pipe must be determined. In this paper, we present a full-scale model of a check ball made of acrylic resin, and we determine the relationship between the initial position of the ball, the diameter of the inflow port, and the kinematic viscosity of oil. When kinematic viscosity is high, the check-flow rate increases in a standard center inflow model, and it is possible to greatly decrease the check-flow rate by shifting the inflow from the center.
  • Experimental Observations of the Fluid Flow within the L-Shaped Check Valve, Shinji Kajiwara, the International Journal of Fluid Power, the International Journal of Fluid Power, 14(1), 17 - 23, Mar. 2013 , Refereed
    Summary:The spring-driven ball-type check valve is one of the most important components of hydraulic systems: it controls the position of the ball and prevents backward flow. To simplify the structure, the spring must be eliminated, and to accomplish this, the flow pattern and the behavior of the check ball in L-shaped pipe must be determined. In this paper, we present a full-scale model of a check ball made of acrylic resin, and we determine the relationship between the initial position of the ball, the diameter of the inflow port, and the kinematic viscosity of oil. When kinematic viscosity is high, the check-flow rate increases in a standard center inflow model, and it is possible to greatly decrease the check-flow rate by shifting the inflow from the center.
  • Experimental Analysis of Check Ball Behavior for L-shaped Pipe, 梶原 伸治, 田中 達也, The Japan Fluid Power System Society, The Japan Fluid Power System Society, 44(1), 23 - 28, Jan. 2013 , Refereed
  • Distance measurement by a FIR thermal imaging camera, 梶原 伸治, The 10th Asia Pacific Conference on Computer Human Interaction, The 10th Asia Pacific Conference on Computer Human Interaction, CD(ROM), 2P-32, Aug. 2012
    Summary:事故統計は夜に運転することは、日中に比べて相対的に危険であることを示している。遠赤外線を用いた熱画像カメラは、物体が発する熱放射の差に基づいて画像を生成する。これは、夜間走行のドライバーを誘導するために使用されています。残念なことに1赤外線カメラは、オブジェクト間の距離を測定することはできません。次に、それを二酸化炭素のスペクトルを吸収フィルタを使用して赤外線で距離を測定することを試みた。(英文:Google機械翻訳)
  • Presumption of Driver’s Stress Based on Pupil Diameter, 梶原 伸治, The 10th Asia Pacific Conference on Computer Human Interaction, The 10th Asia Pacific Conference on Computer Human Interaction, CD(ROM), 2P-65, Aug. 2012
    Summary:ステアリングホイールの後ろに眠気による事故を防止することは非常に望ましいことである。これを達成するために、継続的に知覚、認識と車両制御能力のドライバーの能力を推定するための手法が必要です。 心理状態を持つと視覚刺激の明るさに瞳孔径が変化します。本稿では、仮想現実ベースのドライビングシミュレータにおける瞳孔径と輝度の測定を組み合わせることにより、メンタルワークロードを推定する手法を提案する。結果は、それが定量的に明るさに対応した瞳孔径の同時変更とドライバーの覚醒を監視するのは現実的であることを示している。(英文:Google機械翻訳)
  • The Presumption of Driver Stress Based on EEG Measurements of Visual and Tactile Sensation, 梶原 伸治, JOURNAL of the school of scisence and engineering KINKI UNIVERSITY, JOURNAL of the school of scisence and engineering KINKI UNIVERSITY, 47, 9 - 14, Oct. 2011 , Refereed
    Summary:Electroencephalogram (EEG) measurement is an effective method for expressing human subjectivity. This paper presents a method for determination of presumed driver stress based on EEG measurements. The reactions of subjects were examined in a driving simulator with or without motion. The EEG was able to indicate the influences of obstruction and stimulation on the drivers. The EEG data were used for principal component analysis of the sinciput beta wave and emotion spectra analysis. Increases in the perceived stress by the subjects increased the level of the sinciput beta wave and decreased the level of the emotion spectra, making it clear that these values are correlated.
  • Improving Creative Education in Mechanical Engineering: The Paper Car Race, 梶原 伸治, 窪堀 俊文, Japanese Society for Engineering Education, Japanese Society for Engineering Education, 58(6), 34 - 39, Dec. 2010 , Refereed
    Summary:This paper describes a creative education course for second year students at the Department of Mechanical Engineering, Kinki University. During the "paper car race" competitions, students learn the entire product development process, from conceptual design to drafting to manufacturing and evaluation. Competitions include the slope climbing race, the speed race and the design contest. Students use only paper and bamboo for the axis, but are provided with the motor and battery box. The research explored the improvement in student motivation to learn mechanical engineering and mechanical design. In addition, statistical analyses were conducted to examine the correlation coefficient for the comprehensive evaluation. Student motivation did improve through the competition in which they created imaginative and original work. Many students felt that they had learned the importance of conceptual design, drafting and project management.
  • Evaluation of Driver’s Mental Workload by Facial Temperature and Electrodermal Activity under Simulated Driving Conditions, 梶原 伸治, 吉城 雄一, Human Interface Society, Human Interface Society, 12(4), 31 - 36, Aug. 2010 , Refereed
    Summary:The purpose of this study was to evaluate the mental workload of increasing driving speed, from 60
    km/h to 180 km/h, when operating a driving simulator. The evaluation, based on changes in facial
    temperature and electrodermal activity, showed that the difference between nose and forehead
    temperature increased, that the skin potential level decreased, and that the skin conductance level
    increased. Monitoring facial temperature and electrodermal activity were both found to be effective in
    evaluating the mental workload involved.
  • Performance Improvement using Electro-magnetic Engine Valves, 梶原 伸治, JOURNAL of the school of scisence and engineering KINKI UNIVERSITY, JOURNAL of the school of scisence and engineering KINKI UNIVERSITY, 45, 29 - 33, Sep. 2009
    Summary:This study presents a new type of engine valve system which is made of permanent magnets. Improvements in the car’s specific fuel consumption and engine power rate are severely studied in detail. It is tested to decrease pumping loss and to improve engine performance by flexible engine valve timing. In this paper, the effects of the electromagnetic engine valve on fuel consumption and output improvement are analyzed with an engine performance analysis tool. In addition, a core movable electromagnetic engine valve was developed by the lower power driving method. The structure of the linear actuator of its movable armature was examined with an electromagnetic field CAE analysis tool.
  • The Presumption of Driver's Stress Based on Measurement of EEG in Driving Situation on Simulator, 梶原 伸治, 田鍬 紘信, JOURNAL of the school of scisence and engineering KINKI UNIVERSITY, JOURNAL of the school of scisence and engineering KINKI UNIVERSITY, 45, 25 - 28, Sep. 2009
    Summary:Electroencephalogram (EEG) measurement is an effective method to express man's subjectivity. Driving test subjects' reactions of a driving simulator with motion or without motion were examined. In addition, the EEG was able to indicate the influences that obstruction and stimulation exerted on the drivers. Principal component analysis of the sinciput beta wave and emotion spectra analysis were performed using the obtained EEG. As the subjects perceived increasing stress, the level of the former escalated and the level of the latter decreased, making it is clear that these values are correlated.
  • CAE Optimization for Engine Design, KAJIWARA Shinji, 80 - 86, Feb. 2004 , Refereed

Books etc

  • New Trends in Electrical Vehicle Powertrains, KAJIWARA Shinji, 共著, Chapter: Motion Dynamics Control of Electric Vehicles, IntechOpen,   2018 11
    Summary:In this chapter, I will explain the dynamics of electric vehicle and the support systems of drivers in detail, considering both structure and the function of the vehicle. Furthermore, the reliability is discussed. In car development and design that I have, car dynamic control system, turn ability, comfort, and safety must all be considered simultaneously. The safety and the comfort for the driver which are connected with various road surfaces and as well as the speed depend on the physical performance of the vehicle. In this chapter, we will explain the dynamics of the vehicle and the support system of the driver in detail, considering both the structure and function of the vehicle. In the design and development of car dynamic control system, turn ability, comfort, and safety must all be considered simultaneously. The safeness and comfort during a drive on various road surfaces and speed depend on the performance of these basic abilities of the vehicle.

Conference Activities & Talks

  • Development of a step-climbing machine for heavy load carrier(Wheeled Robot / Tracked Vehicle (2)),   2013 05
  • Application of quick response solenoid valves to hydraulic oscillation system, KAJIWARA Shinji, Current advances in materials and processes : report of the ISIJ meeting,   2000 09 01
  • A Strand Thickness Uniformalizing Techniques of Strip Caster, KAJIWARA Shinji, Current advances in materials and processes : report of the ISIJ meeting,   1999 09 05
  • Long Life Design of Strip Cater's Roll, KAJIWARA Shinji, Current advances in materials and processes : report of the ISIJ meeting,   1999 09 05
  • Water Model Measurement of Flow in Strip Caster Mold Pool, KAJIWARA Shinji, Current advances in materials and processes : report of the ISIJ meeting,   1997 03 27
  • Heat Extraction Rate and Growth/Contraction of Solidified Region in Magma Energy Extraction, KAJIWARA Shinji, https://gbank.gsj.jp/geolis/geolis_link/199301152/ja,   1993