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This paper presents the effect of the rotational speed of a check ball in a hydraulic L-tube on the translational motion caused by the Magnus effect. A spring-driven ball check valve is one of the most important components of a hydraulic system and controls the position of the ball to prevent backflow. To simplify the structure, the springs must be eliminated. To this end, it is necessary to clarify the flow pattern of the check ball in an L-shaped pipe and the rotational and translational behaviors of the ball. In this study, the position of the inlet pipe and the availability of the check were determined using Computer Aided Engineering (CAE) tools. By moving the position of the inlet pipe from the top to the bottom of the housing, the direction of the rotation of the ball was reversed, and the behavior changed significantly. It was found that the Magnus force, which causes the ball to levitate by rotating it in the opposite direction to the flow, acts to shorten the floating time.
Shinji Kajiwara. Evaluation of Magnus Force on Check Ball Behavior in a Hydraulic L Shaped Pipe. Fluids 2021, 6, 191 .
AMA StyleShinji Kajiwara. Evaluation of Magnus Force on Check Ball Behavior in a Hydraulic L Shaped Pipe. Fluids. 2021; 6 (5):191.
Chicago/Turabian StyleShinji Kajiwara. 2021. "Evaluation of Magnus Force on Check Ball Behavior in a Hydraulic L Shaped Pipe." Fluids 6, no. 5: 191.
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.
Shinji Kajiwara. Motion Dynamics Control of Electric Vehicles. New Trends in Electrical Vehicle Powertrains 2019, 1 .
AMA StyleShinji Kajiwara. Motion Dynamics Control of Electric Vehicles. New Trends in Electrical Vehicle Powertrains. 2019; ():1.
Chicago/Turabian StyleShinji Kajiwara. 2019. "Motion Dynamics Control of Electric Vehicles." New Trends in Electrical Vehicle Powertrains , no. : 1.
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).
Shinji Kajiwara. Passive variable rear-wing aerodynamics of an open-wheel racing car. Automotive and Engine Technology 2017, 2, 107 -117.
AMA StyleShinji Kajiwara. Passive variable rear-wing aerodynamics of an open-wheel racing car. Automotive and Engine Technology. 2017; 2 (1-4):107-117.
Chicago/Turabian StyleShinji Kajiwara. 2017. "Passive variable rear-wing aerodynamics of an open-wheel racing car." Automotive and Engine Technology 2, no. 1-4: 107-117.
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.
S. Kajiwara. Evaluation of driver’s mental workload by facial temperature and electrodermal activity under simulated driving conditions. International Journal of Automotive Technology 2014, 15, 65 -70.
AMA StyleS. Kajiwara. Evaluation of driver’s mental workload by facial temperature and electrodermal activity under simulated driving conditions. International Journal of Automotive Technology. 2014; 15 (1):65-70.
Chicago/Turabian StyleS. Kajiwara. 2014. "Evaluation of driver’s mental workload by facial temperature and electrodermal activity under simulated driving conditions." International Journal of Automotive Technology 15, no. 1: 65-70.
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.
Shinji Kajiwara. Experimental Observations of the Fluid Flow within the L-Shaped Check Valve. International Journal of Fluid Power 2013, 14, 17 -23.
AMA StyleShinji Kajiwara. Experimental Observations of the Fluid Flow within the L-Shaped Check Valve. International Journal of Fluid Power. 2013; 14 (1):17-23.
Chicago/Turabian StyleShinji Kajiwara. 2013. "Experimental Observations of the Fluid Flow within the L-Shaped Check Valve." International Journal of Fluid Power 14, no. 1: 17-23.