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Watanabe, Shunsuke
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Experimental Study of Aerodynamic Drag Control on Bluff Body using Synthetic Jets

Utsunomiya University-Naoto Kato, Shunsuke Watanabe, Hiroaki Hasegawa
  • Technical Paper
  • 2019-32-0538
Published 2020-01-24 by Society of Automotive Engineers of Japan in Japan
Since flow separation causes increase of the drag on bluff bodies, its control method has been studied for many years. Active control methods are currently focused as an alternative to passive ones because they impose a larger drag penalty under certain conditions. Although the effectiveness of a steady jet using suction, blowing or pulsed jets has been demonstrated, it is difficult to obtain an effect commensurate with weight increase because the mechanism is complicated.One method of solving this problem is a synthetic jet. Synthetic jets are produced by periodic ejection and suction of fluid from an orifice induced by oscillation of a diaphragm inside a cavity. Small engine powered vehicles demand less drag, a compact package and light weight because the drivers expect fuel efficiency, load capacity and economy. Synthetic jets can supply them because they contribute drag reduction and require only simple components.In this study, the influence of synthetic jets on the drag of a simple bluff body representing a road vehicle is measured. Drag measurement was performed by varying synthetic jet parameters: jet…
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Design of Steer-by-Wire Control Based on Vehicle Dynamic Control Theory

Tokyo University of Agriculture and Technology-Masao Nagai, Pongsathorn Raksincharoensak, Shunsuke Watanabe, Masaya Yamada
  • Technical Paper
  • 2005-03-0223
Published 2005-08-22 by Society of Automotive Engineers of Korea in South Korea
This paper describes the design approach of steer-by-wire system based on vehicle dynamics control theory for enhancing handling performance and active safety of vehicle. The front tire steering angle is actively controlled with the application of yaw rate model matching control theory by using linear inverse dynamics for enhancing handling performance. The desired yaw rate is set to be the yaw rate of zero-sideslip, four-wheel-steering vehicle for improving vehicle responsiveness. Thus, the steering gear ratio of SBW is varied based on vehicle dynamics control theory. Moreover, the driver's time delay in steering operation is also compensated with derivative steering which is to driver's individual characteristics. The effectiveness of steer-by-wire was verified by using the micro-size electric vehicle and the passenger car equipped with steer-by-wire system.
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A Study on Behavior of Vehicle-Pedestrian Collision Using Scale Model

Kei Uchibori, Shunsuke Watanabe, Hideo Sakai, Masaaki Morisawa
  • Technical Paper
  • 2004-08-0592
Published 2004-10-27 by Society of Automotive Engineers of Japan in Japan
The purpose of this research is to investigate the human body behavior at car- pedestrian collision by using scale models. Here, the rigidity of the bonnet is changed, and the relation between the bonnet energy absorption and the head injury value is obtained. Moreover, the relation between the human body behavior and the head injury value is requested when existing the direction difference of the human body.
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Steering Control of Steer-by-Wire Vehicle for Enhancing Handling and Stability

Shunsuke Watanabe, Pongsathorn Raksincharoensak, Motoki Shino, Masao Nagai
  • Technical Paper
  • 2004-08-0161
Published 2004-05-19 by Society of Automotive Engineers of Japan in Japan
This paper proposes control law of active front steering by utilizing steer-by-wire strategy to enhance vehicle handling and stability. To make vehicle trace the desired yaw rate, the steering control system consists of feedforward compensator, which is determined as a function of vehicle speed and steering wheel angle, and yaw rate feedback compensator as disturbance observer. The effectiveness of control system on enhancing vehicle maneuverability and disturbance rejection is clarified by using computer simulations and experiments using newly implemented microscale electric vehicle NOVEL-II.