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Driver Centric Decentralized Controller Design in Traffic Flow
Shigeru Yamamoto,Eiji Sakaguchi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this paper, we consider a decentralized control problem for suppressing the traffic jam phenomenon in traffic flow. To analyze the phenomenon, we use the so-called optimal velocity model. In the model, the optimal velocity function which is a nonlinear function of the headway of the preceding vehicle describes driver’s characteristics. Without affecting the characteristics, all vehicles in traffic flow should be stabilized in a decentralized fashion. In this paper, we apply washout control which is a high pass filter based control method. We derive a stability condition and illustrate the effectiveness with several simulations.
Effects of blade tip profile on in-plane tensile properties of wedge-notchedpolypropylene sheet
Shigeru Nagasawa,Akihiro Yamamoto,Thepwachara Ruchirabha,Kazuki Umemoto 한국소성가공학회 2018 플라스틱가공 심포지엄(한일 공동 세미나) Vol.2018 No.8
In this work a tensile characteristic of 0.2mm thickness polypropylene (PP) sheet subjected to indentation of a virgin and a brunt wedge (apex angle of α=42°, tip thickness of w=6㎛, 20㎛) was experimentally investigated. In order to reveal the effect of mechanical condition, such as a notched depth and profile of root surface on the breaking behavior of the half-cut PP specimen, the in-plane uni-axial tensile test was carried out by varying the indentation depth and the tensile velocity. Through the experiments, the breakage behavior of scored (half-cut) zone was characterized with the indentation depth, the tip thickness and the strain rate. The crazing by the brunt wedge decreases the tensile resistance and the burr elongation for the indentation depth larger than 0.9, whereas the work-hardening by the brunt wedge increases them for the indentation depth less than 0.8. When using the virgin wedge and/or under a high strain rate larger than 0.01 s<SUP>-1</SUP>, the breakage of half-cut zone of PP sheet became brittle, namely the tensile resistance and the burr elongation were decreased.
Unstructured-Mesh-Based Simulation for Subsonic and Supersonic Flow Control with a Plasma Actuator
Junya Yamamoto,Koji Shimoyama,Shinkyu Jeong,Shigeru Obayashi,Takashi Matsuno,Hiromitsu Kawazoe 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
A plasma actuator is a simple device that can control flow with low power supply, so this is very practical and several applications have been proposed by many researchers. In this paper, a numerical method for simulating the flow with a plasma actuator is proposed, and it is applied to supersonic flow as well as subsonic flow. This method adopts unstructured mesh so that it can be employed for complex geometries. A numerical model proposed by Suzen et al. is used for simulating the phenomena caused by a plasma actuator, and TAS-code is employed for the flow field prediction. First, this paper validated the proposed method through two test calculations for subsonic flow; the Hump model used at CFD validity workshop in NASA Langley and then the NACA0015 airfoil. According to the results of the subsonic test calculations, the present method was able to predict the effects of the plasma actuator to the flow separation correctly. Finally, a calculation with the ramp model is conducted to control the shock wave, and its capability to control the shock wave through the shift in the shock wave location was confirmed.
A Simple Tuning Method for a Class of Feedforward Controllers Utilizing PID
Masataka Hamada,Shigeru Yamamoto 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
We consider a tuning problem for a class of feedforward controllers for a given closed-loop system with an unknown plant by only using of the input and output measurements. The feedforward controllers which should be tuned are implemented as a unity feedback system of a conventional PID controller. Hence, the feedforward controller is just tuned by the PID parameters which is implemented in the controller. In this paper, we propose a direct method to obtain a suitable PID parameter to produce a desired response based on a data matching approach.
Oe, Yusuke,Yamamoto, Akinori,Mariko, Shigeru The Ecological Society of Korea 2011 Journal of Ecology and Environment Vol.34 No.2
We studied temperature sensitivity characteristics of soil respiration during periods of rising and falling temperatures within a common temperature range. We measured soil respiration continuously through two periods (a period of falling temperature, from August 7, 2003 to October 13, 2003; and a period of rising temperature from May 2, 2004 to July 2, 2004) using an open-top chamber technique. A clear exponential relationship was observed between soil temperature and soil respiration rate during both periods. However, the effects of soil water content were not significant, because the humid monsoon climate prevented soil drought, which would otherwise have limited soil respiration. We analyzed temperature sensitivity using the $Q_{10}$ value and $R_{ref}$ (reference respiration at the average temperature for the observation period) and found that these values tended to be higher during the period of rising temperature than during the period of falling temperature. In the absence of an effect on soil water content, several other factors could explain this phenomenon. Here, we discuss the factors that control temperature sensitivity of soil respiration during periods of rising and falling temperature, such as root respiration, root growth, root exudates, and litter supply. We also discuss how the contribution of these factors may vary due to different growth states or due to the effects of the previous season, despite a similar temperature range.
Robust Washout Control for Supporting Bicycle Riding
Kotaro Shima,Shigeru Yamamoto,Takashi Takimoto 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this paper, we consider a reduction problem of vibration in riding and rider’s burden by stabilizing the bicycle at slow speed. In riding a bicycle, the reference input which is generally required by feedback methods is implicitly determined by a rider. Hence, the preassigned reference input may be biased against the rider’s intention. To compensate the bias, we adopt robust washout control which can asymptotically reject the influence of the bias and is robust against the speed fluctuation of the bicycle. Furthermore, by introducing a scaling in designing robust washout control, we improve the resulting control performance.
Polyethylene film 의 부분방전열화와 역학적 특성
황명환,야마모토시게루 한국산업안전학회 1989 한국안전학회지 Vol.4 No.1
低密度 polyethylene film을 冷延伸된 方向에 對해서 直角方向으로 延伸하면, 延伸比 1.2∼1.8 付近에서 部分放電에 의한 劣化가 顯著히 增加하고, Void發生에 의한 部分放電開始電壓이 低下한다. 延伸 film에 對해 强制振動法에 의해 求한 彈性率 빛 力學的 tan δ는 上記의 延伸比付近에서 各各 極小 및 極大를 나타내고, 上記의 電氣的特性과 密接한 關係가 있다. 더욱이 微結晶은 延伸에 의해 작은 緖晶으로 分解되는 것을 X線回折 認定할 수 있고, 또한 非晶領域의 分子鎖는, 高延伸에서 再配向하는 것을 赤外吸收에 의해 認定할 수 있다. Deterioration induced by partial discharge was investigated for low-density polyethylene samples. Under an electrical field, a cold-drawn PE film was stretched perpendicularly to the direction of the original drawing, The starting voltage of the discharge shows a minimum at the draw ratio of 1.2 to 1.8. Around the same draw ratio, the elastic modulus and mechanical loss factor (tan δ) of the sample exhibit a minimum and a maximum, respectively. According to the X-ray analysis, the size of microcrystals decreases with increasing draw ratios. Reorientation of the molecular chains was observed above a draw ratio of 1.5 by the IR method.
Yusuke Oe,Akinori Yamamoto,Shigeru Mariko 한국생태학회 2011 Journal of Ecology and Environment Vol.34 No.2
We studied temperature sensitivity characteristics of soil respiration during periods of rising and falling temperatures within a common temperature range. We measured soil respiration continuously through two periods (a period of falling temperature, from August 7, 2003 to October 13, 2003; and a period of rising temperature from May 2, 2004 to July 2,2004) using an open-top chamber technique. A clear exponential relationship was observed between soil temperature and soil respiration rate during both periods. However, the effects of soil water content were not significant, because the humid monsoon climate prevented soil drought, which would otherwise have limited soil respiration. We analyzed temperature sensitivity using the Q_(10) value and R_(ref) (reference respiration at the average temperature for the observation period) and found that these values tended to be higher during the period of rising temperature than during the period of falling temperature. In the absence of an effect on soil water content, several other factors could explain this phenomenon. Here, we discuss the factors that control temperature sensitivity of soil respiration during periods of rising and falling temperature, such as root respiration, root growth, root exudates, and litter supply. We also discuss how the contribution of these factors may vary due to different growth states or due to the effects of the previous season, despite a similar temperature range.