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Asharif, Faramarz,Shiro, Tamaki,Teppei, Hirata,Nagado, Tsutomu,Nagata, Tomokazu The Institute of Electronics and Information Engin 2013 IEIE Transactions on Smart Processing & Computing Vol.2 No.4
The main aim of this study was to suppress the angular velocity against strong winds during storms and analyze the stability and performance of the phase plane method. The utilization of small-scale wind turbine system has become common in agriculture, houses, etc. Therefore, it is considered to be a scheme for preserving the natural energy or avoiding the use of fossil fuels. Moreover, settling small-scaled wind turbines is simpler and more acceptable compared to ordinary huge wind turbines. In addition, after converting the energy there is no requirement for distribution. Therefore, a much lower cost can be expected for small-scaled wind turbines. On the other hand, this system cannot be operated continuously because the small-scaled wind turbine consists of a small blade that has low inertia momentum. Therefore, it may exceed the boundary of angular velocity, which may cause a fault in the system due to the centrifugal force. The aim of this study was to reduce the angular velocity by controlling the stall factor. Stall factor control consists of two control methods. One is a shock absorber that is loaded in the junction of the axis of the blade of the wind turbine gear wheel and the other is pitch angle control. Basically, the stall factor itself exhibits nonlinear behavior. Therefore, this paper confirmed the feasibility of stall factor control in producing desirable performance whilst maintaining stability.
Feedback Control of Linear-Quadratic-Integration Including Time-Delay System
Faramarz Asharif,Shiro Tamaki,Tsutomu Nagado,Tomokazu Nagata,Mohd Rashid,Mohammadreza Asharif 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
The aim of our research in this paper is to modify the system which includes Time-delay elements including closed loop system (feedback system). Time-delay will be happened during the long distance communication. Therefore, when we have a control object in a long distance, the transmitted reference signal will be delayed certainly. For this reason even though we assume the control object system is a stable system, but it will be an unstable system by time-delay elements. So, here we consider about the LQI (Linear Quadratic Integration) method including time-delay elements and finally, we analysis LQI results and its output behaviors.
Wind Behavior Analysis of Wind Protection Net System in Typhoon
Shigeru UEZATO,Maro TAMAKI,Shiro TAMAKI,Tomokazu NAGATA,Mohd Abdur RASHID 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
Field test of a wind protection net system for agricultural fields from typhoon attacks is presented. The field test was carried out in Okinawa under the real typhoon attack numbered 0210. The net system consists of 2 pieces of windbreak nets that are placed at different height with a horizontal gap. Wind speeds at several points inside and outside of the net system were measured, and the wind speed reduction ratio by the net system was calculated from the average wind speed. The wavelet transformation analysis was applied to estimate the transient fluctuation of the wind direction and speed. Three-dimensional wind vector data were analyzed to observe 3-dimensional behaviors of the wind both inside and outside of the net system.