Takaaki Hagiwara

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A multi-period repetitive control system is a type of servomechanism for a periodic reference input. Even if a plant does not include time-delay, the transfer function from the periodic reference input to the output and that from the disturbance to the output of the multi-period repetitive control system generally have an infinite number of poles. In order(More)
In this paper, we examine the parametrization of all disturbance observers for time-delay plants with any input disturbance. The disturbance observers have been used to estimate the disturbance in the plant. Several papers on design methods of disturbance observers have been published. Recently, the parametrization of all disturbance observers for(More)
We examine a design method for robust stabilizing modified proportional– integral–derivative (PID) controllers for time-delay plants with uncertainty. The PID controller structure is very widely used in industrial applications. However, the plants to which the PID controller is applicable are restricted. Yamada, Hagiwara and Shimizu proposed a design method(More)
A multi-period repetitive control system is a type of servomechanism for a periodic reference input. Even if a plant does not include time-delay, the transfer function from the periodic reference input to the output and that from the disturbance to the output of the multi-period repetitive control system generally have an infinite number of poles. The(More)
The modified repetitive control system is a type of servomechanism for periodic reference inputs. That is, the modified repetitive control system follows the periodic reference input with a small steady state error, even if a periodic disturbance or uncertainty exists in the plant. Using previously proposed modified repetitive controllers, even if the plant(More)
The Proportional-Integral-Derivative (PID) controller structure is the most widely used one in industrial applications. However, PID controller cannot stabilize any plant. In order to overcome this problem, Yamada and Hagiwara proposed a design method for modified PID controllers such that the modified PID controller makes the control system for unstable(More)
The disturbance observers have been used to estimate the disturbance in the plant. Several papers on design methods of disturbance observers have been published. Recently, the parametrization of all disturbance observers for plants with any output disturbance was clarified. However, no paper examines the parametrization of all disturbance observers for(More)
In the present paper, we study on a control design using parallel compensation technique for multiple-input/multiple-output systems. Parallel compensation technique is applied to many control design problems such as simple adaptive control, robust control systems using phase information and the parameterization of all proper stabilizing controllers for(More)
An on-chip automatic erase technique using an internal voltage generator has been developed and has proved to operate well in 1-Mb-flash EEPROM. This technology permits accurate control of erasure and guarantees the performance after erasure of the true single-transistor-per-cell type of flash EEPROM. Device implementation is described
In this paper, we examine a design method of modified PID (Proportional-IntegralDerivative) controllers for multiple-input/multiple-output plants. PID controller structure is the most widely used one in industrial applications. Recently the parametrization of all stabilizing PID controller has been considered. Yamada and Hagiwara proposed a design method of(More)