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Optimization of PID Controller Using Transient Responses
Yoshihiro Matsui 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
PID controllers are used in many industrial plants. In order to reduce the installation cost of the controllers, simple methods to optimize PID gain are desired. This paper proposes a method to optimize the PID gain. Only a set of the step command response data is used to optimize the PID gain without iterative experiments by the method. The usefulness of the method is confirmed by simulation.
Drift displacement data based estimation of cumulative plastic deformation ratios for buildings
Nishitani, Akira,Matsui, Chisa,Hara, Yushiro,Xiang, Ping,Nitta, Yoshihiro,Hatada, Tomohiko,Katamura, Ryota,Matsuya, Iwao,Tanii, Takashi Techno-Press 2015 Smart Structures and Systems, An International Jou Vol.15 No.3
The authors' research group has developed a noncontact type of sensors which directly measure the inter-story drift displacements of a building during a seismic event. Soon after that event, such seismically-induced drift displacement data would provide structural engineers with useful information to judge how the stories have been damaged. This paper presents a scheme of estimating the story cumulative plastic deformation ratios based on such measured drift displacement information toward the building safety monitoring. The presented scheme requires the data of story drift displacements and the ground motion acceleration. The involved calculations are rather simple without any detailed information on structural elements required: the story hysteresis loops are first estimated and then the cumulative plastic deformation ratio of each story is evaluated from the estimated hysteresis. The effectiveness of the scheme is demonstrated by utilizing the data of full-scale building model experiment performed at E-defense and conducting numerical simulations.
Disturbance Attenuation Fictitious Reference Iterative Tuning Using Frequency Domain Approach
Shiro Masuda,Yuki Gohda,Yoshihiro Matsui 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
The paper gives a design method for a Fictitious Reference Iterative Tuning (FRIT) method for disturbance attenuation which can be designed using the frequency domain approach. The proposed method obtains the control parameters that optimize a performance index represented in the frequency domain, which evaluates how the closed loop frequency response is close to the ideal one in the presence of a given deterministic disturbance. The frequency domain performance index for the FRIT method consists of the Fourier transformation of oneshot experimental input-output data and disturbance signal. The paper shows that a band-path filter plays an important role in the Fourier transformation of the one-shot inputoutput data, and the optimal pre-filter, which well approximates the performance index to the original performance index, can be easily calculated in the frequency domain. Finally, numerical examples show that the control parameter tuning using frequency domain FRIT method with the optimal prefilter contributes to deriving a better control parameters which improve the disturbance response.
Drift displacement data based estimation of cumulative plastic deformation ratios for buildings
Akira Nishitani,Chisa Matsui,Yushiro Hara,Ping Xiang,Yoshihiro Nitta,Tomohiko Hatada,Ryota Katamura,Iwao Matsuya,Takashi Tanii 국제구조공학회 2015 Smart Structures and Systems, An International Jou Vol.15 No.3
The authors’ research group has developed a noncontact type of sensors which directly measurethe inter-story drift displacements of a building during a seismic event. Soon after that event, suchseismically-induced drift displacement data would provide structural engineers with useful information tojudge how the stories have been damaged. This paper presents a scheme of estimating the story cumulativeplastic deformation ratios based on such measured drift displacement information toward the building safetymonitoring. The presented scheme requires the data of story drift displacements and the ground motionacceleration. The involved calculations are rather simple without any detailed information on structuralelements required: the story hysteresis loops are first estimated and then the cumulative plastic deformationratio of each story is evaluated from the estimated hysteresis. The effectiveness of the scheme isdemonstrated by utilizing the data of full-scale building model experiment performed at E-defense andconducting numerical simulations.