Semi-active control for isolated structure based on response evaluator of system respected to the source region and ground motion of earthquake

Akira Fukukita, Masaki Takahashi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This paper presents a response evaluator which evaluates the response of the system and decides the control input to the system. The characteristics of the response evaluator is designed with the source region and ground motion of earthquake. It is applied to a base isolated structure with a semi-active oil damper whose damping coefficient has large or small values. The response evaluator is designed by the multi-layered neural network which consists of the building responses and the peak ground velocity as input data and switching signal for damping coefficient as output data. Some earthquake records are divided into 8 regions by the epicenter, and the representative record of each region is normalized to 3 levels of its peak velocity which is 25, 50 and 75 cm/s. The 8 response evaluators are designed for each earthquake region and the computer simulations are carried out. Absolute acceleration and relative displacement of each story are reduced when the response evaluator corresponding to the designed region is used, but the control performance is not so good used by the most of response evaluators designed at the other region. When the response evaluator is selected corresponding to the designed region and the appropriate criterion function is set, good control effect is obtained to the wide range of amplitude of earthquake.

Original languageEnglish
Pages (from-to)2917-2925
Number of pages9
JournalNihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C
Volume75
Issue number759
Publication statusPublished - 2009 Nov
Externally publishedYes

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Earthquakes
Damping
Neural networks
Computer simulation

Keywords

  • Earthquake early warning
  • Genetic algorithm
  • Neural network
  • Response evaluation
  • Seismic isolation
  • Semi-active control
  • Variable damper

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Industrial and Manufacturing Engineering

Cite this

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AB - This paper presents a response evaluator which evaluates the response of the system and decides the control input to the system. The characteristics of the response evaluator is designed with the source region and ground motion of earthquake. It is applied to a base isolated structure with a semi-active oil damper whose damping coefficient has large or small values. The response evaluator is designed by the multi-layered neural network which consists of the building responses and the peak ground velocity as input data and switching signal for damping coefficient as output data. Some earthquake records are divided into 8 regions by the epicenter, and the representative record of each region is normalized to 3 levels of its peak velocity which is 25, 50 and 75 cm/s. The 8 response evaluators are designed for each earthquake region and the computer simulations are carried out. Absolute acceleration and relative displacement of each story are reduced when the response evaluator corresponding to the designed region is used, but the control performance is not so good used by the most of response evaluators designed at the other region. When the response evaluator is selected corresponding to the designed region and the appropriate criterion function is set, good control effect is obtained to the wide range of amplitude of earthquake.

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