A study on floor micro-vibration in high technology factories

Lee Chien-Liang, Su Kai-Leung, Yen-Po Wang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

This study explores vertical floor micro-vibration induced by the automated guided vehicles (AGVs). AGVs move on multiple long-span production floors in TFT-LCD fabs, where many vibration-sensitive tools are installed. A simplified method is proposed here to assess AGVinduced floor vibration, which has rarely been taken into account in the design stage. The statespace procedure (SSP) is adopted to compute theAGV-induced floor vibration as it preserves the desired numerical stability and accuracy in high frequency responses. The dynamic analysis of a AGV moving on an equivalent three-span beam model of a TFT-LCD building is simulated by taking into account various AGV speeds and engine forces. Numerical simulations demonstrate that if proper engine forces and excitation frequency contents of theAGVmoving loads are used, the peak AGV-induced floor micro-vibration level can be predicted by the proposed method. Moreover, the effectiveness of vibration control by span-reduction as well as energy-dissipation by viscoelastic (VE) dampers is also examined. In comparison with span-reduction, application of energy dissipation devices is more effective in vibration suppression as they enhance the dampingcharacteristicsofthemulti-spanfloorsystemwhosenaturalfrequenciesarepotentiallyin resonancewiththe excitationfrequenciesof theAGVmovingloads rangingina broadbandwidth.

Original languageEnglish
Title of host publicationISEC 2011 - 6th International Structural Engineering and Construction Conference
Subtitle of host publicationModern Methods and Advances in Structural Engineering and Construction
EditorsSiamak Yazdani, Sai On Cheung, Amarjit Singh, Nader Ghafoori
PublisherResearch Publishing Services
Pages801-806
Number of pages6
ISBN (Electronic)9789810879204
DOIs
StatePublished - 1 Jan 2011
Event6th International Structural Engineering and Construction Conference: Modern Methods and Advances in Structural Engineering and Construction, ISEC 2011 - Zurich, Switzerland
Duration: 21 Jun 201126 Jun 2011

Publication series

NameISEC 2011 - 6th International Structural Engineering and Construction Conference: Modern Methods and Advances in Structural Engineering and Construction

Conference

Conference6th International Structural Engineering and Construction Conference: Modern Methods and Advances in Structural Engineering and Construction, ISEC 2011
CountrySwitzerland
CityZurich
Period21/06/1126/06/11

Keywords

  • Automated guided vehicle (AGV)
  • Damper
  • Micro-vibration
  • Moving loads
  • State space procedure
  • Vibration control

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