Smart Structures and Systems

  • 제4권5호
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  • Pages.629-640
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  • 2008
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  • 1738-1584(pISSN)
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  • 1738-1991(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Determination of optimal accelerometer locations using modal sensitivity for identifying a structure

  • 투고 : 2007.05.03
  • 심사 : 2007.12.11
  • 발행 : 2008.09.25
⟨ 이전 논문 다음 논문 ⟩

초록

A new algorithm is proposed to determine optimal accelerometer locations (OAL) when a structure is identified by frequency domain system identification (SI) method. As a result, a guideline is presented for selecting OAL which can reflect modal response of a structure properly. The guideline is to provide a minimum number of necessary accelerometers with the variation in the number of measurable target modes. To determine OAL for SI applications effectively, the modal sensitivity effective independence distribution vector (MS-EIDV) is developed with the likelihood function of measurements. By maximizing the likelihood of the occurrence of the measurements relative to the predictions, Fisher Information Matrix (FIM) is derived as a function of mode shape sensitivity. This paper also proposes a statistical approach in determining the structural parameters with a presumed parameter error which reflects the epistemic paradox between the determination of OAL and the application of a SI scheme. Numerical simulations have been carried out to examine the proposed OAL algorithm. A two-span multi-girder bridge and a two-span truss bridge were used for the simulation studies. To overcome a rank deficiency frequently occurred in inverting a FIM, the singular value decomposition scheme has been applied.

키워드

참고문헌

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피인용 문헌

  1. Robustness of optimal sensor placement under parametric uncertainty vol.41, pp.1-2, 2013, https://doi.org/10.1016/j.ymssp.2013.06.022
  2. Locating the damaged storey of a building using distance measures of low-order AR models vol.6, pp.9, 2008, https://doi.org/10.12989/sss.2010.6.9.991