Virtual sensors for active noise control in acoustic-structural coupled enclosures using structural sensing: Part II-Optimization of structural sensor placement

Dunant Halim, Li Cheng, Zhongqing Su

Research output: Journal article publicationJournal articleAcademic researchpeer-review

7 Citations (Scopus)


The work proposed an optimization approach for structural sensor placement to improve the performance of vibro-acoustic virtual sensor for active noise control applications. The vibro-acoustic virtual sensor was designed to estimate the interior sound pressure of an acoustic-structural coupled enclosure using structural sensors. A spectral-spatial performance metric was proposed, which was used to quantify the averaged structural sensor output energy of a vibro-acoustic system excited by a spatially varying point source. It was shown that (i) the overall virtual sensing error energy was contributed additively by the modal virtual sensing error and the measurement noise energy; (ii) each of the modal virtual sensing error system was contributed by both the modal observability levels for the structural sensing and the target acoustic virtual sensing; and further (iii) the strength of each modal observability level was influenced by the modal coupling and resonance frequencies of the associated uncoupled structural/cavity modes. An optimal design of structural sensor placement was proposed to achieve sufficiently high modal observability levels for certain important panel- and cavity-controlled modes. Numerical analysis on a panel-cavity system demonstrated the importance of structural sensor placement on virtual sensing and active noise control performance, particularly for cavity-controlled modes.
Original languageEnglish
Pages (from-to)1991-2004
Number of pages14
JournalJournal of the Acoustical Society of America
Issue number4
Publication statusPublished - 1 Apr 2011

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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