title: Virtual sensors for active noise control in acoustic-structural coupled enclosures using structural sensing: part II--Optimization of structural sensor placement.
abstract: 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.
authors.affiliation: Department of Mechanical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong.
authors.forename: Dunant
authors.initials: D
authors.lastname: Halim
authors.forename: Li
authors.initials: L
authors.lastname: Cheng
authors.forename: Zhongqing
authors.initials: Z
authors.lastname: Su
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D000465:Algorithms; D004779:Environment Design; D006801:Humans; D008962:Models, Theoretical; D009622:Noise / Q000517:prevention & control*; D014584:User-Computer Interface; D014732:Vibration