Helmhotz equation least squares based panel contribution anaysis .

摘要

Panel contribution analysis is an effective tool to find the relative contributions of vibrating panels towards the sound pressure level at a field point inside an enclosure. This research work presents a newly developed panel contribution analysis technique using Helmholtz equation least squares (HELS) based near field acoustic Holography method.;The proposed approach requires only one set of the acoustic pressures measured in the near field of a vibrating structure. Using these input data, the normal surface velocity and acoustic pressure are reconstructed, from which the normal acoustic intensity distribution is calculated. Next, the normal acoustic intensity is correlated to the acoustic pressure at any field point of interest. In this way, the relative contributions from individual panels toward acoustic radiation at any field point can be ranked and the critical panel(s) of a vibrating structure be identified. Numerical simulations and experimental validation using this approach for identifying critical panels inside an enclosure are presented to verify the proposed formulations.