Extraction of Modal Parameters from Structural Acoustical Responses

Xian Rong Qin; Yu Nie; Jian Jun Hu; Qing Zhang; Yuan Tao Sun

doi:10.4028/www.scientific.net/AMM.459.159

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 459Extraction of Modal Parameters from Structural...

Extraction of Modal Parameters from Structural Acoustical Responses

Abstract:

A method to identify modal parameters from structural acoustical signals was proposed by a combination of empirical model decomposition (EMD) and stochastic subspace identification (SSI). Firstly, several intrinsic mode functions (IMF) were obtained with EMD, then the data obtained from the EMD was used as the input of the SSI to identify the modal parameters. Taking a wheel loader as an example, the acoustical signals in the loader cab were recorded through field tests, and were employed to identify the fundamental modal frequencies. The resultant frequencies show reasonable consistency with those by finite element analysis, and therefore prove the feasibility of the proposed method, which means that acoustical signals could be utilized as a useful supplement of the structural vibration responses in the modal parameter identification.

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Periodical:

Applied Mechanics and Materials (Volume 459)

Pages:

159-163

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.459.159

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Online since:

October 2013

Authors:

Xian Rong Qin*, Yu Nie, Jian Jun Hu, Qing Zhang, Yuan Tao Sun

Keywords:

Acoustical Signal, Empirical Mode Decomposition (EMD), Loader, Modal Parameters Identification, Stochastic Subspace Identification (SSI)

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