Two new fast identification algorithms of time-varying modal parameters based on subspace tracking
Gongcheng Lixue/Engineering Mechanics(2012)
Abstract
The procedure of fast identification algorithms of the time-varying modal parameter based subspace tracking is investigated in this paper. After the pretreatment to the updating input/output data, the problem of fast time-varying modal parameter identification changes to be a subspace tracking problem principally. Adopting the principal subspace tracking algorithms, the fast time-varying modal parameter identification algorithms can be deduced. Replacing PAST by NPI and API, two new versions of time-varying modal parameter identification algorithms are proposed. The performance of the fast modal parameter identification algorithms based on different principal subspace tracking algorithms are compared by applying them on a classical time-varying mechanical system of a moving distributed mass-cantilever beam and a 2-DOF spring-mass model.
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Key words
Identification algorithms,Subspace method,Subspace tracking,Time-varying mechanical system,Time-varying modal parameter
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