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Abstract: A novel recursive subspace method is developed based on
fixed length moving window (FLMW) projection approximation used for
estimating the modal parameter of linear time-varying structural system.
The projection approximation subspace tracking (PAST) method with FLMW
is developed to replace a singular value decomposition in order to
decrease the computational complexity. A 3 degree-of-freedom model with
time-varying stiffness and a manipulator with moving mass are used to
testify these two methods. The simulation results show that these two
methods can avoid the influence of the old data efficiently, and the
novel recursive method can estimate the parameter of linear time-varying
system as efficiently as the recursive subspace method with FLMW, with
the computational complexity decreasing at the same time.
Key words: Projection approximation with moving window Linear
time-varying system Recursive subspace method Parameter
estimation
CLC No: TP
271+71 N 945.14
国家自然科学基金资助项目(19972017).
Received 20041120, received in revised form 20050510
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