Lambda-Matrix based State Estimation Technique

K.-T. Yang (Korea)


state estimation, coordinate reduction, Lambda matrix, frequency responses, moving load


When applying a system identification technique, which incorporates an experimental model to a corresponding finite element model of a structure, one of the major problems is the large difference in the numbers of degrees of freedom (dof) between the two models. While there are large number of dofs in a finite element model, the number of measurement points is very limited and also it is very difficult to measure a rotational dof of a structure. In this study a method is presented for estimating dynamic responses of a structure at unmeasurable locations in frequency domain. The prediction is based on measuring responses at accessible locations and transforming them into responses at desired locations using a state estimation technique. The methods are tested numerically and the feasibility for practical applications has been demonstrated through an example structure under moving load.

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