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Smart Structures and Systems Volume 18, Number 3, September 2016 , pages 375-387 DOI: https://doi.org/10.12989/sss.2016.18.3.375 |
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Data fusion based improved Kalman filter with unknown inputs and without collocated acceleration measurements |
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Ying Lei, Sujuan Luo and Ying Su
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| Abstract | ||
| The classical Kalman filter (KF) can provide effective state estimation for structural identification and vibration control, but it is applicable only when external inputs are measured. So far, some studies of Kalman filter with unknown inputs (KF-UI) have been proposed. However, previous KF-UI approaches based solely on acceleration measurements are inherently unstable which leads to poor tracking and fictitious drifts in the identified structural displacements and unknown inputs in the presence of measurement noises. Moreover, it is necessary to have the measurements of acceleration responses at the locations where unknown inputs applied, i.e., with collocated acceleration measurements in these approaches. In this paper, it aims to extend the classical KF approach to circumvent the above limitations for general real time estimation of structural state and unknown inputs without using collocated acceleration measurements. Based on the scheme of the classical KF, an improved Kalman filter with unknown excitations (KF-UI) and without collocated acceleration measurements is derived. Then, data fusion of acceleration and displacement or strain measurements is used to prevent the drifts in the identified structural state and unknown inputs in real time. Such algorithm is not available in the literature. Some numerical examples are used to demonstrate the effectiveness of the proposed approach. | ||
| Key Words | ||
| Kalman filter; unknown inputs; data fusion; structural identification; least-square estimation | ||
| Address | ||
| Ying Lei, Sujuan Luo and Ying Su: Department of Civil Engineering, Xiamen University, Xiamen 361005, China | ||