TY - CONF A1 - Döhler, Michael A1 - Luciano, M. A1 - Laurent, M. A1 - Dionisio, B. T1 - Statistical based decision making for damage localization with influence lines T2 - 9th International Workshop on Structural Health Monitoring T2 - 9th International Workshop on Structural Health Monitoring CY - Stanford, CA, USA DA - 2013-09-10 PY - 2013 AN - OPUS4-29492 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Döhler, Michael A1 - Le Cam, V. A1 - Le Pen, M. A1 - Laurent, M. T1 - Embedded modal analysis algorithms on the smart wireless sensor platform PEGASE T2 - 9th International Workshop on Structural Health Monitoring T2 - 9th International Workshop on Structural Health Monitoring CY - Stanford, CA, USA DA - 2013-09-10 PY - 2013 AN - OPUS4-29493 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CHAP A1 - Döhler, Michael A1 - Hille, Falk A1 - Mevel, L. A1 - Rücker, Werner T1 - Estimation of modal parameters and their uncertainty bounds from subspace-based system identification T2 - IRIS Industrial safety and life cycle engineering - Technologies / Standards / Applications PY - 2013 SN - 978-3-200-03179-1 IS - Chapter 5 SP - 91 EP - 106 CY - Vienna, Austria AN - OPUS4-29906 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CHAP A1 - Döhler, Michael A1 - Hille, Falk ED - Wicks, A. T1 - Subspace-based damage detection on steel frame structure under changing excitation T2 - Structural health monitoring, Volume 5 - Proceedings of the 32nd IMAC, A conference and exposition on structural dynamics, 2014 N2 - Damage detection can be performed by detecting changes in the modal parameters between a reference state and the current (possibly damaged) state of a structure from measured output-only vibration data. Alternatively, a subspace-based damage detection test has been proposed and applied successfully, where changes in the modal parameters are detected, but the estimation of the modal parameters themselves is avoided. Like this, the test can run in an automated way directly on the vibration measurements. However, it was assumed that the unmeasured ambient excitation properties during measurements of the structure in the reference and possibly damaged condition stay constant, which is hardly satisfied by any application. A new version of the test has been derived recently that is robust to such changes in the ambient excitation. In this paper, the robust test is recalled and its performance is evaluated both on numerical simulations and a real application, where a steel frame structure is artificially damaged in the lab. KW - Damage detection KW - Ambient vibration KW - Changing excitation KW - Subspace methods KW - Robust tests PY - 2014 SN - 978-3-319-04569-6 SN - 978-3-319-04570-2 DO - https://doi.org/10.1007/978-3-319-04570-2_19 SN - 2191-5644 SN - 2191-5652 N1 - Serientitel: Conference Proceedings of the Society for Experimental Mechanics Series – Series title: Conference Proceedings of the Society for Experimental Mechanics Series VL - 5 SP - Chapter 19, 167 EP - 174 PB - Springer AN - OPUS4-31220 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Döhler, Michael A1 - Hille, Falk T1 - Subspace-based damage detection on steel frame structure under changing excitation T2 - 32nd IMAC, A Conference and Exposition on Structural Dynamics, 2014 T2 - 32nd IMAC, A Conference and Exposition on Structural Dynamics, 2014 CY - Orlando, FL, USA DA - 2014-02-03 PY - 2014 AN - OPUS4-31234 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Döhler, Michael A1 - Mevel, L. A1 - Hille, Falk T1 - Efficient computation of minmax tests for fault isolation and their application to structural damage localization T2 - 19th World congress of the international federation of automatic control (Proceedings) N2 - Fault detection and isolation can be handled by many different approaches. This paper builds upon a hypothesis test that checks whether the mean of a Gaussian random vector has become non-zero in the faulty state, based on a chi2 test. For fault isolation, it has to be decided which components in the parameter set of the Gaussian vector have changed, which is done by variants of the chi2 hypothesis test using the so-called sensitivity and minmax approaches. While only the sensitivity of the tested parameter component is taken into account in the sensitivity approach, the sensitivities of all parameters are used in the minmax approach, leading to better statistical properties at the expense of an increased computational burden. The computation of the respective test variable in the minmax test is cumbersome and may be ill-conditioned especially for large parameter sets, asking hence for a careful numerical evaluation. Furthermore, the fault isolation procedure requires the repetitive calculation of the test variable for each of the parameter components that are tested for a change, which may be a significant computational burden. In this paper, dealing with the minmax problem, we propose a new efficient computation for the test variables, which is based on a simultaneous QR decomposition for all parameters. Based on this scheme, we propose an efficient test computation for a large parameter set, leading to a decrease in the numerical complexity by one order of magnitude in the total number of parameters. Finally, we show how the minmax test is useful for structural damage localization, where an asymptotically Gaussian residual vector is computed from output-only vibration data of a mechanical or a civil structure. T2 - 19th World congress of the international federation of automatic control CY - Cape Town, South Africa DA - 24.08.2014 KW - Fault isolation KW - Residual evaluation KW - Statistical tests KW - Numerical computation KW - Mechanical systems PY - 2014 SP - 7382 EP - 7387 PB - IFAC AN - OPUS4-31573 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -