AAU Update

PhD defence by Bilal Ali Qadri

PhD defence by Bilal Ali Qadri

Bilal will present his thesis “Structural Damage Detection under Environmental and Operational Variability: An Exploration of two new Vibration-Based Schemes”. Due to the Covid-19 situation, the PhD defence will be carried out online.


05.03.2021 kl. 13.00 - 17.00



Due to the Covid-19 situation, the PhD defence will be carried out via Microsoft Teams. Please send an email to Linda Vabbersgaard Andersen no later than 3 March 2021 and you will get an invite for the event and, if requested, a copy of the thesis.


This thesis explores two new vibration-based damage detection schemes, which aim at improving damage detectability. Damage detectability is governed by the ratio between sensitivity to damage (high is good) and sensitivity to environmental and perational variabilities (high is bad). There are two ways to improve this ratio; one way is to mitigate the effect of such variabilities and the second way is to increase sensitivity to damage. The first method, which is a cointegration-based scheme, confronts the sensitivity issue by mitigating the effect of environmental and operational variabilities.
The scheme operates by cointegrating Mahalanobis distances of discrete Fourier coefficients.
The second scheme explores the applicability of using designed closed-loop mode shapes as features, which combine attributes from both ways by offering adequate sensitivity to damage and robustness to environmental and operational variabilities.


  • Supervisor, Prof. Anders Schmidt Kristensen, Dept. of Energy Technology, Aalborg University
  • Co-supervisor, Assist. Prof. Martin Dalgaard Ulriksen, Dept. of Energy Technology, Aalborg University


  • Assoc. Prof. Zhenyu Yang, Dept. of Energy Technology, Aalborg University (chairperson)
  • Prof. Anders Brandt, The University of Southern Denmark
  • Prof. Elizabeth J. Cross, University of Sheffield


  • Assoc. Prof. Simon Pedersen, Dept. of Energy Technology, Aalborg University


13:00: Welcome by Moderator
13:05: Lecture and presentation by Ph.D. student (45 min)
13:50: Break
During the break, participants can email questions to the moderator, Simon Pedersen spe@et.aau.dk.
If such are received, the questioner puts them forward after the assessment committee has finalized their question and answer round

14:00: The assessment committee is asking questions to the work
16:00: End of defence. The assessment committee enters another “room”, evaluates and writes the final assessment
16:30: (approx.) The assessment committee rejoins the “Defence room” and announces its decision
17:00: End of event


See program in pdf




Department of the Built Environment


Microsoft Teams

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03.03.2021 kl. 10.00

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