Structural Damage Localisation Through Shaped Inputs
Authors
Veis, Palle Høgh ; Klockmann, Lasse Bolther
Term
4. semester
Education
Publication year
2018
Submitted on
2018-06-07
Pages
76
Abstract
Dette speciale undersøger en ny vibrationsbaseret metode til at lokalisere skader i konstruktioner, kaldet Shaped Damage Locating Input Distribution (SDLID). Hovedidéen er at vælge, hvordan strukturen exciteres—hvor og hvor meget belastning der lægges på—så udvalgte stationære vibrationsstørrelser undertrykkes. Hvis den beskadigede del i praksis gøres “tavs” i de målte størrelser med sådanne formede input, bliver den langvarige vibrationsrespons den samme som for den ubeskadigede struktur. Skaden kan lokaliseres ved at sammenligne vibrationsmønstre (signaturer) fremkaldt af de samme formede input for en beskadiget og en ubeskadiget tilstand og finde, hvor responserne falder sammen. Specialet omfatter numeriske simuleringer til at validere metoden samt eksperimentelle forsøg på en seksetagers rammekonstruktion for at belyse den praktiske anvendelse.
This thesis examines a new vibration-based method for locating damage in structures, called the Shaped Damage Locating Input Distribution (SDLID). The core idea is to choose how the structure is excited—where and how much load is applied—so that selected steady-state vibration quantities are suppressed. If the damaged part is effectively made “dormant” in the measured response by such shaped inputs, the long-term vibration response becomes the same as that of the undamaged structure. By comparing the vibration patterns (signatures) produced by the same shaped inputs in a damaged and an undamaged state, the damage location can be inferred when the responses match. The study includes numerical simulations to validate the method and experimental tests on a six-story frame to discuss practical implementation.
[This abstract was generated with the help of AI]
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