Damage identification of belt conveyor support structure using periodic and isolated local vibration modes

다국어 초록 (Multilingual Abstract)

Due to corrosion, a large number of belt conveyors support structure in industrial plants havedeteriorated. Severe corrosion may result in collapse of the structures. Therefore, practical and effectivestructural assessment techniques are needed. In this paper, damage identification methods based on twospecific local vibration modes, named periodic and isolated local vibration modes, are proposed. Theidentification methods utilize the facts that support structures have many identical members repeated alongthe belt conveyor and there exist some local modes within a small frequency range where vibrations of theseidentical members are much larger than those of the other members. When one of these identical members isdamaged, this member no longer vibrates in those modes. Instead, the member vibrates alone in an isolatedmode with a lower frequency. A damage identification method based on frequencies comparison of thesevibration modes and another method based on amplitude comparison of the periodic local vibration modeare explained. These methods do not require the baseline measurement records of undamaged structure. Themethods is capable of detecting multiple damages simultaneously. The applicability of the methods isexperimentally validated with a laboratory model and a real belt-conveyor support structure.

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