A symmetry measure for damage detection with mode shapes. (10th November 2017)

• Record Type: Journal Article
• Authors: Chen, Justin G.; Büyüköztürk, Oral
• Is Part Of: Journal of sound and vibration. Volume 408(2017)
• Page Start: 123
• Page End: 137
• Publication Date: 2017-11-10
• Subjects: Continuous symmetry measure -- Mode shape -- Symmetry -- Damage detection -- Structural health monitoring; Sound -- Periodicals; Vibration -- Periodicals; Son -- Périodiques; Vibration -- Périodiques; Sound; Vibration; Periodicals; Electronic journals; 620.205
• DOI: 10.1016/j.jsv.2017.07.022
• Languages: English
• ISSNs: 0022-460X

Abstract

Abstract: This paper introduces a feature for detecting damage or changes in structures, the continuous symmetry measure, which can quantify the amount of a particular rotational, mirror, or translational symmetry in a mode shape of a structure. Many structures in the built environment have geometries that are either symmetric or almost symmetric, however damage typically occurs in a local manner causing asymmetric changes in the structure's geometry or material properties, and alters its mode shapes. The continuous symmetry measure can quantify these changes in symmetry as a novel indicator of damage for data-based structural health monitoring approaches. This paper describes the concept as a basis for detecting changes in mode shapes and detecting structural damage. Application of the method is demonstrated in various structures with different symmetrical properties: a pipe cross-section with a finite element model and experimental study, the NASA 8-bay truss model, and the simulated IASC-ASCE structural health monitoring benchmark structure. The applicability and limitations of the feature in applying it to structures of varying geometries is discussed.