Response covariance-based sensor placement for structural damage detection. Issue 9 (2nd September 2018)

• Record Type: Journal Article
• Authors: Lin, Jian-Fu; Xu, You-Lin
• Is Part Of: Structure and infrastructure engineering. Volume 14:Issue 9(2018)
• Page Start: 1207
• Page End: 1220
• Publication Date: 2018-09-02
• Subjects: Sensor placement -- response covariance -- unit impulse response -- sensitivity analysis -- response independence -- damage detection; Structural analysis (Engineering) -- Periodicals; Structural engineering -- Periodicals; Buildings -- Performance -- Periodicals; 620.005
• DOI: 10.1080/15732479.2017.1402067
• Languages: English
• ISSNs: 1573-2479

Abstract

Abstract: One important function of a structural health monitoring system is to detect structural damage in a structure. However, this is a very challenging task since the measurement is often incomplete in a civil structure due to a limited number of sensors. This paper presents a response covariance-based sensor placement method for structural damage detection with two objective functions for optimisation. The relationship between the covariance of acceleration responses and the covariance of unit impulse responses of a structure subjected to multiple white noise excitations is first derived. The response covariance-based damage detection method is then presented. Two objective functions based on the response covariance sensitivity and the response independence are, respectively, formulated and finally integrated into a single objective function for optimal sensor placement. Numerical studies are conducted to investigate the feasibility and effectiveness of the proposed method via a three-dimensional frame structure. Numerical results show that the proposed method with the backward sequential sensor placement algorithm is effective for damage detection.