Design of sensor networks for instantaneous inversion of modally reduced order models in structural dynamics. (February 2015)

• Record Type: Journal Article
• Authors: Maes, K.; Lourens, E.; Van Nimmen, K.; Reynders, E.; De Roeck, G.; Lombaert, G.
• Is Part Of: Mechanical systems and signal processing. Volume 52/53(2015)
• Page Start: 628
• Page End: 644
• Publication Date: 2015-02
• Subjects: Force identification -- State estimation -- System invertibility -- Stability -- Uniqueness -- Sensor network; Structural dynamics -- Periodicals; Vibration -- Periodicals; Constructions -- Dynamique -- Périodiques; Vibration -- Périodiques; Structural dynamics; Vibration; Periodicals; 621
• DOI: 10.1016/j.ymssp.2014.07.018
• Languages: English
• ISSNs: 0888-3270

Abstract

Abstract: In structural dynamics, the forces acting on a structure are often not well known. System inversion techniques may be used to estimate these forces from the measured response of the structure. This paper first derives conditions for the invertibility of linear system models that apply to any instantaneous input estimation or joint input-state estimation algorithm. The conditions ensure the identifiability of the dynamic forces and system states, their stability and uniqueness. The present paper considers the specific case of modally reduced order models, which are generally obtained from a physical, finite element model, or from experimental data. It is shown how in this case the conditions can be directly expressed in terms of the modal properties of the structure. A distinction is made between input estimation and joint input-state estimation. Each of the conditions is illustrated by a conceptual example. The practical implementation is discussed for a case study where a sensor network for a footbridge is designed. Abstract : Highlights: Focus of the paper is on conditions for the invertibility of linear system models. Guidelines for the design of sensor networks for system inversion are presented. The implementation of the invertibility conditions is discussed for a case study.