A subsystem identification method based on the path concept with coupling strength estimation. (1st February 2018)

• Record Type: Journal Article
• Authors: Magrans, Francesc Xavier; Poblet-Puig, Jordi; Rodríguez-Ferran, Antonio
• Is Part Of: Mechanical systems and signal processing. Volume 100(2018)
• Page Start: 588
• Page End: 604
• Publication Date: 2018-02-01
• Subjects: Path -- Subsystem -- Transfer matrix -- Coupling; 00-01 -- 99-00; Structural dynamics -- Periodicals; Vibration -- Periodicals; Constructions -- Dynamique -- Périodiques; Vibration -- Périodiques; Structural dynamics; Vibration; Periodicals; 621
• DOI: 10.1016/j.ymssp.2017.07.043
• Languages: English
• ISSNs: 0888-3270

Abstract

Highlights: A methodology for the automatic identification of subsystems in a mechanical system is defined. Theoretical explanations of the proper behaviour of the method are provided. The proposed methodology is successfully applied to some examples by means of numerical simulations. An estimator of the coupling strength between subsystems is defined. Basic concepts on transfer matrices and the clustering algorithm are reviewed (including three videos). Abstract: For complex geometries, the definition of the subsystems is not a straightforward task. We present here a subsystem identification method based on the direct transfer matrix, which represents the first-order paths. The key ingredient is a cluster analysis of the rows of the powers of the transfer matrix. These powers represent high-order paths in the system and are more affected than low-order paths by damping. Once subsystems are identified, the proposed approach also provides a quantification of the degree of coupling between subsystems. This information is relevant to decide whether a subsystem may be analysed in a computer model or measured in the laboratory independently of the rest or subsystems or not. The two features (subsystem identification and quantification of the degree of coupling) are illustrated by means of numerical examples: plates coupled by means of springs and rooms connected by means of a cavity.