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Modal testing

About: Modal testing is a research topic. Over the lifetime, 4047 publications have been published within this topic receiving 64772 citations.


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TL;DR: In this article, new variance computation schemes for modal parameters are developed for four subspace algorithms, including output-only and input/output methods, as well as data-driven and covariance-driven methods.

63 citations

Journal ArticleDOI
TL;DR: In this article, a flexible beam with piezoelectric pieces on the surface is investigated experimentally using the independent modal space control method, which is able to control the first three modes of the beam independently.

62 citations

Journal ArticleDOI
TL;DR: In this paper, an automated modal tracking strategy for structural health monitoring (SHM) applications in earthquake prone regions is described, based on the knowledge of the experimental mode shapes and a revised concept of spatial filtering.

62 citations

Journal ArticleDOI
TL;DR: In this paper, a finite element method is presented to analyze the free vibration of a flexible HDD (hard disk drive) composed of the spinning disk, hub and FDBs, the head-suspension-actuator with pivot bearings, and the base plate with complicated geometry.
Abstract: This paper presents a finite element method to analyze the free vibration of a flexible HDD (hard disk drive) composed of the spinning disk–spindle system with fluid dynamic bearings (FDBs), the head–suspension–actuator with pivot bearings, and the base plate with complicated geometry. Finite element equations of each component of an HDD are consistently derived with the satisfaction of the geometric compatibility in the internal boundary between each component. The spinning disk, hub and FDBs are modeled by annular sector elements, beam elements and stiffness and damping elements, respectively. It develops a 2-D quadrilateral 4-node shell element with rotational degrees of freedom to model the thin suspension efficiently as well as to satisfy the geometric compatibility between the 3-D tetrahedral element and the 2-D shell element. Base plate, arm, E-block and fantail are modeled by tetrahedral elements. Pivot bearing of an actuator and air bearing between spinning disk and head are modeled by stiffness elements. The restarted Arnoldi iteration method is applied to solve the large asymmetric eigenvalue problem to determine the natural frequencies and mode shapes of the finite element model. Experimental modal testing shows that the proposed method well predicts the vibration characteristics of an HDD. This research also shows that even the vibration motion of the spinning disk corresponding to half-speed whirl and the pure disk mode are transferred to a head–suspension–actuator and base plate through the air bearing and the pivot bearing consecutively. The proposed method can be effectively extended to investigate the forced vibration of an HDD and to design a robust HDD against shock.

62 citations

Journal ArticleDOI
TL;DR: In this paper, the authors presented work on modal identification of the structure using ambient vibration measurement using an array of tri-axial acceleration data has been obtained using a number of setups to cover all locations of interest with a limited number of sensors.

61 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202367
2022164
202141
202059
201967
201878