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Damping Effects Induced by a Mass Moving along a Pendulum
Joint Authors
Gandino, E.
Bellino, A.
Fasana, A.
Garibaldi, L.
Marchesiello, S.
Source
Issue
Vol. 2014, Issue 2014 (31 Dec. 2014), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2014-06-01
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
The experimental study of damping in a time-varying inertia pendulum is presented.
The system consists of a disk travelling along an oscillating pendulum: large swinging angles are reached, so that its equation of motion is not only time-varying but also nonlinear.
Signals are acquired from a rotary sensor, but some remarks are also proposed as regards signals measured by piezoelectric or capacitive accelerometers.
Time-varying inertia due to the relative motion of the mass is associated with the Coriolis-type effects appearing in the system, which can reduce and also amplify the oscillations.
The analytical model of the pendulum is introduced and an equivalent damping ratio is estimated by applying energy considerations.
An accurate model is obtained by updating the viscous damping coefficient in accordance with the experimental data.
The system is analysed through the application of a subspace-based technique devoted to the identification of linear time-varying systems: the so-called short-time stochastic subspace identification (ST-SSI).
This is a very simple method recently adopted for estimating the instantaneous frequencies of a system.
In this paper, the ST-SSI method is demonstrated to be capable of accurately estimating damping ratios, even in the challenging cases when damping may turn to negative due to the Coriolis-type effects, thus causing amplifications of the system response.
American Psychological Association (APA)
Gandino, E.& Marchesiello, S.& Bellino, A.& Fasana, A.& Garibaldi, L.. 2014. Damping Effects Induced by a Mass Moving along a Pendulum. Shock and Vibration،Vol. 2014, no. 2014, pp.1-9.
https://search.emarefa.net/detail/BIM-1047892
Modern Language Association (MLA)
Gandino, E.…[et al.]. Damping Effects Induced by a Mass Moving along a Pendulum. Shock and Vibration No. 2014 (2014), pp.1-9.
https://search.emarefa.net/detail/BIM-1047892
American Medical Association (AMA)
Gandino, E.& Marchesiello, S.& Bellino, A.& Fasana, A.& Garibaldi, L.. Damping Effects Induced by a Mass Moving along a Pendulum. Shock and Vibration. 2014. Vol. 2014, no. 2014, pp.1-9.
https://search.emarefa.net/detail/BIM-1047892
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1047892