| Full text | |
| Author(s): |
Iwanaga, M. K.
;
Brennan, M. J.
;
Tang, B.
;
Scussel, O.
;
Almeida, F. C. L.
Total Authors: 5
|
| Document type: | Journal article |
| Source: | MECCANICA; v. 56, n. 1, p. 9-pg., 2021-01-04. |
| Abstract | |
Impulse response functions (IRFs) and frequency response functions (FRFs) are fundamental quantities that describe the dynamic behaviour of a linear vibrating system in the time and frequency domains respectively. The acceleration IRF is of particular concern in this paper, because unlike the displacement and velocity IRFs it contains a Delta function as well as a decaying oscillation. The origin of this Delta function is shown to be due to the causality constraint rather than the system. To illustrate the characteristics of the IRFs and FRFs, simulations are presented for a single-degree-of-freedom system, and are supported by some laboratory experimental work. The acceleration IRF is partitioned into the impulse component (Delta function for the simulations) and the oscillatory component. They are separately transformed to the frequency domain to illustrate their effects in the accelerance FRFs for both simulated and measured data. (AU) | |
| FAPESP's process: | 17/14432-0 - Analysis of sensors and different excitation mechanisms in locating and detecting leaks in buried water distribution pipes |
| Grantee: | Oscar Scussel |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 17/16953-8 - Development of a virtual PIPE test rig for testing acoustic correlators for leak detection in buried water pipes |
| Grantee: | Mauricio Kiotsune Iwanaga |
| Support Opportunities: | Scholarships in Brazil - Master |