Vibroacoustic Diagnostics Based
on the Experimental and Numerical
Approach
Roman Zajac , Václav Otipka , Aleš Prokop , and Kamil ˇ
Rehák
Abstract During the last decade, many developers in the engineering industry are
focusing on diagnostics and effective eliminating of the vibration and noise. The
vibration and acoustic emissions are directly related to each other. Based on this
fact, it is important to take into consideration the original vibration sources (engine,
gearbox), but also the radiated noise to the environment. Current time brings unprecedented possibilities in the field of laboratory measurements and computational simulations in terms of hardware and software. In the issue of vibroacoustic diagnostics,
the combination of these two approaches is very often required. In the first phase, the
modal properties of the structure are usually examined, and the material properties are
defined according to the mutual validation from both approaches. Subsequently, the
amplitudes in structural (normal acceleration of the surface) and acoustic domain
(sound power level—SWL, sound pressure level—SPL) are monitored during the
operating conditions. In laboratory conditions, the structure is often excited by a
mode exciter. In this case, the maximum amplitudes at the specific locations are
primarily recorded on the structure. This article systematically describes the vibroacoustic diagnostics of the rectangular plate. Two approaches are explained in the
paper: experimental and computational—based on the finite element method (FEM).
In the text below, the individual procedures of the two methodologies are described.
The obtained results from modal and harmonic response analyses are validated and
compared with each other.
R. Zajac (B) · V. Otipka · A. Prokop · K. ˇ
Rehák
Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, 61669
Brno, Czech Republic
e-mail: Roman.Zajac@vutbr.cz
© Springer Nature Switzerland AG 2021
N. Herisanu and V. Marinca (eds.), Acoustics and Vibration of Mechanical
Structures—AVMS 2019, Springer Proceedings in Physics 251,
https://doi.org/10.1007/978-3-030-54136-1_42
415
on the Experimental and Numerical
Approach
Roman Zajac , Václav Otipka , Aleš Prokop , and Kamil ˇ
Rehák
Abstract During the last decade, many developers in the engineering industry are
focusing on diagnostics and effective eliminating of the vibration and noise. The
vibration and acoustic emissions are directly related to each other. Based on this
fact, it is important to take into consideration the original vibration sources (engine,
gearbox), but also the radiated noise to the environment. Current time brings unprecedented possibilities in the field of laboratory measurements and computational simulations in terms of hardware and software. In the issue of vibroacoustic diagnostics,
the combination of these two approaches is very often required. In the first phase, the
modal properties of the structure are usually examined, and the material properties are
defined according to the mutual validation from both approaches. Subsequently, the
amplitudes in structural (normal acceleration of the surface) and acoustic domain
(sound power level—SWL, sound pressure level—SPL) are monitored during the
operating conditions. In laboratory conditions, the structure is often excited by a
mode exciter. In this case, the maximum amplitudes at the specific locations are
primarily recorded on the structure. This article systematically describes the vibroacoustic diagnostics of the rectangular plate. Two approaches are explained in the
paper: experimental and computational—based on the finite element method (FEM).
In the text below, the individual procedures of the two methodologies are described.
The obtained results from modal and harmonic response analyses are validated and
compared with each other.
R. Zajac (B) · V. Otipka · A. Prokop · K. ˇ
Rehák
Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, 61669
Brno, Czech Republic
e-mail: Roman.Zajac@vutbr.cz
© Springer Nature Switzerland AG 2021
N. Herisanu and V. Marinca (eds.), Acoustics and Vibration of Mechanical
Structures—AVMS 2019, Springer Proceedings in Physics 251,
https://doi.org/10.1007/978-3-030-54136-1_42
415