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1
Content available Study on the Effectiveness of Monte Carlo Filtering when Correcting Negative SEA Loss Factors
Nieradka Paweł, Dobrucki Andrzej
Archives of Acoustics
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2023
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Vol. 48, No. 2
201--218
EN
The power injection method (PIM) is an experimental method used to identify the statistical energy analysis (SEA) parameters (called loss factors – LFs) of a vibroacoustic system. By definition, LFs are positive real numbers. However, it is not uncommon to obtain negative LFs during experiments, which is considered a measurement error. To date, a recently proposed method, called Monte Carlo filtering (MCF), of correcting negative coupling loss factors (CLFs) has been validated for systems that meet SEA assumptions. In this article, MCF was validated for point connections and in conditions where SEA assumptions are not met (systems with low modal overlap, non-conservative junctions, strong coupling). The effect of removing MCF bias on the results was also examined. During the experiments, it was observed that the bias is inversely proportional to the damping loss factor of the examined subsystems. The obtained results confirm that the PIM, combined with MCF, allows to determine non-negative SEA parameters in all considered cases.
2
Content available Study of Noise Propagation for Small Vessels
Weryk M., Kozaczka E., Grelowska G.
Archives of Acoustics
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2015
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Vol. 40, No. 2
267--272
EN
The paper presents the results of the noise propagation analysis in ship structures tested in a number of AHTS (Anchor Handling Tug Supply) vessels. Statistical Energy Analysis (SEA) based on numerical model developed specially for the purpose of this numerical investigation were conducted. This numerical model enabled the analysis of both the structural elements and the acoustic spaces. For the detailed studies 47 points fixed at various ship locations were selected. Prediction results with use of the numerical model were compared with the experimental results carried out in six identical AHTS vessels. Experimental studies were performed in accordance with the requirements of the International Maritime Organization (IMO) Resolution A.468 (XII). As a result one presented a comparison of the model analysis and experimental tests results.
3
Content available The method of application of SEA in structural design process for reducing structure-borne noise in machinery. Part 2, Structural optimization of subsystems
Kuroda K., Kuratani F., Yamazaki T.
Mechanics / AGH University of Science and Technology
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2009
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Vol. 28, no. 3
76-82
EN
This paper presents the formulation of the structural optimization method on the basis of statistical energy analysis. A4 laser beam printer consisting of eight finite elastic steel plates is considered as an example, where the mass is taken as a constraint function. Consequently, taking one CLF as the objective function, an optimization of the thickness of the shell elements is performed showing the efficiency of the structural optimization method.
PL
W pracy zaprezentowano sformułowanie metody optymalizacji struktury bazującej na analizie statystycznego rozkładu energii. Jako przykład obiektu wybrano drukarkę laserową, której elementami jest osiem stalowych płyt. W przyjętej metodzie optymalizacji masy płyt pełnią rolę ograniczeń. Przyjmując CLF jako funkcję celu, przeprowadzono optymalizację grubości elementów powłokowych, pokazując efektywność metod optymalizacji strukturalnej.
4
Content available The method of application of SEA in structural design process for reducing structure-borne noise in machinery. Part 1, General procedure
Yamazaki T., Kuroda K.
Mechanics / AGH University of Science and Technology
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2009
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Vol. 28, no. 3
69-75
EN
The paper focuses on the finding which parts of machinery should be modified in order to reduce the noise. The countermeasure is decided by being based on the theoretical formulation the statistical energy analysis (SEA). The proposed process is applied to determine the countermeasures to structure-borne noise in a commercial product (A4 laser printer). This study is the first report of a series to develop a process based on the SEA.
PL
Artykuł poświęcono metodzie wyszukiwania podukładów maszyn, które powinny być zmodyfikowane w celu obniżenia poziomu hałasu. Metoda bazuje na statystycznej analizie przepływu energii (SEA). Zaproponowaną metodę zastosowano do obniżenia hałasu wytwarzanego przez drukarkę laserową. Artykuł jest pierwszą częścią raportu poświęconego omawianej metodzie.
5
Acoustic Radiation by Set of L-Jointed Vibrating Plates
Kozień M., Wiciak J.
Molecular and Quantum Acoustics
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2005
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Vol. 26
183-190
EN
Sound radiation from a L-jointed plates is investigated. Of particular interest is the acoustic pressure level at the control point at the distance of 1 m from the two plate surfaces. Two approaches were utilised, the FEM method was applied in the analysis of structural vibrations and the radiation efficiency in the analysis of acoustic phenomena. The other approach was the statistical energy analysis, referred to as SEA.
6
Content available remote Experimental assessment of coupling loss factors of thin rectangular plates
Panuszka R., Wiciak J., Iwaniec M.
Archives of Acoustics
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2005
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Vol. 30, No. 4
533-551
EN
Knowledge of Coupling Loss Factors (CLF's) for energy flow evaluation in structural elements of complex mechanical systems is fundamental. Several experiments were conducted to evaluate CLFs of different perpendicular connections of rectangular plates. The method of energy storage was conducted under acoustic free-field conditions, and a large number of thin plates with different designs of junctions were examined. The tests included two types of connections: welded line junction and point junctions. In the first type of connection, the influence of the thickness ratio of plates on CLFs values was tested. In the second type of connection the influence of the point of distribution at junctions on CLFs values were tested. Other tests were done to establish the impact of junction design on CLFs. Welded line junctions have a tendency to decrease the CLFs when the ratio of thickness of plates is increased. The CLFs also increase with density of joining points. Maximal values of CLFs were observed for spot-welded junctions. Mid-values were represented by screw-bolted joints and the lowest values by riveted junctions.
7
Acoustics Radiation of a Plate with Line and Cross Type Piezoelectric Elements
Kozień M., Wiciak J.
Molecular and Quantum Acoustics
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2003
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Vol. 24
97-108
EN
The analysis of acoustics radiation generated by excited steady-state vibration of a plate is presented in the paper. The structural vibration analysis of a plate with system of piezoelectric layers was made by application of the finite element package ANSYSâ. The analysis was done for the lowest three modes. The hybrid method and fluid structure interactive were applied to estimate of the sound pressure radiated by vibrating panel.
8
Acoustical Modelling of the Double Aluminium Plate System by the Use of the Sea Method
Iwaniec M., Wiciak J.
Molecular and Quantum Acoustics
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2003
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Vol. 24
69-80
EN
The analysis aimed at determining the appropriate acoustic model of the wall partition which consists of two thin plates separated by a thin spatial interior acoustic cavity. The partition separates two adjacent 3D acoustic cavities: the transmitter and receiver rooms. In the paper two way of modeling of such a structure are presented. In the first case the interior cavity and the plates are considered as a separate subsystem while in the second case for those elements a double wall model is assumed. The result of SEA method prediction are compared to the 'in situ' measurements
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