Determinations of in-situ energy loss factors of point-connected composite plates

Seçgin, Abdullah; Güler, Serkan; Kara, Murat

doi:10.1016/j.compositesb.2015.09.019

Cited by 12 publications

(6 citation statements)

References 12 publications

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“…Studies of the application of PIM to obtain CLF have shown that Semprini and Barbaresi [23], Langhe and Sas [24], Gélat and Lalor [25], Bies and Hamid [20], and Fredö [26] used PIM to measure the vibration energy of plates from experiments in order to obtain CLF. Seçgin et al [27] used PIM to conduct SEA on composite plates (I, L, and T connection) with three di erent connection modes and discuss the numerical solutions of di erent connection modes, as well as the accuracy of PIM. e theoretical assumption of this method is that, in a certain frequency band, the subsystem modes are su ciently dense, the mode frequencies are uniformly distributed, and the measurement points can accurately re ect the time and space average characteristics.…”

Section: Expression Of Coupling Loss Factor (Clf)mentioning

confidence: 99%

Research Progress on High‐Intermediate Frequency Extension Methods of SEA

Zheng

Deng

et al. 2019

Shock and Vibration

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Statistical energy analysis (SEA) can accurately describe the average vibration characteristics through system energy flow and transmission feedback. It is a powerful tool to solve the problem of high-frequency acoustics-vibration. SEA is widely used in vehicles, ships, aviation, and other transportation engineering fields. However, the expansion of SEA, based on the assumption of modal equipartition and weak coupling, is limited to the intermediate frequency. Although the SEA basic theory can be extended by relaxing the hypothesis conditions or the analysis of the medium-frequency acoustics-vibration can be carried out using the finite element method (FEM) and SEA mixing method, there are still many challenges associated with these options. To improve the basic theory of SEA and knowledge of intermediate frequency extension methods, as well as attract the attention of domestic scholars, this paper describes classical SEA and intermediate frequency extension methods. First, coupling loss factor (CLF) error propagation and parameter acquisition in classical SEA are introduced, and the three relative error calculation methods of CLF are compared. Then, the method of obtaining parameters is described from three aspects of energy transfer, input load, and modal density. Second, SEA intermediate frequency extension technology (experimental statistical energy analysis (ESEA), finite element statistical energy analysis (FE-SEA), statistical modal energy distribution analysis (SMEDA), and waveguide analysis (WGA)) are introduced. Neutron structure assembly and modeling, interval and mixed interval analysis, interval variable and mixed interval variable response are also described, so as to justify the development of a hybrid, large-scale interval algorithm. Finally, the engineering application of the above method is introduced, the limitations and shortcomings of SEA and intermediate frequency extension methods are reviewed, and unsolved problems are further discussed.

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Section: Expression Of Coupling Loss Factor (Clf)mentioning

confidence: 99%

Research Progress on High‐Intermediate Frequency Extension Methods of SEA

Zheng

Deng

et al. 2019

Shock and Vibration

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“…Here, hi shows mean over incidence angle. Combining equation 7with equations (10) and (8) with equation (11), one can evaluate CLF as…”

Section: Statistical Energy Analysismentioning

confidence: 99%

“…For more complex structures, CLFs and DLFs can be determined by numerical/experimental power injection method. 9,10 Seçgin 11 has developed a modal-based approach for the determination of CLFs for point connected composite plates.…”

Section: Introductionmentioning

confidence: 99%

A modal impedance-based statistical energy analysis for vibro-acoustic analysis of complex systems having structural uncertainty

Seçgin

Kara

Ozankan

2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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A modal impedance-based statistical energy analysis for point, line, and area connected complex structural-acoustic systems is introduced. The proposed methodology is applied to perform mid- and high-frequency vibro-acoustic analysis of a cabinet model. The cabinet is composed of several composite plates with local mass variability simulating structural uncertainty, isotropic beams, and an acoustic enclosure. The method uses point mobilities, which are determined using modal parameters obtained by finite element method, to define line and area mobilities via dimension reducing principle. The methodology presented here is successfully verified by several numerical and experimental Monte Carlo computations. With this study, conventional statistical energy analysis is improved for mid-frequency vibro-acoustic analysis of complex systems.

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“…Seçgin [8] estimated the Statistical Energy Analysis (SEA) parameters of point connected, directly coupled, symmetrically laminated composite plates via a modal-based methodology and employed PIM to calculate the CLFs between the plates. In another work, Seçgin et al [9] determined the loss factors of different types of connections between composite plates, such as point-connected, right-angle and T shape connections. They obtained the in-situ energy loss by using numerical and experimental PIM.…”

Section: Introductionmentioning

confidence: 99%

Damping determination by the half power bandwidth method for a rectangular flat plate with bitumen damping layer application

Treszkai¹,

Vehovszky²,

Feszty³

2021

J. vibroeng.

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Damping Loss Factor (DLF) is an important input parameter in Statistical Energy Analysis (SEA) simulations, therefore its accurate determination via measurement is crucial from simulation accuracy point of view. This paper presents a methodology for the accurate measurement of DLF via the Half Power Bandwidth Method (HPBM) for three test cases: a) a rectangular steel plate, b) the same plate with viscoelastic bitumen sheets imposed on the middle of plate and c) the same plate with the viscoelastic bitumen sheets placed randomly. The aim of the different bitumen layer applications was to develop a methodology for representing them in Statistical Energy Analysis, since this simulation technique takes into account only the coverage of the damping layers but not their distribution over a panel. Measurement of the DLF in random locations on the plate gave the appropriate parameters for the simulation. Measurement results were then applied in SEA simulations, which showed good agreement with the experimental results in all test cases, with the maximum difference of only 2 dB.

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Determinations of in-situ energy loss factors of point-connected composite plates

Cited by 12 publications

References 12 publications

Research Progress on High‐Intermediate Frequency Extension Methods of SEA

Research Progress on High‐Intermediate Frequency Extension Methods of SEA

A modal impedance-based statistical energy analysis for vibro-acoustic analysis of complex systems having structural uncertainty

Damping determination by the half power bandwidth method for a rectangular flat plate with bitumen damping layer application

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