Estimation of Radiated Sound Power: A Case Study on Common Approximation Methods

Fritze, Denny; Marburg, Steffen; Hardtke, H.‐J.

doi:10.3813/aaa.918214

Cited by 65 publications

(26 citation statements)

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“…However it gives a qualitatively good approximation for structure-induced acoustical fields. 29 In linear vibro-acoustics, typically the coupling relation between structure and fluid is governed by the equality of the normal velocity of structural surface vs and the particle velocity of the fluid vf on the structural surface: 28 (16) Combining Eq. (15) and Eq.…”

Section: Minimum Equivalent Radiated Powermentioning

confidence: 99%

Multi-Objective Optimization of Stiffened, Fiber-Reinforced Composite Fuselages for Mechanical and Vibro-Acoustic Requirements

Serhat

Faria

Basdogan

2016

17th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference

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In this paper, a preliminary design methodology for optimization of stiffened, fiberreinforced composite fuselages for combined mechanical and vibro-acoustic requirements is presented. Laminate stiffness distributions are represented using the method called lamination parameters which is known to provide a convex solution space. Single-objective and multi-objective optimization studies are carried out in order to find optimal stiffness distributions. Performance metrics for acoustical behavior are chosen as maximum fundamental frequency and minimum equivalent radiated power. The mechanical performance metric is chosen as the maximum stiffness. The results show that the presented methodology works effectively and it can be used to improve load-carrying and acoustical performances simultaneously.

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Section: Minimum Equivalent Radiated Powermentioning

confidence: 99%

Multi-Objective Optimization of Stiffened, Fiber-Reinforced Composite Fuselages for Mechanical and Vibro-Acoustic Requirements

Serhat

Faria

Basdogan

2016

17th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference

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“…Finally, the structural vibration, i.e. the normal surface velocity is used to evaluate the Equivalent Radiated Power (ERP) (29) .…”

Section: Research Paper 20184106mentioning

confidence: 99%

Model Reduction Technique for Analysing Friction-Induced Vibrations and Radiated Sound

Weisheit

Marburg

2018

IJAE

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A novel approach for the calculation of friction induced vibration is presented and applied to a real life example. The balance equations of continuum mechanics representing the underlying physics are simplified and then solved numerically. First, a linearised model of the example system is built to extract modal parameters such as eigenvalues and eigenvectors. A subset of eigenvectors is then used to calculate the system's response due to friction related excitation. This non-linear vibration is calculated by utilising an explicit time integration scheme. With the use of a subset of eigenvectors the degree of freedom of the system is reduced drastically, leading to considerable reduction of computational effort. The solution is compared to results from adequate experiments. Although developed in a context of noise calculation in the automotive sector, this work focuses on the calculation of friction induced vibration, rather than on noise prediction. Nevertheless, as an example the resulting noise of the vibrating system is estimated by means of the Equivalent Radiated Power (ERP).

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“…Since acoustic power is determined by the surface velocity, one alternative and less computationally expensive objective function is to consider only vibrational efficiency of the structure as expressed by the mean square normal velocity [19]. This is also known as the equivalent radiated sound power [20].…”

Section: Optimization Proceduresmentioning

confidence: 99%

Fast Vibroacoustic Optimization of Mechanical Structures Using Artificial Neural Networks

Ranjbar¹,

Marburg²

2013

IJMEA

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An artificial neural network (ANN) is adjusted to make analytical approximation of objective function for a specific structural acoustic application. It is used as the replacement of the main real objective function during the optimization process. The goal of optimization is to find the best geometry modification of the considered model which is supposed to produce lower values of the radiated sound power levels. The result of this study shows that the function approximation by neural networks can reduce the duration of optimization procedure. Furthermore, the tuning of ANN internal parameter settings is a real challenge to be considered.

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Estimation of Radiated Sound Power: A Case Study on Common Approximation Methods

Cited by 65 publications

References 0 publications

Multi-Objective Optimization of Stiffened, Fiber-Reinforced Composite Fuselages for Mechanical and Vibro-Acoustic Requirements

Multi-Objective Optimization of Stiffened, Fiber-Reinforced Composite Fuselages for Mechanical and Vibro-Acoustic Requirements

Model Reduction Technique for Analysing Friction-Induced Vibrations and Radiated Sound

Fast Vibroacoustic Optimization of Mechanical Structures Using Artificial Neural Networks

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