Vibrations of three-dimensional pipe systems with acoustic coupling

El‐Raheb, Michael

doi:10.1016/s0022-460x(81)80157-5

Cited by 14 publications

(8 citation statements)

References 19 publications

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“…Apparently, the valve displacements are relatively small for the vibration of the liquid column, whereas they are relatively large for the vibration of the pipe. 5. CONCLUSIONS…”

Section: P0 S 0 46mentioning

confidence: 97%

“…El-Raheb [5] and Nanayakkara and Perreira [6] derived transfer matrices for straight and curved pipes, including the effects of junction coupling but excluding those of Poisson and friction coupling. The matrices formed the basis of a general algorithm to calculate the frequency response of, two-in reference [6] and three-in reference [5], dimensional unbranched pipe systems.…”

Section: Previous Workmentioning

confidence: 99%

“…The matrices formed the basis of a general algorithm to calculate the frequency response of, two-in reference [6] and three-in reference [5], dimensional unbranched pipe systems. Nanayakkara and Perreira compared their computational results on a single elbow pipe system with those obtained from three-dimensional ®nite element modelling and with experimental data from literature.…”

Section: Previous Workmentioning

confidence: 99%

See 2 more Smart Citations

Fsi Analysis of Liquid-Filled Pipes

Lx¹,

Tijsseling

Vardy

1999

Journal of Sound and Vibration

111

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“…Apparently, the valve displacements are relatively small for the vibration of the liquid column, whereas they are relatively large for the vibration of the pipe. 5. CONCLUSIONS…”

Section: P0 S 0 46mentioning

confidence: 97%

Section: Previous Workmentioning

confidence: 99%

Section: Previous Workmentioning

confidence: 99%

See 1 more Smart Citation

Fsi Analysis of Liquid-Filled Pipes

Lx¹,

Tijsseling

Vardy

1999

Journal of Sound and Vibration

111

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“…The linear fourteen-equation model then was extended and followed by Wiggert et al [20] and many other researchers [21][22][23][24][25][26][27][28][29][30], including Poisson coupling and using Timoshenko-type beam theory. Lesmez [21,22] studied fourteen equations for a straight pipe and the transfer matrix of a bend, and more importantly included extra mass and the spring force in his model.…”

Section: Literature Of Analytical Modelmentioning

confidence: 99%

Frequency modelling and solution of fluid–structure interaction in complex pipelines

Johnston

Zhang

et al. 2014

Journal of Sound and Vibration

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Complex pipelines may have various structural supports and boundary conditions, as well as branches. To analyse the vibrational characteristics of piping systems, frequency modelling and solution methods considering complex constraints are developed here. A fourteen-equation model and Transfer Matrix Method (TMM) are employed to describe Fluid-Structure Interaction (FSI) in liquid-filled pipes. A general solution for the multi-branch pipe is proposed in this paper, offering a methodology to predict frequency responses of the complex piping system. Some branched pipe systems are built for the purpose of validation, indicating good agreement with calculated results.

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“…Así por ejemplo, en el caso de renovación de la carga este proceso tiene lugar a través de las paredes del colector que vibran [34] debido al flujo que se desarrolla en su interior. Esta vibración puede ser particularmente importante cuando alguna frecuencia de excitación debida al flujo, o a su turbulencia, se acopla con las frecuencias características de vibración mecánica del colector [60]. Estos fenómenos pueden llegar a ser determinantes cuando el acoplamiento tiene lugar a baja frecuencia, caso en el que pueden excitarse las frecuencias mecánicas propias de la carrocería y hacer inviable la permanencia en el habitáculo [30].…”

Section: Fuentes De Ruido En El Motorunclassified

Contribución al estudio y caracterización de la generación de ruido de flujo en el sistema de escape.

Verdú¹,

Concepción²

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The studies of the vehicle noise emissions has been acquired a great relevance over the last few years for two reasons: (1) the increased social sensitivity to environmental contamination phenomena among which acoustic contamination is found, and (2) to the highest market requirements (higher "capability"vehicles at the same time as more comfortable ones: acoustic comfort).Within the complexity of the vehicle acoustic generation phenomena in this doctoral thesis, we will focus on one of the engine contributions: the exhaust noise. This component of noise is the result of two different phenomena: pulsating noise originated in the gas exchange process in the cylinders, and the flow noise induced by the turbulence phenomena developed by the mean flow that goes through the exhaust system. From these two phenomena the core of our study is flow noise and its prediction, under the motivation that as well as the pulsating noise being extensively studied and there being some prediction methods in it, the flow noise is unknown to a great extent. To this we should add, that while the pulsating noise contribution, main source, has been reduced the flow noise contribution has become more and more important in exhaust noise. The relevance of flow noise contribution is associated with its interaction with the acoustics in the system (it could amplify the main source contribution) and the existence of mufflers that work as flow noise generation sources.For the flow noise contribution study, the present doctoral thesis has been structured in six well-defined chapters.In the first chapter there is a summary of the different contributions that can be distinguished in the overall vehicle emitted noise. The importance of the flow noise study is justified from the present state of knowledge in this subject, and also the methodology bases used to perform it.In the second chapter, an experimental procedure for the estimation of the volume velocity fluctuation at the open end of the exhaust tailpipe of an internal combustion engine is presented. The different physical mechanisms involved in the emission process are analysed through the introduction of a realistic emission model. The possibility to consider that the pulsating component of the noise and the flow noise are decoupled to a certain extent is established, which means that this last component is generated by a mean "steady" flow superimposed to a pulsating flow. 8Once the possibility of studying the contribution of flow noise generated during the exhaust process as a steady flow effect has been justified. In the third chapter an experimental technique, sound intensity from in-duct measurements, is presented to analyse it. This technique allows the study of the flow noise generation by the individual component of an exhaust system (useful in the automotive industry) on a cold flow test bench. The proposed technique also allows to separate and to know the contributions in the final radiated noise of the internal and external sources of the muffler.Once the experimental pr...

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Vibrations of three-dimensional pipe systems with acoustic coupling

Cited by 14 publications

References 19 publications

Fsi Analysis of Liquid-Filled Pipes

Fsi Analysis of Liquid-Filled Pipes

Frequency modelling and solution of fluid–structure interaction in complex pipelines

Contribución al estudio y caracterización de la generación de ruido de flujo en el sistema de escape.

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