Transmission of Vibration and Pressure Fluctuations Through Hydraulic Hoses

Longmore, D K; Schlesinger, Abigail

doi:10.1243/pime_proc_1991_205_319_02

Cited by 13 publications

(6 citation statements)

References 1 publication

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“…Finally, it may be noted that this paper has been concerned primarily with vibration isolation of hoses. For applications dealing primarily with sound waves along hoses or hose mufflers like power-steering systems, 3,4,8,9 the theory developed in Ref. 5 with that of Ref.…”

Section: Typical Results and Conclusionmentioning

confidence: 99%

Prediction of the vibro-acoustic transmission loss of planar hose-pipe systems

Munjal

Thawani

1997

The Journal of the Acoustical Society of America

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Vibro-acoustic energy travels through hose walls as longitudinal waves and flexural waves, apart from the sound waves through the fluid medium inside. Longitudinal waves in the hose wall are coupled to the sound waves inside by means of the hose-wall Poisson's ratio. Both in turn get coupled to bending or flexural waves because of the energy transfer or interaction at the bends. For any of these three types of waves incident on one end of a hose, waves of all the three types may be transmitted on the other end because of their dynamical coupling with one another. Therefore, in the present paper, expressions have been derived for the 3ϫ3 transmission loss matrix for a two-dimensional or planar piping system in terms of elements of the overall 8ϫ8 transfer matrix of the system. These expressions have then been used in a comprehensive computer program to evaluate the vibro-acoustic performance of hoses, with particular application to the automotive climate control systems with gaseous as well as liquid media. Finally, parametric studies have been made that have led to some general design guidelines.

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Section: Typical Results and Conclusionmentioning

confidence: 99%

Prediction of the vibro-acoustic transmission loss of planar hose-pipe systems

Munjal

Thawani

1997

The Journal of the Acoustical Society of America

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“…Various models have been developed, some relatively simple [68] and others of greater sophistication [69,70,71,72 for example]. Although very good progress has been made, some of the parametric data required can only be established experimentally [73].…”

Section: Prediction Of Fbn In Circuitsmentioning

confidence: 99%

Designing Quieter Hydraulic Systemssome Recent Developments and Contributions

Edge

1999

Proceedings of the JFPS International Symposium on Fluid Power

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This paper reviews the considerable progress that has been made over the last 25 years in the understanding of noise in hydraulic systems.Sources of fluid borne noise, structure borne noise and the resultant airborne are discussed in detail and methods of measuring, analysing and predicting behaviour are presented. This leads on to a discussion of component and system design issues. The paper concludes by identifying areas where further work is required.

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“…respectively. By substituting equations (16)-(24) into equations (10) and (11), an analytical model relating the fl uidborne pressure and flow ripples at the hose upstream and downstream may be obtained in the following transfer matrix form.…”

Section: (15)mentioning

confidence: 99%

“…(3) Longitudinal resonance of the hose wall may have a significant influence on the coupling motion of the hose and the fluid; (4) For a finite-length hose, the hose end support conditions exert direct effect on longitudinal vibrations of the hose wall and subsequently wave propagation in the fluid. Some efforts have been contributed to wave propagation characteristics in viscoelastic fluid pipes [3][4][5][6][7][8][9][10][11]. But in view of the four facts mentioned above, they can not satisfy the application of actual hoses with finite length owing to infinite-length assumption and other imperfection in theory and experiment.…”

Section: Introductionmentioning

confidence: 99%

Transmission Characteristics of Fluidborne Pressure Ripples in Finite-Length Hydraulic Flexible Hoses

Kojima

1996

Proceedings of the JFPS International Symposium on Fluid Power

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The paper is concerned with the development of an analytical model for the transmission characteristics of fluidborne pressure ripples in hydraulic flexible hoses with finite length under anchored end conditions, as an extension to the previous researches for the hoses with relatively long length[1, 2]. The model is obtained in transfer matrix form relating the pressure and flow ripples at hose upstream and downstream, by considering the effect of possible longitudinal resonance of the hose in addition to the anisotropic viscoelasticity of the hose wall and the coupled vibration of the hose and the fluid. It is applied to predict the transfer matrix parameters of the hoses with different lengths. By the comparison of the predicted and measured results, it is shown that the model yields fairly good results in a frequency range up to around 3kHz and even may accurately predict what existing models failed to predict, i.e., the influence of longitudinal resonance of the hose wall on the wave propagation of fluid in the hose. KEY WORDS Fluid power systems, Flexible hose, Pressure ripple, Wave propagation, Viscoelasticity NOMENCLATURE a, b,h: inside, average radii, and thickness of hose wall Br: Bessel function ratio, Br(z)=2.11(z)l[zio(z)] c: sonic velocity in fluid in rigid pipe Eo: average Young modulus of hose fittings Ex,Ee: longitudinal and circumferential components of normal Young modulus of hose wall Ex*,Ee*: longitudinal and circumferential components of complex Young modulus of hose wall P1,P2: pressure ripples at hose upstream and downstream Q1,Q2: flow ripples at hose upstream and downstream r: radial coordinate ro: inner radius of a reference pipe (=9.8 mm) s: Laplace operator U: axial displacement of hose wall Vr, Vx: radial and axial components of fluid velocity W, W': real & apparent radial displacements of hose wall

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Transmission of Vibration and Pressure Fluctuations Through Hydraulic Hoses

Cited by 13 publications

References 1 publication

Prediction of the vibro-acoustic transmission loss of planar hose-pipe systems

Prediction of the vibro-acoustic transmission loss of planar hose-pipe systems

Designing Quieter Hydraulic Systemssome Recent Developments and Contributions

Transmission Characteristics of Fluidborne Pressure Ripples in Finite-Length Hydraulic Flexible Hoses

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