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Research Papers

Measured Dynamic Properties of Flexible Hoses

[+] Author and Article Information
D. Nigel Johnston1

Department of Mechanical Engineering, University of Bath, Bath BA2 7AY, UKensdnj@bath.ac.uk

Tim M. Way

 Avenca Ltd., Wiltshire SP5 3PJ, UK

Kerry M. Cone

 John Deere Worldwide Construction and Forestry Division, Dubuque, IA 52001

1

Corresponding author.

J. Vib. Acoust 132(2), 021011 (Mar 18, 2010) (8 pages) doi:10.1115/1.4000774 History: Received December 23, 2008; Revised August 12, 2009; Published March 18, 2010; Online March 18, 2010

A method for measuring the impedance matrix and the dynamic properties of a liquid-filled flexible hose is described in this paper. Dynamic hose properties are presented for a wide range of hose types. Nylon-reinforced hoses are shown to have considerably lower bulk moduli and stiffnesses than steel-reinforced hoses. The dynamic bulk moduli and stiffnesses are shown to be significantly and consistently higher than the static values. These results may be used to give an estimate of representative properties for a hose, based on its maximum pressure rating and its type of reinforcement.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Test rig for measuring hose impedance matrices

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Figure 2

Measured and modeled impedance matrix terms, hose L: (a) z1,1 and z2,2; (b) z1,2 and z2,1

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Figure 3

Test rig for static bulk modulus and axial stiffness measurements

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Figure 4

Hose volumetric strain against pressure

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Figure 5

Average bulk modulus BH for each hose

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Figure 6

Average axial stiffness Ex for each hose

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Figure 7

Average Poisson’s ratio νx for each hose

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Figure 8

Bulk modulus variation with pressure

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Figure 9

Bulk modulus variation with temperature (see Fig. 8 for legend)

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Figure 10

Axial stiffness variation with pressure

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Figure 11

Axial stiffness variation with temperature (see Fig. 1 for legend)

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Figure 12

Poisson’s ratio variation with pressure

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Figure 13

Ratio of dynamic to static bulk modulus

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Figure 14

Ratio of dynamic to static axial stiffness

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Figure 15

Comparison of hose models (hose L)

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