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Research Papers

Measurement of Effective Fluid Bulk Modulus in Hydraulic System

[+] Author and Article Information
Huayong Yang

The State Key Laboratory of Fluid Power Transmission and Control,  Zhejiang University, Hangzhou 310027, Chinayhy@zju.edu.cn

Bin Feng

The State Key Laboratory of Fluid Power Transmission and Control,  Zhejiang University, Hangzhou 310027, Chinaabbottfeng@zju.edu.cn

Guofang Gong

The State Key Laboratory of Fluid Power Transmission and Control,  Zhejiang University, Hangzhou 310027, Chinagfgong@zju.edu.cn

J. Dyn. Sys., Meas., Control 133(6), 061021 (Nov 23, 2011) (6 pages) doi:10.1115/1.4004783 History: Received January 05, 2010; Revised April 17, 2011; Published November 23, 2011

Effective fluid bulk modulus has significant influence on the stiffness and dynamic performance of hydraulic systems. It is always varied with different working parameters as air content, fluid pressure, and temperature. To estimating effective bulk modulus accurately is very important when designing high performance hydraulic systems. In this study, a measuring device was developed based on the definition of bulk modulus, and the measurement accuracy was estimated. Experiments were carried out using L-HM46 antiwear hydraulic fluid at approximately constant temperature, the results show that the good repeatability and pressure resolution can be achieved. Results also show that when pressure is low, the bulk modulus increases strongly as pressure increases; pressures over 8.5 MPa have slight influence on the bulk modulus. Effective fluid bulk modulus can be expressed as a function of working pressure when the air content is certain.

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Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Measurement with sonic method [9]

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Figure 2

Entrapped air varying process at pressure p

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Figure 3

Bulk modulus variation with pressure under different entrapped air con-tent

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Figure 4

Schematic diagram of bulk modulus measurement

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Figure 5

Bulk modulus measuring device

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Figure 6

Deformation of the chamber and piston

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Figure 7

Photograph of bulk modulus measuring device

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Figure 8

Bulk modulus varying with pressure

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Figure 9

Comparisons of bulk modulus measurements

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