The air content in hydraulic transmission fluids significantly reduces bulk modulus of the fluid and causes a drop in the stiffness and response of the hydraulic system. It is consequently very important to monitor the air content in hydraulic fluid for ensuring the hydraulic works in good condition. In this paper, a novel method is presented in which the sampled fluid flows slowly into a vacuum chamber and the pressure of separated air is measured. A model of pressure-time characteristics is established, with moisture content taken into account as well, since moisture is volatile in vacuum and its content in tributyl phosphate (TBP) based fluid is usually too high to be neglected. The model can be simplified, which turned out to be a nonlinear least square problem. Comparison between the measured and calculated value shows that the model matches well with the experimental data.
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March 2014
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Research on Air Content Estimation of Tributyl Phosphate Hydraulic Fluids: A Novel Approach Based on the Vacuum Method
Xiaoping Ouyang,
Xiaoping Ouyang
The State Key Lab of Fluid Power
Transmission and Control,
e-mail: ouyangxp@hotmail.com
Transmission and Control,
Zhejiang University
,Hangzhou Zhejiang 310027
, China
e-mail: ouyangxp@hotmail.com
Search for other works by this author on:
Boqian Fan,
Boqian Fan
The State Key Lab of Fluid Power
Transmission and Control,
e-mail: felix.zju@gmail.com
Transmission and Control,
Zhejiang University
,Hangzhou Zhejiang 310027
, China
e-mail: felix.zju@gmail.com
Search for other works by this author on:
Huayong Yang,
Huayong Yang
The State Key Lab of Fluid Power
Transmission and Control,
e-mail: yhy@zju.edu.cn
Transmission and Control,
Zhejiang University
,Hangzhou Zhejiang 310027
, China
e-mail: yhy@zju.edu.cn
Search for other works by this author on:
Rong Qing
Rong Qing
The State Key Lab of Fluid Power
Transmission and Control,
Transmission and Control,
Zhejiang University
,Hangzhou Zhejiang 310027
, China
Search for other works by this author on:
Xiaoping Ouyang
The State Key Lab of Fluid Power
Transmission and Control,
e-mail: ouyangxp@hotmail.com
Transmission and Control,
Zhejiang University
,Hangzhou Zhejiang 310027
, China
e-mail: ouyangxp@hotmail.com
Boqian Fan
The State Key Lab of Fluid Power
Transmission and Control,
e-mail: felix.zju@gmail.com
Transmission and Control,
Zhejiang University
,Hangzhou Zhejiang 310027
, China
e-mail: felix.zju@gmail.com
Huayong Yang
The State Key Lab of Fluid Power
Transmission and Control,
e-mail: yhy@zju.edu.cn
Transmission and Control,
Zhejiang University
,Hangzhou Zhejiang 310027
, China
e-mail: yhy@zju.edu.cn
Rong Qing
The State Key Lab of Fluid Power
Transmission and Control,
Transmission and Control,
Zhejiang University
,Hangzhou Zhejiang 310027
, China
Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received November 2, 2012; final manuscript received October 22, 2013; published online December 9, 2013. Assoc. Editor: Yang Shi.
J. Dyn. Sys., Meas., Control. Mar 2014, 136(2): 024503 (5 pages)
Published Online: December 9, 2013
Article history
Received:
November 2, 2012
Revision Received:
October 22, 2013
Citation
Ouyang, X., Fan, B., Yang, H., and Qing, R. (December 9, 2013). "Research on Air Content Estimation of Tributyl Phosphate Hydraulic Fluids: A Novel Approach Based on the Vacuum Method." ASME. J. Dyn. Sys., Meas., Control. March 2014; 136(2): 024503. https://doi.org/10.1115/1.4025814
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