A servovalve controlled hydraulic motor driven centrifugal pump was dynamically modelled using linearized analysis. The expressions for the system gain, natural frequency, and damping ratio in terms of component physical parameters were derived. An optimization model estimation procedure was developed and applied to the step responses of such a system constructed of common commercial components. The experimental system had a 4.2 Hz natural frequency and 1.2 damping ratio. The research indicates that the dynamic responses of a servovalve controlled centrifugal pump can be appropriately modelled for applications in industry and agriculture where the output flow rate needs to be dynamically changed.

1.
Ace Pump Corporation, 1985, Operating & Maintenance Instructions for Ace Centrifugal Pump/Hydraulic Motor Combinations, Memphis, TN: Ace Pump Corporation.
2.
Cheremisinoff, N. P., 1981, Fluid Flow Pumps, Pipes and Channels, Ann Arbor, MI: Ann Arbor Science Publishers, Inc.
3.
Karassik, I. J., 1989, Centrifugal Pump Clinic, 2nd ed., New York: Marcel Dekker.
4.
Knapp
R. T.
,
1937
, “
Complete Characteristics of Centrifugal Pumps and Their Use in the Prediction of Transient Behavior
,”
ASME Trans.
, Vol.
59
, pp.
683
689
.
5.
Lobanoff, V. S., and Ross, R. R., 1985, Centrifugal Pumps Design & Application, Houston: Gulf Publishing Company.
6.
Merritt, H. E., 1967, Hydraulic Control Systems, New York: John Wiley.
7.
Moog Controls, 1989, 62 Series Servovalves, East Aurora, New York: Moog Controls.
8.
Schueller, J. K., and Wang, M. W., 1992, “Spatially-Variable Control of Field Machinery Integrating Control Theory and a GIS,” International Conference on Agricultural Engineering, Paper No. 9206.07. Uppsala, Sweden, June 1–4.
9.
Schueller
J. K.
,
1992
, “
A Review and Integrating Analysis of Spatially-Variable Control of Crop Production
,”
Fertilizer Research
, Vol.
33
, pp.
1
34
.
10.
Tsukamoto
H.
, and
Ohashi
H.
,
1982
, “
Transient Characteristics of a Centrifugal Pump During Starting Period
,”
ASME Journal of Fluids Engineering
, Vol.
104
, pp.
6
14
.
11.
Tsukamoto
H.
, and
Matsunaga
S.
,
1986
, “
Transient Characteristics of a Centrifugal Pump During Stopping Period
,”
ASME Journal of Fluids Engineering
, Vol.
108
, pp.
392
399
.
12.
Watton, J., 1989, Fluid Power Systems, Englewood Cliffs, NJ. Prentice Hall.
13.
Xu, Liangji, 1991, Dynamic and Static Analysis of a Servovalve Controlled Hydraulic Motor Driven Centrifugal Pump, Unpublished Master’s thesis. University of Florida, Mechanical Engineering Department.
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