This paper reports on an important discovery that is: hydrostatic actuation systems are able to manipulate heavy loads with sub-micron precision and large stroke. In this relation, the design of a high-precision hydrostatic actuation system referred to as the ElectroHydraulic Actuator (EHA) is presented. A laboratory prototype of this system has achieved an unprecedented level of performance by being able to move a large load of 20Kg with a precision of 50 nanometers and a stroke of 12cm. This level of performance places the hydrostatic actuation concept in competition with piezoelectric platforms in terms positional accuracy. Experimental results from this prototype are reported and analyzed.

1.
Habibi
S. R.
and
Goldenberg
A. A.
, (
2000
),
Design of a New High Performance ElectroHydraulic Actuator
,
IEEE/ASME Transactions on Mechatronics
, Vol.
5
, No.
2
, pp.
158
164
.
2.
Habibi
S. R.
and
Singh
G.
, (
2000
)
Derivation of Design Requirements for Optimization of a High Performance Hydrostatic Actuation Systems
,
Int. Journal of Fluid Power
, Vol.
1
, Number
2
, pp.
11
29
.
3.
Habibi
S. R.
and
Goldenberg
A. A.
, (
1999
),
Design and analysis of a new symmetrical linear actuator for hydraulic and pneumatic systems
.,
Transaction of the CSME
, Vol.
23
, No.
3&4
, pp.
377
397
.
4.
Habibi
S. R.
,
Pastrakuljic
V.
and
Goldenberg
A. A.
(
2001
)
Experimental Analysis of a High Performance Hydrostatic Actuation System
,
SAE Transactions, Journal of Commercial Vehicles
,
109
, pp.
367
377
.
5.
Blackburn J. F., Reethof G. and Shearer J. L. (1960), Fluid Power Control, The M.I.T. Press.
6.
Merritt H.E. (1967), Hydraulic Control Systems, John Wiley & Sons Inc., 1967.
7.
Viersma T. J. (1980), Analysis, Synthesis and Design of Hydraulic Servo-systems and Pipelines, Elsevier Scientific Publishing Company.
8.
Habibi S. and Richards R., 1991, Computed-torque and variable-structure multivariable control of a hydraulic industrial robot: Pr. Inst Mech Eng., Part I, Vol 205.
9.
Watton J., (1989), Fluid Power Systems, Prentice Hall.
10.
Korn J., (1972), Hydrostatic Transmission Systems, Int. Textbook Ltd.
11.
Manring
N. D.
and
Luecke
G. R.
, (
1998
),
Modeling & Designing a Hydrostatic Transmission with a Fixed-Dis. Motor
,
J. Dyn. Sys. Meas. & Cont.
Vol.
120
, pp.
45
50
.
12.
Desai J. and Bobrow J.E., (1989), Modeling and Analysis of a High Torque Hydrostatic Actuator for Robotic Applications, Exp. Robotics.
13.
Arnautovic S., (1993), Electrohydraulic Actuator, Report, Univ. Toronto.
14.
Lennevi J., (1995), Hydrostatic Transmission Control, Linkoping Studies in Sc. & Tech., No. 395.
15.
Manring N., (2000), The discharge flow ripple of an axial-piston swash-plate type hydrostatic pump, J. Dyn. Sys. Meas. & Cont., V 122.
16.
Chinniah Y., (2004), Fault Detection in the EHA using the EKF, Ph.D. Thesis, University of Saskatchewan.
This content is only available via PDF.
You do not currently have access to this content.