Experimental study of the influence of valve timing on hydraulic motor efficiency

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The timing of the valves of a hydraulic motor plays an important role in determining the throttling energy. To reduce this dominating energy loss, the timing of the valves must allow the fluid in the chamber to be precompressed and decompressed such that there is minimal pressure differential across the transitioning valve. The optimal valve timing to achieve precompression and decompression is a function of the motor displacement, angular velocity, pressure, and air content of the fluid, thus to achieve high efficiency at all conditions, active valve timing is required. The valves in most hydraulic motor architectures are mechanically timed to the piston displacement, rendering it impossible to change the valve timing as a function of operating conditions. This paper presents one novel valve architecture that allows for such processes: a rotary valve that is controlled independently of the piston displacement, enabling active timing control. To validate the concept and test the motor valve at fixed timing and fixed displacement conditions, a prototype valve was installed on a single cylinder 3.5 cc/rev slider-crank piston motor. The nominal timing of the valve was optimized for operation for a pressure of 7 MPa, 2% entrained air by volume, and an angular velocity between 10 and 30 Hz. A model, including the pressure dynamics, leakage, compressibility, check valve dynamics, and geometry dependent parameters is developed, simulated, and compared to the experiment. The experimental system includes instrumentation for measuring the inlet and outlet flow rates, piston position, and pressure in the inlet, outlet, and cylinder. A comparison between the model and experimental data shows good agreement and demonstrate the large impact of valve timing on efficiency.

Original languageEnglish (US)
Title of host publicationASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015
PublisherAmerican Society of Mechanical Engineers
ISBN (Electronic)9780791857236
DOIs
StatePublished - Jan 1 2015
EventASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015 - Chicago, United States
Duration: Oct 12 2015Oct 14 2015

Publication series

NameASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015

Other

OtherASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015
CountryUnited States
CityChicago
Period10/12/1510/14/15

Fingerprint

Hydraulic motors
Piston displacement
Angular velocity
Pistons
Fluids
Engine cylinders
Air
Compressibility
Energy dissipation
Flow rate
Geometry
Experiments

Cite this

Tian, H., & Van De Ven, J. D. (2015). Experimental study of the influence of valve timing on hydraulic motor efficiency. In ASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015 (ASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015). American Society of Mechanical Engineers. https://doi.org/10.1115/FPMC2015-9532

Experimental study of the influence of valve timing on hydraulic motor efficiency. / Tian, Hao; Van De Ven, James D.

ASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015. American Society of Mechanical Engineers, 2015. (ASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Tian, H & Van De Ven, JD 2015, Experimental study of the influence of valve timing on hydraulic motor efficiency. in ASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015. ASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015, American Society of Mechanical Engineers, ASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015, Chicago, United States, 10/12/15. https://doi.org/10.1115/FPMC2015-9532
Tian H, Van De Ven JD. Experimental study of the influence of valve timing on hydraulic motor efficiency. In ASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015. American Society of Mechanical Engineers. 2015. (ASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015). https://doi.org/10.1115/FPMC2015-9532
Tian, Hao ; Van De Ven, James D. / Experimental study of the influence of valve timing on hydraulic motor efficiency. ASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015. American Society of Mechanical Engineers, 2015. (ASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015).
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