Hydraulic cylinders are generally used as power take-off (PTO) mechanisms in wave energy converters (WECs). The dynamic behavior of its PTO force, which integrates friction and pressure forces, is a difficult constraint to include in an analytical or in a numerical model. In this paper, the PTO force characteristics of a hydraulic cylinder are experimentally and numerically investigated under different magnitudes of controlled excitation force. In order to characterize the dynamic behaviors of PTO force, the displacement, acceleration, and pressure in the cylinder chamber for given excitation forces are measured. The pressure force is calculated using the measured value of the pressure, and the friction force is calculated based on the equation of motion using measured values of the pressure, excitation force, and acceleration of the piston. Experimental results show clearly a strong nonlinear force–velocity characteristics, including stochastic and hysteretic behaviors. To model the hysteretic behavior, the modified LuGre model is used for the friction force and a new approach is proposed for the pressure force. To model the stochastic behavior of the friction and pressure forces, the spectral representation method is used. The systematically comparison between measured and simulated results shows that the numerical model captures most of dynamic behaviors of PTO force.
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March 2018
Research-Article
Experimental and Numerical Studies of Dynamic Behaviors of a Hydraulic Power Take-Off Cylinder Using Spectral Representation Method
Moisés Brito,
Moisés Brito
CERIS,
Instituto Superior Técnico,
Universidade de Lisboa,
Av. Rovisco Pais,
Lisboa 1049-001, Portugal
e-mail: moises.brito@tecnico.ulisboa.pt
Instituto Superior Técnico,
Universidade de Lisboa,
Av. Rovisco Pais,
Lisboa 1049-001, Portugal
e-mail: moises.brito@tecnico.ulisboa.pt
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Luis Teixeira,
Luis Teixeira
Facultad de Ingeniería,
Instituto de Mecánica de los Fluidos
e Ingeniería Ambiental (IMFIA),
Universidad de la República,
Montevideo 11300, Uruguay
e-mail: luistei@fing.edu.uy
Instituto de Mecánica de los Fluidos
e Ingeniería Ambiental (IMFIA),
Universidad de la República,
Montevideo 11300, Uruguay
e-mail: luistei@fing.edu.uy
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Ricardo B. Canelas,
Ricardo B. Canelas
CERIS,
Instituto Superior Técnico,
Universidade de Lisboa,
Av. Rovisco Pais,
Lisboa 1049-001, Portugal
e-mail: ricardo.canelas@tecnico.ulisboa.pt
Instituto Superior Técnico,
Universidade de Lisboa,
Av. Rovisco Pais,
Lisboa 1049-001, Portugal
e-mail: ricardo.canelas@tecnico.ulisboa.pt
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Rui M. L. Ferreira,
Rui M. L. Ferreira
CERIS,
Instituto Superior Técnico,
Universidade de Lisboa,
Av. Rovisco Pais,
Lisboa 1049-001, Portugal
e-mail: ruimferreira@tecnico.ulisboa.pt
Instituto Superior Técnico,
Universidade de Lisboa,
Av. Rovisco Pais,
Lisboa 1049-001, Portugal
e-mail: ruimferreira@tecnico.ulisboa.pt
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Maria G. Neves
Maria G. Neves
Harbours and Maritime Structures Division,
Hydraulics and Environment Department,
Laboratório Nacional de Engenharia
Civil (LNEC),
Av. do Brasil 101,
Lisboa 1700-066, Portugal
e-mail: gneves@lnec.pt
Hydraulics and Environment Department,
Laboratório Nacional de Engenharia
Civil (LNEC),
Av. do Brasil 101,
Lisboa 1700-066, Portugal
e-mail: gneves@lnec.pt
Search for other works by this author on:
Moisés Brito
CERIS,
Instituto Superior Técnico,
Universidade de Lisboa,
Av. Rovisco Pais,
Lisboa 1049-001, Portugal
e-mail: moises.brito@tecnico.ulisboa.pt
Instituto Superior Técnico,
Universidade de Lisboa,
Av. Rovisco Pais,
Lisboa 1049-001, Portugal
e-mail: moises.brito@tecnico.ulisboa.pt
Luis Teixeira
Facultad de Ingeniería,
Instituto de Mecánica de los Fluidos
e Ingeniería Ambiental (IMFIA),
Universidad de la República,
Montevideo 11300, Uruguay
e-mail: luistei@fing.edu.uy
Instituto de Mecánica de los Fluidos
e Ingeniería Ambiental (IMFIA),
Universidad de la República,
Montevideo 11300, Uruguay
e-mail: luistei@fing.edu.uy
Ricardo B. Canelas
CERIS,
Instituto Superior Técnico,
Universidade de Lisboa,
Av. Rovisco Pais,
Lisboa 1049-001, Portugal
e-mail: ricardo.canelas@tecnico.ulisboa.pt
Instituto Superior Técnico,
Universidade de Lisboa,
Av. Rovisco Pais,
Lisboa 1049-001, Portugal
e-mail: ricardo.canelas@tecnico.ulisboa.pt
Rui M. L. Ferreira
CERIS,
Instituto Superior Técnico,
Universidade de Lisboa,
Av. Rovisco Pais,
Lisboa 1049-001, Portugal
e-mail: ruimferreira@tecnico.ulisboa.pt
Instituto Superior Técnico,
Universidade de Lisboa,
Av. Rovisco Pais,
Lisboa 1049-001, Portugal
e-mail: ruimferreira@tecnico.ulisboa.pt
Maria G. Neves
Harbours and Maritime Structures Division,
Hydraulics and Environment Department,
Laboratório Nacional de Engenharia
Civil (LNEC),
Av. do Brasil 101,
Lisboa 1700-066, Portugal
e-mail: gneves@lnec.pt
Hydraulics and Environment Department,
Laboratório Nacional de Engenharia
Civil (LNEC),
Av. do Brasil 101,
Lisboa 1700-066, Portugal
e-mail: gneves@lnec.pt
1Corresponding author.
Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received March 6, 2017; final manuscript received July 18, 2017; published online September 29, 2017. Assoc. Editor: Stephen Boedo.
J. Tribol. Mar 2018, 140(2): 021102 (13 pages)
Published Online: September 29, 2017
Article history
Received:
March 6, 2017
Revised:
July 18, 2017
Citation
Brito, M., Teixeira, L., Canelas, R. B., Ferreira, R. M. L., and Neves, M. G. (September 29, 2017). "Experimental and Numerical Studies of Dynamic Behaviors of a Hydraulic Power Take-Off Cylinder Using Spectral Representation Method." ASME. J. Tribol. March 2018; 140(2): 021102. https://doi.org/10.1115/1.4037464
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