A Simple maxwell Based Model in Order to Represent the frequency-dependent viscosity measured by ultrasound

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorFranco, Ediguer E.
dc.creatorAdamowski, Julio C.
dc.creatorHiguti, Ricardo T.
dc.creatorBuiochi, Flávio
dc.date2014-05-27T11:23:43Z
dc.date2016-10-25T18:26:16Z
dc.date2014-05-27T11:23:43Z
dc.date2016-10-25T18:26:16Z
dc.date2008-12-01
dc.date.accessioned2017-04-06T01:33:22Z
dc.date.available2017-04-06T01:33:22Z
dc.identifierProceedings - IEEE Ultrasonics Symposium, p. 1905-1907.
dc.identifier1051-0117
dc.identifierhttp://hdl.handle.net/11449/70682
dc.identifierhttp://acervodigital.unesp.br/handle/11449/70682
dc.identifier10.1109/ULTSYM.2008.0469
dc.identifier2-s2.0-67649335622
dc.identifierhttp://dx.doi.org/10.1109/ULTSYM.2008.0469
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/891756
dc.descriptionA previous work showed that viscosity values measured high frequency by ultrasound agreed with the values at low frequency by the rotational viscometer when conditions are met, such as relatively low frequency viscosity. However, these conditions strongly reduce the range of the measurement cell. In order to obtain a measurement range and sensitivity high frequency must used, but it causes a frequency-dependent decrease on the viscosity values. This work introduces a new simple in order to represent this frequency-dependent behavior.model is based on the Maxwell model for viscoelastic , but using a variable parameter. This parameter has physical meaning because it represents the linear behavior the apparent elasticity measured along with the viscosity by .Automotive oils SAE 90 and SAE 250 at 22.5±0.5oC viscosities at low frequency of 0.6 and 6.7 Pa.s, respectively,tested in the range of 1-5 MHz. The model was used in to fit the obtained data using an algorithm of non-linear in Matlab. By including the viscosity at low frequency an unknown fitting parameter, it is possible to extrapolate its . Relative deviations between the values measured by the and extrapolated using the model for the SAE 90 and SAE 250 oils were 5.0% and 15.7%, respectively.©2008 IEEE.
dc.languageeng
dc.relationProceedings - IEEE Ultrasonics Symposium
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectFitting parameters
dc.subjectFrequency-dependent
dc.subjectHigh frequency
dc.subjectLinear behavior
dc.subjectLow frequency
dc.subjectMaxwell models
dc.subjectMeasurement cell
dc.subjectMeasurement range
dc.subjectNon-linear
dc.subjectPhysical meanings
dc.subjectRelative deviations
dc.subjectRotational viscometer
dc.subjectVariable parameters
dc.subjectViscosity value
dc.subjectAcoustic waves
dc.subjectExtrapolation
dc.subjectMATLAB
dc.subjectMaxwell equations
dc.subjectUltrasonics
dc.subjectViscosity
dc.titleA Simple maxwell Based Model in Order to Represent the frequency-dependent viscosity measured by ultrasound
dc.typeOtro


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