Sensitivity analysis of two-dimensional viscoelastic film casting processes using transfer functions by transient frequency response method

The sensitivity of two-dimensional (2-D) film casting processes for viscoelastic fluids is investigated using a transfer function approach based on the transient frequency response method. The transient responses of state variables to step-changed film tension have been conveniently changed into cor...

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Bibliographic Details
Published in:Korea-Australia rheology journal 2017, 29(1), , pp.67-73
Main Authors: Kwon, Ilyoung, Chun, Byoungjin, Chun, Myung-Suk, Jung, Hyun Wook, Hyun, Jae Chun
Format: Article
Language:English
Subjects:
Aspect ratio
Characterization and Evaluation of Materials
Chemistry and Materials Science
Complex Fluids and Microfluidics
Deborah number
Food Science
Frequency response
Laplace transforms
Materials Science
Mechanical Engineering
Polymer Sciences
Sensitivity analysis
Short Communication
Soft and Granular Matter
Stability
State variable
Transfer functions
Transient response
Two dimensional analysis
Viscoelastic fluids
Viscoelasticity
공학일반
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Summary:The sensitivity of two-dimensional (2-D) film casting processes for viscoelastic fluids is investigated using a transfer function approach based on the transient frequency response method. The transient responses of state variables to step-changed film tension have been conveniently changed into corresponding transfer functions via the Laplace transform in a tension-controlled system. The transfer function between take-up velocity and film tension plays a key role in elucidating both sensitivity and the stability of film drawing systems. Various amplitude ratios of state variables are effectively evaluated over a wide range of frequencies when an ongoing disturbance is imposed at take-up velocity. The aspect ratio (up to 1 in this study) tends to make the system less sensitive to disturbances. The effect of viscoelasticity on the sensitivity is related to stability patterns, which depend on the aspect ratio and Deborah number.
ISSN:1226-119X
2093-7660
DOI:10.1007/s13367-017-0008-0