OilDamper Material: Difference between revisions

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See '''''[http://opensees.berkeley.edu/wiki/index.php/BilinearOilDamper_Material BilinearOilDamper]'''''
 
This command is used to construct an OilDamper material, which simulates the hysteretic response of bilinear oil dampers with a valve relief. Two adaptive iterative algorithms have been implemented and validated to solve numerically the constitutive equations within a bilinear oil damper with a high-precision accuracy.
 
{|
| style="background:lime; color:black; width:800px" | '''uniaxialMaterial OilDamper  $matTag  $K $Cd $alpha <$Fr $p> <$LGap> < $NM $RelTol $AbsTol $MaxHalf> '''
|}
 
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{|
|  style="width:150px" | '''$matTag ''' || integer tag identifying material
|-
|  '''$K ''' || Elastic stiffness of linear spring (to model the axial flexibility of an oil damper (brace and damper portion)
|-
|  '''$Cd ''' || Viscous parameter of oil damper
|-
|  '''$alpha ''' || Viscocity exponent
|-
| '''$Fr ''' || Damper relief force (Damper property)
|-
| '''$p ''' || Post-relief damping coefficient ratio (Damper property)
|-
|  '''$LGap ''' || gap length to simulate the gap length due to the pin tolerance
|-
|  '''$NM ''' || Employed adaptive numerical algorithm (default value NM = 1; 1 = Dormand-Prince54, 2=adaptive finite difference)
|-
|  '''$RelTol ''' || Tolerance for absolute relative error control of the adaptive iterative algorithm (default value 10^-6)
|-
|  '''$AbsTol ''' ||  Tolerance for absolute error control of adaptive iterative algorithm (default value 10^-6)
|-
|  '''$MaxHalf ''' ||  Maximum number of sub-step iterations within an integration step (default value 15)
|-
|}
 
----
 
'''Examples:'''
|-
 
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'''References''':
{|
|  style="width:5px" | '''[1]''' || Akcelyan, S., and Lignos, D.G. (2015), “Adaptive Numerical Method Algorithms for Nonlinear Viscous and Bilinear Oil Damper Models Under Random Vibrations”, ASCE Journal of Engineering Mechanics, (under review).
|-
|}
Code Developed and Implemented by : <span style="color:blue">  '''''[http://dimitrios-lignos.research.mcgill.ca/PAkcelyan.html Sarven Akcelyan]''''' & '''''[http://dimitrios-lignos.research.mcgill.ca/PLignos.html Prof. Dimitrios G. Lignos]''''', (McGill University) </span>

Latest revision as of 22:37, 28 January 2018