Rayleigh damping in Abaqus
Rayleigh damping in Abaqus
(OP)
Dear all friends,
Is there any one who know the unit of w (the natural frequency) and fraction of critical damping in the equations of the Rayleigh damping?
The equations are the followings:
aR=2*w1*w2*(the fraction of critical damping)/(w1+w2)
&
BR=2*(the fraction of critical damping)/(w1+w2)
What is the unit of w? Rad/sec or Hz?
Does the fraction of critical damping substitute in term of percent(%)? (e.g, 0.05 or 5)
I look to hear a positive response from you.
Thank you so much.
Is there any one who know the unit of w (the natural frequency) and fraction of critical damping in the equations of the Rayleigh damping?
The equations are the followings:
aR=2*w1*w2*(the fraction of critical damping)/(w1+w2)
&
BR=2*(the fraction of critical damping)/(w1+w2)
What is the unit of w? Rad/sec or Hz?
Does the fraction of critical damping substitute in term of percent(%)? (e.g, 0.05 or 5)
I look to hear a positive response from you.
Thank you so much.





RE: Rayleigh damping in Abaqus
RE: Rayleigh damping in Abaqus
Thank you so much for your response. As a consequence, I should substitute those parameters in the above equations in term of units which you pointed out them, do not I?
Would you please introduce me a text book or a resource that refers to that units which you told me, because I want to refer my information to them.
Thank you for your response
Best regards.
RE: Rayleigh damping in Abaqus
1. natural frequency of the system,
2. critical damping of a system with viscous damping,
Once you introduce these into a formula for Rayleigh damping, you will end up with a system of two equations with two unknowns (ALPHA and BETA), solution of which gives equations you have quoted.
RE: Rayleigh damping in Abaqus
Thank you so much for your response.