asymmetric damping matrix
asymmetric damping matrix
(OP)
I'm having a hard time wrapping my head around the concept of an asymetric damping matrix.
What would be a good real world example of this?
Could distributing stiffness and damping coefficients over a finite area (for use in a FE model) produce these asymmetric matrices?
What would be a good real world example of this?
Could distributing stiffness and damping coefficients over a finite area (for use in a FE model) produce these asymmetric matrices?





RE: asymmetric damping matrix
Cheers
Greg Locock
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RE: asymmetric damping matrix
Gyroscopic effects in rotating machinery are represented by skew-symmetric terms in the damping matrix.
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(2B)+(2B)' ?
RE: asymmetric damping matrix
Symmetric terms in the stiffness matrix represent conservative forces.
Example: typical spring behavior.
Symmetric terms in the damping matrix represent non-conservative forces.
Example: typical damping behavior.
Skew symmetric terms in the stiffness matrix represent non-conservative forces.
Example: gyroscopic effect. Note that we use "forces" in the generalized sense.
Something like:
d^2/dt^2 (I * theta_x) - w*I*theta_y = Mx
d^2/dt^2 (I * theta_y) + w*I*theta_x = My
where theta_x and theta_y are tilt angle of the disk
Skew symmetric terms in the damping matrix represent conservative forces.
Example: skew-symmetric component of fluid bearing stiffness. Radial displacement of CCW rotating shaft in the x direction causes force in the y direction (oil flows tangentially in the clearance).
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(2B)+(2B)' ?
RE: asymmetric damping matrix
=====================================
(2B)+(2B)' ?
RE: asymmetric damping matrix
=====================================
(2B)+(2B)' ?