When determining the stiffness and damping coefficients for a journal or thrust bearings/seals with computational fluid dynamics (CFD) method, the typical consideration from the literature is to consider the radial perturbation for journal bearings/seals and axial perturbation for thrust bearings/seals, there are few papers about the angular perturbation (due to tilting motion) for journal and thrust bearings/seals. My questions are:
Why don't the moment stiffness and damping coefficients be considered?
Are moment stiffness and damping coefficients excitation frequency-dependent as well?
Thanks in advance,
Kan
Have a look to my work:
https://www.researchgate.net/publication/287583469_Pressure_distribution_in_small_hydrodynamic_journal_bearings_considering_cavitation_A_numerical_approach_based_on_the_open-source_CFD_code_OpenFOAMR?ev=prf_pub
With OF you can solve the fluid-dynamics of the journal bearing and extract all the coefficiencts you need.
Franco
Article Pressure distribution in small hydrodynamic journal bearings...
I hope to have understand correctly your request: if this is the case, in the paper it is reported the PV (power loss) map for different efficiency rations and rotational speed. From this you can extract the moment coefficient and solve your dubts concerning it's dependency from the frequency.
Let me know
Franco
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