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Explicitly define spring and dashpot coefficients
Posted Feb 2, 2024, 5:42 a.m. EST Modeling Tools & Definitions, Equation-Based Modeling, Structural Dynamics 1 Reply
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Hi,
I am performing an Frequency Domain analysis for a simple structure. The soil is represented by the springs and dashpots. However, the issue is that the spring/dashpot coefficients depend on the frequency and are explicitly defined in the table (i.e. for 1Hz -> K1, C1; for 2Hz -> K2, C2; ...).
I am not sure how to: (1) input that values into COMSOL in a table format (if I even need it) (2) apply springs and damping dashpots that would take the values from the table for each individual frequency
I hope someone will be able to help me
Bests, Irakli
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You can make an Interpolation under Definitions. It may have a name such int1. Then, make a variable K1 (Definitions->Variables). And define that as int1(freq), where freq is a frequency variable defined already within COMSOL. Under the spring you set the stiffness to K1, and when you run a frequency sweep, the frequency dependency of K1 is known.
-------------------René Christensen, PhD
Acculution ApS
www.acculution.com
info@acculution.com