Comparison of component damping models
In MORe you can choose from different component damping models. To help you decide which to use, the following table gives you a description, advantages and disadvantages of the the different models.
MODEL | DESCRIPTION | ADVANTAGES | DISADVANTAGES |
Rayleigh damping | Mass (alpha) and stiffness (beta) proportional damping | Approved method. Damping with just two parameters. | Useful damping values only in a limited frequency range. High frequency modes are highly (supercritically) damped. |
Constant modal damping | All modes have a constant damping ratio | Easy to use | Weakly damped high frequency modes could slow down transient solver. |
Segmented modal damping | Modes below “Max. eigenfrequency” from reduction settings have constant damping. Up to 2 times max. eigenfrequency the damping linearly increases to 100%. | Easy to use. High-frequency modes not over- or underdamped | Not the full control over granular damping adjustment. |
Tabular modal damping | Each mode has an individual damping ratio | Full control. Applicable for large differences between in damping of different modes, e.g., caused by different materials such as rubber and metal in the same component. | Often missing evidence for granular damping adjustment. Table needs to be adjusted manually. |
Tabular modal damping with import from ANSYS | Import of damping values from damped modal analysis in ANSYS | Full control. Applicable for large differences between in damping of different modes. Different materials can be configured with different damping properties in ANSYS. | Activate and adjust configure modal analyses in ANSYS. Damping values often unknown. |