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Modal analysis - Stiffness Matrix - Simulink vehicle suspension model

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Mattia Abrate
Mattia Abrate 2022-3-2
回答： Kartik Saxena 2024-3-19
Hi to everyone! I made a 7DOF suspension vehicle model in Simulink, I need to perform a modal analysis and to do it, I have to extract stiffness mass and damping matrices somehow. Can someone give me some guidelines??
Thanks.
Mattia

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Kartik Saxena
Kartik Saxena 2024-3-19
Hi,
In order to perform a general Modal Analysis, we can follow the following guidelines:
1. Linearize Your Model
First, you need to linearize your Simulink model to obtain a linear state-space representation (A, B, C, D matrices) of the system around a specific operating point. Use the 'linmod', 'linmod2', or 'linearize' function to linearize your Simulink model.
2. Extract Mass, Damping, and Stiffness Matrices
Once you have the state-space model, you can derive the mass (M), damping (C), and stiffness (K) matrices.
3. Perform Modal Analysis
With the M, C, and K matrices, you can now perform modal analysis to find the natural frequencies, damping ratios, and mode shapes.
I hope it helps.

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