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# PyPK
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PyPK is a collection of p-k methods for solving the flutter equation.
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The original p-k method is described in [Rodden, Aerodynamic lag functions, divergence, and the British flutter method](https://doi.org/10.2514/3.44772) and its non-iterative version is described in [van Zyl, Aeroelastic Divergence and Aerodynamic Lag Roots](https://doi.org/10.2514/2.2806). The mode tracking algorithm is described in [van Zyl, Use of eigenvectors in the solution of the flutter equation](https://doi.org/10.2514/3.46380).
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## Install and run
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If you only want to use PyPK, you can install it using
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```bash
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