This routine is mainly used to read the stiffness and mass matrices from NASTRAN output file

Go to each test folder, run readKM_test_XXXX.m, select the corresponding *.pch file of interest

when you use it for other model, something you need to change as follow.

Keep improving... (Wei Zhao: weizhao@vt.edu), enjoy!

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1. Change path folder in addpath('') for each case. For example, in test_1 folder,

change the line 43 folder path to yours where the readMass.m and readStiffness.m locate

2. GRDSET is a vector for degrees of freedom constrained

3. For the test cases here, comment 'PARAM,EXTOUT,matrixpch' when you run them for mode results using NASTRAN SOL103

4. *.PCH includes stiffness and mass matrices. They are directly used in eigenvalue computation. We called A-set

5. *.f06 includes eigenvalues and the corresponding eigenvectors from NASTRAN analysis - sol103

6. For nodal labels, it is better to copy them from *.pch after the line 'DMIG* VAX 1 0' and unique these values.

because some grids could possibly not considered in FEM when the element between two nodes has no properties, such as RBE2.

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7. Because Github cannot identify *.pch file automatically, the uploaded stiffness and mass matrices are stored in *.pch1 file.

change them to *.pch when you download them, and run the program.

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