Finding Eigenvectors Beyond Critical Load Factor

Tips & Tricks

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The function, which is also known as shifting, allows you to calculate critical load factors beyond a user‑defined initial value. A determination of the critical load factors is usually done from the smallest to the greatest critical load factor.

If the user defines a value for the shift f0, the characteristic polynomial is shifted by this value to the origin. As a result, the calculation first converges to the next larger load increase factor according to f0. When using the module, please note that no load increase factors smaller than f0 are usually determined.

For example, if a structure has the load increment factors (eigenvalues) 2, 3, 4, 5, 7, 8, 9, 11, 15 ... and if the shift with f0 = 7 is selected, the load increase factors 8, 9, 11, 15 ... determined.

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