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MESYS Calculation Software

If this setting is activated a gyroscopic matrix is considered in the calculation of natural frequencies. The mass inertia around x-axis and the speed of the shaft are required for this gyroscopic matrix.

 

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The all_img3-button allows some additional inputs for the Campbell diagram:

The diagram is generated for speeds between start and end factor times the current input value for speed.

The number of speeds is the number of calculation points. Reduce it for faster calculation.

The number of harmonics shows additional lines for multiples of shaft speed.

The accuracy for critical frequency is a tolerance for calculation of critical speeds as intersections of shaft speed and natural frequency.

If ‘Increase accuracy for mode changes’ is selected additional points are calculated when an axial mode changed into a radial mode for example.

If ‘Calculate critical frequencies’ is selected the critical frequencies are calculated when the Campbell diagram is shown. Else it is only calculated for the report of critical speeds.

If ‘Consider gear frequencies’ is selected additional lines for gear tooth frequencies are shown and the corresponding critical frequencies are calculated.

If the simplified method for harmonic response is activated, the harmonic response is calculated as superposition of mode shapes. The accuracy of the solutions depends of the calculated number of mode shapes in this case. For large systems the calculation can be faster if the option is activated. The result is more accurate if it is not activated.

Coefficients for global Rayleigh damping are used to define a global damping matrix as D=α*M+β*K using the global mass matrix M and the global stiffness matrix K. Using the sizing button, the values can be calculated so that a user defined damping ratio will result for two given frequencies.