Analysis of a Ballscrew Drive
You can analyze the FRF of a ballscrew drive by clicking the ‘Modal Analysis’ button and export the transfer function result of the ballscrew drive by clicking the ‘Reduced-order TF’ button in the Analysis Toolbox.
l Modal Analysis:
After clicking ‘Modal Analysis’ button, you will open this interface. Selecting a row in the ‘Frequency’ table and clicking the ‘Plot selected Frequency Response’ button, you can see the plot of the frequency response function for the designated nodes number and the frequency range.
Before the plot, maybe you need Modify, Insert or Delete the configuration of the row you want.
Taken Modify as an example, you can select the row Number you want in the ‘Frequency’ table and click the ‘Modify’ button to open the FRF configuration interface.
The Nodes parameters and the plot settings should be configured based on your model properly. After configuration, click the ‘OK’ button to save.
Plot the frequency response function again after the FRF configuration, and see a new FRF result.
l Reduced-order TF
In the structure design interface of the flexible ballscrew drive, clicking the ‘Reduced-order TF’ button in the Analysis Toolbox, you can plot, fit and export the transfer-function.
You should define all the parameters in the Method, Setup and I/O setup sections first.
It includes defining Manual or Automatic, if you want to include rigid mode, Cut-Off Frequency, Damping ratio and the number of modes, input node and output node.
After finishing the definition of all the parameters, click the ‘Plot’ button, the magnitude and phase angle of the frequency response function will be shown.
Click the ‘Fit’ button and the frequency response function curves from the finite element model are fitted and plotted.
Click the ‘Export’ button to export and save the transfer function file of the flexible ballscrew drive model, which is saved as a tf file. The coefficients of the ballscrew drive transfer function can be extracted from the .tf file and input in the transfer function model in s-domain.
Close the configuration interfaces of the flexible ballscrew.