Sensitivity Analysis is the next step in the post-processing of SnRD Post. The standard
post-processing in SnRD offers the functionality to generate time domain displacement
plots of each of the node-pairs of all the E-lines that are present in the model. The
purpose of the Sensitivity Analysis is to study the root cause of rattle and/or squeak
at each E-Line. Two main diagnosis functionalities are enabled in SnRD sensitivity
analysis step and are listed below.
Determination of Relative Modal Contribution to squeak and rattle of complete
E-Lines and as well as at specific points on each E-Line
Capability to check the effect of changing the percentage of modal contribution
on the squeak and rattle performance
The Sensitivity Analsysis tab is as shown below. Figure 1.
Below are the operations you can perform in the Sensitivity Analysis tab.
Result File - select the results file loaded in the SnRD Main
Tab
Subcase Name - select the subcase associated with the selected Result
File
Modal Result File (h3d) - select a H3D file containing the modal contribution
results.
Calculation Type
The sensitivity analysis is a two step process.
The first step is to calculate the Relative Modal Contribution of
the required E-Line to be analyzed.
The second step is to observe the change in results when the modal
contribution is varied but either including a certain mode or
excluding it from result calculations with the help of Modal
Sensitivity study. The relative modal contribution for a particular
E-Line can be calculated and studied in two ways:
Study the modal contribution of the complete E-Line
Study the modal contribution of a particular node pair of an
E-Line
The post-processing done on SnRD results provides the information about
the E-Lines that are exhibiting undesired squeak and rattle behavior. In the
sensitivity analysis the problematic E-Lines can be chosen for study. The
post-processing results also provide the information about which node-pair
of an E-Line show the highest undesirable results.
