Correlation Setup Window
1. Model List
The models that are present in T/HIS when SimVT is loaded will be listed in the Correlation Setup window. If T/HIS can find Automotive Assessments Workflow Data (AAWD) for a model, it will appear with "Workflow" and the number of channels that are defined for the model next to the model tag (e.g. "M1 (336 channels)"). Alternatively, if T/HIS cannot find AAWD for a model, only the model tag (e.g. "M2") will be shown.
When you mouse over a model in the list, hover text with additional information will appear. This can be useful if you cannot remember which model is which as the hover text contains the path to the model results.
Additionally, if "Time of first sample" was defined (non-zero) in Automotive Assessments PRIMER, it will appear in the hover text with an explanation that "curves will be shifted to start at [Time of first sample] and then any data before t=0 will be discarded":
2. Assign a CSV configuration
Creating AAWD for Ansys LS-DYNA models is the recommended method for using Ansys LS-DYNA model results with SimVT. However, it is possible to use Ansys LS-DYNA results with SimVT without AAWD, but a CSV configuration file needs to be provided to define the channel mapping and the model units and vehicle drive side need to be provided in addition. The button will become active when a model which does not have AAWD is selected from the model list. Click to open a window where the CSV config can be loaded and checked before it is assigned to the selected model.
3. Import an Ansys LS-DYNA Model
Ansys LS-DYNA models can be imported into SimVT for correlating. Click the button to open a file selector window. Navigate to your model file and open it to load the data into SimVT.
4. Import ISO-MME data
ISO-MME test data (v1.6 and v2.0) can be imported into SimVT for correlating. Click to open a file selector window. Navigate to the ".chn" or ".mmi" file in your ISO-MME data and open it to load the data into SimVT.
5. Import CSV data
CSV channel data can be imported into SimVT for correlating. Click to open a file selector window. Navigate to the ".csv" file with your channel data and open it to load the data into SimVT.
6. View a list of the imported data
Imported ISO-MME and CSV data will be displayed in the list along with the number of channels defined by the data.
7. Selecting Reference (test) Source
The drop-down can be used to select the reference model or data source. This is typically physical test data from a laboratory, but an Ansys LS-DYNA model can also be selected (e.g. a baseline model when conducting a sensitivity study). Note that when ISO-MME or CSV data is imported, the reference test will automatically update to the tag of the newly imported data (e.g. T1). This is because imported data is expected to be test data so it is assumed to be the reference data.
8. Select the Simulation(s)
SimVT supports correlating multiple simulations against reference/test data. The simulations that are to be compared against the reference test data can be selected using the drop-down (hold down Shift to select multiple). Note that the reference test data cannot be selected.
9. Select the Virtual Testing Protocol
The selector allows you to select a protocol option so that SimVT will be configured to meet the protocol requirements.
The protocol options are covered in the Using SimVT for Virtual Testing Protocols quick-start guide.
When a protocol is selected an information window will appear to explain the protocol specific configurations that have been applied. The information window for the Euro NCAP Virtual Far Side v1.0 protocol option is shown below.
Some protocol options require the head excursion to be calculated in order to determine the evaluation interval window. If applicable, the will become active. Clicking on it will cause SimVT to calculate* the head excursion (a.k.a. head offset) so that the maximum evaluation interval can be set according to the protocol. Additionally, the head excursions for the selected simulations will be plotted. For the Euro NCAP Virtual Far Side v1.0 protocol option, a message will also appear to communicate which simulations passed or failed (as shown below). Failed simulations should be re-run for longer so that the end time exceeds the cut-off time of 1.2 times the time of maximum head excursion.
*In order to compute the head excursion for a selected simulation, the simulation data source must have the head global Y displacement channel (1?HEAD0000WSDCY0) and the B-Pillar global Y displacement channel (1?BPILLO0000WSDCY0) defined. It is important that both channels should represent global Y displacement because using local Y will result in an incorrect head excursion.
10. Select the Correlation Method
Evaluation intervals can also be set in this section by inputting into 'min' and 'max' to set the values globally or by clicking 'Configure intervals...' to open a window where values can be set individually for each sim vs test model pair.
11. Channel Matching Rules
Channel matching rules can be used to help match channels from different data sources which may differ from the standard ISO-MME naming convention.
12. Inspect the available and selectable channels
The channel list shows the channels for the selected simulation(s) versus the reference test. The selected reference test model (T1) is shown in the first column of the associated model tags. Any selected simulations (M1, M2 and T2) are shown next to it separated by “|” provided that the channel is present in the simulation data (e.g."T2" is not shown for for any of the head acceleration channels shown below because it was not defined for the imported CSV data). Some channels may not be selectable because they are either not defined for (or only defined for) the reference model. They are excluded from the list when Selectable channels is selected, but shown as greyed out rows when All channels is selected to indicate that it is not possible to select them for correlating. For example, in the image below, the filtered head acceleration channels ("11HEAD0000WSACXA", "11HEAD0000WSACYA" and "11HEAD0000WSACZA") are shown as greyed out rows because the channels are not defined for the reference test (T1) so there would be nothing to compare the M1 and M2 simulation curves against.
Selecting will update the list to only show channels which are selectable.
13. Search for channels using regular expressions
The channels shown in the the channel list can be filtered using the search box. The search box uses regular expression matching to determine which channels to show and it is case insensitive. For example searching for "HEAD.*AC" will filter the list to shown only the head acceleration curves.
Or searching for "A$" will shown only the channels where the last character is "A" (i.e. ISO-MME channels that have been filtered with CFC1000).
14. Select the channels to be correlated
Channels to be correlated can be selected from the channel list using a combination of Shift+click and Ctrl+click. Clicking on "" will select all of the channels shown in the list. Clicking on "None" will deselect all the channels. Selected channels will be highlighted in blue and the number of selected channels is indicated on the button.
15. Perform “Simulation(s)” versus “Reference test” correlations on the selected channels
The button will become active when 1 or more channels are selected from the channel list. Click to commence the correlation.
16. Saving SimVT settings files
A SimVT settings file (.simvt) can be saved from the correlation setup window by clicking . The settings file saves all the information required to restore the session (e.g. data sources, correlation method, selected and plotted channels). Note that prior to saving a settings file, a channel selection must be made.
17. Loading SimVT settings files
A SimVT settings file (.simvt) can be loaded from the Correlation Setup window by clicking . The model mapping window will appear which can be used to (re)assign models before loading the settings. When the settings are loaded the correlation will be automatically performed and the Correlation Table window will appear.