Using SimVT for Virtual Testing Protocols

SimVT has been designed to perform correlation analysis for Virtual Testing Crashworthiness (VTC) protocols. The table below lists the currently supported protocols and the corresponding protocol options in SimVT.

Protocol	Automotive Assessments Protocol in PRIMER (Crash Test; Regulation; Version)	Protocol options in SimVT	Description
Euro NCAP Virtual Far Side Simulation & Assessment Protocol v1.0	Far Side Sled; EuroNCAP; 2024	Euro NCAP Virtual Far Side v1.0	This protocol option is used to configure SimVT for performing the Euro NCAP Virtual Far Side Protocol Validation Criterion 1 check.
C-NCAP Far Side Occupant Protection Protocol (Appendix H)	Far Side Sled; CNCAP; 2024 (WSID)	C-NCAP Far Side Protocol 2024 Working Conditions 1-6 SimVT	This protocol option is used to configure SimVT for checking the correlation fitting index of working conditions 1 to 6 (WSID driver) according to C-NCAP Appendix H.1.2.1.3.
	Far Side Sled; CNCAP; 2024 (SID2-SBLD)	C-NCAP Far Side Protocol 2024 Working Conditions 7-8 SimVT	This protocol option is used to configure SimVT for checking the correlation fitting index of working conditions 7 and 8 (WSID driver) according to C-NCAP Appendix H.1.2.1.3.
	Side Pole; CNCAP; 2024 (WSID+WSID)	C-NCAP Far Side Protocol 2024 Virtual Assessment Certificate (WSID Driver, WSID Passenger)	This protocol option is used to configure SimVT for performing the Virtual Assessment Certificate check of the "Side Pole Impact" with a WSID driver and front passenger, according to C-NCAP Appendix H.1.2.2.2
	Side Pole; CNCAP; 2024 (WSID+ES-2re)	C-NCAP Far Side Protocol 2024 Virtual Assessment Certificate (WSID Driver, ES-2re Passenger)	This protocol option is used to configure SimVT for performing the Virtual Assessment Certificate check of the "Side Pole Impact" with a WSID driver and ES-2re front passenger, according to C-NCAP Appendix H.1.2.2.2

For this process you will first need Automotive Assessment Workflow data (AAWD) for the Ansys LS-DYNA model you wish to process. You can can follow these instructions to create the AAWD in PRIMER before proceeding to the steps below in T/HIS. Note that you can create the AAWD before running a simulation to help ensure that your model will output all of the required results data for processing according to the Euro NCAP Virtual Far Side protocol.

If you have defined the Automotive Assessment Workflow data (AAWD) for the Ansys LS-DYNA model you wish to process then SimVT will automatically configure itself to use the corresponding protocol option.

Steps in T/HIS

The steps below assume that you have Ansys LS-DYNA simulation data and ISO-MME or CSV test data. If you have converted your Ansys LS-DYNA simulation data to ISO-MME data (using Ansys LS-DYNA to ISO-MME) or CSV data (by writing X,Y,Y,Y data from T/HIS), then you will need to follow steps 1-5 of the quick start guide to use SimVT without Ansys LS-DYNA Results instead of steps 1-5 below.

Open T/HIS and read in the Ansys LS-DYNA results (e.g. binout000 or .thf files) you wish to use with the SimVT Workflow.
Select Tools → Workflows. Note, if you have “Open Menu Automatically” checked you can skip this step.
Filter for "Virtual Testing" and select SimVT
In the Correlation Setup window, click Import ISO-MME or CSV… to select an ISO-MME index file (the extension should be “.mmi”, “.chn” or “.iso”).
SelectT1 as the "Reference test" and select M1 as the simulation (both should be set to this automatically).
Follow steps for specific to the selected protocol option linked below:
To correlate between simulation and test data, the data must contain matching pairs of ISO-MME channel codes. Add/remove any channel matching rules that you require to match T1 channels to M1. Note that test data typically uses filter class "P" whereas simulation data uses filter class "0" so the filter class equivalence ISO rule"P|0" is added by default to facilitate matching test data to simulation data.
Select the channels you wish to correlate in the channel list (or select all of them by clicking All). Any channels that are greyed out are missing from the provided simulation and/or test data.
Click Correlate. The setup window will disappear, and it will be replaced by three windows:
1. Progress window
2. Correlation Table
3. Plotting Controls
Once the progress window has disappeared you can inspect the results in the Correlation Table and plot the correlation graphs by using the buttons in the table.
You can also perform corrective operations to the input curves.
Finally, you can export a summary of the results as a CSV file, and save your SimVT settings for a future session.

Protocol Option Steps

Euro NCAP Virtual Far Side v1.0

6.1. In the "Protocol" section of the setup window select Euro NCAP Virtual Far Side v1.0 (this will be automatically selected if you are using Ansys LS-DYNA results with AAWD). This will configure the following SimVT settings that are specific to the protocol:

The correlation method will be set to "ISO/TS 18571:2024"
The curves will be automatically regularised to 10 kHz before correlating
The channels list will change to show "protocol channels" rather than "selectable channels" which makes it easier to identify which channels may be expected, by the protocol, but are missing from either the simulation or test data
Protocol channels that specify the filter class will be automatically derived by filtering the corresponding unfiltered channel if they are not already defined
The "Calculate Head Excursion" button will become active, and can be clicked to set the maximum evaluation window time to the time of the maximum head excursion + 20%.

6.2. Click Calculate Head Excursion to set the maximum evaluation window time to the time of the maximum head excursion + 20% (provided that the head excursion can be computed from the selected simulation channels and the analysis curves have a duration that exceeds the cut off).

6.3. Inspect the head excursion plot that appears and read the message in the information window to check that the simulation passes (i.e. ensure that the simulation has run for long enough). If it fails, you will need to re-run the analysis for a longer time before repeating these steps.

C-NCAP Far Side Protocol 2024 Working Conditions 1-6 SimVT

6.1. In the "Protocol" section of the setup window select C-NCAP Far Side Protocol 2024 Working Conditions 1-6 SimVT (this will be automatically selected if you are using Ansys LS-DYNA results with AAWD). This will configure the following SimVT settings that are specific to the protocol:

The correlation method will be set to "ISO/TS 18571:2024"
The curves will be automatically regularised to 10 kHz before correlating
The channels list will change to show "protocol channels" rather than "selectable channels" which makes it easier to identify which channels may be expected, by the protocol, but are missing from either the simulation or test data
Protocol channels that specify the filter class will be automatically derived by filtering the corresponding unfiltered channel if they are not already defined
The "Calculate Head Excursion" button will become active, and can be clicked to set the maximum evaluation window time to the time of the maximum head excursion if it is greater than the default cut-off of 1.5 seconds

6.2. Click Calculate Head Excursion. If the "Head Offset (for C-NCAP calculation)" node is not defined then you will need to enter the offset in the window that appears. The offset is the vector from the head CoG to "the front end point of the circular hole at the top of the head" (C-NCAP Appendix H.1.2.1.3.3a). For the supported WSID dummies the vector has been measured to be (0.00616 m, 0.00230 m, 0.09998 m). You should check this measurement for the WSID dummy you are using and input the X, Y and Z offsets in meters accordingly. Then click Calculate.

6.3. Inspect the head excursion plot that appears and read the message in the information window to check that the head excursion is realistic. If the time of maximum head excursion (t_head_max) exceeds 0.15 seconds then it the maximum evaluation interval should be set to the time of

C-NCAP Far Side Protocol 2024 Working Conditions 7-8 SimVT

6.1. In the "Protocol" section of the setup window select C-NCAP Far Side Protocol 2024 Working Conditions 7-8 SimVT (this will be automatically selected if you are using Ansys LS-DYNA results with AAWD). This will configure the following SimVT settings that are specific to the protocol:

The correlation method will be set to "ISO/TS 18571:2024"
The curves will be automatically regularised to 10 kHz before correlating
The channels list will change to show "protocol channels" rather than "selectable channels" which makes it easier to identify which channels may be expected, by the protocol, but are missing from either the simulation or test data
Protocol channels that specify the filter class will be automatically derived by filtering the corresponding unfiltered channel if they are not already defined
The "Calculate Head Excursion" button will become active, and can be clicked to set the maximum evaluation window time to the time of the maximum head excursion if it is greater than the default cut-off of 1.5 seconds

6.2. Click Calculate Head Excursion. If the "Head Offset (for C-NCAP calculation)" node is not defined then you will need to enter the offset in the window that appears. The offset is the vector from the head CoG to "the front end point of the circular hole at the top of the head" (C-NCAP Appendix H.1.2.1.3.3a). For the supported SID-IIs dummies the vector has been measured to be (0.00283 m, -0.0009 m , 0.09811 m). You should check this measurement for the WSID dummy you are using and input the X, Y and Z offsets in meters accordingly. Then click Calculate.

C-NCAP Far Side Protocol 2024 Virtual Assessment Certificate (WSID Driver, WSID Passenger)

6.1. In the "Protocol" section of the setup window select C-NCAP Far Side Protocol 2024 Virtual Assessment Certificate (WSID Driver, WSID Passenger) (this will be automatically selected if you are using Ansys LS-DYNA results with AAWD). This will configure the following SimVT settings that are specific to the protocol:

The correlation method will be set to "ISO/TS 18571:2024"
The curves will be automatically regularised to 10 kHz before correlating
The channels list will change to show "protocol channels" rather than "selectable channels" which makes it easier to identify which channels may be expected, by the protocol, but are missing from either the simulation or test data
Protocol channels that specify the filter class will be automatically derived by filtering the corresponding unfiltered channel if they are not already defined

C-NCAP Far Side Protocol 2024 Virtual Assessment Certificate (WSID Driver, ES-2rePassenger)

6.1. In the "Protocol" section of the setup window select C-NCAP Far Side Protocol 2024 Virtual Assessment Certificate (WSID Driver, ES-2re Passenger) (this will be automatically selected if you are using Ansys LS-DYNA results with AAWD). This will configure the following SimVT settings that are specific to the protocol:

The correlation method will be set to "ISO/TS 18571:2024"
The curves will be automatically regularised to 10 kHz before correlating
The channels list will change to show "protocol channels" rather than "selectable channels" which makes it easier to identify which channels may be expected, by the protocol, but are missing from either the simulation or test data
Protocol channels that specify the filter class will be automatically derived by filtering the corresponding unfiltered channel if they are not already defined

Virtual Testing Automation in REPORTER

If you save your SimVT settings in step 12 above, you can then use the associated SimVT REPORTER template to automate the correlation process and generate a report of the sensor scores and the validation result.

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