J-SEATdesigner Functions

Database for models and assembly data

For automotive crash simulation, the dummy-boundary condition combinations that meet the assessments must be managed properly. J-SEATdesigner works in cooperation with an object-oriented relational database to manage the model and the associated data required for auto assembling. Users can access the database via the GUI to read models and add/remove/rename/save auto-assembly data.

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  Database access

  J-SEATdesigner uses the object-oriented relational database to store the simulation models and the associated data individually. This structure allows the use of the simulation model and the associated data in a variety of combinations. Users can access the database via the GUI to read models and add/remove/rename/save auto-assembly data.

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  Addition of auto-assembly data

  J-SEATdesigner can add the auto-assembly data to existing dummy models registered in the database. The auto-assembly data includes the +x / -x directions; the dummy type; part sets for contact definition; part sets for seatbelt refitting; and tree definition for positioning.

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  System construction appropriate for the current architecture

  The database server can be built in either at a client workstation or as a standalone server. Additionally, the file server to save models can be isolated. The J-SEATdesigner is capable of adapting to the user’s current system architecture.

Model auto-assemble

Loading a pre-defined Assembly information will automatically perform the procedures for assembling models: reading models from the database, positioning each model, defining contacts/connections, positioning dummies and seats, seatbelt fitting, and Import pre-simulation results. The resulting assembled model can be output in an LS-DYNA input file format.

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  Loading models

  J-SEATdesigner automatically loads the model written in the Assembly information from the database.

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  Positioning and contact/connection definition

  Auto-positioning a dummy according to the Assembly information. Contact/connection conditions defined in the Assembly information are automatically applied.

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  Dummy positioning

  Auto-recognize the target point saved in the Assembly information to position a dummy. All the users have to do is turn the positioning switch to "ON."

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  Positioning seats

  When the user inputs the seat angle and position and turns on the switch, J-SEATdesigner automatically performs seat positioning in accordance with the mechanism defined for the seat.

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  Seatbelt fitting

  Turning the switch on after the seat/dummy positioning will automatically run the seatbelt fitting.

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  Import a seating simulation result

  The seating simulation result can be imported from the database.

Interface for Assembly information creation

The Assembly information for the auto-assembling model is created via the J-SEATdesigner GUI, which was developed based on the GUI of ARUP software PRIMER. The J-SEATdesigner GUI consists of the project management, tool kit, and DB management panels. This easy setting and user-friendly GUI supports the design and simulation engineers who need to deal with various vehicle models, regulations/assessments, and simulation cases.

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  Project management panel

  J-SEATdesigner's project management panel tree view allows users to understand the associated regulations, the test condition, and the necessity of pre-simulations for each simulation case at sight. Users can copy/remove/rename a simulation case, run an LS-DYNA simulation, and perform auto model assembling from this panel.

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  Auto-assemble a model meeting the required regulations and assessments.

  J-SEATdesigner can define dummy/boundary condition/control card according to the regulations/assessments specified from the corresponding management panels. Changing the regulation to use will automatically change the dummy/boundary condition/control card accordingly.

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  Simulation cases

  To create a new simulation case, go to the management panel and specify the conditions including connections, contacts, and positioning. Copying and modifying the current simulation case will make it easier to create a similar simulation case.

Building a model for pre-simulation

Automobile crash simulation might require simulation results performed prior to the crash simulation: H-point measuring and seating simulations. The J-SEATdesigner GUI supports the performing of such pre-simulations. Users can import the result of the pre-simulation via the J-SEATdesigner GUI and then proceed to building a model efficiently.

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  H-point measurement simulation

  J-SEATdesigner includes the Arup H-Point manikin (HPM). The HPM supports the SAE, ECE, and Japanese safety standards. Users can run an LS-DYNA simulation with the auto-set HRM. The resulting H-Point coordinate and torso angle can be used in the positioning.

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  Seating simulation

  Switch a dummy to rigid and move it to H-point, to auto-create a simulation model. The database can store the parts of the seat foam or the flame that comprises deformable parts. Users can run a simulation on the ARUP software PRIMER or on LS-DYNA.

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  THUMS positioning

  J-SEATdesigner uses the simulation based dummy positioning feature of the Arup software PRIMER to perform THUMS (FE human body model) positioning. The cable definition used to perform positioning is auto-set by J-SEATdesigner, and the users input the cable connection point and the drag force. Once the required settings are completed, generate the LS-DYNA input file and run a simulation to import the nodal coordinates from the simulation result.