1 How to create an Accelerometer in Hypermesh for

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					                     How to create an Accelerometer in Hypermesh for use in LS-DYNA
                                                Option 1

•   Create an elastic material collector (type 1) and use the following properties
           o Rho = 7.89E-09
           o E = 210000
           o NU = 0.3
•   Create a properties collector using SecSld as card image
•   Create a component collector and call it accelerometer
•   Create a 25 mm x 25 mm x 25mm cube in the new component you just created.




•   Link component, material and properties
•   Translate the accelerometer you just created to the location specified in your test report (tools, translate)
•   Create a *CONSTRAINED_NODAL_RIGID_BODY
           o Select 1D menu
           o Select rigids
           o Select multiple nodes (as in figure below)




           o Select all 8 nodes of cube, and the 4 nodes to connect to your part (make sure you select all 8
             nodes of the cube)
           o Select create (figure below)


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•   Select card
            o Select element (click on the NRB you just created)
            o Select edit
            o Set the IPRT option to 1 (figure below)
•   Go to the BCs menu
•   Select control cards
            o Select Next (next page)
            o Select CONTROL_OUTPUT
                       Turn on the optional card
                       Set IPRTF to 2 (MAKE SURE IT IS SET = 2)
                       Select return
            o Select DATABASE_OPTION
                       Set RBDOUT to be 2E-04
                       Select return




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                    How to create an Accelerometer in Hypermesh for use in LS-DYNA
                                               Option 2

•   Create a rigid material collector (type 20) and use the following properties
           o Rho = 7.89E-09
           o E = 210000
           o NU = 0.3
•   Create a properties collector using SecSld as card image
•   Create a component collector and call it accelerometer
•   Create a 25 mm x 25 mm x 25 mm cube in the new component you just created.




•   Link component, material and properties
•   Translate the accelerometer you just created to the location specified in your test report (tools, translate)
•   Connect your accelerometer (solid element) to sheet metal (based on location) using extra nodes for rigid
    bodies (connects a rigid body, accelerometer, to a non-rigid body)
           o Select BCs
           o Select interfaces
           o Toggle create
           o Type in a name
           o Type and card image = XtraNode
           o Select create edit
           o Select PID from the LS-DYNA card
           o Select the accelerometer component you just created
           o Toggle add
           o Select entity (under slave)
           o Select 4 nodes representing the accelerometer attachment
           o Select add
           o If you turn the element handle on in your options menu you will be able to see the slave nodes
               associated with the rigid part that you just added




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•   Create a triangular element representing your co-ordinate system
           o Under element types change tri3 to accel and update the element you just created
•   Assign accelerometer properties (i.e. selecting the output nodes) to the solid element
           o Select tools menu
           o Select safety menu
           o Select output block
           o Name = acc1
           o Select the node you want to output data
           o Select create
           o You can view your LS-DYNA card that you just created by selecting edit.




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