Oasys LS-DYNA Environment 8.1 VOLUME 3 ... - Oasys Software

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Oasys LS-DYNA Environment: User Guide (Version 8.1) Results: OASYS D3PLOT: LOBOTTO INTEGRATION Displacement 0 -4 -8 -12 -16 -20 Z_DISPLACEMENT -18.20 -15.60 -13.00 -10.40 -7.80 -5.20 -2.60 .00 x 1.0E-03 Y Z .015340 -24 E-3 -28 0 E-3 2 4 6 8 Time 10 12 14 16 Disp z - node 31 LOBOTTO INTEGRATION Oasys T/HIS Version 7.0 5-Feb-97 Oasys T/HIS Version 7.0 5-Feb-97 X Page A.86
Oasys LS-DYNA Environment: User Guide (Version 8.1) LS-DYNA Manual Section: *LOAD_BODY_GENERALIZED Additional Sections: *DEFINE_CURVE *CONTROL_DAMPING Example of: Rotating Elements Example Filename: shell_global.key Description: A body has constant angular velocity. The radial vibration introduced due to the rapid deployment of the rotation is damped out in the initialization phase using dynamic relaxation. Model: The body measures 200 × 100 × 10 mm 3 . The body consists of 2 Belytschko-Tsay elastic shell elements. The body rotates about the y-axis at 62.83 radians per second. The analysis ends at 0.1 seconds. Input: All nodes have an initial translational velocity based on the angular velocity v=omega x r. (*LOAD_BODY_GENERALIZED, *DEFINE_CURVE). Dynamic relaxation damps oscillations in the radial direction during the initialization. This essentially pre-stresses the structure and the load continues into the analysis portion. (*LOAD_BODY_GENERALIZED) Because of the condition of constant angular velocity of the two nodes on the axis of rotation, the motion remains uniform throughout the calculation (*INITIAL_VELOCITY_NODE). Reference: Schweizerhof, K. and Weimer, K. Page A.87
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Oasys LS-DYNA Environment 8.1 VOLUME 3 ... - Oasys Software

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