Reducing the simulation error

Aim:

To compare the results with normal and suggested shell parameters

Procedure:

• Import the file from the existing location using Hyperworks > User profile RADIOSS > Import Solver Deck
• As given in the questions change the run time and select the animation step between 25 - 60
  
  Given run time = 55ms
  Animation step = 40
  `cc "Tfreq" = (Time) / (Animation)`
  `cc "Tfreq" = (55) / (40) => 1.375`
  
• Change the values as we've solved before
  
  
  
  
• Open Analysis > RADIOSS > save the existing location > change option as -nh 4 > click Radioss
• Engine simulation file will create on the existing location. Check the energy error, mass error and determine the results whether it is acceptable or not?
  
  
• Ideally, the error should be at most -15%, better to be -5% and closer to 0% the better
• We get the error value at most -10.3%, so apply the given parameters and check the error if it is better or not
• Getting back to the first iteration changes the parameters under both properties Hat section, Close-out panel by editing through the entity Ishell =24 QEPH, Ismstr=2, Ish3n=2, N=5, Ithick=1, Iplas=1
  
  
  
  
• By checking the error it results at -0.1% better than the previous one, as the element is kept at Qeph the hourglass energy is dissipated at this process.
  
  

Comparison:

• Comparing the Hypergraph 2D with and without considering the given parameters
  
  RIGIDBODY
  WITHOUT PARAMETERS
  
  
  WITH PARAMETERS
  
  
  
  ENERGIES
  WITHOUT PARAMETERS
  
  
  WITH PARAMETERS
  
  
  
• The first graph represents using the Q4 element the hourglass energy exceeds upward and the total energy react accordingly
• By using Qeph the hourglass energy is restricted by the stiffness of the element and it doesn't have any changes in total energy
  
  CONTOUR PLOT
  WITHOUT PARAMETERS
  
  
  WITH PARAMETERS
  
  
• Comparing both these plots the Qeph element results with no Hourglass energy and the computational is perfect

Conclusion:
Understood the formulation between Q4 and Qeph element
Understood how to reduce error in the simulation file