1. How to do Decay Analysis

  • Displacement in SIMO

  • Static parameter variation in Riflex

  • Time domain

    • specified force in SIMO

    • specified force in Riflex

2. Time domain - displacement in SIMO

  • Move the body to a fixed position

  • Define variables for the position of the body , for instance x and y position

  • Set the environment to none or use a small wave

  • Make a variable for the static equilibrium calculation. Turn off the static equilibrium, (false) . The equilibrium will be calculated in dynamic analysis.

script
calc eq

  • Make a condition

  • Add the variables

    • simulation length, x and y position and calculateEqubilibrium

condition
decay plot

3. Riflex - Static

  • Move the fixed node 3m in x-direction

bcond 1
bcond 2

  • Time domain

    • Use boundary change and set the node free

tdcond
td plot

4. Time domain - specified force in SIMO

  • Ramp force

    • Activation time = 0s

    • Deactivation time = 100s

    • Force derivative =+/-10000 N/s

  • Constant force

    • Activation time = 100s

    • Deactivation time = 400s

    • Force derivative =+/-10000 N/s

  • Set the direction vector

specforce
forcepos
srforceplot

5. Time domain - specified force in Riflex

  • Ramp force

    • Activation time = 0s

    • Deactivation time = 100s

    • Force derivative =+/-10000 N/s

  • Constant force

    • Activation time = 100s

    • Deactivation time = 400s

    • Force derivative =+/-10000 N/s

tdsr
tdsrplot

6. All three cases

all

7. Example files

Download the example files from the following link decay_examples.stask