Airbag Triggering Timing Impact Simulation
"Explore the impact of triggering timing on multiple airbags in a 3D lag scenario. Compare scenarios with the same and different trigger timings as a sphere impacts five airbags. Dive into the details of part IDs, masses, boundary conditions, and initial velocities. Analyze contact interactions and runtime variations. Understand the sensor keywords related to triggering times in a comprehensive simulation setup."
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Presentation Transcript
IMPACT MULTIPLE AIRBAGS WITH TRIGGER TIMING 3D LAG IMPACT MULTIPLE AIRBAGS WITH TRIGGER TIMING 3D LAG 1.1 m/s SCENARIO (for all airbags) A : Same trigger timing B : Different trigger timing UNITS m:kg:s:Pa:N:K
SCENARIO The scenarios simulates a sphere impacting FIVE airbags. Scenario A triggers through switches all the airbags at the same time. Scenario B triggers through switches all airbags at different times. Fixed Ground
PART ID AND MASSES NODES AND ELEMENTS
INITIAL VELOCITY SPHERE GRAVITY
Contact GROUND To AIRBAG-3 Contact AIRBAG-3 To AIRBAG-5 Contact AIRBAG-5 To AIRBAG-7 Contact AIRBAG-7 To AIRBAG-9 Contact AIRBAG-11 To SPHERE Contact AIRBAG-9 To AIRBAG-11
PARTS AND BOUNDARY CONDITIONS NB Same for all airbags
SAME TRIGGER DIFFERENT TRIGGER NB Same for all airbags and curves Airbag5 Curve105 Airbag7 Curve107 Airbag9 Curve109 Airbag11 Curve111
RUNTIMES SAME TRIGGER DIFFERENT TRIGGER
OFF OFF OFF OFF OFF OFF NB All airbags trigger at different times OFF OFF OFF OFF ON ON NB All airbags trigger at the same time ON ON ON ON ON ON ON ON AIRBAG TRIGGERING TIME
SENSOR KEYWORDS (same triggering time) NB. Simulation runtime 0.1s Sensor switch 1, 2, 3, 4 and 5 are turned off at time 0.0s. Sensor switch 1, 2, 3, 4 and 5 are turned on at time 0.0025s. (0.0025,0.005) VALUE TIME
NB. Simulation runtime 0.1s SENSOR KEYWORDS (different triggering time) Sensor switch 1, 2, 3, 4 and 5 are turned off at time 0.0s. Sensor switch 1 is on at time 0.005s. Sensor switch 2 is on at time 0.010s. Sensor switch 3 is on at time 0.015s. Sensor switch 4 is on at time 0.020s. Sensor switch 5 is on at time 0.025s. (0.025,0.05) (0.020,0.04) VALUE (0.015,0.03) (0.010,0.02) (0.005,0.01) TIME NB All curves 203, 205, 207, 209 and 211 are the same
LS-DYNA RESULTS 0ms SCENARIO A NB Airbags begin to inflate at 2.5ms 25ms 50ms 75ms 100ms 10ms 20ms 75ms 100ms SCENARIO B NB Airbags begin to inflate at 5ms, 10ms, 15ms, 20ms and 25ms
SPHERE SPHERE SPHERE KINETIC ENERGY SPHERE KINETIC ENERGY AIRBAGS CONTACT FORCE AIRBAGS Input dm/dt TIME PLOTS - SAME TRIGGER TIMING 2.5ms
SPHERE SPHERE SPHERE KINETIC ENERGY SPHERE KINETIC ENERGY AIRBAGS CONTACT FORCE AIRBAGS INPUT DM/DT TIME PLOTS - DIFERENT TRIGGER TIMING 5ms 10ms 15ms 20ms 25ms
