Sled Rig
A large pendulum was developed to mimic high speed impacts that typically occur during motor vehicle sports accidents. The pendulum structure was designed and built to be able to swing a 400kg cockpit type assembly into a hydraulic stopper, which results in impact forces of up to 45G’s over a time period of 50 milliseconds.
A 50th percentile Hybrid III ATD with a total of 23 sensors was used to measure the forces on the vehicle occupant. An eDAQ Lite was used to capture the data at 10 kHz and to trigger the Photron SAE 3 high speed camera which recorded at 1000 fps and a resolution of 1024 x 1024. nCode Glyphworks was used to post process the data according to the SAE J211 protocol.
A large flow was created to allow the engineer to review and compare up to 6 different test events. A template was also created which allowed for easy report creation after data analysis. This pendulum design can now be used to test various impact scenarios during the product Research and Design phase.
The graphs below show the NASCAR pulse velocity and acceleration used to qualify product to SFI 38.1.
NASCAR Pulse Velocity
NASCAR Pulse Acceleration
Test Requirements
≥ 45G impact pulse over 50ms
0º frontal impact, adjustable to 30º / 45º / 90º and 0º rear impact
Record dummy response at 10000 Hz
High Speed Camera footage
Leatt® Test Setup
Hybrid III 50th percentile male ATD
Hydraulic Impact pendulum – 6.5m vertical lift = ±40km/h impact
High Speed Camera - Photron SAE3 – 1000fps @ 1024x1024
Non-flicker lights – Dedo DLH 200D
Data Acquisition - 23 measured channels – eDAQ Lite – 10000 Hz sample rate
Post Processing software – nCode Glyphworks - filtered at SAE
J211/1 Rev. March 95
ATD adjustments & Setup
Images from a test run taken with the high speed camera.
The graphs below show the similarity of the test results obtained from official Delphi testing and with the Leatt® sled rig.
