Crash testing and mechanical models Flashcards
What are important properties of Crash Test Dummies?
Crash Test Dummies Important properties:
- Anthropometry
- Bio-fidelity
- Repeatability
- Reproducibility
- Sensitivity
- Instrumentation
- Durability
Explain Anthropometry concerning Dummies?
Anthropometry
It means that the size of the dummy and the mass and mass distribution of all the dummy segments must be representative of those of a human body
Explain Bio-fidelity in relation to Dummies.
Bio-fidelity
It means that the stiffness of the surface and of the different joints must be representative of those of a human body in order to give a realistic motion and interaction with the car interior.
Explain Repeatability in Context of Dummies.
Repeatability
It means that the dummy should give exactly the same response every time it is exposed to identical test conditions.
Explain Reproducibility in relation to Dummies.
Reproducibility
It means that two dummy individuals should give exactly the same response every time they are exposed to identical test conditions.
Explain Sensitivity as a property of Dummies.
Sensitivity
It means that the dummy response should be sensitive to input that affects the injury risk.
It should on the other hand be insensitive to confounding input, like for instance temperature, that does not affect the injury risk.
Explain Instrumentation in the context of Dummies.
Instrumentation
It means that the dummy should be instrumented to measure output signals that are known to indicate injury risk.
These signals could be for instance accelerations, deflections or force measurements
Explain Durability as a property of Dummies.
Durability
It means that the dummy should withstand severe crash loading without damage.
A dummy that breaks during an expensive destructive crash test may make the test results invalid which usually means loss of time and money.
Describe HYBRID III.
Describe a limitation of the Hybrid III in terms of seat belt interaction.
Explain a limitation of the Hybrid III in terms of comparison with human skeleton.
Explain the limiation of the thoracic spine of Hybrid III and how it affects the seatbelt interaction.
Explain an anatomical improvement with THOR in comparison to the Hybrid III.
Name two phases of neck movement.
Give examples of dummy instrumentation.
Explain H-point manikin
The H-Point-Manikin (TE-HPM) is an essential tool for the correct measurements and dummy positioning for many test applications. Naturally, this device needs to be built and calibrated to the tightest tolerances possible.
Explain Free Motion Head Form (FMHF).
A Hybrid III type dummy head launched from inside the vehicle traveling freely through the air so that its forehead strikes the selected target component (e.g. pillar, side rail or header). The head, referred to as a Free Motion Headform or FMH, is instrumented with accelerometers for measurement of head acceleration during the impact. These measurements are then used to calculate the specified injury criterion, HIC. These tests are required by 49 CFR Part 571.201 Occupant protection in interior impact.
What kind of dummy is the EuroSID?
Side Impact
Describe the rib cage of EuroSID 1.
Describe different parts of the BioSID
Explain improvements with P 1 1/2 (TNO/FTSS).
P 1 1/2 (TNO/FTSS) (Child Dummy)
Explain the Force and Deflection Instrumentation of Q3.
Explain acceleration instrumentation of Q3.
Which child dummies are available of Hybrid III.
Describe instrumentation of CRABI. Explain the purpose of CRABI.
