Redesign of dummy impact system test
Typ
Examensarbete för masterexamen
Program
Publicerad
2022
Författare
Anand, Nitin Davangere
Kareti, Priyatham Reddy
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
With the need for testing airbags for unbelted passenger crash scenarios, a component test setup was developed to test the passenger side airbags for the USNCAP
FFRB 25 mph 50th percentile unbelted load case. This test setup simulates the
physics of a frontal vehicle car crash while mimicking the kinematics of a dummy
loading into the airbag. Honeycomb (HC) is used to decelerate the sled that holds
the dummy interacting with the airbag. Although the HC achieves the deceleration
target with a good strength-to-weight ratio, it is plastically deformed and must be
discarded after each test. The purpose of this thesis is to find an alternate deceleration feature that can make the test setup configuration repeatable and robust
for different load cases, thus broadening the scope of the test setup. A comparative study was conducted on different deceleration features and a damper system
proved to be a good alternate to the HC when assessed with design criterias. This
damper system was incorporated into the existing Computer-Aided Engineering
(CAE) model, which is closely validated to the test setup using the finite element
method. This report explores designing a damper with a discrete element feature
available in LS DYNA, and parameter studies were conducted to understand the
damper behaviour. A simplified model was built that could reproduce the physics
of the crash configuration to understand the discrete element characteristic with
multiple iterations. Later the finalised damper was incorporated into the full scale
CAE model by replacing the honeycomb. The findings of this thesis will be useful
to the industry in the future when designing a damper for various load conditions
using Finite Element Analysis (FEA) in the LS DYNA platform.
Beskrivning
Ämne/nyckelord
Component test rig , Damper modelling , Crash deceleration feature , LS DYNA , Finite element