use of madymo for simulations of helicopter crash …...2012/10/09  · use of madymo for...

1

Use of Madymo for Simulations of Helicopter Crash Scenarios within the HeliSafe TA Project

M. Blundell., Bastien C., S. Vadlamudi and Y. Zhang

Coventry University

6th European Madymo Users’ meeting, Berlin 2007

2

HELISAFE TA Project

• Helisafe TA (Helicopter Occupant Safety Technology Application) is an EU funded 6th Framework Specific Targeted Research Project that aims to develop improved levels of occupant crash protection for civil helicopters

• The project involves 12 European partner companies and institutions

3

Main Activities

• A major feature of the project is an integrated programme of :– Full scale helicopter crash tests

– Developing occupant protection concepts– Crash test dummy development

– Laboratory based cabin/cockpit mock-up sled tests

– Supporting computer simulation

4

Helisafe TA Partners

• AUTOFLUG (D) The project co-ordinator• CIDAUT (ES) • CIRA (I) • DLR (D)• EUROCOPTER-SAS (F) • EUROCOPTER (D, a subsidiary of EUROCOPTER-SAS) • POLITECNICO DI MILANO (I)• PZL Swidnik S.A. (PL)• TNO Automotive, Safety R&D (NL) • SRS (D, a subsidiary of SIEMENS)• COVENTRY UNIVERSITY (UK)• UNIVERSITY DELFT (NL)

5

Main Activities

6

Overall Simulation Activity Helisafe TA

EC-SASSAMCEF EC Model

AFGReference Scenario

Computer Simulations1st Baseline Drop TestRoll Over CaseReal World Scenarios (influence of surface, crash angles…)Secondary and Multiple Impacts

EC-SASFinite Element

Simulations

DLRDRI-KRASHSimulations

CUMadymo/ADAMS

Simulations

7

Full Helicopter Model Data Management at CU

CUData translation

programsFORTRAN,

MATLAB, EXCEL

MadymoModels

EC-SASSAMCEF data set

8

Overall Simulation Activity in Helisafe TAComputer Simulations1st Baseline Drop TestRoll Over CaseReal World Scenarios (influence of surface, crash angles…)Secondary and Multiple Impacts

9

Simulation work at Coventry• To develop multi-body

based simulation models in Madymo that could be used to simulate full helicopter crash scenarios

• To develop subsystem cockpit/cabin models for more detailed investigation of occupant protection systems

10

Madymo Models including Occupant

Left MLG Right MLG

NLG

11

Helicopter Rollover

• Helicopter Occupants are at risk of several Post-Crash Risk Hazards including fire, smoke and ditching in open water. Preventing injury is essent ial to aid escape. Rollover is significant and can inju re and trap occupants (Survey of 92 NTSB Crash Cases)

703226120042462220Rollover

508611323151655Remote Location

4510910050112255Water122295615391776Fire%No.%No.%No.%No.%No.

No Injuries

MinorInjuries

MajorInjuries

FatalitiesOccupantsCasesPost Crash Risk

12

Full Helicopter with Occupant (Madymo)

Straight Drop - 5m/s Acceleration plot

13

Full Helicopter Roll Over (Madymo)• Landing on uneven ground with occupant

14

Full Scale Crash Test at CIRA• The first of a series of full scale drop test

has been completed at CIRA. The tests will be performed to match a chosen reference scenario. Base line tests will provide local input crash pulse data for the simulation models

• Impact velocity 15.05m/s (Vx=12.8m/s, Vy=7.9m/s), pitch angle 5°nose up

15

Full Scale Crash Test at CIRA• A final test will evaluate new safety

concepts developed using computer simulation and a series of laboratory sled (inertial) tests with dummies and cockpit/cabin mock-up tests.

• The sled tests will be performed at CIDAUT and SRS (Siemens)

16

Full Scale Crash Test at CIRA

17

Cockpit and Cabin Modelling

18

Madymo Modelling

19

Model integration

20

Dummy Responses & Safety Systems• Model acts as a rigid

‘inertia rig’ with local acceleration pulses applied to dummies and seats

• Model allows testing of new safety concepts (harnesses/airbags)

• Model could be used to simulate full-scale or sled tests

• Potential to vary layouts and investigate crash pulses for further scenarios

21

Typical Measured Response• Upper lumbar spinal

forces of pilot and forward-faced dummies obtained from Madymo Simulations of full-scale drop test with the Bell UH-1Dcabin/cockpit model

22

Body centred harness 3/4 point harness 3 point harness

Triangle harness4-point harnessX-harness

Development of new Harness Design Concepts

23

Sled test (HS1 pulse)

-250

-200

-150

-100

-50

0

50

100

0.00 0.10 0.20 0.30 0.40 0.50

Time (s)

Acc

eler

atio

n (m

/s2)

x directionz direction

24

Frontal Impact Simulation• HS1 horizontal pulse

25

Harness Design Concepts for front Seated Occupants• HS1 loading is applied

26

Side impact Simulation

27

Harness Design Concepts for Side Seated Occupants• HS1 loading is applied

28

Investigation of Airbag position

Z=872mm

15’

29

Comparison of Dummy movements• With and without airbag for HS1 and DT1

pulse

30

Conclusions

• A generic helicopter has been modelled in both Madymo

• The capability to include a model of the seat, dummy, restraint system and airbag in a full Madymo helicopter model has been demonstrated

31

Conclusions

• A subsystem cabin/cockpit model has been developed for the test helicopter and can be used for the evaluation of new occupant protection design concepts

• The models have been demonstrated as capable of:– Simulating the evolution of a roll over event– Sled tests– Full scale crash tests

32

Conclusions

• In frontal cases, 4 point harness has given the best injury results for HS1 pulse

• In side impact, body centered harness has given the best injury results for HS1 pulse

• The position of the airbag has been determined and will be used in the final drop test