Dorel Europe Safety Dorel Europe Safety CenterCenter

Force transmitted by Support leg

Julien KERDREUXFrançois RENAUDIN

Erik SALTERSYoann BRUNETIERE

SummarySummary

• Target• Description of the tests

– Pulses– Measurement device– Type of seats tested– Type of floor flexibility

• Analysis– Force level– Dummy criteria

• Conclusion

Target of the StudyTarget of the Study

1. Measurement of load level transmitted by Support legs on the floor.

2. Evaluation of dummy safety criteria with floor flexibility

Description of the testsDescription of the tests

Pulses

Using a R44 bench 2 types of pulses were applied on each type of seat tested

R44 Pulse

Description of the testsDescription of the tests

Pulses

Using a R44 bench 2 types of pulses were applied on each type of seat tested

Euroncap type pulse

Description of the testsDescription of the tests

Measurement Device

Load Sensor :Mono AxialMax Load 500 DaN/sensor

Support Leg

Load sensor * 4

Rigid floor

R44 Bench

Sled

Description of the testsDescription of the tests

Type of Seats

Seat A :

Group 1 FWF

Maxi Cosi Priorifix

Weight : 14.6 kg

Description of the testsDescription of the tests

Type of Seats

Seat B :

Group 1 RWF

Recaro Polaric

Weight : 13.6 kg

Description of the testsDescription of the tests

Type of Seats

Seat C :Group 0+ RWFMaxi Cosi Cabriofix+ Easyfix baseWeight : 12.2 kg

Tests performed only in R44

Description of the testsDescription of the tests

Type of Floor

Different type of 50 mm thick materials were placed on the initial bench floor:

• A rigid spacer• A 84 g/l foam• A 35 g/l foam• A 25 g/l foam

The different foam were given by Renault. They seem to be EPP foams

25 g/l35 g/l

84 g/l

Analysis of ResultsAnalysis of Results

Force to the Floor – R44

Gr1 RWF Seat B

Gr1 FWF Seat A

Gr0+ RWF Seat C

SeatA

PrioriFix

BRecaro Polaric

CCabrioFix (EasyFix)

Dummy P3 P3 P1.5 Maximum Force (N) 3956 5681 2750

Analysis of ResultsAnalysis of Results

Force to the Floor – EuroNcap

Gr1 RWF Seat B

Gr1 FWF Seat A

SeatA

PrioriFix

BRecaro Polaric

Dummy P3 P3 Maximum Force (N) 4295 6334

Analysis of ResultsAnalysis of Results

Force to the Floor / Floor Flexibility / R44

R44

2500

3000

3500

4000

4500

5000

5500

6000

∞ 84 35.5 25

Material Floor density (kg/m3)

Max

imu

m F

orc

ei (

N)

Seat C CabrioFix Seat A PrioriFix Seat B Polaric

R44

0

10

20

30

40

50

60

∞ 84 35.5 25

Material Floor density (kg/m3)

Max

imum

cru

sh (

mm

)

Seat C CabrioFix Seat A PrioriFix Seat B Polaric

Analysis of ResultsAnalysis of Results

Force to the Floor / Floor Flexibility

EuroNcap

0

1000

2000

3000

4000

5000

6000

7000

8000

∞ 84 35.5

Material Floor density

Max

imum

For

ce (

N)

Seat A PrioriFIx Seat B Polaric

EuroNcap

0

10

20

30

40

50

60

∞ 84 35.5

Material Floor density

Max

imum

Cru

sh (

mm

)

Seat A PrioriFIx Seat B Polaric

Analysis of ResultsAnalysis of Results

Force to the lower Isofix Anchorages – R44

0

1000

2000

3000

4000

5000

6000

7000

8000

9000

Max

imum

For

ce (

N)

∞ 84 35.5 25

Floor Density (kg/m3)

R44 - Lower Anchorage Maximum Load

Seat A PrioriFix Seat C CabrioFix Seat B Polaric

Analysis of ResultsAnalysis of Results

Dummy criteria – Head Excursion Seat A

R44

355

360

365

370

375

380

385

390

395

400

405

410

0 10 20 30 40 50 60

Crush (mm)

Hea

d D

isp

lace

men

t /C

r (m

m)

PrioriFix

Analysis of ResultsAnalysis of Results

Dummy criteria – Head Excursion Seat B and C

R44

510

520

530

540

550

560

570

580

590

0 5 10 15 20 25 30 35 40 45 50

Crush (mm)

Hea

d D

isp

lace

men

t / C

r (m

m)

Seat B Polaric Seat C Cabriofix

Analysis of ResultsAnalysis of Results

Dummy criteria – Thorax and Head Acceleration

R44

0

10

20

30

40

50

60

acce

lera

tion

(g)

∞ 84 35.5

Floor Density (kg/m3)

R44 Head Acceleration

Seat A Priorifix Seat B Polaric Seat C Cabriofix

0

5

10

15

20

25

30

35

40

45

acce

lera

tion

(g)

∞ 84 35.5

Floor Density (kg/m3)

R44 Chest Acceleration

Seat A Priorifix Seat B Polaric Seat C Cabriofix

Analysis of ResultsAnalysis of Results

Dummy criteria – Thorax and Head Acceleration

R44

44

46

48

50

52

54

56

acce

lera

tion

(g)

∞ 84 35.5

Floor Density (kg/m3)

EuroNcap Head Acceleration

Seat A Priorifix Seat B Polaric

0

10

20

30

40

50

60

acce

lera

tion

(g)

∞ 84 35.5

Floor Density (kg/m3)

EuroNcap Chest Acceleration

Seat A Priorifix Seat B Polaric

ConclusionConclusion

• Force transmitted by support leg are dependant of CRS weight and configuration.

• The highest load are given by Gr1 Rearward Facing.• The floor flexibility range given by Renault were either too

stiff without big deformation or too soft reaching the maximum available deformation.

• The floor flexibility didn’t show significant increase of Head or Thorax deceleration

• The support leg intrusion into the floor can produce increase of Head Displacement and must be limited.