Brazil 2014ugm Pre Certification of Rops for Agricultural Tractors

8/10/2019 Brazil 2014ugm Pre Certification of Rops for Agricultural Tractors

1/23

Pre-certification of ROPS for agricultural

tractors through CAE technology

Igor Saveljevas Rodrigues - VirtualCAE

8/10/2019 Brazil 2014ugm Pre Certification of Rops for Agricultural Tractors

2/23

Topics

Company : VirtualCAE

Federal Regulation

Norm : ABNT NBR ISO 5700:2009

Agriculture companies

Static analysis: Simplifications

Contact

Material

Loads and boundary conditions

Survival cell

Results

Next steps

8/10/2019 Brazil 2014ugm Pre Certification of Rops for Agricultural Tractors

3/23

VirtualCAE

8/10/2019 Brazil 2014ugm Pre Certification of Rops for Agricultural Tractors

4/23

8/10/2019 Brazil 2014ugm Pre Certification of Rops for Agricultural Tractors

5/23

Reference : Massey Ferguson

ROPS

Figure 1 Tractor with or without ROPS

ROPS Roll over protective structure

Retrieved from : http://www.massey.com.br/produtos/tratores/serie-mf-2600/(Mar, 2014)

8/10/2019 Brazil 2014ugm Pre Certification of Rops for Agricultural Tractors

6/23

ABNT NBR ISO 5700:2009

Federal regulation do not determine norms

Either procedures or methods

Where? > Technical standards (ISO, ABNT...)

ISO 5700:2009

Destructive testing

Static loads Survivall cell

Certification of ROPS in case of tractor roll over

8/10/2019 Brazil 2014ugm Pre Certification of Rops for Agricultural Tractors

7/23

Agriculture companies

Outsourcing : cabin

Cabin is used on several types of tractors

Outsourcing : virtual certification

Destructive test

8/10/2019 Brazil 2014ugm Pre Certification of Rops for Agricultural Tractors

8/23

Simplifications

Figure 2 ROPS test

Retrieved from : http://www.agrital.com/english/tecnicoUK.htm/(Mar, 2014)

Reference : Agrital

Reduce the solvingtime without changing

the results

8/10/2019 Brazil 2014ugm Pre Certification of Rops for Agricultural Tractors

9/23

Static analysis : simplifications

Figure 3 Axis and transmission

Retrieved from : http://www.directindustry.com/prod/zf-maschinenantriebe/powershift-transmission-tractors-16154-653933.html(Mar, 2014)

Reference : ZF Reference : the Author

Figure 4 Rear support

8/10/2019 Brazil 2014ugm Pre Certification of Rops for Agricultural Tractors

10/23

Static analysis : simplifications

Figure 5 Elastic damper

Retrieved from : https://brammeronline.de/product/info/397007/name/MEGU_5718228_50NR11_KONUSLAGER_FREUDENBERG(Mar, 2014)

Reference : Brammer

Figure 6 Front support

Reference : the Author

8/10/2019 Brazil 2014ugm Pre Certification of Rops for Agricultural Tractors

11/23

Static analysis : simplifications

Small radius and holes

Extraction of middle surface

Assembly corrections

Screws

Simplification of some geometries

8/10/2019 Brazil 2014ugm Pre Certification of Rops for Agricultural Tractors

12/23

Static analysis : contact

Figure 7 Contact

Reference : the author

8/10/2019 Brazil 2014ugm Pre Certification of Rops for Agricultural Tractors

13/23

Static analysis : material

Graphic 1 AISI 1020 Stress-strain curve

Reference : MatWeb

Retrieved from : http://www.matweb.com/search/DataSheet.aspx?MatGUID=b58ee61a3745453a9232f7864abba74f(Mar, 2014)

8/10/2019 Brazil 2014ugm Pre Certification of Rops for Agricultural Tractors

14/23

Static analysis : loads

Table 1 - ROPS LOADS

ID Load Criteria Definition

1 Rear longitudinal Energy E = 1,4 x mass

2 Rear crush Force F = 20 x mass3 Side transverse Energy E = 1,75 x mass

4 Front crush Force F = 20 x mass

ROPS must be approved in each test

The structure must not penetrate the survival cell

8/10/2019 Brazil 2014ugm Pre Certification of Rops for Agricultural Tractors

15/23

1 2

Rear Longitudinal Rear Crush

Static analysis : loads

Figure 8

Loads

Reference : the author

8/10/2019 Brazil 2014ugm Pre Certification of Rops for Agricultural Tractors

16/23

Static analysis : loads

Figure 9

Loads

Reference : the author

4

Side transverse Front Crush

3

8/10/2019 Brazil 2014ugm Pre Certification of Rops for Agricultural Tractors

17/23

Static analysis : boundary conditions

Figure 10 Boundary conditions

Reference : the author

8/10/2019 Brazil 2014ugm Pre Certification of Rops for Agricultural Tractors

18/23

Static analysis : survival cell

Figure 11 Survival cell

Reference : the author

Figure 12 Standard specification

Reference : ABNT ISO 5700:2009

8/10/2019 Brazil 2014ugm Pre Certification of Rops for Agricultural Tractors

19/23

Static analysis

Figure 13

Final model

Reference : the author

8/10/2019 Brazil 2014ugm Pre Certification of Rops for Agricultural Tractors

20/23

Results

Reference : the author

Figure 14

Deformation

8/10/2019 Brazil 2014ugm Pre Certification of Rops for Agricultural Tractors

21/23

Results

Reference : the author

Figure 15Energy probe

A

B

A : Energy : rear longitudinal

B : Energy : side transverse

8/10/2019 Brazil 2014ugm Pre Certification of Rops for Agricultural Tractors

22/23

Next Steps

Comparison between the real test and thevirtual simulation

Improve the virtual model to reduce the error

between the tests

Certify someday only by CAE technology

8/10/2019 Brazil 2014ugm Pre Certification of Rops for Agricultural Tractors

23/23