EP1158096B1 - Dispositif apte à reproduire les caractéristiques d'adhérence d'un véhicule sur un sol - Google Patents
Dispositif apte à reproduire les caractéristiques d'adhérence d'un véhicule sur un sol Download PDFInfo
- Publication number
- EP1158096B1 EP1158096B1 EP01401382A EP01401382A EP1158096B1 EP 1158096 B1 EP1158096 B1 EP 1158096B1 EP 01401382 A EP01401382 A EP 01401382A EP 01401382 A EP01401382 A EP 01401382A EP 1158096 B1 EP1158096 B1 EP 1158096B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating
- spherical elements
- vehicle
- reproducing
- microbeads
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000576 coating method Methods 0.000 claims abstract description 24
- 239000011248 coating agent Substances 0.000 claims abstract description 23
- 239000003981 vehicle Substances 0.000 claims abstract description 13
- 239000004568 cement Substances 0.000 claims abstract description 11
- 244000025254 Cannabis sativa Species 0.000 claims abstract description 8
- 239000004576 sand Substances 0.000 claims abstract description 5
- 239000011521 glass Substances 0.000 claims abstract description 4
- 239000004005 microsphere Substances 0.000 claims abstract description 4
- 238000005498 polishing Methods 0.000 claims abstract description 4
- 239000011806 microball Substances 0.000 claims abstract 4
- 238000005096 rolling process Methods 0.000 claims description 2
- 239000011325 microbead Substances 0.000 description 19
- 239000010410 layer Substances 0.000 description 10
- 238000012360 testing method Methods 0.000 description 8
- 238000011084 recovery Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C9/00—Special pavings; Pavings for special parts of roads or airfields
Definitions
- the present invention relates to the field of adhesion testing of vehicles more particularly on snow-covered ground or covered with wet grass and has for object a device capable of reproducing the characteristics adhesion of such soils.
- Another solution is to carry out tests on wet grass. This solution is technically acceptable but the rapid degradation of the land does not not allow successive tests to be carried out under the same conditions.
- a less expensive solution consists of a concrete coating with a very smooth finish.
- the coefficient of adhesion obtained by watering is approximately 0.3 ce which is close to the one on snowy ground.
- the value of said coefficient is not not modifiable and the necessary presence of expansion joints causes variations in said coefficient detrimental to the accuracy of the tests.
- this solution involves risks of resumption of adhesion on the expansion joints as well that a non-homogeneity of the adhesion.
- Another solution consists of a floor made of glass and onto which is projected water: However this solution is more like aquaplaning simulations than rolling on snow. In addition, this solution is very expensive.
- the object of the invention is to remedy the aforementioned drawbacks by proposing a device capable of reproducing the grip characteristics of snow-covered ground or covered with wet grass, especially for wheeled vehicles whose mass is between 0.5 and 40 tonnes and also suitable for use anywhere and whatever the season.
- the solution provided is a device capable of reproducing the characteristics grip of a vehicle on snowy ground or covered with wet grass, device characterized in that it comprises a coating on which are arranged several layers of spherical elements, the spherical elements of the upper layers being able to roll one over the other.
- the spherical elements consist of microbeads and / or microspheres.
- the coating has surface roughness allowing microbeads from the lower layer to lodge there.
- the coating consists of cement and preferably calcareous sand-cement with a polishing coefficient perhaps accelerated by 0.37 and the percentage of cement is 6.5% by mass.
- all or part of the spherical elements have a diameter between 200 and 4000 micrometers.
- the spherical elements are made of glass.
- the microbeads form, on the coating a layer of 2 to 6mm.
- Figure 1 shows a device capable of reproducing the characteristics grip of a vehicle on snowy ground or ground covered with wet grass.
- This device consists of a coating 1 on which microbeads 2 are arranged on several thicknesses or layers 5, 6. These microbeads are free on the coating and also between them.
- the coating is made of limestone cement sand with a coefficient of accelerated polishing is 0.37 and the percentage of cement of approximately 6.5% in mass.
- This coating is perfectly flat and produced in the form of a 90 cm disc. meters in diameter and preferably includes a recovery channel on its entire lower periphery to prevent microbeads from being entrained beyond of the coating.
- the microbeads 2 are, in this embodiment, all substantially of the same diameter, or about 1000 micrometers. The quantity is sufficient to ensure a total thickness of the microbeads of 3 to 4mm.
- the coating 1 has roughness 3 which the function is to prevent the entrainment of all the microbeads during the passage of a vehicle.
- the vehicle to be tested tows a screen, the function of which is to homogeneously re-spread the microbeads.
- microbeads In the absence of such a towed mesh, microbeads must be upgraded when the vehicle has twenty passages.
- the roughness of the coating allows the microbeads to the lower layer 4 to lodge therein and thus, the upper layers of microbeads 5 and 6, roll relative to each other with little friction.
- Microbeads of layer 4 are not driven in the direction of movement of the vehicle. As a result, there is almost never an unexpected recovery in grip and turns can be carried out without degrading the adhesion conditions.
- the coefficient of adhesion obtained is about 0.3.
- the coating could have a different shape from a disc, for example the shape of a road or a running circuit large enough to be able to perform baffle tests and turns, making it possible to check the behavior of vehicles on curves.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
- Automatic Cycles, And Cycles In General (AREA)
- Steering Devices For Bicycles And Motorcycles (AREA)
- Tires In General (AREA)
- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
- Road Signs Or Road Markings (AREA)
- Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)
Description
- La figure 1 montre un schéma d'un dispositif selon l'invention
- La figure 2 présente un positionnement de microbilles sur un revêtement présentant des aspérités dans un dispositif selon une variante de réalisation de l'invention.
Claims (9)
- Dispositif apte à reproduire les caractéristiques d'adhérence d'un véhicule sur un sol enneigé ou recouvert d'herbe humide, caractérisé en ce qu'il comporte un revêtement (1) sur lequel sont disposées plusieurs couches (5; 6) d'éléments sphériques (2), les éléments sphériques des couches supérieures étant aptes à rouler les uns par rapport aux autres.
- Dispositif selon la revendication 1, caractérisé en ce que les éléments sphériques (2) sont constitués par des microbilles et/ou des microsphères.
- Dispositif selon l'une quelconque des revendications 1 et 2, caractérisé en ce que le revêtement (1) comporte des aspérités (3) en surface permettant à des microbilles de la couche inférieure de s'y loger.
- Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le revêtement est en sable ciment calcaire.
- Dispositif selon la revendication 1, caractérisé en ce que le coefficient de polissage accéléré du sable ciment calcaire constitutif du revêtement est de 0,37.
- Dispositif selon l'une quelconque des revendications 4 à 5, caractérisé en ce que le pourcentage de ciment d'environ 6,5% en masse.
- Dispositif selon l'une quelconque des revendications 1 à 6, caractérisé en ce que les éléments sphériques ont un diamètre compris entre 200 et 4000 micromètres.
- Dispositif selon l'une quelconque des revendications 1 à 7, caractérisé en ce que les éléments sphériques sont en verre.
- Dispositif selon l'une quelconque des revendications 1 à 8, caractérisé en ce que les éléments sphériques (2) forment, au-dessus du revêtement (1), une couche de 2 à 6mm.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0006756 | 2000-05-26 | ||
FR0006756A FR2809422B1 (fr) | 2000-05-26 | 2000-05-26 | Dispositif apte a reproduire les caracteristiques d'adherence d'un vehicule sur un sol enneige ou recouvert d'herbe humide |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1158096A1 EP1158096A1 (fr) | 2001-11-28 |
EP1158096B1 true EP1158096B1 (fr) | 2003-10-08 |
Family
ID=8850655
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01401382A Expired - Lifetime EP1158096B1 (fr) | 2000-05-26 | 2001-05-28 | Dispositif apte à reproduire les caractéristiques d'adhérence d'un véhicule sur un sol |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1158096B1 (fr) |
AT (1) | ATE251694T1 (fr) |
DE (1) | DE60100922T2 (fr) |
ES (1) | ES2208531T3 (fr) |
FR (1) | FR2809422B1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2858337B1 (fr) * | 2003-07-31 | 2005-10-14 | France Etat Armement | Dispositif apte a reproduire les caracteristiques d'adherence heterogene d'un vehicule |
CN106906713A (zh) * | 2017-03-10 | 2017-06-30 | 泰州夏北新型绿色建材科技有限公司 | 一种改进结构的植草砖 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR726252A (fr) * | 1930-11-16 | 1932-05-26 | Procédé de pavage | |
US2555078A (en) * | 1946-05-21 | 1951-05-29 | Peter J Gaylor | Skating surface |
FR2656014B1 (fr) * | 1989-12-19 | 1992-04-03 | Lefoll Pierre | Revetement pour court de tennis. |
US5352062A (en) * | 1991-09-13 | 1994-10-04 | Nippon Hodo Company, Limited | Skid road surface and method for constructing same |
AUPM388794A0 (en) * | 1994-02-16 | 1994-03-10 | Kelly, Luke Gregory | Beadcrete |
-
2000
- 2000-05-26 FR FR0006756A patent/FR2809422B1/fr not_active Expired - Fee Related
-
2001
- 2001-05-28 AT AT01401382T patent/ATE251694T1/de not_active IP Right Cessation
- 2001-05-28 DE DE60100922T patent/DE60100922T2/de not_active Expired - Lifetime
- 2001-05-28 EP EP01401382A patent/EP1158096B1/fr not_active Expired - Lifetime
- 2001-05-28 ES ES01401382T patent/ES2208531T3/es not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE60100922D1 (de) | 2003-11-13 |
FR2809422B1 (fr) | 2003-08-01 |
ES2208531T3 (es) | 2004-06-16 |
ATE251694T1 (de) | 2003-10-15 |
FR2809422A1 (fr) | 2001-11-30 |
DE60100922T2 (de) | 2004-09-09 |
EP1158096A1 (fr) | 2001-11-28 |
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