EP1502997A1 - Vorrichtung zur Wiedergabe der heterogenen Strassenhaftung eines Fahrzeuges - Google Patents

Vorrichtung zur Wiedergabe der heterogenen Strassenhaftung eines Fahrzeuges Download PDF

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Publication number
EP1502997A1
EP1502997A1 EP04291724A EP04291724A EP1502997A1 EP 1502997 A1 EP1502997 A1 EP 1502997A1 EP 04291724 A EP04291724 A EP 04291724A EP 04291724 A EP04291724 A EP 04291724A EP 1502997 A1 EP1502997 A1 EP 1502997A1
Authority
EP
European Patent Office
Prior art keywords
coating
aggregates
band
vehicle
adhesion
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.)
Granted
Application number
EP04291724A
Other languages
English (en)
French (fr)
Other versions
EP1502997B1 (de
Inventor
Vincent Schmitt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Direction General de lArmement DGA
Gouvernement de la Republique Francaise
Original Assignee
Delegation Generale pour lArmement
Gouvernement de la Republique Francaise
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Delegation Generale pour lArmement, Gouvernement de la Republique Francaise filed Critical Delegation Generale pour lArmement
Publication of EP1502997A1 publication Critical patent/EP1502997A1/de
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Publication of EP1502997B1 publication Critical patent/EP1502997B1/de
Anticipated expiration legal-status Critical
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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, in particular equipped with stability control systems, traction or braking, on a heterogeneously adhered soil, which is asymmetrical relative to the longitudinal axis of the vehicle when the wheels on one side of the vehicle are on dry soil while that on the other side are on snowy or grassy ground wet, either undergoing a sudden change in adhesion, for example, during transition from dry soil adhesion to low adhesion or vice versa;
  • This The subject of the invention is a device and an associated method capable of reproducing the adhesion characteristics of such soils.
  • the simplest solution consists in producing them on such a soil, which requires a partial clearing of a snow-covered road.
  • This solution is technically possible but the tests can only be carried out in winter and on very specific geographical locations.
  • the snow conditions are depending on the outside temperature and the amount of sunshine, which does not guarantee the reproducibility of the test conditions. It is necessary, moreover, to dry the part with high adhesion which poses problems quickly insoluble.
  • Another solution is to carry out tests in which the vehicle rides on a road and a wet grassy field. This solution is also technically acceptable but the rapid degradation of the grassy terrain by rutting and tearing of grass does not allow the realization of tests successively under the same conditions.
  • patent FR2760090 is known. which describes a device capable of reproducing road conditions of adhesion heterogeneous for land vehicle tests and which consists of two parallels whose coating is different, one being constituted by a mix and the other by polished basalt plates or glass blocks spherical caps.
  • the coefficient of adhesion of a tire is about 0.6 to 0.8 for asphalt, 0.3 for basaltin and 0.2 for cobblestones. glasses. It is thus possible to simulate, respectively, a road surface standard, packed snow and ice.
  • the coefficient of adhesion that is to say the ratio, on a wheel, of the effort longitudinal, transverse or compound maximum on the vertical force thus obtained from the side at low adhesion is around 0.2 which is closer to the ice storm than snow, so too low in many cases for representative tests from a snowy or wet grassy ground.
  • the adhesion of the wet track may, as it, to be at best of the order of 0.8, but more generally will be located in the 0.6 to 0.7, which is also too weak to be representative of the maximum possible grip on roads.
  • the object of the invention is to remedy the aforementioned drawbacks by proposing a device capable of reproducing heterogeneous adhesion characteristics of a vehicle and comprising at least two different types of tread and disposed nearby, including one to reproduce the characteristics adhesion of a snow-covered or wet-grass ground and the other to reproduce a strong adherence, this device does not require watering, avoiding a lowering of adhesion by proximity pollution with the lower part adhesion, being able to be used whatever the season and whose high adhesion is not weakened by proximity to the low-adhesion part.
  • the solution provided is a device able to reproduce characteristics heterogeneous adhesion of a vehicle and comprising at least two strips of rolling of different nature and characterized in that the first band comprises a coating on which several layers of spherical elements are arranged, the spherical elements of the upper layers being able to roll the ones by compared to others, while the second band has a coating on which is disposed a so-called draining coating, consisting of first aggregates and with a minimum of 20% communicating voids.
  • this asphalt is studded with second granules of size at least equal to the aggregates of the so-called draining mix.
  • the spherical elements are consisting of microbeads and / or microspheres, preferably of which the size is between 200 and 4000 micrometers and / or the coating comprises roughness on the surface allowing microbeads of the lower layer to housing.
  • the second aggregates of the second band are, at least in part, consisting of aggregates of particle size 10/14 or 10/18.
  • the granulometry of the first aggregates has a discontinuity, the first aggregates of the second band being able, at least in part, consist of aggregates of particle size 0/14 with discontinuity 4/10, or 0/10 with discontinuity 2/6, or 0/6 with discontinuity 2/4.
  • the first and second strips are separated by a separation zone capable of limiting the projection of the balls of the first band towards the second and / or to trap them, this zone possibly comprising a partition and / or a gutter.
  • the invention also relates to a test track of the heterogeneous adhesion of vehicle comprising a device according to the invention and having a longitudinal axis and a transverse axis, characterized in that it comprises transversely, at least a passage from the first band to the second or vice versa and / or longitudinally at least one passage from the first band to the second or vice versa, this track can be at least partly covered.
  • the method comprises an additional step consisting in hot nailing the draining mix with aggregates.
  • FIG. 1 shows a diagram of said first band 1 according to the mode of described embodiment.
  • This band 1 is able to reproduce the characteristics adhesion of a vehicle on snowy ground or covered with wet grass. She is consisting of a coating 3 on which are arranged microbeads 2 on several layers or layers 4, 5, 6. These microbeads are free on the coating and also between them.
  • the coating is made of limestone cement sand whose coefficient of Accelerated polishing is 0.37 and the percentage of cement about 6.5% in mass.
  • This coating is perfectly flat but it has roughnesses whose function is to prevent the training of all the microbeads during the passage of a vehicle.
  • the microbeads 2 are, in this embodiment, all substantially the same diameter, about 1000 micrometers. The quantity is sufficient to ensure a total thickness of the microbeads of 3 to 4mm.
  • the coefficient of adhesion goes from 0.3 to 0.4.
  • FIGS 2a to 2c show diagrams of the second band 10 of device according to this embodiment of the invention.
  • This second strip 10 comprises a coating 11, possibly the same as that of the first band, a tread 12.
  • this tread 12 consists of an asphalt mix draining 13 consisting of aggregates and binders known selected and having the fact of its drainability of many cavities, at least 20% of communicating voids, where can accommodate the microbeads 2 possibly spilled during preparation or the use of the overall device, which avoids a lowering of adhesion;
  • this coated material consists of aggregates 15 of size 0/14 with discontinuity 4/10 (aggregates 16).
  • the chosen binder has a high resistance to tearing.
  • the thickness of the wearing course 12, which should preferably be between 30 and 50 mm, is 45mm.
  • the tread 12 comprises, preferentially, second aggregates on its upper face. These aggregates are attached to the mixture 13 by hot nailing. The size of these second aggregates is greater than that of the aggregates 15, 16 contained in the drainage coating 13, in occurrence 14/18.
  • Figure 3 shows a diagram of the separation zone between the first band 1 and the second 10 according to a particular embodiment.
  • This zone has two partitions 18, whose height is slightly greater than that of the draining mix 13 and one of which is arranged against the first band 1 and the other one against the second band and they are themselves separated by a channel 19 having a grid on its upper part, the meshes of this grid having a size greater than that of the microbeads 2.
  • This gutter 19 is to recover the logs that would be projected towards the second band during the passage of the vehicle.
  • FIG. 4 shows a track 20 comprising a device according to the invention, i.e., a first strip 1 with microbeads and a second strip 10 to high adhesion whose tread is constituted by a coating draining studded with a second larger size granule, namely size 10/14.
  • the track 20 comprises, on one side of the axis, successively a first band 1 able to reproduce the characteristics of a soil snow-covered then a second band 10 highly adherent, while it has a second highly adherent band 10 then a first band 1 and again a highly adherent band 10 on the other side.
  • runway 20 has a first zone with two bands different 1,10, then a second area with the first band 1 and then a third zone with two different bands but whose position is reversed by compared to the first zone, and finally a fourth zone with only one highly adherent band 10.
  • the track could have the a form of disc or a rolling circuit sufficiently wide to be able to perform baffle and bend tests, thus verifying the behavior of curved vehicles.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Structures (AREA)
  • Tires In General (AREA)
  • Steering Devices For Bicycles And Motorcycles (AREA)
  • Automatic Cycles, And Cycles In General (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Vehicle Body Suspensions (AREA)
EP04291724A 2003-07-31 2004-07-08 Vorrichtung zur Wiedergabe der heterogenen Strassenhaftung eines Fahrzeuges Expired - Lifetime EP1502997B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0309416 2003-07-31
FR0309416A FR2858337B1 (fr) 2003-07-31 2003-07-31 Dispositif apte a reproduire les caracteristiques d'adherence heterogene d'un vehicule

Publications (2)

Publication Number Publication Date
EP1502997A1 true EP1502997A1 (de) 2005-02-02
EP1502997B1 EP1502997B1 (de) 2008-08-27

Family

ID=33523025

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04291724A Expired - Lifetime EP1502997B1 (de) 2003-07-31 2004-07-08 Vorrichtung zur Wiedergabe der heterogenen Strassenhaftung eines Fahrzeuges

Country Status (5)

Country Link
EP (1) EP1502997B1 (de)
AT (1) ATE406479T1 (de)
DE (1) DE602004016085D1 (de)
ES (1) ES2309472T3 (de)
FR (1) FR2858337B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008102182A1 (en) * 2007-02-20 2008-08-28 Andreas Stratigakis Controlled grip track
CN107543791A (zh) * 2017-09-11 2018-01-05 南京林业大学 碎石封层中碎石和沥青之间粘结性能的评价方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2760090A1 (fr) * 1997-02-25 1998-08-28 Peugeot Piste d'essai multi-adherence
EP1158096A1 (de) * 2000-05-26 2001-11-28 Etat-Francais représenté par le Délégué Général pour L'Armement Vorrichtung zur Wiedergabe der Strassenhaftung eines Fahrzeuges

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2760090A1 (fr) * 1997-02-25 1998-08-28 Peugeot Piste d'essai multi-adherence
EP1158096A1 (de) * 2000-05-26 2001-11-28 Etat-Francais représenté par le Délégué Général pour L'Armement Vorrichtung zur Wiedergabe der Strassenhaftung eines Fahrzeuges

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008102182A1 (en) * 2007-02-20 2008-08-28 Andreas Stratigakis Controlled grip track
CN107543791A (zh) * 2017-09-11 2018-01-05 南京林业大学 碎石封层中碎石和沥青之间粘结性能的评价方法

Also Published As

Publication number Publication date
ES2309472T3 (es) 2008-12-16
ATE406479T1 (de) 2008-09-15
EP1502997B1 (de) 2008-08-27
DE602004016085D1 (de) 2008-10-09
FR2858337B1 (fr) 2005-10-14
FR2858337A1 (fr) 2005-02-04

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