Mariam-Webster: 2.11.5 Matrix can be used set of conditions and we can summarise our analogy of the three leg – – table above as follows for a wet runway case: Wet Runway Minimum Friction Level Slippery when wet Hydroplaning potential – – – 1. leg 2. leg 3. leg Geometry Makro texture Skid resistance Drainage flow by gravity Drainage flow by gravity and Drainage/Penetration of thin – forced flow at tyre/pavement water film on aggregates interface Known and managed Historic research on Previous harmonisation technology for NASA grease smear experiments has not measurements. method (MTD). provided desired precision. Defects (ponding) easily CEN standard exist for Uncertainty needs to be detectable by the eye. (MTD) managed and ISO standards exist for A series of EN standards Established relationship management. exist for aggregates between the two methods but not universally France has developed a agreed. system managing uncertainty using a ISO standards exist for reference device. continuous profile measurement (MPD) A competency management system developed by STAC is proposed. Challenge No special challenge Decide upon standards to No stable reference. be used. CEN, ISO EN standards exist Devices not time stable Relationship between Managing uncertainty MTD and MPD is device Uncertainty still not at a type dependent desired level of precision. Shape of aggregates Competency operators Compare across various runways.
Mariam-Webster: 2.11.5 Matrix can be used – set of conditions – and we can summarise our analogy of the three leg table above as follows for a wet runway case: Wet Runway – Minimum Friction Level – Slippery when wet – Hydroplaning potential 1. leg 2. leg 3. leg Geometry Makro texture Skid resistance Drainage – flow by gravity Drainage flow by gravity and forced flow at tyre/pavement interface Drainage/Penetration of thin water film on aggregates Known and managed technology for measurements. Defects (ponding) easily detectable by the eye. A series of EN standards exist for aggregates Historic research on NASA grease smear method (MTD). CEN standard exist for (MTD) Established relationship between the two methods but not universally agreed. ISO standards exist for continuous profile measurement (MPD) Previous harmonisation experiments has not provided desired precision. Uncertainty needs to be managed and ISO standards exist for management. France has developed a system managing uncertainty using a reference device. A competency management system developed by STAC is proposed. Challenge No special challenge EN standards exist Decide upon standards to be used. CEN, ISO Relationship between MTD and MPD is device type dependent Shape of aggregates No stable reference. Devices not time stable Managing uncertainty Uncertainty still not at a desired level of precision. Competency operators Compare across various runways.
MFL_Information_Paper_(Armann_Norheim_FTF).docx