SAE J1269 is a standard test defined by the Society of Automotive Engineers[1] to measure the rolling resistance of tires under conditions of thermal equilibrium.[2][3] SAE J2452 is an alternative procedure for measuring rolling resistance under conditions similar to a vehicle coastdown event, where the tire is in a roughly isothermal condition (but not thermal equilibrium).
The rolling resistance coefficient (RRC) thus measured indicates the proportion of energy that is lost to the hysteresis of the material as the tire rolls.
References
[edit]- ^ "Rolling Resistance Measurement Procedure for Passenger Car, Light Truck, and Highway Truck and Bus Tires J1269_202012". sae.org. SAE. Retrieved 3 February 2024.
- ^ Hall, D. E.; J. C. Moreland (2001). "Fundamentals of Rolling Resistance". Rubber Chemistry and Technology. 74 (3): 525–539. doi:10.5254/1.3547650.
- ^ Mars, W. V.; J. R. Luchini (1999). "An Analytical Model for the Transient Rolling Resistance Behavior of Tires". Tire Science and Technology. 27 (3): 161–175. doi:10.2346/1.2135982.
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction