Experimental Evaluation of Rotational Inertia and Tire Rolling Resistance for a Twin Roller Chassis Dynamometer

2017 ◽  
Author(s):  
Jony Javorski Eckert ◽  
Elvis Bertoti ◽  
Eduardo dos Santos Costa ◽  
Fabio Mazzariol Santiciolli ◽  
Rodrigo Yassuda Yamashita ◽  
...  
Keyword(s):  
Experimental Evaluation ◽  
Rolling Resistance ◽  
Rotational Inertia ◽  
Chassis Dynamometer

scholarly journals Effect of the load of drive axles and high of the curtain on stress-strain properties of the tractor

2007 ◽  
Vol 55 (4) ◽  
pp. 77-88 ◽  
Author(s):  
Tomáš Šmerda ◽  
František Bauer
Keyword(s):  
Experimental Measurement ◽  
Rolling Resistance ◽  
Front Axle ◽  
Load Reduction ◽  
Chassis Dynamometer ◽  
Stress Strain

The goal of the experimental measurement was determination of relation among weight load of the tractor together, hitch height changes and drawbar characteristic. The measurement was realized on chassis dynamometer at MUAF in Brno. The first step consisted of rated speed characteristics measurement in conformity with OECD demands. The drawbar characteristic was measured under two selected gears. Adding 980 kg to the nominal wight of the tractor brought increasing maximal drawbar power and drawbar force together with decreasing of slip. The highest differences were observed during the mesurement of fifth gear shifted. The drawbar force grew up to 18.9% as well as the maximal drawbar power (15.2%). The maximal drawbar power at ninth gear gave 62.8 kW. The hitch height was setting to 0.54 m; 0.64 m and 0.74 m. When the hitch height was set from 0.54 m to 0.74 m the drawbar force an power on front axle was lower by reason of load reduction. As can be noticed from the final drawbar characteristics, both curves are identical up to border of maximal drawbar power. Small differences in the area of the highest slips can be ascribed to the rolling resistance.

Method of estimating the rolling resistance coefficient of vehicle tyre using the roller dynamometer

2020 ◽  
Vol 234 (13) ◽  
pp. 3194-3204
Author(s):  
Adrian Soica ◽  
Adrian Budala ◽  
Vlad Monescu ◽  
Slawomir Sommer ◽  
Wojciech Owczarzak
Keyword(s):  
Rolling Resistance ◽  
Resistance Coefficient ◽  
Test Method ◽  
Test Facility ◽  
Vehicle Speed ◽  
Chassis Dynamometer ◽  
The Past ◽  
Test Conditions ◽  
Resistance Coefficients ◽  
Roll Out

The tendency in the past few years has been to introduce tyres with lower rolling resistance coefficients to the market. This paper presents a mathematical method for determining the rolling resistance coefficients variation depending on the speed. The method uses power balance which results from automobile dynamics while rolling on chassis dynamometer. The rolling resistance coefficients of tyres obtained through ‘drum test method’, for which the rolling resistance coefficients variation is known in terms of vehicle speed, are considered as reference values, while than rolling resistance coefficients of tyres obtained through ‘MAHA roller dynamometer’ using the recorded lost drag power in the roll-out phase on the stand are considered as tested values. The rolling resistance coefficients variation could be determined up to the maximum permissible speed of the tyre, for all wheels trained on the stand and not just for one tyre, as determined in laboratory conditions. The test conditions are similar to those in real road conditions, where the temperature of the environment and wheels cannot be controlled. The values obtained by the authors’ proposed method were compared with the values obtained by the ‘drum test method’. The main contribution of the proposed method is to estimate the rolling resistance coefficients without using a very expensive test facility.

Extraction and identification of fillers and pigments from pyrolyzed rubber and tire samples

1996 ◽  
Vol 54 ◽  
pp. 174-175
Author(s):  
P. Sadhukhan ◽  
J. B. Zimmerman
Keyword(s):  
Zinc Oxide ◽  
Electron Microscope ◽  
Carbon Black ◽  
Natural Rubber ◽  
Transmission Electron Microscope ◽  
Rolling Resistance ◽  
Synthetic Polymers ◽  
Nitrogen Atmosphere ◽  
Transmission Electron ◽  
Curing Agents

Rubber stocks, specially tires, are composed of natural rubber and synthetic polymers and also of several compounding ingredients, such as carbon black, silica, zinc oxide etc. These are generally mixed and vulcanized with additional curing agents, mainly organic in nature, to achieve certain “designing properties” including wear, traction, rolling resistance and handling of tires. Considerable importance is, therefore, attached both by the manufacturers and their competitors to be able to extract, identify and characterize various types of fillers and pigments. Several analytical procedures have been in use to extract, preferentially, these fillers and pigments and subsequently identify and characterize them under a transmission electron microscope.Rubber stocks and tire sections are subjected to heat under nitrogen atmosphere to 550°C for one hour and then cooled under nitrogen to remove polymers, leaving behind carbon black, silica and zinc oxide and 650°C to eliminate carbon blacks, leaving only silica and zinc oxide.

Experimental Evaluation of the Dermoskeleton Concept: Addressing the Soldiers Overload Challenge

2012 ◽  
Author(s):  
Chris Ste-Croix ◽  
David Tack ◽  
Denis Boucher ◽  
Francois Ruel ◽  
Gilles Pageau ◽  
...  
Keyword(s):  
Experimental Evaluation
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