scholarly journals Limitations of vehicle movement resistances: rolling resistance

2018 ◽  
Vol 19 (12) ◽  
pp. 256-259
Author(s):  
Piotr Wrzecioniarz ◽  
Wojciech Ambroszko ◽  
Aleksandra Pindel
Keyword(s):  
Rolling Resistance ◽  
Resistance Coefficient ◽  
Rolling Resistance Coefficient ◽  
Vehicle Movement

In the paper limitations and exemplary methods of rolling resistance minimization are described. Changes of value of rolling resistance coefficient during years and values for exemplary rolling pairs are presented. Conclusions about future progress are formulated.

scholarly journals Rolling Resistance Estimation for PCR Tyre Design Using the Finite Element Method

2020 ◽  
Author(s):  
Sutisna Nanang Ali
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Rolling Resistance ◽  
Resistance Coefficient ◽  
Total Force ◽  
Exhaust Gas Emission ◽  
Deformation Force ◽  
Rolling Resistance Coefficient ◽  
Alternative Designs ◽  
Element Method

This study presents rolling resistance estimation in the design process of passenger car radial (PCR) tyre by using finite element method. The rolling resistance coefficient of tyres has been becoming one of main requirements within the regulation in many countries as it is related to the level of allowable exhaust gas emission generated by vehicle. Therefore, the tyre being designed must be digitally simulated using finite element method before the tyre is manufactured to provide a high confident level and avoid unnecessary cost related to failure physical product testing. The simulation firstly computes the deformation of several alternative designs of tyres under certain loading, and then the value of deformation force in each tyre component during deformation took place is calculated. The total force of deformation is considered as energy loss or hysteresis loss resulted in tyre rolling resistance. The experiment was carried out on three different tyre designs: two grooves, three grooves, and four grooves. The four groove tyre design gave the smallest rolling resistance coefficient (RRC). Finally, the simulation was continued to compare different crown radius of the tyres and the result shows that the largest crown radius generates the lowest rolling resistance.

scholarly journals Determination of rolling resistance coefficient based on normal tyre stiffness

2018 ◽  
Vol 327 ◽  
pp. 042093
Author(s):  
S P Rykov ◽  
V N Tarasuyk ◽  
V S Koval ◽  
N I Ovchinnikova ◽  
A I Fedotov ◽  
...  
Keyword(s):  
Rolling Resistance ◽  
Resistance Coefficient ◽  
Rolling Resistance Coefficient

scholarly journals The determination of the rolling resistance coefficient of a passenger vehicle with the use of roller test bench method

2019 ◽  
Vol 254 ◽  
pp. 04007 ◽  
Author(s):  
Bartłomiej Pałasz ◽  
Konrad J. Waluś ◽  
Łukasz Warguła
Keyword(s):  
Energy Consumption ◽  
Experimental Research ◽  
Research Method ◽  
Test Bench ◽  
Rolling Resistance ◽  
Resistance Coefficient ◽  
Laboratory Method ◽  
Passenger Vehicle ◽  
Rolling Resistance Coefficient

Contemporary vehicle are designer to be eco-friendly. One of the factors limiting the energy consumption of driving processes is a low value of the rolling resistance coefficient. The rolling resistance depends on the construction features of a tire, exploitation conditions and the type of surface the car moves on. This article presents the results of experimental research of determining the rolling resistance coefficient with the use of laboratory method of roller test bench. The results presented here are a part of a wider research of determining the rolling resistance coefficient and the influence of research method on its value.

A New Computational Model about Vehicle’s Sliding Resistance Coefficients

2011 ◽  
Vol 228-229 ◽  
pp. 60-65
Author(s):  
Hong Liang Lin ◽  
Qiang Yu ◽  
Xue Li Zhang
Keyword(s):  
Drag Coefficient ◽  
Dynamic Performance ◽  
Great Influence ◽  
Rolling Resistance ◽  
Resistance Coefficient ◽  
Calculation Model ◽  
Air Drag ◽  
Sliding Resistance ◽  
Rolling Resistance Coefficient ◽  
Resistance Coefficients

Vehicle’s sliding resistance mainly includes rolling resistance, air drag resistance and friction within the transmission, wheel bearings and other related components. Among those, rolling resistance and air drag always exist whenever vehicle is running, so they have great influence on vehicle’s dynamic performance and fuel economy. Therefore, it is important to determine vehicle’s rolling resistance coefficient and air drag coefficient quickly and accurately in order to operate vehicle properly and reduce the vehicle’s fuel consumption. Combining theoretical analysis with experimental verification, calculation model based on road coasting test was given by means of least squares principle. And through which vehicle rolling resistance coefficient and air drag coefficient were determined easily. Then by using the test data from some Minibus, the vehicle's rolling resistance coefficient and air drag coefficient are calculated according to established model. The computation result shows that rolling resistance coefficient is a linear function of the speed and the air drag coefficient is constant. Finally, the analysis shows that the calculation model is simple, precise and useful.

scholarly journals The determination of the rolling resistance coefficient of objects equipped with the wheels and suspension system – results of preliminary tests

2019 ◽  
Vol 254 ◽  
pp. 01005 ◽  
Author(s):  
Łukasz Wargula ◽  
Bartosz Wieczorek ◽  
Mateusz Kukla
Keyword(s):  
Moving Objects ◽  
Patent Application ◽  
Rolling Resistance ◽  
Resistance Coefficient ◽  
Suspension System ◽  
Operating Conditions ◽  
Drive Unit ◽  
Mobile Machinery ◽  
Rolling Resistance Coefficient

Rolling resistance coefficient is one of the basic resistance when moving objects. In case of objects not equipped with a motor-driven wheels and suspension system , such as: wheelchairs, mobile machinery chopper, shelving and warehouse trucks all resistances are overcome by the muscle strength of the operator. Research is carried out to limit this phenomenon, however, there is a lack of methods for measuring this parameter in the real operating conditions of devices with a wheels and suspension system without a drive unit. The article presents an innovative method of measuring the rolling resistance coefficient of objects equipped only with the wheels and suspension system accordant with the patent application P.424484 and the developed device for these tests in accordance with patent application P.424483. Additionally, the paper presents the results of preliminary tests on the measurement of pivoting coefficient of a transport truck loaded with a given mass.

Determination of the rolling resistance of roller skis

2016 ◽  
Vol 231 (1) ◽  
pp. 50-56
Author(s):  
Kurt Schindelwig ◽  
Martin Mössner ◽  
Michael Hasler ◽  
Werner Nachbauer
Keyword(s):  
Normal Load ◽  
Rolling Resistance ◽  
Resistance Coefficient ◽  
Equal Opportunities ◽  
Cross Country Skiing ◽  
Cross Country ◽  
Rolling Resistance Coefficient ◽  
Moving Patterns ◽  
Resistance Coefficients

The rolling resistance of skis used in roller skiing competitions should resemble the gliding resistance of cross-country skis to allow specific training and moving patterns for cross-country skiing and to guarantee equal opportunities for athletes in roller ski races. Therefore, the purpose of this work was to develop a portable rolling resistance meter to precisely measure the rolling resistance of roller skis. Measurements were based on recordings of the angular deceleration of a flywheel due to the rolling resistance between a roller ski’s wheel and the flywheel’s steel surface. Rolling resistance coefficients of four roller ski types ranged between 0.019 and 0.025. Measurements of the rolling resistance coefficient showed a precision of 1.26%. Substantial rolling resistance coefficient variations (10%) were observed for wheels of the same type. Furthermore, the rolling resistance coefficient was found to be negatively correlated with normal load or ambient temperature. The proposed rolling resistance meter is appropriate to determine the rolling resistance coefficient of roller skis’ wheels precisely.

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