The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Jerzy Ejsmont - One of the best experts on this subject based on the ideXlab platform.
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Engineering method of tire Rolling Resistance evaluation
Measurement, 2019Co-Authors: Jerzy Ejsmont, Wojciech OwczarzakAbstract:Abstract Tire Rolling Resistance is one of the most difficult tire parameters to measure. The reason is that for modern tires the force of Rolling Resistance corresponds to 0.5–1% of tire load, thus measurements of very small forces must be performed in a heavily loaded system. This constitutes great problems, especially in road conditions. Laboratory measurements are easier to perform, as the environment may be better controlled, but roadwheel facilities based on outer drums, in general cannot be equipped with real road pavements. Typically they have steel drums or drums covered by replicas at best. This article describes a laboratory method of Rolling Resistance evaluation that may be used in preliminary assessment of road pavements (based on small pavement samples) and tires. The method is based on impact induced tire oscillations and gives good ranking of tires and road pavements related to the energy losses that control Rolling Resistance.
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road texture influence on tyre Rolling Resistance
Road Materials and Pavement Design, 2017Co-Authors: Jerzy Ejsmont, Grzegorz Ronowski, Beata świeczkożurek, S SommerAbstract:Tyre performance, one of the critical factors for vehicle users, is strongly related to the road surface characteristics, most notably to the pavement texture. Phenomena that occur at the tyre/road interface affect tyre friction (skid Resistance), Rolling Resistance, tyre wear and tyre/road noise. This article deals with relationship between surface texture and Rolling Resistance of light and heavy vehicle tyres. Mean profile depth (MPD) is one of the most common descriptors of road surfaces and in many studies it is correlated with Rolling Resistance of tyres. Results of measurements performed by the Technical University of Gdansk show that although the correlation exists, it is not very strong and regression between MPD and Rolling Resistance is not linear. The key reason for this is partial enveloping of the tyre tread interacting with pavement texture. The article presents results of laboratory and road measurements of Rolling Resistance performed on road surfaces characterised by MPD from 0.20 up to ...
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Tyre Rolling Resistance and its influence on fuel consumption
Combustion Engines, 2017Co-Authors: Beata Świeczko-Żurek, Grzegorz Ronowski, Jerzy EjsmontAbstract:Rolling Resistance of tyres is one of the major resistive forces acting on any wheeled vehicle. Unfortunately, it is also one of the forces very difficult to measure. It is estimated that in certain traffic conditions (like for example constant speed driving with slow or moderate speed) so called Rolling Resistance Impact Factor may be as high as 0.3. This means that reduction of Rolling Resistance by 50% would lead to 15% of energy savings. The paper presents road measuring method of tyre Rolling Resistance and unique equipment used by the Technical University of Gdansk designed to perform measurements of passenger car tyres. It also discusses road pavement, tyre and environmental conditions influence on Rolling Resistance. Also selected data describing current situation related to Rolling Resistance on different road pavements and Rolling Resistance of modern passenger car tyres including tyres specially designed for electric and hybrid vehicles are presented.
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Influence of load and inflation pressure on the tyre Rolling Resistance
International Journal of Automotive Technology, 2016Co-Authors: Jerzy Ejsmont, Grzegorz Ronowski, Stanisław Taryma, Beata Swieczko-zurekAbstract:Tyre load and inflation pressure are important factors contRolling Rolling Resistance of road vehicles. The article presents results obtained in the Technical University of Gdansk during laboratory and road measurements of different car tyres Rolling on different pavements. The knowledge of Rolling Resistance characteristics is important for modelling car dynamics as well as fuel consumption. It is also necessary to establish proper test conditions in the future standardized on-road method of measuring Rolling Resistance. The results indicate that while an increase of load always leads to the increase of Rolling Resistance force, the influence on Coefficient of Rolling Resistance is more complicated and unpredictable. They also indicate that tyres with high Rolling Resistance are more sensitive to inflation pressure changes than low Rolling Resistance tyres.
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The influence of road surface unevenness on tyre Rolling Resistance
2015Co-Authors: Jerzy Ejsmont, Grzegorz Ronowski, Stanisław Taryma, Beata Świeczko-ŻurekAbstract:The geometric characteristics of road surface substantially affect the interaction between tyre and road. Depending on pavement texture wavelength, the texture chiefly affects tyre/road friction, Rolling Resistance, interior and exterior noise, tyre wear, and ride comfort. The article presents results of investigations on the influence of road surface unevenness on the Rolling Resistance of passenger car and truck tyres. The tests were carried out on a roadwheel facility being a part of the test equipment of the Automotive Tyre Testing Laboratory of the Gdansk University of Technology, where a specially made replica road surface with a sinusoidal unevenness profile was mounted on the drum, and on a test road. The unevenness profile under test was characterized by a wavelength of 0.8 m and amplitude of 10 mm, which corresponded to the road surface type commonly referred to as “washboard”. The objective of the experiments was to ascertain whether the increase in Rolling Resistance observed on uneven road surfaces is exclusively caused by an increase in the energy losses in suspension system damping elements or the energy losses in the tyre actually rise as well. The tests revealed that, on the sinusoidal road surface as defined above in comparison with the “Safety Walk” smooth sandpaper like surface, the Rolling Resistance of passenger car tyres grew by about 10 % and Rolling Resistance of truck tyres increased about 30 %.
Grzegorz Ronowski - One of the best experts on this subject based on the ideXlab platform.
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road texture influence on tyre Rolling Resistance
Road Materials and Pavement Design, 2017Co-Authors: Jerzy Ejsmont, Grzegorz Ronowski, Beata świeczkożurek, S SommerAbstract:Tyre performance, one of the critical factors for vehicle users, is strongly related to the road surface characteristics, most notably to the pavement texture. Phenomena that occur at the tyre/road interface affect tyre friction (skid Resistance), Rolling Resistance, tyre wear and tyre/road noise. This article deals with relationship between surface texture and Rolling Resistance of light and heavy vehicle tyres. Mean profile depth (MPD) is one of the most common descriptors of road surfaces and in many studies it is correlated with Rolling Resistance of tyres. Results of measurements performed by the Technical University of Gdansk show that although the correlation exists, it is not very strong and regression between MPD and Rolling Resistance is not linear. The key reason for this is partial enveloping of the tyre tread interacting with pavement texture. The article presents results of laboratory and road measurements of Rolling Resistance performed on road surfaces characterised by MPD from 0.20 up to ...
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Tyre Rolling Resistance and its influence on fuel consumption
Combustion Engines, 2017Co-Authors: Beata Świeczko-Żurek, Grzegorz Ronowski, Jerzy EjsmontAbstract:Rolling Resistance of tyres is one of the major resistive forces acting on any wheeled vehicle. Unfortunately, it is also one of the forces very difficult to measure. It is estimated that in certain traffic conditions (like for example constant speed driving with slow or moderate speed) so called Rolling Resistance Impact Factor may be as high as 0.3. This means that reduction of Rolling Resistance by 50% would lead to 15% of energy savings. The paper presents road measuring method of tyre Rolling Resistance and unique equipment used by the Technical University of Gdansk designed to perform measurements of passenger car tyres. It also discusses road pavement, tyre and environmental conditions influence on Rolling Resistance. Also selected data describing current situation related to Rolling Resistance on different road pavements and Rolling Resistance of modern passenger car tyres including tyres specially designed for electric and hybrid vehicles are presented.
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Influence of load and inflation pressure on the tyre Rolling Resistance
International Journal of Automotive Technology, 2016Co-Authors: Jerzy Ejsmont, Grzegorz Ronowski, Stanisław Taryma, Beata Swieczko-zurekAbstract:Tyre load and inflation pressure are important factors contRolling Rolling Resistance of road vehicles. The article presents results obtained in the Technical University of Gdansk during laboratory and road measurements of different car tyres Rolling on different pavements. The knowledge of Rolling Resistance characteristics is important for modelling car dynamics as well as fuel consumption. It is also necessary to establish proper test conditions in the future standardized on-road method of measuring Rolling Resistance. The results indicate that while an increase of load always leads to the increase of Rolling Resistance force, the influence on Coefficient of Rolling Resistance is more complicated and unpredictable. They also indicate that tyres with high Rolling Resistance are more sensitive to inflation pressure changes than low Rolling Resistance tyres.
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The influence of road surface unevenness on tyre Rolling Resistance
2015Co-Authors: Jerzy Ejsmont, Grzegorz Ronowski, Stanisław Taryma, Beata Świeczko-ŻurekAbstract:The geometric characteristics of road surface substantially affect the interaction between tyre and road. Depending on pavement texture wavelength, the texture chiefly affects tyre/road friction, Rolling Resistance, interior and exterior noise, tyre wear, and ride comfort. The article presents results of investigations on the influence of road surface unevenness on the Rolling Resistance of passenger car and truck tyres. The tests were carried out on a roadwheel facility being a part of the test equipment of the Automotive Tyre Testing Laboratory of the Gdansk University of Technology, where a specially made replica road surface with a sinusoidal unevenness profile was mounted on the drum, and on a test road. The unevenness profile under test was characterized by a wavelength of 0.8 m and amplitude of 10 mm, which corresponded to the road surface type commonly referred to as “washboard”. The objective of the experiments was to ascertain whether the increase in Rolling Resistance observed on uneven road surfaces is exclusively caused by an increase in the energy losses in suspension system damping elements or the energy losses in the tyre actually rise as well. The tests revealed that, on the sinusoidal road surface as defined above in comparison with the “Safety Walk” smooth sandpaper like surface, the Rolling Resistance of passenger car tyres grew by about 10 % and Rolling Resistance of truck tyres increased about 30 %.
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Final report on noise and Rolling Resistance
2015Co-Authors: Jerzy Ejsmont, Grzegorz Ronowski, Piotr Mioduszewski, Stanisław Taryma, Beata Świeczko-ŻurekAbstract:Work Package 6 deals with environmental impacts of PERS use, including noise and Rolling Resistance. This report covers preliminary noise tests performed in the laboratory and at the road test sites. The obtained results indicate that PERS material reduce noise considerably - up to 12 dB in comparison to SMA16 reference surface. Noise reduction properties are especially visible in the case of factory produced PERS slabs supplied by HET Germany. Noise reduction properties of PERS remained almost unchanged after a 3 months long winter time period. Rolling Resistance is an important factor in vehicles’ fuel consumption as well as emission of CO2 and toxic gases like (NOx, CO). This report covers also Rolling Resistance tests of PERS performed in the laboratory and on the road. The results indicate that PERS material may reduce Rolling Resistance in comparison to road surfaces used as references.
A. Anand - One of the best experts on this subject based on the ideXlab platform.
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Operational Methodologies for Rolling Resistance Evaluation
Geotechnical and Geological Engineering, 2017Co-Authors: T. G. Joseph, Michael Curley, A. AnandAbstract:The Rolling Resistance of materials used for haul road construction and to cap in-pit running surfaces is poorly understood and rarely evaluated in practice. Mine waste materials are frequently used to build and cap haul roads, only supplemented by surface capping where better quality gravel or crush materials are available within local geologic and economic limitations. Rolling Resistance is most often estimated from limited geotechnical publications, made available through mining equipment manufacturer supplemental information whose origin is difficult at best to verify. This paper outlines two methodologies which may be easily employed to evaluate Rolling Resistance for (a) selection of materials prior to road and running surface planning and construction and (b) an ongoing evaluation of haul road performance, such that critical areas may be identified for more frequent road maintenance or re-build. To select appropriate road building materials, a scale laboratory test is outlined which highlights the fact that Rolling Resistance, expressed as a percentage equivalent slope, is independent of haul truck size and hence a material property. It may permit not only the selection of individual materials, but also be used to trial the performance of a composite set of haul road layers’ overall Rolling Resistance performance as subgrade layers become deteriorated. An ongoing field evaluation of Rolling Resistance uses (a) the haul truck as the measurement tool, where each tire is a measurement device, reflected by the load response at the suspension, and (b) a cyclic plate load test to establish the resilient pressure stiffness of the ground surface conditions. The latter indicates the ground deformation, which, when evaluated in parallel to the tire deformation establishing the changing tire–ground contact area, permits the Rolling Resistance to be evaluated. Plotting the Rolling Resistance magnitudes by GPS truck location as a truck moves around the mine site identifies the critical zones requiring maintenance attention on an ongoing real-time basis.
Xiaowen Zhou - One of the best experts on this subject based on the ideXlab platform.
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shear induced anisotropy of granular materials with Rolling Resistance and particle shape effects
International Journal of Solids and Structures, 2018Co-Authors: Shiwei Zhao, Matthew T Evans, Xiaowen ZhouAbstract:Abstract The Rolling Resistance model has been employed in the discrete element modelling in geomechanics, as an alternative computationally efficient approach to capture the Resistance of particle rotation due to irregularity in shape. This paper presents a series of 3D DEM simulations of triaxial compression tests on specimens with Rolling Resistance and non-spherical particles using an in-house code. The non-spherical particle shapes are two kinds of special super-ellipsoids (i.e., superballs and ellipsoids) corresponding to two kinds of typical distortion in shape. A comprehensive comparison between the Rolling Resistance and particle shape effects on shear-induced fabric variation and anisotropy within granular materials is carried out. The simulations show that the manners in which quantifiers of fabric and anisotropy approach their respective critical state values vary with shear strain levels. Using the Rolling Resistance model can reproduce the main features of shear-induced fabric variation and anisotropy for most of these fabric measures. However, the effect of particle shape with just slight distortion from sphere can be captured well by the Rolling Resistance model. Moreover, high shear strengths can be achieved with sufficiently strong Rolling Resistance, but this is not recommended due to the unrealistic induced fabric. These findings highlight that the Rolling Resistance model should be carefully used in investigations, especially for micro-macro bridging.
Beata Świeczko-Żurek - One of the best experts on this subject based on the ideXlab platform.
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Tyre Rolling Resistance and its influence on fuel consumption
Combustion Engines, 2017Co-Authors: Beata Świeczko-Żurek, Grzegorz Ronowski, Jerzy EjsmontAbstract:Rolling Resistance of tyres is one of the major resistive forces acting on any wheeled vehicle. Unfortunately, it is also one of the forces very difficult to measure. It is estimated that in certain traffic conditions (like for example constant speed driving with slow or moderate speed) so called Rolling Resistance Impact Factor may be as high as 0.3. This means that reduction of Rolling Resistance by 50% would lead to 15% of energy savings. The paper presents road measuring method of tyre Rolling Resistance and unique equipment used by the Technical University of Gdansk designed to perform measurements of passenger car tyres. It also discusses road pavement, tyre and environmental conditions influence on Rolling Resistance. Also selected data describing current situation related to Rolling Resistance on different road pavements and Rolling Resistance of modern passenger car tyres including tyres specially designed for electric and hybrid vehicles are presented.
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The influence of road surface unevenness on tyre Rolling Resistance
2015Co-Authors: Jerzy Ejsmont, Grzegorz Ronowski, Stanisław Taryma, Beata Świeczko-ŻurekAbstract:The geometric characteristics of road surface substantially affect the interaction between tyre and road. Depending on pavement texture wavelength, the texture chiefly affects tyre/road friction, Rolling Resistance, interior and exterior noise, tyre wear, and ride comfort. The article presents results of investigations on the influence of road surface unevenness on the Rolling Resistance of passenger car and truck tyres. The tests were carried out on a roadwheel facility being a part of the test equipment of the Automotive Tyre Testing Laboratory of the Gdansk University of Technology, where a specially made replica road surface with a sinusoidal unevenness profile was mounted on the drum, and on a test road. The unevenness profile under test was characterized by a wavelength of 0.8 m and amplitude of 10 mm, which corresponded to the road surface type commonly referred to as “washboard”. The objective of the experiments was to ascertain whether the increase in Rolling Resistance observed on uneven road surfaces is exclusively caused by an increase in the energy losses in suspension system damping elements or the energy losses in the tyre actually rise as well. The tests revealed that, on the sinusoidal road surface as defined above in comparison with the “Safety Walk” smooth sandpaper like surface, the Rolling Resistance of passenger car tyres grew by about 10 % and Rolling Resistance of truck tyres increased about 30 %.
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Final report on noise and Rolling Resistance
2015Co-Authors: Jerzy Ejsmont, Grzegorz Ronowski, Piotr Mioduszewski, Stanisław Taryma, Beata Świeczko-ŻurekAbstract:Work Package 6 deals with environmental impacts of PERS use, including noise and Rolling Resistance. This report covers preliminary noise tests performed in the laboratory and at the road test sites. The obtained results indicate that PERS material reduce noise considerably - up to 12 dB in comparison to SMA16 reference surface. Noise reduction properties are especially visible in the case of factory produced PERS slabs supplied by HET Germany. Noise reduction properties of PERS remained almost unchanged after a 3 months long winter time period. Rolling Resistance is an important factor in vehicles’ fuel consumption as well as emission of CO2 and toxic gases like (NOx, CO). This report covers also Rolling Resistance tests of PERS performed in the laboratory and on the road. The results indicate that PERS material may reduce Rolling Resistance in comparison to road surfaces used as references.
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Rolling Resistance Measurements at the MnROAD Facility, Round 2
2014Co-Authors: Jerzy Ejsmont, Grzegorz Ronowski, Beata Świeczko-Żurek, W James WildeAbstract:The Minnesota Department of Transportation and Minnesota State University, Mankato, contracted with the Technical University of Gdansk, in Poland, for a second time to conduct Rolling Resistance at the MnROAD facility near Albertville, Minnesota. Rolling Resistance testing was conducted on most of the cells of the MnROAD mainline and the low-volume road. A relative ranking of Rolling Resistance among the difference surfaces at MnROAD was developed. The research team from Poland conducted the testing for a week in early May 2014. The Rolling Resistance data collected were analyzed and are presented in this report. Additional analyses that were conducted include a relative comparison of fuel consumption predicted with the different Rolling Resistance coefficients measured at MnROAD, with standard concrete and asphalt pavements as references.
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Methods of Tire Rolling Resistance Measurements
2014Co-Authors: Jerzy Ejsmont, Beata Świeczko-ŻurekAbstract:Tire Rolling Resistance is one of the factors related to tire/road interaction that has important influence on road vehicles performance. Raising fuel price and increased concern related to the environmental changes result in growing interest in reduction of tire Rolling Resistance that influences fuel consumption, especially in free-flowing highway traffic with moderate speeds. There are several methods of tire Rolling Resistance measurements. This paper describes them, shows pros and cons of each method and presents relations between results obtained during road and laboratory measurements performed at the Technical University of Gdansk, Poland.
