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- Bergiers, Anneleen, et al.
(författare)
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Comparison of Rolling Resistance Measuring Equipment : Pilot Study
- 2011
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- This research is part of the MIRIAM project (Models for rolling resistance In Road Infrastructure Asset Management systems), which aims at developing methods for improved control of road transport carbon dioxide (CO2) emissions in order to obtain sustainable and environmental friendly road infrastructure.As a first part of MIRIAM, a “Phase 1” was conducted in 2010-2011. It is planned to start a “Phase 2” in 2012.MIRIAM is divided into five sub-projects. Sub-project number 1 (SP 1) is designated “Measurement methods and surface properties model”, and lead by Ulf Sandberg, VTI. Within SP 1, one of the major tasks is to study various measurement methods and the performance of available measurement equipment for rolling resistance, with a focus on measuring the pavement properties. As part of this task, in 2011 an international experiment was conducted to compare the measurement devices available within the MIRIAM project. This comparison experiment was popularly called “Round Robin Test” (RRT), which is the name used in this report.The RRT was organized from 6 to 10 June 2011 on the test track owned by IFSTTAR in Nantes, France. Three institutes participated with their rolling resistance trailers: BASt, BRRC, and TUG. The practical organization was coordinated by IFSTTAR and the technical organization by BRRC. Texture measurements were performed by BRRC to verify the homogeneity of the test sections. Measurements on drums in laboratories were performed by BASt and TUG with the same tyres as used in the RRT.At a later stage also truck rolling resistance measurements were carried out on a smaller selection of surfaces on the test track in Nantes. However, when this report was written these measurement results were not yet available.This experiment was, as far as the authors are aware, the first time when this type of devices was compared.This report presents the RRT in terms of how it was carried out and the results obtained.
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- Ejsmont, Jerzy A., et al.
(författare)
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Influence of Tread Pattern on Tire/Road Noise
- 1984
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Ingår i: SAE technical paper series. - : Society of Automotive Engineers. - 0148-7191. ; 93:5, s. 632-640
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Tidskriftsartikel (refereegranskat)abstract
- An indoor road-wheel facility at the Technical University of Gdańsk was used to study the noise emission from a variety of tires with different tread patterns. The tires were run both on a smooth steel drum and a drum covered by a replica road surface. All tread patterns were hand-cut to generate several families of simple treads with regular pitch for a systematic study of how groove design influences noise. Most of the observed, tread influenced phenomena could be explained by generation mechanisms such as radial vibrations induced by tread block impact, pocket air pumping and pipe resonances in the grooves. For instance, it was observed that, when speed increases, sooner or later the tread block impact frequency will coincide with the pipe resonance frequency and then generate excessive noise at that speed.
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| 9. |
- Ejsmont, Jerzy, et al.
(författare)
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Comparision of tire rolling resistance measuring methods for different surfaces
- 2024
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Ingår i: International Journal of Automotive Technology. - Seoul : Springer Nature. - 1976-3832 .- 1229-9138.
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Tidskriftsartikel (refereegranskat)abstract
- The rolling resistance of car tires is one of the most important parameters characterizing tires today. This resistance has a very significant contribution to the energy consumption of wheeled vehicles. The climate crisis has forced tire and car manufacturers to place great emphasis on the environmental impact of their products. Paradoxically, the development of electric vehicles has led to an even greater importance of rolling resistance, because in electric vehicles a large part of the influence of grade resistance and inertial resistance has been eliminated due to re-generative braking, which resulted in rolling resistance and air resistance remain as the most important factors. What is more, electric and hybrid vehicles are usually heavier so the rolling resistance is increased accordingly. To optimize tires for rolling resistance, representative test methods must exist. Unfortunately, the current standards for measuring rolling resistance assume that tests are carried out in conditions that are far from real road conditions. This article compares the results of rolling resistance tests conducted in road conditions with the results of laboratory tests conducted on roadwheel facilities. The overview of results shows thatthe results of tests conducted in accordance with ISO and SAE standards on steel drums are very poorly correlated with more objective results of road tests. Significant differences occur both in the Coefficients of Rolling Resistance (CRR) and in the tire ranking. Only covering the drums with replicas of road surfaces leads to a significant improvement in the results obtained.For investigations of rolling resistance in non steady-state conditions, the flat track testing machine (TTF), equipped with asphalt cassettes, is shown to provide measurement data in agreement with the road test data.
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| 10. |
- Ejsmont, Jerzy, et al.
(författare)
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Tyre/road noise reduction by a poroelastic road surface
- 2014
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Ingår i: INTERNOISE 2014 - 43rd International Congress on Noise Control Engineering. - 9780909882037
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Konferensbidrag (refereegranskat)abstract
- Low noise road surfaces of existing types may in favourable cases and in new conditions provide up to 7 dB of noise reduction. For higher noise reductions, innovative solutions must be sought. Poroelastic road surfaces (PERS) may be such a solution, which currently is studied in the EU project PERSUADE. This paper presents results of trials with a PERS version prefabricated by one of the project partners. Tests were made in a laboratory at TUG, where different tyres were tested on drums covered with PERS, and later field tests were made on a local street in Sweden where VTI had constructed a 25 m long trial section. The field tests were made with a CPX trailer from TUG. Both laboratory and field results showed that tyre/road noise reductions of 9-11 dB were achieved compared to a dense asphalt concrete pavement with maximum aggregate size 11 mm. This is the best result so far in the project. At the same time, this PERS, despite being relatively soft, reduces rolling resistance of passenger car tyres to record-low values, which is important for reducing fuel consumption and CO2 emissions. It is concluded that this type of prefabricated poroelastic road surface offers a very efficient way of reducing tyre/road noise, provided current durability problems can be solved.
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