Jerzy Ejsmont - Publications - Bridge of Knowledge

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Year 2023
Year 2022
Year 2021
  • Investigation of Acoustic Properties of Poroelastic Asphalt Mixtures in Laboratory and Field Conditions
    Publication

    - Materials - Year 2021

    Measures for the improvement of acoustic conditions in the vicinity of roads include the construction of pavement structures with low-noise surfaces with optimal macrotexture and the highest possible sound absorption coefficient. Laboratory evaluation of acoustic properties of a designed asphalt mixture before its placement in the pavement is a good solution. Currently, the most popular method for the determination of the sound...

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  • Selected Aspects of Pavement Texture Influence on Tire Rolling Resistance
    Publication

    - Coatings - Year 2021

    Tire rolling resistance has a significant influence on fuel consumption in cars and trucks and on CO2 emissions. Rolling resistance depends on the tire construction, pavement texture and stiffness, as well as environmental and traffic conditions. This article presents a pilot study on the impact of pavement texture on the rolling resistance of passenger car tires. Reasons why Mean Profile Depth is not a good descriptor of pavement...

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Year 2020
Year 2019
  • Engineering method of tire rolling resistance evaluation
    Publication

    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...

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  • Further development of the poroelastic road surface within the new Polish project SEPOR

    Road surfaces have a direct impact on noise generated by rolling tyres, the main and dominant source of noise of moving vehicles. Road surface texture, porosity and stiffness/elasticity govern the pavement contribution to tyre/road noise the most. An experimental PoroElastic Road Surface (PERS) is a wearing course with a high content of interconnected voids (pores) and with an elastic behavior due to the use of small particles...

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  • Low Noise Poroelastic Road Pavements Based On Bituminous Binder
    Publication

    Tire/road noise is the dominant source of traffic noise. It depends both on the tire design and on the characteristics of road pavements as well as on the vehicles’ operating conditions. Due to the fact that conventional (pneumatic) car tires have almost reached the limits of their ability to further reduce their noisiness, it is widely believed that the additional reduction of tire noise will be possible mainly through modifications...

  • Poroelastic Material for Urban Roads Wearing Courses
    Publication

    Conventional road materials used for producing wearing courses of roads are based on mineral aggregate and bituminous or Portland cement binders. The road materials must be optimized for different properties, including skid resistance, durability, rolling resistance and tire/road noise. Unfortunately, it seems that within classic technologies it is very difficult to achieve further reduction of tire/road noise. Innovative porous...

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Year 2018
  • AMUNICJA I JEJ ELABORACJA PRAKTYCZNY PORADNIK NOWE WYDANIE
    Publication

    - Year 2018

    W książce omówiona jest budowa amunicji strzeleckiej, ze szczególnym uwzględnieniem wpływu konstrukcji pocisku na osiągi amunicji. Omówione jest szczegółowo wyposażenie niezbędne do domowej elaboracji amunicji pistoletowej i karabinowej. Przedstawiono zasady doboru komponentów takich jak proch, pociski i spłonki oraz techniki wykonywania poszczególnych czynności związanych z przygotowaniem łusek, doborem typu i ilości prochu...

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  • BALISTYKA DLA SNAJPERÓW: PRAKTYCZNY PORADNIK
    Publication

    - Year 2018

    Jest książka z zakresu balistyki, opracowana dla snajperów, strzelców wyborowych, sportowych strzelców długodystansowych oraz myśliwych. W przystępny sposób przedstawiono w niej zagadnienia związane z balistyką wewnętrzną, zewnętrzną i końcową. Bardzo wnikliwie omówiono również celowniki optyczne, sposoby ich testowania i regulacji. Opisano zasady określania poprawek uwzględniających odległość od celu, położenie i ruch celu oraz...

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  • Decreasing CO2 Emissions By Reducing Tire Rolling Resistance
    Publication

    The first motor vehicle was built by Nicolas Cugnot almost 250 years ago and since then there has been a continuous process of motor vehicles’ improvements, as well as development of new road pavements. The fuel crisis of the 70s of the 20th century made it clear to vehicle builders that measures should be taken to reduce vehicle fuel consumption and it contributed to an increased interest in electric vehicles. Although significant...

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  • INFLUENCE OF TEMPERATURE ON THE TYRE ROLLING RESISTANCE

    Temperature is a very important factor controlling rolling resistance of road vehicle tyres. There are at least three different temperatures that may be considered as important factors controlling thermal conditions of the rolling tyre. The most common measure of the thermal conditions during tyre rolling is ambient air temperature. The other two are: pavement temperature and “tyre” temperature. Tyre temperature is the most difficult...

  • Poroelastic Road Surfaces - State of The Art
    Publication

    - Year 2018

    Poroelastic Road Surfaces (PERS) constitute a specific group of pavements containing a great amount of crumbled rubber. In most cases rubber aggregate constitutes about 20% of the mixture (by weight) and a polyurethane resin is used as a binder. As a result, PERS is characterized by a much higher elasticity than asphalt and a high porosity typical for drainage pavements. Due to this, tire/road noise is greatly reduced and on top...

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  • TIRE/ROAD NOISE AND TIRE ROLLING RESISTANCE ON PROTOTYPE PERS SURFACE

    Poroelastic road surfaces are characterized by low noise of tires running on them.Road pavements of this type are promising solution to problems related to traffic noise in cities and on rural roads. Some technical problems still have to be solved, in particular regarding durability and skid resistance on wet surface. Ongoing and planned works are to contribute to create a quiet, durable and safe road surface, which will become...

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  • Tire/Road Noise On Poroelastic Road Surfaces - Results Of Laboratory Measurements

    Tire/road noise is the most important part of traffic noise for medium and high speed driving both in the case of passenger cars and trucks. The potential to make modification of tires that significantly reduce tire/road noise in nearly over, at least for conventional tires so the only promising action is to improve road pavements. One of the innovative solutions is poroelastic road pavement (PERS) that reduces airflow related...

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Year 2017
Year 2016
  • Experimental validation of the rolling resistance measurement method including updated draft standard
    Publication
    • F. Anfosso-Ledee
    • V. Cerezo
    • R. Karlsson
    • A. Bergiers
    • S. Dauvergne
    • J. Ejsmont
    • L. Goubert
    • H. Lesdos
    • J. Maeck
    • U. Sandberg... and 2 others

    - Year 2016

    The main objective of ROSANNE is the harmonisation and standardisation of the measurement of skid resistance, noise emission and rolling resistance of road pavements. Regarding rolling resistance characterisation, a draft for standardization of a harmonized procedure for classification of road surfaces across Europe has been prepared within WP3 (deliverable 3.5). The procedure deals with the direct measurement on real roads of...

  • INFLUENCE OF LOAD AND INFLATION PRESSURE ON THE TYRE ROLLING RESISTANCE

    Tyre load and inflation pressure are important factors controlling rolling resistance of road vehicles. The article presents results obtained in the Technical University of Gdańsk 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...

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  • INFLUENCE OF MEASURING CONDITIONS ON TYRE/ROAD NOISE
    Publication

    - Year 2016

    A decisive factor for the development of tyres and road surfaces is the ability to conduct representative and reproducible measurements of selected characteristics related to the interaction of tyres and road surfaces. In terms of tyre/road noise measurements in Europe two methods described in ISO/FDIS 11819-2 and ECE Regulation No.117 are used. The latter is compulsory for assigning the tyre noise labels. The methodologies differ...

  • Noise and Rolling Resistance Properties of Various Types of Winter Tyres Compared to Normal Car Tyres
    Publication

    - Year 2016

    To cope with winter weather conditions, potentially including snow and ice, it is common to use winter tyres, or ”all-seasons” tyres assumed to be safe both in summer and winter. In some northern countries, winter tyres are mandatory. Traditionally, it has been assumed that winter tyres are noisier than normal tyres (here called summer tyres) and winter tyres equipped with studs are assumed to be very noisy.This paper presents...

  • Ultra Low Noise Poroelastic Road Surfaces
    Publication

    Noise is one of the most important environmental problems related to road traffic. During the last decades, the noise emitted by the engines and powertrains of vehicles was greatly reduced and tires became a clearly dominant noise source. The article describes the concept of low noise poroelastic road surfaces that are composed of mineral and rubber aggregate bound by polyurethane resin. Those surfaces have a porous structure and...

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  • Wpływ nawierzchni i opon na opór toczenia

    Artykuł porusza zagadnienia wpływu nawierzchni jezdni i konstrukcji opon na jeden z istotnych parametrów opisujących współpracę opony z jezdnią, jakim jest opór toczenia. Artykuł nawiązuje do publikacji, w których omówiony jest wpływ oporu toczenia na zużycie energii przez pojazdy samochodowe oraz przedstawione są w ogólnym zarysie metody badania oporu toczenia opon.

Year 2015
Year 2014
  • Analysis of Rolling Resistance of Tires With Run Flat Insert
    Publication

    - Key Engineering Materials - Year 2014

    Run flat properties are required for tires intended for special applications like military or rescue vehicles. Run-Flat inserts make possible to drive a car or truck, with certain restrictions, also when inflation pressure is very low or non-existing (after tire damage). Rolling resistance of tires rolling the inserts increases considerably in relation to the rolling resistance of properly inflated tires. This paper presents results...

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  • Comparison of road and laboratory measurements of tyre/road noise

    Tyre/road noise is one of the major environmental problems related to road traffic. There are several measuring methods of tyre/road noise that may be carried out on the road (for example Coast-down and Close Proximity Method) or in the laboratory (Drum Method). Road measurements are preferred for evaluations of pavement properties while laboratory methods are mostly used to evaluate tyres. One of the biggest problems associated...

  • HOW EFFICIENT IS NOISE LABELING OF TIRES?
    Publication

    Since 2012 all new tires in Europe must be labeled. The label contains general information about tire performance concerning rolling resistance (that corresponds to fuel economy), noise emission and wet grip (only for passenger car tires). Measurements of noise performance of tires must be performed according to the Annex 3 of the Regulation No 117 of the Economic Commission for Europe of the United Nations. The regulation specifies...

  • LOW NOISE TIRES FOR HYBRID AND ELECTRIC VEHICLES
    Publication

    Low Emission Vehicles that are hybrid and electric cars may benefit from specially designed tires that are optimized for driving conditions typical for such vehicles. It is possible that in the future Low Emission Vehicles, especially passenger cars, will substitute conventional vehicles in all applications, however for the time being they are mostly used in urban and suburban areas. Urban traffic has a rather low demand for grip...

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