Ulf Sandberg


Bild på Ulf Sandberg

Ulfs forskningsresultat


Status of the EU-project ROSANNE

ROSANNE is a collaborative project in the Seventh EU Framework Programme which aims at developing/harmonising measurement methods for skid resistance, noise emission and rolling resistance of road pavements as a preparation for standardization. To...

Noise and rolling resistance properties of various types of winter tyres compared to...

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. It is commonly...

Improving the CPX method by specifying reference tyres and including corrections for...

Recently completed work in the EU project ROSANNE and in working group ISO/TC43/SC1/WG33 has allowed substantial improvements to measurements made by the Close-Proximity (CPX) method, intended for measurement of noise properties of road surfaces....

ROSANNE project

ROSANNE is a collaborative project in the 7th EU Framework Program which aims at harmonizing measurement methods for skid resistance, noise emission and rolling resistance of road pavements as a preparation for standardization. The project started...

Development of the ultra low noise poroelastic road surface

A poroelastic road surface (PERS) consists of rubber granulates and stone aggregates, bound with an elastic resin, such as polyurethane. It does not contain bitumen. Thanks to its elasticity, porosity and texture, it is capable of yielding an...

Speed dependency of temperature effects on road traffic noise

Recently, a new literature review on the influence of temperature on tire/road noise became available, based on a compilation of large amounts of data from empirical research. This review showed that the effect of temperature is roughly double of...

Reduction of noise and rolling resistance by horizontal grinding of asphalt pavements

Grinding of cement concrete pavements to reduce unevenness and noise is common since a long time. Grinding is then made with wheels equipped with diamond blades rotating in the vertical plane. This creates narrow vertical/longitudinal grooves in the...

Standardized corrections for temperature influence on tire/road noise

Air, tire and road temperatures substantially affect tire/road noise emission. For measuring purposes one would like to normalize measurements to a reference temperature of (say) 20 oC. This paper describes and examines the semi-generic temperature...

The best porous asphalt pavement in Sweden so far

In 2010 a double-layer porous asphalt concrete (DPAC) pavement was constructed in various versions on the E4 motorway through the Swedish city Huskvarna. As a result of a court decision the Swedish Transport Administration had to reduce noise...

Tyre/road noise reduction by a poroelastic road surface

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,...

Relation between tyre/road noise and ice snow friction of winter tyres

It is often assumed that low noise emission from car tyres implies a sacrifice of frictional properties. This study explores the relation between tyre/road noise with friction coefficients on ice and snow surfaces for a number of winter tyres,...

Rolling resistance

MIRIAM has established a sub-project (SP), designated SP 1, to deal with measurement methods for rolling resistance and related issues. This subject forms the most fundamental basis for the MIRIAM ambition to consider rolling resistance in pavement...

Optimization of thin asphalt layers, OPTHINAL. Final report

ERA-NET ROAD initiated a transnational research project titled "Optimization of thin asphalt layers". Thin asphalt layers have been used extensively and with promising results for more than 15 years in several countries in Europe and abroad. They...

Optimization of thin asphalt layers

ERA-NET ROAD initiated a transnational research project titled "Optimization of thin asphalt layers". The DRI-BRRC-VTI Consortium was trusted with carrying out the project and began with a State-of-the-Art report covering, among other things, a...

Project PERSUADE

The paper gives a presentation of the Work Package 2 "Mixture optimization" of the European project PERSUADE; a project which aims at developing poroelastic road surfaces (PERS). The latter are assumed to provide a pavement material that provides...

PERSUADE

The PERSUADE (PoroElastic Road SUrface for Avoiding Damage to the Environment) project started as an EU funded project aiming at further development of the poroelastic road surface (PERS). It has been shown in previous experiments in Sweden and...

The PERSUADE project

Within the noise-abating action plans emanating from the European Noise Directive, there is much need for effective and efficient measures to abate traffic noise. In September 2009, the EC-funded project PERSUADE was started with a view to...

Asphalt rubber pavements in Sweden

Asphalt rubber (AR) pavements of the type which is commonly used in Arizona have been adapted for the Swedish climate and conditions. Both a gap-graded and an open-graded version have been constructed at several places and with a few different...

A study of the history of traffic noise in a large city

With the development of mechanized civilization, transportation of goods and people has become fast and convenient, at the expense of transportation noise which has become a serious problem. This paper aims at comparing the acoustical environment of...

Effect of tyre wear on noise emission and rolling resistance

During a lifecycle a tyre undergoes degradations due to mechanical wear and chemical ageing which affect not only durability and safety but also tyre/road noise emission and rolling resistance. This paper presents a study with the purpose to study...

The selection of new reference test tyres for use with the CPX method, to be specified in...

The draft for ISO standard ISO 11819-2:2000 for CPX tyre/road noise measurements includes specifications for a set of four standard reference test tyres. These commercially available tyres were selected to cover the different mechanisms responsible...

The composite wheel

The Composite Wheel (CW) is an invention by a Swedish engineer which was tested by VTI in a first version in 1989. The CW is a tire/wheel construction with a rubber tread mounted on a belt supported by a self-supporting structure (plate and...

The influence of tyre wear and ageing on tyre/road noise emission and rolling resistance

Most published tyre/road noise tests have been made on new or nearly new tyres. Tyre testing with reference to the EU Directive 2001/43/EC or the ECE Regulation 117 is always made on brand new, albeit run-in, tyres. Reference tyres for road surface...

Possibilities to replace outdoor coast-by tyre/road noise measurements with laboratory...

In subproject C of the SILENCE project there is a task to study possibilities to replace some coast-by measurements made outdoors with either CPX measurements (also made outdoors) or laboratory drum measurements. This report is a background document...

Improving the mechanical properties of a low noise section

The goal of this innovation initiated in a later phase of NR2C WP2 activities was to evaluate (and eventually to improve) the functional and the mechanical properties (durability) of low-noise poroelastic layers built on cement concrete blocks....

Noise classification methods for urban road surfaces

Subproject F of the SILENCE project is concerned with the role of road surfaces in the generation of road traffic noise. The project focuses especially on noise abatement in urban areas, and consequently urban road surfaces and their noise emission...

Effekter av vinterdäck

Valet av vinterdäck har, från att i huvudsak varit en fråga om trafiksäkerhet och slitage av vägar under senare år även kommit att handla om negativa effekter av de inandningsbara partiklar som bildas då dubbdäck sliter på vägbanan och de effekter...

Report of promising new road surfaces for testing

SILENCE aims at developing an integrated system of methodologies and technologies for an efficient control of urban traffic noise. "Integrated system" means the combined consideration of city authorities, individual traffic (on road) and mass...

Source modelling of road vehicles

The state-of-the-art of acoustic source modelling of road vehicles has been reviewed. Extensive measurements and simulations have been carried out. The aim has been to identify and quantify all relevant parameters influencing the noise emission of...

Åtgärder på det kommunala vägnätet i fem tätorter

By commission of the Mälardalen Region of the Swedish National RoadAdministration, the SwedishRoad and Transport Research Institute (VTI) studied the effect ofimprovements to streets in fivetowns. The effects studied related to safety,...

Demoprojekt Region Mälardalen

Statens väg- och transportforskningsinstitut (VTI) har studerat effekten av vidtagna åtgärder på gatunätet i fem stycken tätorter. De effekter som studerats har varit säkerheten, framkomligheten och miljöpåverkan (som effekt av gas-, partikel- och...

Vägytans inverkan på trafikbulleremissionen

Vägtrafikbullret påverkas i hög grad av typen av vägbeläggning samtkonditionen hos denna.Skillnaden mellan ”bästa” och ”sämsta” fall kan vara upp till 10 dB(A). Ensådan skillnadmotsvarar en tiofaldig ökning eller minskning av trafikvolymen om...

Tyre/road noise

At this conference, the subject of tyre/road noise is on the agenda to a greater extent than ever before. This paper aims at giving an insight into the past, present and future of tyre/road noise emission in the society as well as its control. This...

Noise emission, friction and rolling resistance of car tires

Car tires are supposed to be constructed for safe,economical, pleasant and environmentally friendlydriving. Three performance measures that would quitewell represent the major operational characteristics oftires within the mentioned topics would...

Influence of road surface texture on traffic characteristics related to environment,...

Surface texture is the most important feature of the road surface, affecting tyre/road interaction processes such as friction, tyre wear, exterior vehicle noise emission, interior vehicle noise emission, light reflection and rolling resistance. It...

Road surface influence on tire/road noise

The importance of tire/road noise as part of total vehicle noise has recently received growing attention. It has been recognized as a major component of passenger car noise, even at moderate speeds, and as a significant component of truck noise at...