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Zakład Pojazdów Mechanicznych i Techniki Militarnej

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Rok 2024
Rok 2023
  • Acoustic evaluation of road surfaces using different Close Proximity testing devices
    Publikacja

    - APPLIED ACOUSTICS - Rok 2023

    According to the valid standard, Close Proximity (CPX) method intends to evaluate the influence of road surfaces on traffic noise. Measurements may be carried out with the use of a self-powered vehicle or a special test trailer equipped with testing tyre towed by another vehicle. Two different testing devices took part in the research organized in Poland in order to determine the ranking of road surfaces in terms of acoustic parameters....

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  • ANALIZA CECH HYDRO-AERODYNAMICZNYCH BEZZAŁOGOWEGO POJAZDU NAWODNO-POWIETRZNEGO Z WYKORZYSTANIEM EFEKTU PRZYPOWIERZCHNIOWEGO
    Publikacja

    W artykule przedstawiono problematykę badań dotyczących opracowania demonstratora technologii bezzałogowego pojazdu nawodno-powietrznego z wykorzystaniem efektu przypowierzchniowego. Opisano podstawowe problemy badawcze związane z analizą cech hydro-aerodynamicznych pojazdu. Opisano przedmiot badań, bezzałogowy pojazd nawodno-powietrzny typu USV-UAV-WIG. Opisano metodę badań. Przeprowadzono wstępną analizę osiągów i zachowania...

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  • Modeling the effect of electric vehicles on noise levels in the vicinity of rural road sections
    Publikacja

    - Archives of Civil Engineering - Rok 2023

    Numerous European countries experience a steady increase in the share of electric (EV) and hybrid electric (HEV) vehicles in the traffic stream. These vehicles, often referred to as low- or zero-emission vehicles, significantly reduce air pollution in the road environment. They also have a positive effect on noise levels in city centers and in the surroundings of low-speed roads. Nevertheless, issues related to modeling noise from...

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  • Representativity of ISO test track surface based on controlled pass-by measurements
    Publikacja

    - Rok 2023

    Within the Polish-Norwegian research project ELANORE, a limited Round Robin Test has been performed on four ISO tracks in Northern Europe. The basic objective of the project is to improve the EU directive on labelling of tyres for noise and rolling resistance. This directive is based on the measurement procedures proscribed in the UNECE Reg.117. Measurements on 3 ISO tracks were performed in 2021 and presented at InterNoise 2022....

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Rok 2022
  • The EU Tyre Noise Label: The problem with measuring the noise level of only a few of all tyre variants
    Publikacja

    - Rok 2022

    The STEER project, described in another Inter-Noise 2022 paper, has evaluated the performance of the noise label of the European tyre label. The major finding was that uncertainties of the tyre/road noise measurements were higher than should be accepted. One of the worst uncertainty sources was found to be the common practice to measure only some tyres of all sizes or variants within a tyre line, to save money. Generally, only...

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  • Tyre/road noise measurements on ISO tracks according to the UNECE Regulation 117
    Publikacja

    - Rok 2022

    Within the Polish-Norwegian research project ELANORE, a limited Round Robin Test has been performed on 3 ISO tracks in Northern Europe. The basic objective of the project is to improve the EU directive on labelling of tyres for noise and rolling resistance, and this directive is based on the measurement procedures defined in the UN ECE Reg.117. The same test car, test tyres and measurement equipment as well as personnel were used...

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  • Tyre/road noise measurements on ISO tracks using the modified CPX method
    Publikacja

    - Rok 2022

    Tyre rolling noise test method specified in the UNECE Regulation 117 is directly used in the Tyre Labelling Directive. Noise level specified on EU Tyre Label of each new tyre available on the European market was determined based on vehicle coast-by noise measurements performed on the standard reference road surface proscribed in the ISO 10844:2014. Available data from investigations by the vehicle and tyre industry and results...

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Rok 2021
Rok 2020
Rok 2019
Rok 2018
  • Acoustic lifecycle study of the double-layer porous asphalt on E4 in Huskvarna, Sweden
    Publikacja

    - Rok 2018

    In 2010 a double-layer porous asphalt concrete (DPAC) pavement was constructed on the E4 motorway through the Swedish city Huskvarna. Earlier experience in Sweden indicated that it was feasible to obtain a high initial noise reduction but due to the widespread use of studded tires in winter, clogging and ravelling created losses of around 2 dB per year, with an expected acoustical lifetime of only 3 years. However, the improved...

  • AMUNICJA I JEJ ELABORACJA PRAKTYCZNY PORADNIK NOWE WYDANIE
    Publikacja

    - Rok 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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  • An in-depth look at the tire rubber hardness influence on tire/road noise measurements
    Publikacja

    - Rok 2018

    When assessing the acoustic quality of a road pavement with the close-proximity (CPX) or the on-board sound intensity (OBSI) method, the rubber hardness of the reference tire substantially affects the measurement. Practical experience shows that measurement tires can get significantly harder within a single measurement season. This is why one would like to normalize measurements to a reference rubber hardness. The recently published...

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  • BALISTYKA DLA SNAJPERÓW: PRAKTYCZNY PORADNIK
    Publikacja

    - Rok 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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  • COMPARISON OF NOISE EMISSION OF HCT AND CLASSIC VEHICLE COMBINATIONS FOR TIMBER TRANSPORTATION IN SWEDEN
    Publikacja

    - Rok 2018

    By means of a special simulation tool, the noise emission of a high-capacity heavy vehicle (11 axles) was compared to that of a classic heavy vehicle (a truck-dolly-semitrailer with 8 axles). The two cases are designated “Extended vehicle” versus “Classic vehicle” in this study, having total lengths of 34 and 25 m, respectively. The Classic vehicle represents the most common articulated heavy vehicle configuration for transport...

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  • Decreasing CO2 Emissions By Reducing Tire Rolling Resistance
    Publikacja

    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...

  • Modeling of performance of a AUV vehicle towards limiting the hydro-acoustic field.

    Some results of research devoted to the modeling of a AUV-Stealth vehicle performance towards limiting its hydro-acoustic field are presented in the paper. At the beginning the AUV-Stealth autonomous underwater vehicle concept is described. Then the method of research is introduced. Next the key design drivers of the AUV-Stealth vehicle are presented. Between them are the AUV-Stealth hull form, arrangement of internal spaces,...

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  • Modelling of performance of an AUV stealth vehicle. Design for operation.
    Publikacja

    In the paper some results of research connected with modelling of performance and risk assessment of an AUV stealth vehicle are presented. A general approach to design of the stealth AUV autonomous underwater vehicle under consideration is introduced. The basic stealth characteristics of the AUV stealth vehicle are briefly described. The method of research is introduced. The AUV stealth vehicle concept is presented including the...

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  • Poroelastic Road Surface – a Promising Road Traffic Noise Abatement Solution
    Publikacja

    - Rok 2018

    Road surfaces have a direct impact on the generation of noise by rolling tyres, the main and dominant source of noise of moving vehicles, as well as may affect propagation of noise emitted by all noise sources of a vehicle. Thus there is no doubt that pavement should be considered as one of the major potential road traffic noise abatement measure. Low noise pavements of existing types may in new conditions provide up to 8 dB of...

  • Poroelastic Road Surfaces - State of The Art
    Publikacja

    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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  • SAMOCHÓD SPORTOWY DUOMOTO NAPĘDZANY DWOMA SILNIKAMI SPALINOWYMI

    Przedstawiono zaprojektowany i zbudowany przez zespół czterech dyplomantów Wydziału Mechanicznego Politechniki Gdańskiej samochód sportowy napędzany dwoma silnikami. Jeden z nich umieszczono z przodu pojazdu. Przekazuje on moment obrotowy na koła osi przedniej poprzez zespolony układ napędowy. Drugi silnik, usytuowany ztyłu pojazdu, w identyczny sposób przekazuje moment napędowy na koła osi tylnej....

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  • Temperature influence on tyre/road noise on poroelastic road surface based on laboratory measurements
    Publikacja

    The temperature effect on measured tyre/road noise is very important phenomena as it may lead to significant errors in measurement results due to substantial influence of this parameter on the obtained values. It depends mainly on the particular tyre-road combination. It is different for dense and porous as well as for bituminous and cement concrete pavements. It differs also depending on tested tyre. The correction procedure for...

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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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Rok 2017
  • Accurate rolling resistance Rolling resistance measurements can be influenced by a number of factors

    Tire rolling resistance is one of the most difficult-to-measure parameters of the tire/ pavement interface, especially if road measurements are required. First of all, it is necessary to measure a fairly small force in the system that is heavily loaded by other forces and subjected to many adverse effects causing measurement errors. The second problem is related to the fact that tire rolling resistance depends on many factors,...

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  • Degradation of reference tyres used for CPX measurements

    Measurements of tyre/road noise using the Close Proximity Method are based on reference tyres that are described in ISO/TS 11819-3. The standard specifies two tyres, namely "P1" and "H1" that should be used during measurements. To be used for measurements each tyre must fulfill certain conditions that are listed in the standard. The conditions are related to the tread pattern depth and rubber hardness. During experiments performed...

  • Modeling of performance of an AUV stealth vehicle. Design for operation.
    Publikacja

    In the paper some results of research connected with modelling of performance and risk assessment of an AUV stealth vehicle are presented. A general approach to design of the stealth AUV autonomous underwater vehicle under consideration is introduced. The basic stealth characteristics of the AUV stealth vehicle are briefly described. The method of research is introduced. The AUV stealth vehicle concept is presented including the...

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  • Modelowanie cech hydromechanicznych dwustanowych bezzałogowych obiektów pływających.
    Publikacja

    W artykule przedstawiono ogólny zarys problematyki związanej z badaniami i projektowaniem dwustanowych bezzałogowych obiektów pływających. Na początku, przedstawiono badania interdyscyplinarne i możliwości wdrożenia efektów badań. następnie scharakteryzowano tak zwane technologie zaawansowane zastosowanie, których jest niezbędne podczas badań i w czasie projektowania dwustanowych bezzałogowych obiektów pływających. Omówiono metodę...

  • Noise related to gas bottles explosions

    Modern industrialized world is in a never ending danger of accidents and catastrophes of technical nature. Some of them may involve fires and explosions of gas storage bottles or containers. Technical University of Gdansk, Poland performed numerous tests where bottles containing acetylene, oxygen, hydrogen, CO2, LPG, LNG or CNG were blown due to excessive temperature caused by fire. Although those experiments were not focused on...

  • Pavement ageing influence on tyre/road noise
    Publikacja

    - Rok 2017

    Road surface should be constructed in a way that ensures safe and comfortable traffic conditions, not only when it is newly paved but also during its entire lifetime. An important factor in the asphalt mixture design process is also the expected pavement durability and stability of pavement properties over time. In many countries, road surface starts to play a significant role in traffic noise reduction actions. Selecting a particular...