Wyniki wyszukiwania - BazTech

1

Impact of Acceleration Style on Vehicle Emissions and Perspectives for Improvement through Transportation Engineering Solutions

Pečman Jan, Šarkan Branislav, Ližbetinová Lenka, Ľupták Vladimír, Loman Michal, Bartuška Ladislav

Archiwum Motoryzacji

|

2024

|

Vol. 104, nr 2

48--62

EN

Road traffic constitutes a key element of modern life, with many individuals behind the wheel each day. Their driving style, specifically how they accelerate and brake, can significantly influence emissions of harmful substances and air quality. Despite the presence of modern cars equipped to reduce exhaust gas components and other emissions, driving style continues to have a substantial impact on air pollution. In the case of aggressive driving, the influence on fuel consumption and emission generation is substantial. Another aspect is the safety of road traffic, as it has been proven that aggressive driving reduces safety. This article focuses on the results of our recent research regarding vehicle emissions during acceleration. We found that even though modern cars are increasingly environmentally friendly, aggressive driving with them can quickly change the perspective on this issue. While the acceleration of a single vehicle may seem essentially negligible, it is crucial to realize that, especially in urban environments, the number of accelerations of road vehicles as a traffic flow is enormous, particularly during peak traffic hours. Furthermore, there are locations where vehicles must decelerate and accelerate consistently, such as certain types of intersections. The goal of the article is to provide an additional viewpoint on monitoring this trend, this time in combination with the road infrastructure itself, with three examples discussed in the article on how these negative trends can be influenced through modifications to the road infrastructure.

2

Influence of road longitudinal terrain profile on vehicle kinetic energy recovery and mitigation of selected transport negative aspects

Pečman Jan, Stopka Ondrej, Rybicka Iwona, Stopková Mária

Transport Problems

|

2023

|

T. 18, z. 4

125--133

EN

In recent years, environmental aspects of transport have been at the center of attention for research concerning sustainable development. The most discussed topics comprise vehicle emission production and fuel consumption. These are influenced by many variables and factors. In addition to individual vehicle characteristics and attributes, engine performances, exhaust systems, and their overall construction designs, the terrain and road profile itself have a non-negligible effect on emission production. Road profile parameters can increase or decrease the total vehicle consumption if its potential is utilized correctly. This manuscript discusses the options to reduce road vehicle consumption while accelerating where its velocity is decreased and yet again increased when using the longitudinal terrain profile principle. The physical relations for this subject are presented in the manuscript as well. Based on the data and knowledge achieved, the manuscript then addresses several scenarios in which the fuel consumption of the examined vehicle and an occurrence of certain emission types are examined. Lastly, multiple development trends that can positively affect the specified road vehicle’s negative effects on the environment are described. The novel approach of the conducted research consists primarily of the interdisciplinary connection between road transport planning and vehicle traffic study (i.e., negative environmental aspects resulting from road transport can be mitigated not only by assistant devices installed in vehicles, such as catalytic converters, solid particle filters but also by constructing judiciously designed roads).

3

Packaging Waste Research Responding to the Rise of Transport and Logistics Volumes during the Covid-19 Pandemic

Pečman Jan, Vrábel Ján, Mašek Jaroslav, Šedivý Josef, Stopková Mária, Bartuška Ladislav

Archiwum Motoryzacji

|

2023

|

Vol. 101, nr 3

50--66

EN

The management of packaging material and its transport flow, including waste management, has become the focus of attention in recent decades, not least because of the emphasis on the requirements of sustainable development. Due to ever-increasing volume various types of packages, i. e. coming not only from industrial production, transport and trade, where its management is regulated, organized and controlled, but also packaging waste that is generated in households and where this waste ends at best sorted into containers according to material and in the worst case as municipal waste, or it is used as fuel in the incinerator. Author´s team defined the research idea in the direction of packaging waste, coming from online shopping, logistics and shipment distribution. The research was conducted over the year 2021 in the Czech Republic, during the Covid-19 pandemic, when online shopping was on its rise and, for many people, it became as a partly substitute for regular shopping in the future. In regard to an analytical part of the research, specific empirical methods were applied. The research hypothesis is evaluated statistically using a pairwise test. The presentation of the research per se is preceded by a literature review with citations of legislative articles and scientific papers related to the topic discussed. This section is followed by a description of the paradox in terms of online trading. The next part of the article presents the research findings, their summary and related conslusions.

4

Cleanliness test for variable packaging solutions in the automotive supply chain

Pečman Jan, Luptak Vladimir

Archiwum Motoryzacji

|

2021

|

Vol. 91, nr 1

49--62

EN

Technical cleanliness is at the centre of attention in more and more sectors of the automotive industry. Its importance primarily lies in the need to ensure the correct function of components and it is necessary to take into account that impurities can affect the assembly and proper functioning of other components if they are connected together in the working circuit. Requirements for technical cleanliness vary according to the type and function of components and can be divided into two basic areas – chemical cleanliness (for example, lubricant contamination) and particulate cleanliness (particles and fibres). So-called clean production must include all areas up until final assembly – production, assembly, storage, transport and the packaging itself. In process chains, measures are taken to minimise contamination or particle generation to achieve a continuous and controllable standard of cleanliness. A special section is the cleanliness of the cable connectors, which is dealt with in this article. The introduction describes the current state of science and research in this field and then summarises the standard requirements in the automotive environment and the basic possible consequences of connector contamination. This is followed by a case study showing the possibilities of preventing contamination by particles and fibres, including a discussion of the effectiveness of these measures.