scholarly journals Identification of factors that differentiate motor vehicles that have experienced wear or failure of brake system components during the warranty service period

2021 ◽  
Vol 23 (3) ◽  
pp. 430-442
Author(s):  
Piotr Sliż ◽  
Ewa Wycinka
Keyword(s):  
Process Analysis ◽  
Brake System ◽  
Motor Vehicles ◽  
Brake Disc ◽  
Passenger Cars ◽  
Ex Post ◽  
Multiple Classification Analysis ◽  
Service Period ◽  
System Components ◽  
Warranty Service

The paper focuses on issues related to selected automotive brakes with the aim of applying the proposed methodology to other structural systems of this type. The main aim of the paper is to identify the factors that differentiate the course of wear and occurrence of a fault in brake system components of passenger cars and light commercial vehicles during the warranty service period. The following methods were used in this study: systematic literature review, process analysis, and descriptive and inferential statistics, including analysis of variance and multiple classification analysis. As a result of an analysis of 295 brake system repairs, six differentiating factors that allowed for ex post analysis of the repairs were identified. An analysis of the interaction of these factors made it possible to distinguish three groups of motor vehicles depending on the cause of failure of the braking system. Based on the data generated in the warranty process, it is possible to determine the factors that differentiate the occurrence of a fault and the course of brake disc and pad wear.

scholarly journals Influence of the Braking System that is Contrary to Legislation on Breaking Characteristics of Passenger Car

2018 ◽  
Vol 14 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Tomáš Skrúcaný ◽  
František Synák ◽  
Štefánia Semanová
Keyword(s):  
Road Traffic ◽  
Negative Impact ◽  
Front Axle ◽  
Brake System ◽  
Motor Vehicles ◽  
Active Safety ◽  
Brake Disc ◽  
Braking System ◽  
Braking Distance ◽  
The Mean

Abstract There are also the vehicles among the other vehicles in road traffic that have been modified without being authorised by their producer. These also include modifications such as structural modifications in the vehicle break system. Besides a brake system of road motor vehicles is one of the main factors influencing the active safety of vehicles. The design of the brake system, its technical condition and additional intervention in its construction may have a positive as well as negative impact on the braking distance length and the value of the mean braking deceleration achieved. The paper focuses on the influence of the brake disc diameter of the front axle on the achieved value of the mean braking deceleration and the braking distance length, while the braking system has been modified for several times without being approved by car manufacturer. The introductory part of the paper describes the braking distance sections and it also explains the term of mean braking deceleration. The following part of the paper deals with the measurement methodology, measuring equipment and the vehicle used during the measurements as well as procedures employed. The results obtained from the measurements are processed and presented in tables and also in graphs for greater clarity. The final part of the paper summarizes and evaluates the measured results. The importance of the paper lies in quantification of the influence of brake discs with different diameters on the vehicle active safety in the case of a particular vehicle.

scholarly journals Key Challenges in the Status Analysis for the Sustainable Urban Mobility Plan in Podgorica, Montenegro

2021 ◽  
Vol 13 (3) ◽  
pp. 1037
Author(s):  
Radoje Vujadinović ◽  
Jelena Šaković Jovanović ◽  
Aljaž Plevnik ◽  
Luka Mladenovič ◽  
Tom Rye
Keyword(s):  
Traffic Accidents ◽  
Road Traffic ◽  
Motor Vehicles ◽  
Urban Mobility ◽  
Passenger Cars ◽  
Study Program ◽  
Wide Range ◽  
The Status ◽  
Sustainable Urban Mobility ◽  
Status Analysis

The paper presents the results of the application of a practical approach for collecting data, which provides a simple, cost efficient, and easily reproducible method that was applied to obtain the necessary data for the status analysis of the Sustainable Urban Mobility Plan (SUMP) for Podgorica, the capital of Montenegro. Important data for the estimation of the existing condition of the traffic system were collected through desk research from the appropriate institutions and organizations. Several surveys and focus group interviews were conducted, in which about 5000 residents of Podgorica participated. In addition to answering questions, residents made numerous suggestions, confirming the correctness of a participatory approach in the new traffic planning paradigm that provides the SUMP with crucial advantages. A manual cordon count of traffic on five bridges for the traffic of the motor vehicles, as well as on two pedestrian-only bridges, was performed by students from the study program Road Traffic, and there are plans to repeat this in the coming years in order to enable more reliable monitoring and evaluation of the obtained data. Contemporary quality management tools such as BYPAD and ParkPAD were also used to assess the status of cycling and parking policy, respectively. It is especially important to emphasize that Podgorica is the first city in the West Balkans, and the fourth city in Europe, in which the ParkPAD tool was applied. A wide range of negative phenomena and trends was identified, like a rapid increase in the number of registered vehicles, an increase in the motorization rate and the number of traffic accidents, increased non-compliance with traffic rules, excessive use of passenger cars and auto-taxi vehicles, insufficient use of unattractive public transport, walking and cycling, etc. Based on the data collected, key challenges in status analysis in Podgorica were identified, which the SUMP should try to overcome.

scholarly journals The Development of Strategies to Reduce Exhaust Emissions from Passenger Cars in Rzeszow City—Poland. A Preliminary Assessment of the Results Produced by the Increase of E-Fleet

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1046
Author(s):  
Maksymilian Mądziel ◽  
Tiziana Campisi ◽  
Artur Jaworski ◽  
Giovanni Tesoriere
Keyword(s):  
Particulate Matter ◽  
Electric Vehicles ◽  
Combustion Engine ◽  
Present Report ◽  
Exhaust Emissions ◽  
Motor Vehicles ◽  
Strategic Choices ◽  
Passenger Cars ◽  
Particulate Concentration ◽  
The Impact

Urban agglomerations close to road infrastructure are particularly exposed to harmful exhaust emissions from motor vehicles and this problem is exacerbated at road intersections. Roundabouts are one of the most popular intersection designs in recent years, making traffic flow smoother and safer, but especially at peak times they are subject to numerous stop-and-go operations by vehicles, which increase the dispersion of emissions with high particulate matter rates. The study focused on a specific area of the city of Rzeszow in Poland. This country is characterized by the current composition of vehicle fleets connected to combustion engine vehicles. The measurement of the concentration of particulate matter (PM2.5 and PM10) by means of a preliminary survey campaign in the vicinity of the intersection made it possible to assess the impact of vehicle traffic on the dispersion of pollutants in the air. The present report presents some strategies to be implemented in the examined area considering a comparison of current and project scenarios characterized both by a modification of the road geometry (through the introduction of a turbo roundabout) and the composition of the vehicular flow with the forthcoming diffusion of electric vehicles. The study presents an exemplified methodology for comparing scenarios aimed at optimizing strategic choices for the local administration and also shows the benefits of an increased electric fleet. By processing the data with specific tools and comparing the scenarios, it was found that a conversion of 25% of the motor vehicles to electric vehicles in the current fleet has reduced the concentration of PM10 by about 30% along the ring road, has led to a significant reduction in the length of particulate concentration of the motorway, and it has also led to a significant reduction in the length of the particulate concentration for the access roads to the intersection.

Tribological behavior of laser textured nodular cast iron surface

2019 ◽  
Vol 71 (7) ◽  
pp. 949-955
Author(s):  
Yongmei Zhu ◽  
Junjie Chen ◽  
Jiajun Du ◽  
Yujie Fan ◽  
Jifei Zheng
Keyword(s):  
Cast Iron ◽  
Tribological Behavior ◽  
Surface Texturing ◽  
Nodular Cast Iron ◽  
Area Ratio ◽  
Brake System ◽  
Resin Matrix ◽  
Dry Sliding ◽  
Brake Disc ◽  
Content Type

Purpose Previous publications were mainly focused on the effect of textures under lubrication. Under dry sliding, area ratio of surface texturing (pit area ratio) and diameter of pit affect the tribological behavior. This paper aims to investigate the effect of laser surface texturing on tribological behavior of nodular cast iron under dry sliding. Design/methodology/approach Pit-like textures with different diameters and spaces were fabricated by laser on nodular cast iron (QT600-3). Using nodular cast iron (QT600-3) as the disc specimen and resin matrix composites (UCV018) as the pad specimen, the tribological test was performed with pin-on-disk reciprocating tribo-tester. Findings The coefficient of friction (COF) of the non-textured specimen was larger than that of the textured one. For the same pit diameter, a larger pit area ratio induced a slight decrease of COF, while wear volume decreased significantly. The pit diameter induced a slight decrease of COF as the pit area ratio, but its effect was weaker. Practical implications The experimental studies will help to improve the brake system such as structure modeling of brake disc. Predicting the performance and life of the brake disc in vehicle based on tribological behavior checked in test, it was proved that pit-like texture had application value in vehicle brake system. Originality/value This paper showed that the effect of pit area ratio on friction and wear was greater than that of pit diameter. The experimental results will be useful to the design on safety brake disc.

Coupling Analysis of Frictional Heat under Control of Disc Brake Anti-Skid Brake System

2011 ◽  
Vol 199-200 ◽  
pp. 721-728
Author(s):  
Yi Bing Zhang ◽  
Ying Ying Zhang
Keyword(s):  
Thermal Stress ◽  
Friction Pair ◽  
Brake System ◽  
Frictional Heat ◽  
Brake Disc ◽  
Analysis Model ◽  
Element Analysis ◽  
Study Results ◽  
Friction Temperature ◽  
Braking Force

The nonlinearity of material properties at different temperatures and the manner of braking force applying on a brake system are two key factors to affect the coupling of temperature and thermal stress. Considering these two factors, a finite element analysis model of automobile brake disc and pad is established. By using the model, the dynamic frictional heat and thermal stress of braking friction pair could be simulated and the coupling characters of temperature and thermal stress on friction surfaces could be studied, where the braking force is constant or controlled by an anti-skid brake system(ABS). The study results shown that the friction temperature of brake disk rises in periodic and fluctuant tendency. The fluctuant increase of temperature will influence the character of braking. The increase of friction temperature between a brake disc and pad can decrease under the control of ABS, so the effect of thermo-mechanical coupling could be reduced.

Application of Multicriteria Decision Making to Old Vehicle Elimination in Taiwan

1993 ◽  
Vol 4 (3) ◽  
pp. 268-283 ◽  
Author(s):  
Gwo-Hshiung Tzeng ◽  
Sheng-Hshiung Tsaur
Keyword(s):  
Urban Areas ◽  
Energy Use ◽  
Multicriteria Decision Making ◽  
Motor Vehicles ◽  
Vehicle Safety ◽  
Passenger Cars ◽  
Operation Costs ◽  
Car Exhaust ◽  
Per Capita

As economic development has accelerated and per capita income has increased greatly in recent years in Taiwan, the number of motor vehicles has also increased remarkably. By the end of 1990, the number of passenger cars registered exceeded 2,330,000, and 19% of them have been in use for more than ten years. Judging from these statistics, the average of passenger cars in urban areas has risen. Some of the major negative influences which these old cars have created are outlined below: (a) Environment: air quality is affected by the increased amount of pollutants emitted in car exhaust as the cars age; (b) Energy: As cars age, the efficiency of energy use decreases in fuel consumption and operation costs; (c) Safety: As cars age, the rate of breakdown rises. This leads to more acidents or, at the very least, traffic jams when a car breaks down and obstructs traffic flow, thus increasing social costs. It is, indeed, necessary to get rid of these old cars. In this paper strategies to eliminate old vehicles have been laid out. Three objectives to be achieved are (a) improving the quality of the environment, (b) decreasing energy consumption, and (c) improving vehicle safety. Coordination with the community during government implementation of the strategy will also be taken into consideration.

Thermal analysis of brake system components from low-lift vehicle

2019 ◽  
Vol 12 (4) ◽  
pp. 102
Author(s):  
L. L. Barbosa ◽  
E. Buzzacaro ◽  
R. F. Brito ◽  
C. L. Da Silva ◽  
L. J. Minette ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Brake System ◽  
System Components
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