The influence of the brake pad surface machining and finishing on its friction performance- examined by inertia brake dynamometr testing

The article describes the influence of brake pads surface machining and finishing on their friction characteristics. It shows the methods of machining and finishing of the brake pads surface and their influence on noise emission and performance. It shows the brake dynamometer test results obtained on three brake pads which have three different types of surface modification and their detailed analysis and comparison.

Download Full-text

The analysis of burnishing process influence on disc brake friction characteristics and its influence on vehicle safety- by interia brake dynamometer testing

AUTOBUSY – Technika Eksploatacja Systemy Transportowe ◽

10.24136/atest.2018.100 ◽

2018 ◽

Vol 19 (6) ◽

pp. 393-398

Author(s):

Tomasz Dąbrowski ◽

Dariusz Kurczyński ◽

Piotr Łagowski ◽

Michał Warianek

Keyword(s):

Detailed Analysis ◽

Vehicle Safety ◽

Disc Brake ◽

Test Results ◽

Friction Characteristics ◽

Brake Pads ◽

Burnishing Process ◽

Brake Dynamometer ◽

Dynamometer Test

The article describes the influence of the burnishing process on the disc brake friction characteristics. It shows the importance of brake burnish and how unburnished brake can affect vehicle safety. It shows the brake dynamometer test results obtained on six different brake pads compounds, their detailed analysis and comparison.

Download Full-text

Evaluation of the Effects of Biodiesel on Emission and Performance by Comparing the Results of the NEDC and WLTC

10.20944/preprints201809.0356.v1 ◽

2018 ◽

Author(s):

Tolgahan Kaya ◽

Osman Akın Kutlar ◽

Ozgur Oguz Taskiran

Keyword(s):

Diesel Engine ◽

Substantial Reduction ◽

Nox Emissions ◽

Chassis Dynamometer ◽

Test Bed ◽

Test Cycle ◽

Performance And Emission ◽

And Performance ◽

Emission And Performance ◽

Dynamometer Test

In this paper, the effects of biodiesel on performance and emission of the current and new-coming regulation cycles, namely the New European Driving Cycle (NEDC) and the Worldwide Harmonized Light Vehicles Test Cycle (WLTC), were investigated by conducting tests on a passenger car, Euro-5 Ford Fiesta, equipped with a 1.5-liter diesel engine. In a two-axle chassis dynamometer test bed, NEDC and WLTC were performed with pure diesel and biodiesel-to-diesel blend (30% biodiesel, 70% diesel in volume). A substantial reduction in CO, HC, and PN emissions was observed for both the NEDC and WLTC when biodiesel was used. Besides, it was found that the WLTC has higher load and velocity profile compared to the NEDC. Moreover, lower CO, HC, and PN emissions were observed with B30 fuel under WLTC compared to the NEDC. Nevertheless, slightly higher CO2 and substantially higher NOx emissions were observed for the WLTC compared to the NEDC.

Download Full-text

Establishing a correlation between friction performance and tribolayer formation using engineered mineral fibres

Journal of Tribology ◽

10.1115/1.4049469 ◽

2020 ◽

pp. 1-26

Author(s):

Neomy Zaquen ◽

Desire Tegels ◽

Arno Kerssemakers ◽

Fernao Persoon

Keyword(s):

Test Results ◽

Third Body ◽

Transfer Layer ◽

Friction Behavior ◽

Mineral Fibers ◽

Brake Pads ◽

Friction Performance ◽

Performance Results ◽

The Impact

Abstract This paper relates the friction performance to the tribolayer formation when using engineered mineral fibers in the friction formulation. A non-asbestos organic non-steel copper-free passenger car-disc pad (NAO) non-steel Cu-free PC-DP) formulation is used to investigate the impact of the fibers on the third body formation and its influence on performance and wear. Full scale dynamometer performance (AK-Master) test results show the pronounced effect of the fiber length on the friction performance. While a similar overall coefficient of friction (CoF) of around 0.33 is observed in all 3 cases, more stable friction behavior is observed for the longer fibers , with less variation. This behaviour is even more observed in the fade and high temperature sections. Especially the use of fibre spheres shows quite some unique features over the other tested mineral fibers, especially with respect to pad / disc wear. To understand these differences in performance, the transfer layer and tribolayer on the disc and brake pad are investigated respectively by means of scanning electron microscopy (SEM). Formulations showing excellent performance results so far show the formation of a smooth transfer film on the disc. No grooves are visible and a continuous iron oxide layer is formed at the surface. The tribolayer of the corresponding brake pads nicely shows the formation of a compacted thin layer at the surface. In addition, the importance of mineral fibers in the formulation is highlighted, as they are at the core of the tribolayer formation. This work is a step forward towards understanding the role of mineral fibers in a friction formulation and shows its importance towards reducing non-exhaust emissions.

Download Full-text

Characteristics of Physicians Referred for a Competence Assessment: A Comparison of State Medical Board and Hospital Referred Physicians

Journal of Medical Regulation ◽

10.30770/2572-1852-96.3.8 ◽

2010 ◽

Vol 96 (3) ◽

pp. 8-15 ◽

Cited By ~ 3

Author(s):

Elizabeth S. Grace ◽

Elizabeth J. Korinek ◽

Zung V. Tran

Keyword(s):

Clinical Competence ◽

Competence Assessment ◽

Average Performance ◽

Medical Board ◽

Key Characteristics ◽

Different Types ◽

Specialty Board ◽

And Performance ◽

State Medical Boards ◽

State Medical Board

ABSTRACT This study compares key characteristics and performance of physicians referred to a clinical competence assessment and education program by state medical boards (boards) and hospitals. Physicians referred by boards (400) and by hospitals (102) completed a CPEP clinical competence assessment between July 2002 and June 2010. Key characteristics, self-reported specialty, and average performance rating for each group are reported and compared. Results show that, compared with hospital-referred physicians, board-referred physicians were more likely to be male (75.5% versus 88.3%), older (average age 54.1 versus 50.3 years), and less likely to be currently specialty board certified (80.4% versus 61.8%). On a scale of 1 (best) to 4 (worst), average performance was 2.62 for board referrals and 2.36 for hospital referrals. There were no significant differences between board and hospital referrals in the percentage of physicians who graduated from U.S. and Canadian medical schools. The most common specialties referred differed for boards and hospitals. Conclusion: Characteristics of physicians referred to a clinical competence program by boards and hospitals differ in important respects. The authors consider the potential reasons for these differences and whether boards and hospitals are dealing with different subsets of physicians with different types of performance problems. Further study is warranted.

Download Full-text