Designing a Composite Material for Use in Brake Applications

2005 ◽  
Vol 475-479 ◽  
pp. 1109-1112 ◽  
Author(s):  
Jason Lo
Keyword(s):  
Cast Iron ◽  
Fuel Efficiency ◽  
Temperature Property ◽  
Major Drawback ◽  
Aluminum Composite ◽  
Efficiency Increase ◽  
Brake Application ◽  
Noise Vibration ◽  
Brake Rotors ◽  
Automotive Brake

Traditionally, automotive brake rotors are made with cast iron. Besides having economical advantage, cast iron rotor provides many disadvantages due to its weight, such as reduction in fuel efficiency, increase in green house gas emission, and increase in noise, vibration and hardness. With the development of commercial aluminum composites, composite brake rotors are now manufactured. However, the present commercial composite materials are not specifically made for brake application and there are drawbacks. A major drawback is their poor elevated temperature property. In this paper, the unique properties offered by an aluminum composite for brake application is addressed, and an approach to compensate its properties for brake application is highlighted.

Development of Aluminum Composite Automotive Brake Rotors

2016 ◽  
Author(s):  
Taylor Erva ◽  
Adam Loukus ◽  
Luke Luskin
Keyword(s):  
Aluminum Composite ◽  
Brake Rotors ◽  
Automotive Brake

Assessment of Solar Steam Injection in Gas Turbines

2016 ◽  
Author(s):  
C. Kalathakis ◽  
N. Aretakis ◽  
I. Roumeliotis ◽  
A. Alexiou ◽  
K. Mathioudakis
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Fuel Efficiency ◽  
Thermal Power ◽  
Steam Injection ◽  
Power Production ◽  
Engine Operation ◽  
Efficiency Increase ◽  
Solar Receiver ◽  
Steam Production

The concept of solar steam production for injection in a gas turbine combustion chamber is studied for both nominal and part load engine operation. First, a 5MW single shaft engine is considered which is then retrofitted for solar steam injection using either a tower receiver or a parabolic troughs scheme. Next, solar thermal power is used to augment steam production of an already steam injected single shaft engine without any modification of the existing HRSG by placing the solar receiver/evaporator in parallel with the conventional one. For the case examined in this paper, solar steam injection results to an increase of annual power production (∼15%) and annual fuel efficiency (∼6%) compared to the fuel-only engine. It is also shown that the tower receiver scheme has a more stable behavior throughout the year compared to the troughs scheme that has better performance at summer than at winter. In the case of doubling the steam-to-air ratio of an already steam injected gas turbine through the use of a solar evaporator, annual power production and fuel efficiency increase by 5% and 2% respectively.

scholarly journals New Priorities in the Environment Protection against Civil Aviation Influence

10.12737/1575 ◽  
2013 ◽  
Vol 2 (5) ◽  
pp. 25-30 ◽  
Author(s):  
Николайкин ◽  
N. Nikolaykin
Keyword(s):  
Alternative Fuels ◽  
Fuel Efficiency ◽  
Civil Aviation ◽  
Environment Protection ◽  
Ecological Requirements ◽  
Aviation Noise ◽  
Noise Impact ◽  
Efficiency Increase

The modern directions of environment protection against aircraft influence in the light of International Civil Aviation Organization (IСAO) decisions have been analyzed. Modern priorities in this activity have been revealed, tendencies of development related to international and civil aviation, as well as evolution of ecological requirements to aircraft, civil aviation’s fuel efficiency increase directions and alternative fuels, problems of aviation noise impact on habitat have been considered.

Free Vibration of Coupled Disk-Hat Structures

1999 ◽  
Author(s):  
Jun-Chul Bae ◽  
Jonathan Wickert
Keyword(s):  
Free Vibration ◽  
Natural Frequencies ◽  
Three Dimensional ◽  
Phase Relationship ◽  
Vibration Modes ◽  
Pure Bending ◽  
Brake Rotors ◽  
Automotive Brake ◽  
Ordered Pairs

Abstract The free vibration of disk-hat structures, such as automotive brake rotors, is investigated analytically and through laboratory experimentation. Of particular interest are the role played by the hat element’s depth in influencing the three-dimensional vibration of the disk, and the manner in which the bending and in-plane modes of the disk alone evolve as a hat of increasing depth is incorporated in the model. The lower vibration modes of disk-hat structures are shown to be characterized by the numbers of nodal circles NC and diameters ND present on the disk, as well as the phase relationship between the disk’s transverse and radial displacements due to coupling with the hat element. Such modes map continuously back to the pure bending and in-plane modes of the disk alone, appear in ordered pairs, and can exist at close frequencies. Those characteristics are explored particularly with respect to sensitivities in the disk’s thickness and the hat’s depth with a view towards shifting particular natural frequencies, or minimizing transverse disk motion in certain vibration modes. Results obtained through analysis and measurement of a prototypical disk-hat structure are applied in a case study with a ventilated automotive brake rotor.

scholarly journals Grey Cast Iron Brake Discs Laser Cladded with Nickel-Tungsten Carbide—Friction, Wear and Airborne Wear Particle Emission

Atmosphere ◽  
2020 ◽  
Vol 11 (6) ◽  
pp. 621 ◽  
Author(s):  
Senad Dizdar ◽  
Yezhe Lyu ◽  
Conny Lampa ◽  
Ulf Olofsson
Keyword(s):  
Cast Iron ◽  
Tungsten Carbide ◽  
Wear Particle ◽  
Particle Emission ◽  
Grey Cast Iron ◽  
Wear Testing ◽  
Particle Analysis ◽  
Brake Disc ◽  
Grey Cast ◽  
Automotive Brake

Airborne wear particle emission has been investigated in a pin-on-disc tribometer equipped with particle analysis equipment. The pins are cut out from commercial powder metallurgy automotive brake pads as with and without copper content. The discs are cut out from a commercial grey cast iron automotive brake disc as cut out and as in addition to a laser cladded with a powder mix of Ni-self fluxing alloy + 60% spheroidized fused tungsten carbide and then fine-ground. Dry sliding wear testing runs under a contact pressure of 0.6 MPa, sliding velocity of 2 m/s and a total sliding distance of 14,400 m. The test results show both wear and particle emission improvement by using laser cladded discs. The laser cladded discs in comparison to the reference grey cast iron discs do not alter pin wear substantially but achieves halved mass loss and quartered specific wear. Comparing in the same way, the friction coefficient increases from 0.5 to 0.6, and the particle number concentration decreases from over 100 to some 70 (1/cm3) and the partition of particles below 7 µm is approximately halved.

AlSi-SiC Composites for Automotive Brake Rotor

2020 ◽  
Vol 835 ◽  
pp. 178-185
Author(s):  
Fatma Firouz ◽  
Atef Daoud ◽  
Malak Abou El-Khair
Keyword(s):  
Solution Treatment ◽  
Stir Casting ◽  
Primary Phase ◽  
Casting Method ◽  
Sic Particles ◽  
Brake Rotor ◽  
Eutectic Si ◽  
Sic Composites ◽  
Brake Rotors ◽  
Automotive Brake

This manuscript investigates the Fabrication and Microstructure of Automotive Brake Rotor Made of AlSi-SiC Composites. This work is oriented toward fabrication of automotive brake rotors from Al-9Si and Al-12Si reinforced with 10 and 20% SiC particles using stir-casting method. The brake rotors were subjected to heat treatment. Aging behavior showed that hardness increased with the addition of SiC reinforcements by 104%, comparing to solution treatment condition. Also, the addition of SiC particles accelerates formation of precipitates. Microstructure of brake rotors made of composite revealed uniform distribution of SiC particles, primary phase (⍺-Al) and modified eutectic Si. EDX analysis showed the presence of Al, Mg and O at the interface between matrix and SiC particles.

ANALYSIS OF THE HARDNESS OF A SELECTED GROUP OF CAST IRON BRAKE ROTORS

Tribologia ◽  
2017 ◽  
Vol 276 (6) ◽  
pp. 27-31
Author(s):  
Grzegorz KINAL ◽  
Michał LIBERA
Keyword(s):  
Mechanical Properties ◽  
Cast Iron ◽  
Friction Pair ◽  
Brake Pad ◽  
Average Hardness ◽  
Working Surface ◽  
Brake Rotor ◽  
Braking Process ◽  
Brake Rotors

The paper discusses the problems related to cast iron brake rotors in the context of their hardness, which is one of the fundamental mechanical properties of these components. This property fundamentally determines the resistance to the wear processes occurring at the contact of the working surface of the rotor with the brake pad. In order to ensure a proper braking process, the manufacturer must appropriately select the friction pair in terms of the hardness of the mating components and guarantee the constant hardness of each and every manufactured brake rotor. The research presented in the paper was conducted on a selected group of brake rotors. The average hardness of the investigated group of a given type and given manufacturer was ascertained by calculating the spread of the hardness results and checking whether the differences (and what type of differences) occur for newly manufactured and retailed rotors.

Squeal and Thermal Analysis of Automobile Disc Brake Rotors

2015 ◽  
Vol 764-765 ◽  
pp. 369-373
Author(s):  
Wei Hsin Gau ◽  
Kun Nan Chen ◽  
Chin Yuan Hung
Keyword(s):  
Heat Transfer ◽  
Thermal Analysis ◽  
Finite Element ◽  
Aluminum Alloy ◽  
Cast Iron ◽  
Cfd Simulation ◽  
Transfer Coefficients ◽  
Element Analysis ◽  
Heat Transfer Coefficients ◽  
Brake Rotors

The brakes of an automobile are among the most critical components regarding the safety features, and disc brakes are the most common type used in passenger vehicles. In this research, the squeal phenomena of a swirl-vent brake rotor and the thermal analysis of two straight-vent brake rotors, made of cast-iron and aluminum-alloy, are investigated. For the squeal analysis, finite element models are created and analyzed using a prestressed modal analysis with complex eigen-solutions. For the thermal analysis, heat transfer coefficients on the surfaces of a rotor as functions of time are first estimated by CFD simulation, and then imported to a thermal analysis program as the boundary condition. Finally, the temperature distribution of the rotor can be calculated by finite element analysis. The simulation results show that vortices will arise in the vented passages of straight-vent rotors, which means less heat carried away and lower heat transfer coefficients. The swirl-vent brake design is clearly better for thermal ventilation. Furthermore, under the same condition, aluminum-alloy rotors exhibit more uniform temperature distributions with smaller temperature gradients than cast-iron rotors do.

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