scholarly journals The method of thermal calculation of automotive disc brake assemblies

2020 ◽  
Vol 17 (4) ◽  
pp. 203-208
Author(s):  
N. V. Holshev ◽  
◽  
A. A. Lavrenchenko ◽  
A. V. Prokhorov ◽  
D. N. Konovalov ◽  
...  
Keyword(s):  
Heat Exchange ◽  
Kinetic Energy ◽  
Heating Temperature ◽  
Disk Surface ◽  
Thermal Calculation ◽  
Brake Disc ◽  
Disc Brake ◽  
Electric Currents ◽  
Brake Pads ◽  
Finite Set

The article describes a method for calculating the heating temperature of the automobile brake disc. The brake disc is considered as a finite set of "cells" located in several layers. In thermal calculation, according to the proposed method, the heating of the disk surface is taken into account not only from the absorption of the vehicle kinetic energy, but also from the generated electric currents that cause micro-explosions between the irregularities of the disk surface and the brake pads. The cooling of the disk during the time between braking due to heat exchange with air is also taken into account. This method provides the ability to calculate the temperature of the brake disc, both on its surface and inside.

scholarly journals Bicycle Disc Brake Thermal Performance: Combining Dynamometer Tests, Bicycle Experiments, and Modeling

Proceedings ◽  
2020 ◽  
Vol 49 (1) ◽  
pp. 100
Author(s):  
Ioan Feier ◽  
Joseph Way ◽  
Rob Redfield
Keyword(s):  
Thermal Model ◽  
Normal Force ◽  
Field Trials ◽  
Brake Disc ◽  
Disc Brake ◽  
Brake Pad ◽  
Brake Pads ◽  
Disc Brakes ◽  
Friction Curve ◽  
Friction Performance

High-power bicycle disc braking can create excessive temperatures and boiling brake fluid, resulting in performance degradation and damage. The goal of this work is to understand brake friction performance and thermal behavior for bicycle disc brakes. A previously described disc braking dynamometer is used to assess brake pad performance of sintered metallic brake pads, organic brake pads, and ‘power’ organic pads in up to 400 W of braking power. The friction coefficient is found to be dependent on both temperature and normal force. Friction curve fits are provided for temperatures between 300 K and 550 K. Organic and ‘power’ organic pads are found to have similar behavior, and have higher friction coefficients compared to metallic pads. Further, brakes on an instrumented bicycle are tested in outdoor field trials during downhill descent. A MATLAB thermal model successfully predicts the downhill field brake disc temperatures when using the friction data curve fits.

The Design of Disc Brake for Mine Hoist in Civil Engineering

2012 ◽  
Vol 568 ◽  
pp. 212-215 ◽  
Author(s):  
Hai Tao Zhang ◽  
Ying Jun Dai ◽  
Yu Jing Jia ◽  
Guang Zhen Cheng
Keyword(s):  
Salt Spray ◽  
Outer Cylinder ◽  
Positive Pressure ◽  
Brake Disc ◽  
Disc Brake ◽  
Brake Pads ◽  
Disc Brakes ◽  
Cylinder Piston ◽  
Set Up ◽  
Mine Hoist

This article will describe the research status and the features of control system of the disc brakes of mine hoist. The disc brakes consist of body, outer cylinder, cylinder, piston, ring, disc springs, plunger, gate disk and other components. The disc brakes use the pre-load of disc springs to force the piston to move towards the brake disc, push the brake pads out, then the brake pads and drum brake disc contact and resulting in positive pressure, then the formation of friction produce a braking torque. When the brake system loose pads, the cylinder is filled with the pressure oil, which make the piston compresses the disc springs, and promote the brake pads to move back and then left brake disc, remove the braking force. The hydraulic circuit of the braking system chooses two-way parallel oil and four oil cylinder brake. A slip road set up a one-way throttle, making the slip road brake slightly delayed, which will achieve two stage braking and make work more stable. This disc brake is normally closed, which means when the hoist does not work, the brake is in the state of braking to prevent the occurrence of accidents. This brake is safe, reliable and sensitive in action. The materials of brake pads is rigid asbestos plastic, which have stable friction coefficient, good wear resistance, is not sensitive to the aqueous medium and salt spray,it has flexible installation location, and it is easy to use, adjust and maintain.

scholarly journals Temperature of the brakes and the Braking Force

2017 ◽  
Vol 5 (1) ◽  
pp. 13-16
Author(s):  
Vladimír Rievaj ◽  
◽  
Lenka Mokričková ◽  
František Synák
Keyword(s):  
Kinetic Energy ◽  
Coefficient Of Friction ◽  
Brake Disc ◽  
Brake Fluid ◽  
Brake Pads ◽  
The Coefficient Of Friction ◽  
Braking Force ◽  
Brake Drum ◽  
Brake Lining ◽  
The Impact

The kinetic energy of the braking vehicle is changed into heat and the resulting heat increases the temperature of each part of brakes. The changed temperature affects the coefficient of friction between the brake lining and brake drum of brake disc. Unless the brakes are actuated hydraulically there is the warning brake pads and brake fluid. Object of examination in this article is the impact of repetitive braking to change of these parameters and the impact of time to change the boiling point of the brake fluid.

Research of Heat Exchange and Losses of Kinetic Energy in the Working Blades with a Large Relative Step

2009 ◽  
Vol 40 (2) ◽  
pp. 179-186
Author(s):  
V. A. Rassokhin ◽  
S. Yu. Olennikov ◽  
E. A. Chirkova ◽  
A. A. Kondratiev ◽  
Yu. V. Matveev
Keyword(s):  
Heat Exchange ◽  
Kinetic Energy ◽  
Working Blades

Numerical Modeling and Simulation Analysis of Temperature Field of Disc Brake on Trains

2011 ◽  
Vol 199-200 ◽  
pp. 1492-1495 ◽  
Author(s):  
Guo Shun Wang ◽  
Rong Fu ◽  
Liang Zhao
Keyword(s):  
Temperature Field ◽  
Temperature Gradient ◽  
High Speed ◽  
Large Scale ◽  
Working Condition ◽  
Constant Speed ◽  
Brake Disc ◽  
Disc Brake ◽  
Brake Pad ◽  
Finite Element Software

The simulation calculation on the temperature field of the disc brake system on high-speed trains under the working condition of constant speed at 50Km/h is made. A steady-state calculation model is established according to the actual geometric size of a brake disc and a brake pad, and the analog calculation and simulation on the temperature field of the brake disc and the brake pad by using the large-scale nonlinear finite element software ABAQUS are carried out. The distribution rules of the temperature field of the brake disc and the brake pad under the working condition of constant speed are made known. The surface temperature of the brake disc at friction radius is the highest, with a band distribution for temperature. There exists a temperature flex point in the direction of thickness, of which the thickness occupies 15% of that of the brake disc; due to the small volume of the brake pad, the temperature gradient of the whole brake pad is not sharp, and larger temperature gradient occurs only on the contact surface.

Brake Wear Particle Size and Shape Analysis of Non-Asbestos Organic (NAO) and Semi Metallic Brake Pad

2014 ◽  
Vol 71 (2) ◽  
Author(s):  
Hussain, S. ◽  
M.K Abdul Hamid ◽  
A.R Mat Lazim ◽  
A.R. Abu Bakar
Keyword(s):  
Particle Size ◽  
Wear Particle ◽  
Brake Disc ◽  
Wear Particles ◽  
Brake Pad ◽  
Brake Pads ◽  
Size And Shape ◽  
Brake Wear Particles ◽  
Brake Wear ◽  
Particle Size And Shape

Brake wear particles resulting from friction between the brake pad and disc are common in brake system. In this work brake wear particles were analyzed based on the size and shape to investigate the effects of speed and load applied to the generation of brake wear particles. Scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDX) was used to identify the size, shape and element compositions of these particles. Two types of brake pads were studied which are non-asbestos organic and semi metallic brake pads. Results showed that the size and shape of the particles generatedvary significantly depending on the applied brake load, and less significantly on brake disc speed. The wear particle becomes bigger with increasing applied brake pressure. The wear particle size varies from 300 nm to 600 µm, and contained elements such as carbon, oxygen, magnesium, aluminum, sulfur and iron.

Tribological Performance of a Non Asbestos Organic Brake Pad Using Various Organic and Mineral Fibers

2012 ◽  
Vol 585 ◽  
pp. 559-563
Author(s):  
M.A. Sai Balaji ◽  
K. Kalaichelvan
Keyword(s):  
Wear Behavior ◽  
Testing Machine ◽  
Brake Disc ◽  
Brake Pads ◽  
Degradation Temperature ◽  
Industrial Standards ◽  
Worn Surface ◽  
Acrylic Fibers ◽  
Automotive Brake

Non-Asbestos organic composite friction materials are increasingly used in automotive brake disc pad applications. The present paper deals with the role of various organic fibers Kevlar, Acrylic fibers and the Rock fiber namely the Lapinus fiber on the fade and recovery behavior of friction composites. Three different friction composites were developed with same formulation varying only the percentage of Kevlar, Acrylic and lapinus fibers within the formulation. The formulations containing 13.5% of these fibers were developed as brake pads and designated as NA01, NA02 and NA03 respectively. The chemical and Mechanical properties are tested as per Indian Industrial standards.. The composites are then tested for the tribo-performance using Chase Testing Machine following SAE J661a standards. The fade µ, recovery µ and wear are significantly influenced by the amount and type of fiber combinations. Also the TGA reveals the degradation temperature of these fibers. Composite NA 03 containing Kevlar and lapinus combination is found to have good tribo performance. Worn surface analysis by SEM has proved to be useful in understanding the wear behavior of the composites.

scholarly journals Assessment of disc brake vibration in rail vehicle operation on the basis of brake stand

2021 ◽  
Vol 23 (2) ◽  
pp. 221-230
Author(s):  
Wojciech Sawczuk ◽  
Agnieszka Merkisz-Guranowska ◽  
Armando-Miguel Rilo Cañás
Keyword(s):  
Mass Distribution ◽  
System Component ◽  
Brake Disc ◽  
Imaging Method ◽  
Disc Brake ◽  
Lever System ◽  
Vehicle Operation ◽  
Lever Mechanism ◽  
The Right ◽  
Vibroacoustic Signals

The scientific aim of the article is to present the relationship between the vibroacoustic signals of the right and left friction pad during braking, depending on the mass distribution, as an element of the lever system. This article presents the results of tests of a railway disc brake in the scope of vibrations generated by pads in various states of wear located on both sides of the brake disc. The tests were carried out on the brake stand using the vibroacoustic method including the analysis of amplitudes and frequencies and the thermal imaging method. Special attention was paid to the analysis of the classic lever mechanism as a multimass system influencing the thermo-mechanical characteristics and vibrations of the pads on the right and left side of the brake disc. Uneven mass distribution of the system translates into uneven wear of the friction components. The scientific aim of this paper is to present the relation between vibroacoustic signals of the right and left friction pad during braking depending on the mass distribution of the lever system component.

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