Aspects Regarding the Braking Capacity of Composite Brake Shoes for Railway Vehicles

2019 ◽  
Vol 56 (1) ◽  
pp. 18-21
Author(s):  
Catalin Cruceanu ◽  
Camil Craciun
Keyword(s):  
Cast Iron ◽  
Composite Materials ◽  
Main Parameter ◽  
Rolling Stock ◽  
Operational Conditions ◽  
Qualitative And Quantitative ◽  
Stopping Distance ◽  
Railway Freight ◽  
Main Target ◽  
Braking Process

The main target of the study is to highlight, by means of numerical simulations, the advantages and possible drawbacks of using composite materials instead of the classical cast iron to equip the brake system of railway freight vehicles. The qualitative and quantitative evaluations refer mainly to the braking capacity by considering as main parameter the stopping distance, in various operational conditions. Results indicate that composite materials are more efficient in the braking process, but in the case of low speeds, the recommendation is to perform earlier and/or stronger braking actions than usual, in classical cast iron equipment on rolling stock.

Research on Composite Materials Used for Brake Shoes Manufacture

2016 ◽  
Vol 254 ◽  
pp. 207-211 ◽  
Author(s):  
Erika Popa ◽  
Liviu Pascu ◽  
Ana Socalici ◽  
Marius Ardelean
Keyword(s):  
Composite Material ◽  
Cast Iron ◽  
Composite Materials ◽  
Carbon Fiber ◽  
Contact Zone ◽  
Laboratory Experiments ◽  
Rolling Stock ◽  
Brake Shoe ◽  
Materials Used

The paper relates laboratory experiments in order to obtain a composite material used for brake shoe manufacture. Regarding the testing materials were processed 38 samples. The percentage and composition of materials are: 15-45% novolac, 1,5-10% hexametyltetramin, 0-8% sulfur, 0-15% carbon fiber, 0-20% graphite, 0-25% aluminum, 15-28% brass and 0-40% rubber. The evolution of tribological and temperature parameters were analyzed in the contact zone tribological testing disk - split pin method. The composite material has the role to replace the classic material (cast iron) used in brake shoes composition in order to reduce the noise caused by rolling stock.

scholarly journals Laboratory Researches Regarding Wear of the Composite Materials for Making Brake Shoes

2017 ◽  
Vol 54 (2) ◽  
pp. 203-206 ◽  
Author(s):  
Erika Ardelean ◽  
Ana Socalici ◽  
Liviu Pascu ◽  
Vasile Putan ◽  
Teodor Heput
Keyword(s):  
Composite Material ◽  
Cast Iron ◽  
Composite Materials ◽  
Experimental Test ◽  
Standard Sample ◽  
Rolling Stock ◽  
Laboratory Conditions

The paper presents the results of the experiments on obtaining a composite material to be used in manufacturing brake shoes for the rolling stock. The aim was to replace the classical material used at present for the manufacturing of brake shoes: cast iron with a specially designed composite material. Six recipes have been tested and compared to a standard sample made of phosphorous cast iron. The wear trials carried out in laboratory conditions on the experimental test rods have led to results that entitle further experiments that implies the manufacturing of brake shoes made of the composite material in question.

Research on RecurDyn Based Simulation Method for the Brake Shoe Eccentric Wear in Railway Freight Cars

2012 ◽  
Vol 522 ◽  
pp. 467-471 ◽  
Author(s):  
Bi Hong Lu ◽  
Yu Zhang ◽  
Bao Zhang Qu ◽  
Jian Song Huang ◽  
Yu Liu
Keyword(s):  
Contact Area ◽  
High Stress ◽  
Great Influence ◽  
Simulation Method ◽  
Dynamics Simulation ◽  
Rolling Stock ◽  
Brake Shoe ◽  
Flexible Coupling ◽  
Railway Freight ◽  
Braking Process

The foundation brake rigging is an important part of the railway freight cars, as it is an actuator of the rolling stock for deceleration and stop to ensure essential device for running safety. The mechanism clearance of the foundation brake rigging has a great influence on the brake shoe eccentric wear in the braking and releasing process. Especially during the braking process, the contact area between the brake shoe and the wheel tread is very small, resulting in the contact area with high stress. Actual operation manifests that on the upper side of the brake shoe wear severely. In order to build and analyze the model of the mechanism with clearance, the foundation brake rigging for the rigid-flexible coupling and multi-body dynamics simulation is carried out with the RecurDyn software, which provides the flexible body analysis module-FFlex. The method of resolving the problem is proposed, which includes the original model format conversion, the model preprocessing, constructing the rigid-flexible coupling dynamics model and analyzing the simulation results, and then providing the theoretical and technical support to improve the foundation brake system for railway freight cars by analyzing the main factors of influencing brake shoe eccentric wear.

scholarly journals Friction and Wear Behaviour of Composite Materials Containing Organic Components

2017 ◽  
Vol 54 (2) ◽  
pp. 269-273 ◽  
Author(s):  
Ana Socalici ◽  
Erika Ardelean ◽  
Liviu Pascu ◽  
Vasile Putan
Keyword(s):  
Composite Material ◽  
Cast Iron ◽  
Composite Materials ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Operating Regime ◽  
Rolling Stock ◽  
Wear Behaviour ◽  
Future Research ◽  
Organic Components

The paper presents the experiments performed in the laboratory and the results obtained on friction and wear behaviour of the composite materials for the manufacture of brake shoes used for driving and towed rolling stock. The tribological research of these samples made of composite material with organic components aimed to determine the influence of certain material factors and operating regime parameters on the tribological properties of the tested samples. The brake shoes made of composite materials oneusesto replace the conventional cast iron brake shoes, to reduce the noise. The future research will focus on finding composite materials with superior properties compared to the currently used ones, and lower costs.

scholarly journals Performance quality analysis of brake iron and composite pads for railway rolling composition

2021 ◽  
pp. 27-37
Author(s):  
E. S. Popov ◽  
O. I. Shinsky
Keyword(s):  
Cast Iron ◽  
Composite Materials ◽  
Carbon Black ◽  
Quality Analysis ◽  
Rolling Stock ◽  
Brake Pads ◽  
Performance Quality ◽  
And Performance ◽  
Railway Rolling Stock

The requirements for the quality and performance of the brake pads of railway rolling stock made of various materials are analyzed. The advantages of cast iron brake pads produced at foundries are shown. The disadvantages of brake pads made of composite materials based on rubber, asbestos, barite, carbon black and other components are noted. Ways to improve standards, specifications and other documentation for these products are proposed.

scholarly journals AGV Brake System Simulation

2019 ◽  
Vol 10 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Daniel Varecha ◽  
Robert Kohar ◽  
Frantisek Brumercik
Keyword(s):  
Mathematical Model ◽  
Input Data ◽  
Initial Conditions ◽  
Brake System ◽  
Disc Brake ◽  
Hydraulic Control ◽  
Stopping Distance ◽  
Braking Force ◽  
Braking Process ◽  
The Mathematical Model

Abstract The article is focused on braking simulation of automated guided vehicle (AGV). The brake system is used with a disc brake and with hydraulic control. In the first step, the formula necessary for braking force at the start of braking is derived. The stopping distance is 1.5 meters. Subsequently, a mathematical model of braking is created into which the formula of the necessary braking force is applied. The mathematical model represents a motion equation that is solved in the software Matlab by an approximation method. Next a simulation is created using Matlab software and the data of simulation are displayed in the graph. The transport speed of the vehicle is 1 〖m.s〗^(-1) and the weight of the vehicle is 6000 kg including load. The aim of this article is to determine the braking time of the device depending from the input data entered, which represent the initial conditions of the braking process.

scholarly journals Using a qualitative and quantitative validation methodology to evaluate a drone detection system

ACTA IMEKO ◽  
2019 ◽  
Vol 8 (4) ◽  
pp. 20
Author(s):  
Daniela Doroftei ◽  
Geert De Cubber
Keyword(s):  
Detection System ◽  
Weather Conditions ◽  
Careful Consideration ◽  
Technical Aspects ◽  
Operational Conditions ◽  
Qualitative And Quantitative ◽  
Detection Systems ◽  
Quantitative Score ◽  
Validation Procedure ◽  
Quantitative Validation

Now that the use of drones is becoming more common, the need to regulate the access to airspace for these systems is becoming more pressing. A necessary tool in order to do this is a means of detecting drones. Numerous parties have started the development of such drone detection systems. A big problem with these systems is that the evaluation of the performance of drone detection systems is a difficult operation that requires the careful consideration of all technical and non-technical aspects of the system under test. Indeed, weather conditions and small variations in the appearance of the targets can have a huge difference on the performance of the systems. In order to provide a fair evaluation, it is therefore paramount that a validation procedure that finds a compromise between the requirements of end users (who want tests to be performed in operational conditions) and platform developers (who want statistically relevant tests) is followed. Therefore, we propose in this article a qualitative and quantitative validation methodology for drone detection systems. The proposed validation methodology seeks to find this compromise between operationally relevant benchmarking (by providing qualitative benchmarking under varying environmental conditions) and statistically relevant evaluation (by providing quantitative score sheets under strictly described conditions).

scholarly journals Thermal Analysis of Bajaj Pulsar Disc Brake

2021 ◽  
pp. 306-312
Author(s):  
K. Kannan ◽  
N. Harikrishnan ◽  
A. Ragul ◽  
P. Vasantha Kumar ◽  
U. Veermani
Keyword(s):  
Thermal Analysis ◽  
Stainless Steel ◽  
Cast Iron ◽  
High Temperature ◽  
Aluminium Alloy ◽  
Maximum Speed ◽  
Disc Brake ◽  
Braking Process ◽  
Rotor Profiles

The disc brake is a device that used for reducing speed or discontinuing the cycle of the vehicle. many times, using the brake for vehicle starts to heat producing during braking process, such that disc brake undergoes breakage due to high temperature. Disc brake design is done through creo 4.0 and analysis is completed by using ANSYS18.1 workbench. The main purpose of this project is to study the Thermal analysis of the Materials for the Cast Iron, Stainless steel and aluminium alloy at various disc rotor profiles. A comparison between the three materials and profile for the Thermal values at maximum speed of the vehicle.

Liquid Ejection Through Orifices by Sparging Gas: The PERCOLA Program

2002 ◽  
Author(s):  
B. Tourniaire ◽  
J. M. Seiler ◽  
J. M. Bonnet ◽  
M. Amblard
Keyword(s):  
Quantitative Information ◽  
Experimental Program ◽  
General Description ◽  
Water Pool ◽  
Qualitative And Quantitative ◽  
Main Target ◽  
Calculation Results ◽  
Core Meltdown ◽  
Cooling Mechanism ◽  
Physical Phenomena

Corium coolability after a severe PWR accident involving core meltdown and RPV failure is one of the main items in nuclear safety. The case considered here is a situation in which the corium is supposed to spread over a concrete floor and is flooded by water. In this frame, many researches are performed to study the physical phenomena which may enhance the heat transfer between the corium and the water pool. Among them, the melt entrainment above the corium crust by the sparging gas released by the concrete ablation appears as a potentially efficient cooling mechanism. The main target of the experimental program PERCOLA is to provide qualitative and quantitative information on this entrainment phenomenon. The first part of this paper is devoted to a general description of the experimental program and to the presentation of the main results. In a second part, the attention is focused on the modelling of the liquid entrainment phenomenon and to the comparison between the experimental data and the calculation results of two different entrainment models.

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.

Sign in / Sign up

Export Citation Format

Share Document