scholarly journals APPLICATION OF HYBRID TECHNOLOGY LASER CLEANING DURING REPAIR PARTS LOCOMOTIVES

2015 ◽  
Vol 2 (158) ◽  
Author(s):  
Natalíya Dmitrívna Chygyryk ◽  
Vadim Gavrilov
Keyword(s):  
Mechanical Engineering ◽  
Surface Cleaning ◽  
Laser Cleaning ◽  
Application Area ◽  
Purification Process ◽  
Railway Transport ◽  
Diesel Locomotive ◽  
Hybrid Technology ◽  
Competitive Process

A new application area of lasers is reviewed: a surface cleaning, which finds all the broader application in various branches from microelectronics, instrumentation and mechanical engineering tosciences, arts, and medicine. This article has a purpose – to show that the change of generations in laserequipment turns the purification process, accomplished with laser, into a completely competitive process,which is now, should be considered by engineers of railway transport as a serious alternative.It’s also shown a concept of combined laser cleaning and care of the surface in the technologicalprocess of repair of pistons in diesel locomotive engines.

scholarly journals Observation of the Laser Cleaning Effect on the Gotland Sandstone Elemental Composition

2006 ◽  
Vol 2006 ◽  
pp. 1-6 ◽  
Author(s):  
Marta Jasińska ◽  
Jørn Bredal-Jørgensen ◽  
Gerard Śliwiński
Keyword(s):  
Elemental Composition ◽  
Laser Irradiation ◽  
Surface Cleaning ◽  
Laser Cleaning ◽  
Laser Surface ◽  
Stone Surface ◽  
Initial Value ◽  
Surface Destruction ◽  
Initial Content

Changes of the elemental composition due to laser surface cleaning of a naturally crusted historical sandstone were investigated by means of the SEM/EDX technique. Data obtained for stone samples prior to and after laser irradiation were compared with those for noncrusted, reference ones. It has been observed that the crust removal resulting from ablative cleaning was accompanied by a decrease of the partial content of elements Al, S, K, Ca, and Mg in the range of 60–80% of their initial value recorded for the noncleaned, crust-covered stone surface. In the stone layer just under the crust coverage, a structure characterized by intergranular spaces between the SiO2 grains being the main sandstone component filled with degraded binder was observed. From the coincidence of the binder destruction and chemical composition of the crust, the stone surface destruction due to the long-term interaction of environmental pollution was deduced. The spatial distributions of individual elements obtained by mapping after laser irradiation indicated that besides SiO2 the content of elemental components in the sandstone surface layer decreased by 50%, whereas for Fe with the initial content of 4% and other surface remnants: P, Ti, Zn, and Cl—all below 1%, insignificant changes were only revealed. It was concluded in agreement with the literature that surface cleaning by means of the 1064 nm laser does not cause removal of iron from the sandstone surface.

Automatic Control and Real-Time Monitoring of Laser Cleaning and Laser Ablation

1998 ◽  
Vol 526 ◽  
Author(s):  
Y.F. Lu ◽  
M. Meng ◽  
M.H. Hong ◽  
T.S. Low ◽  
D.S.H. Chan
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Real Time ◽  
Excimer Laser ◽  
Automatic Control System ◽  
Surface Cleaning ◽  
Laser Cleaning ◽  
Laser Surface ◽  
Feedback Signal ◽  
Real Time Monitoring

AbstractClosed-loop control and real-time monitoring of pulsed excimer laser cleaning and ablation have been realised by software and hardware design and development. The audible acoustic wave generated during excimer laser surface cleaning and ablation has been used as the feedback signal for the automatic control system of laser-surface interaction. Man–machine interface for laser operation and acoustic monitoring has been developed with LabVIEW 4.1 under Windows 95 environment. This system has been used to control and monitor laser cleaning and ablation processes in real-time and proven to successfully meet the requirements in our study. By database exchange, this automatic control system can also be applied to control drilling and materials removing.

scholarly journals ECOLOGICAL ASPECTS OF USING BIOLOGICAL DIESEL OIL IN RAILWAY TRANSPORT

Transport ◽  
2008 ◽  
Vol 23 (2) ◽  
pp. 138-143 ◽  
Author(s):  
Leonas Povilas Lingaitis ◽  
Saugirdas Pukalskas
Keyword(s):  
Comparative Analysis ◽  
Methyl Ester ◽  
Rapeseed Oil ◽  
Internal Combustion Engines ◽  
Diesel Oil ◽  
Combustion Engines ◽  
Environment Protection ◽  
Railway Transport ◽  
Diesel Locomotive ◽  
Ecological Aspects

The number of various transport facilities used in Europe is rapidly growing. They release a big amount of pollutants into the atmosphere. Therefore, environment protection from these pollutants ejected by internal combustion engines is a key problem facing us today and which will be acute in the future. Biofuel is the only effective and widely used alternative fuel which can reduce pollution of the environment. The main aim of the present paper is to perform a comparative analysis of burnt gases of engines using rapeseed oil methyl ester and petroleum diesel oil and to determine ecological effectiveness of biofuel used in diesel locomotive engines in railway transport.

scholarly journals Research tools aplicable in designing of high-speed and high-power rail vehicles

2021 ◽  
Vol 31 ◽  
pp. 10-17
Author(s):  
Vojtěch Dybala
Keyword(s):  
High Power ◽  
High Speed ◽  
Mechanical Engineering ◽  
Dynamic Behaviour ◽  
Road Transport ◽  
Railway Vehicle ◽  
Railway Transport ◽  
Laboratory Equipment ◽  
Research Activities ◽  
Rail Vehicles

The importance of the railway transport of both goods and passengers continuously grows as it is in many points of view more ecological and economical solution in comparison with road transport. Just the importance has been supporting efforts to design more powerful and faster trains reaching traction powers more than 1.6 MW per a wheel-set or service top speed much more than 300 km/h till these days. To reach design which has enabled such a kind of performances it was necessary to research dynamic behaviour of railway vehicles. Both via laboratory measurements and simulations. The laboratory experiments have been carried out on a specially designed laboratory equipment called roller rigs. A laboratory equipped by roller rig for testing of the railway vehicle dynamic behaviour has been built at the Faculty of Mechanical Engineering at CTU in Prague, also within PhD studyprograms and SGS grants. Another powerful tool within research activities is a simulation. Kind of a such simulation will be presented by this contribution with the focus on the torsion dynamics of high-power fully-suspended drive of a railway vehicle, which has been developed also by PhD students under financial support of The Faculty of Mechanical Engineering and related grants.

scholarly journals Stress-strain state of friction joints with laser treatment of contact surfaces

Vestnik MGSU ◽  
2019 ◽  
pp. 72-82
Author(s):  
Martynov Gleb V ◽  
Aleksey I. Makarov ◽  
Elena A. Morina ◽  
Daria E. Monastyreva
Keyword(s):  
Safety Margin ◽  
High Strength ◽  
Hydraulic Press ◽  
Surface Cleaning ◽  
Laser Cleaning ◽  
Strength Characteristics ◽  
Future Research ◽  
High Tech ◽  
Widespread Application ◽  
Contact Surfaces

Introduction. Researched is conducted to determine the possibility of using an alternative method - laser cleaning. Laser systems have proven themselves in many areas and are a high-tech and effective solution for many construction problems. Despite this nowadays sandblasting is the most common method of processing contact surfaces of high-strength bolted joints - an outdated technology, with high equipment wear and even dangerous to people’s health. Materials and methods. Sandblast and laser-treated specimens were tested for shear. Before testing, the roughness of the contact surfaces and the tension force of high-strength bolts were tested. During the test, the readings of the meter and dial-indicator were taken. The experiments were carried out on a hydraulic press IPS-500, the samples were provided in a processed form. Results. According to the data obtained, strain graphs were plotted and the shear forces of the samples were calculated. Calculated efforts were compared with standard values. The results show the compliance of samples with the requirements of SP 35.13330.2016 “Bridges and pipes” in terms of strength characteristics. Samples with laser surface cleaning have a safety margin value similar to sandblasted samples. Conclusions. Comparison of the strength characteristics proves the possibility of using laser cleaning of the contact surfaces of friction joints. After the transition from outdated technologies, the process of surface preparation can be made economical and environmentally friendly. The obtained values and data can be entered into a number of regulatory documents, including SP 35.13330.2016 “Bridges and pipes” for future research and the widespread application of the method.

Effect of different laser energy densities on the corrosion resistance of aluminum alloys

2020 ◽  
Vol 67 (5) ◽  
pp. 437-444
Author(s):  
Di Xie ◽  
Hui Chen ◽  
Siyi Yin ◽  
Feisen Wang ◽  
Jingwen Chen ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Energy Density ◽  
Surface Cleaning ◽  
Laser Cleaning ◽  
Chemical Cleaning ◽  
Content Type ◽  
Cleaning Equipment ◽  
Surface Laser

Purpose Laser cleaning, as a new type of cleaning technology, has the advantages of environment-friendliness, better selectivity, better controllability and higher efficiency compared to traditional chemical cleaning or grinding. This paper aims to use ultra-fast surface laser cleaning equipment built in laboratory to study the influence of different energy density (7.6, 11.5 and 15.3 J/cm2) on corrosion resistance of the aluminum alloy A7N01P-T4, a high-speed train body material. Design/methodology/approach SEM, white light interferometer, EDS and XPS were used to analyze the surface morphology, roughness, element content and oxide layer composition of aluminum alloy before and after cleaning. The corrosion resistance was studied by electrochemical experiments and exfoliation corrosion experiments. Findings The results showed that new oxide scale was formed on the surface after laser cleaning. The changes of surface roughness and chemical composition of oxide scale made a significant influence on corrosion behaviors. Better corrosion resistance was obtained with the energy density increased, and at the energy density of 11.5 J/cm2, aluminum alloy exhibited the best corrosion resistance. Research limitations/implications The paper only studies specific aluminum alloys and is not universal. Laser cleaning equipment is set up for the laboratory and has not yet been put into industrial production. Practical implications This paper indicated that ultra-fast laser processing was a new direction for the development of industrial equipment surface cleaning and carried out ultra-fast laser of aluminum alloy surface cleaning had certain research significance for its corrosion resistance. Social implications Compared with the conventional cleaning methods such as air abrasives grinding or chemical cleaning, laser cleaning has advantages of environment-friendliness, better selectivity, better controllability and higher efficiency. Laser cleaning can not only protect the environment, but also improve cleaning efficiency. Originality/value Changes in the surface of aluminum alloys after ultra-fast surface laser treatment were found, and the mechanism of changes in aluminum alloy corrosion properties was clarified.

ANALYSIS OF EFFECTIVENESS OF THE RISK MANAGEMENT SYSTEM FOR OCCURRENCE OF OCCUPATIONAL DISEASES FOR THE MOST DANGEROUS PROFESSIONS IN BELARUSIAN RAILWAY

2021 ◽  
Author(s):  
V.V. Makeyev ◽  
◽  
T.M. Rybina ◽  
M.V. Bliznets ◽  
Keyword(s):  
Occupational Diseases ◽  
Systematic Approach ◽  
Management Systems ◽  
Contact Network ◽  
Railway Transport ◽  
Electric Locomotive ◽  
Diesel Locomotive ◽  
Production Factors ◽  
Risk Management System ◽  
The Republic

Abstract. The work examines the most dangerous, according to the results of certification of workplaces, professions of railway transport: driver (assistant) of an electric locomotive and a diesel locomotive, an attendant at a railway station, a track fitter, an electrician of a contact network. An analysis of the legislative acts in force in the Republic of Belarus, as well as local regulatory legal acts created on their basis, OSH management systems based on STB ISO 45001, the results of workplace certification showed the need to create a systematic approach to managing the risks of developing occupational diseases in the most dangerous professions on the railway. The work systematizes the factors that have the greatest influence on the risk of developing occupational diseases, based on the generalization and analysis of certification of workplaces, the leading production factors of the listed professions are highlighted.

scholarly journals Improved method of processing the output parameters of the diesel locomotive engine for more efficient maintenance

2021 ◽  
Vol 23 (2) ◽  
pp. 315-323
Author(s):  
Peter Zvolenský ◽  
Dalibor Barta ◽  
Pawel Pawel Droździel ◽  
Ľubomír Kašiar
Keyword(s):  
Diesel Engine ◽  
Rolling Stock ◽  
Electronic Control ◽  
Railway Transport ◽  
Improved Method ◽  
Diagnostic Equipment ◽  
Diesel Locomotive ◽  
Environmental Friendliness ◽  
Electronic Control System ◽  
Locomotive Engine

Modernization of aged rolling stock is one of the possibilities to adapt it to the current requirements for better environmental friendliness and economy of railway transport. However, some vehicle upgrades lead to new failures that were not observed in the original vehicles. The cause is the so-called “hybrid design”, built on a combination of original and selected new components. The aim of the work was to improve the situation with frequent failures and unavailability that occur on the modernized locomotive where a new diesel engine and new electronic control system was installed. Within the work, a simplified methodology for evaluating the outputs of diagnostic equipment was developped based on and applied to specific locomotive type and its diesel engine. The methodology resulted in a significant reduction of the time for assessing the condition of the vehicle’s diesel engine and more effective maintenance. The paper also presents other possibilities in the analysis of big data in the maintenance of rolling stock e.g. using fuzzy logic.

A study on the removal of paint and oxide layer on the steel surface by laser beam scanning method

2021 ◽  
pp. 2140006
Author(s):  
Ji-Eon Kim ◽  
Jong-Do Kim
Keyword(s):  
Laser Beam ◽  
Oxide Layer ◽  
Steel Surface ◽  
Surface Cleaning ◽  
Laser Cleaning ◽  
Beam Scanning ◽  
Scanning Method ◽  
Line Beam ◽  
Laser Beam Scanning ◽  
Beam Patterns

In this study, a laser cleaning method was developed in order to replace the existing manual work-based technologies. The experimental investigation analyzed the cleaning properties of the paint and the oxide layer on the steel surface according to the laser beam scanning method. Experiments showed that in the cleaning process, the line beam patterns with a moving stage showed differences in heat input depending on the area, and the square area beam patterns obtained with control of a Galvano scanner showed uniform cleaning performance. The results of this study demonstrated that through the prosed laser cleaning technique, oxide layers as well as paint on steel surfaces can be removed with excellent precision, which is expected to be useful in the development of eco-friendly surface cleaning techniques.

scholarly journals Improved method of processing the output parameters of the diesel locomotive engine for more efficient maintenance

2021 ◽  
Vol 23 (2) ◽  
pp. 315-323
Author(s):  
Peter Zvolenský ◽  
Dalibor Barta ◽  
Juraj Grenčík ◽  
Paweł Droździel ◽  
Ľubomír Kašiar
Keyword(s):  
Diesel Engine ◽  
Rolling Stock ◽  
Electronic Control ◽  
Railway Transport ◽  
Improved Method ◽  
Diagnostic Equipment ◽  
Diesel Locomotive ◽  
Environmental Friendliness ◽  
Electronic Control System ◽  
Locomotive Engine

Modernization of aged rolling stock is one of the possibilities to adapt it to the current requirements for better environmental friendliness and economy of railway transport. However, some vehicle upgrades lead to new failures that were not observed in the original vehicles. The cause is the so-called “hybrid design”, built on a combination of original and selected new components. The aim of the work was to improve the situation with frequent failures and unavailability that occur on the modernized locomotive where a new diesel engine and new electronic control system was installed. Within the work, a simplified methodology for evaluating the outputs of diagnostic equipment was developped based on and applied to specific locomotive type and its diesel engine. The methodology resulted in a significant reduction of the time for assessing the condition of the vehicle’s diesel engine and more effective maintenance. The paper also presents other possibilities in the analysis of big data in the maintenance of rolling stock e.g. using fuzzy logic.

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