ESTIMATE OF DESIGN ELEMENT STRENGTH IN LONG-RANGE RADIAL CONTROL OF WHEEL PAIRS OF TEP60 DIESEL LOCOMOTIVE

2020 ◽  
Vol 2020 (8) ◽  
pp. 33-38
Author(s):  
Evgeniy Slivinskiy
Keyword(s):  
Long Range ◽  
Mechanical Engineering ◽  
Scientific Research ◽  
Geometrical Parameters ◽  
Design Element ◽  
Contact Strength ◽  
Diesel Locomotive ◽  
Operation Conditions ◽  
Standard Values ◽  
Run Up

The contact strength calculations of machinery on basic geometrical parameters of a diesel locomotive bogie developed with the use of current procedures are carried out. There is shown a possibility for its creation and testing under operation conditions. A diesel locomotive jawless bogie is created at the level of invention which is recommended by scientific-research and manufacturing structures in the field of heavy mechanical engineering both in our country and abroad with the purpose of the further analysis and possible its introduction into practice. There is presented a development of a new diesel locomotive undercarriage unknown in world practice and supplied with RUKP allowing increasing a diesel locomotive run up to standard values and decreasing costs for diesel locomotive industrial and depot repair works.

scholarly journals Whither Acid Rain?

2000 ◽  
Vol 1 ◽  
pp. 10-10
Author(s):  
Peter Brimblecombe
Keyword(s):  
Acid Rain ◽  
Long Range ◽  
Scientific Research ◽  
Precipitation Chemistry ◽  
Long Range Transport ◽  
Theoretical Base ◽  
Research Papers ◽  
Sulfur Chemistry ◽  
Range Transport ◽  
Forested Ecosystems

Acid rain, the environmentalcause célèbreof the 1980s seems to have vanished from popular conscience. By contrast, scientific research, despite funding difficulties, has continued to produce hundreds of research papers each year. Studies of acid rain taught much about precipitation chemistry, the behaviour of snow packs, long-range transport of pollutants and new issues in the biology of fish and forested ecosystems. There is now evidence of a shift away from research in precipitation and sulfur chemistry, but an impressive theoretical base remains as a legacy.

An Optimization Design of the Auxiliary Impeller of Centrifugal Pumps Based on Orthogonal Methods

2011 ◽  
Author(s):  
Jianping Yuan ◽  
Rong Jin ◽  
Shujuan Li ◽  
Longyan Wang ◽  
Aixiang Ge
Keyword(s):  
Centrifugal Pump ◽  
Optimization Design ◽  
Geometrical Parameters ◽  
Pump Efficiency ◽  
Centrifugal Pumps ◽  
Blade Number ◽  
Operation Conditions ◽  
Axial Clearance ◽  
Sealing Pressure ◽  
Orthogonal Tests

In order to research the influence laws of the main geometrical parameters of auxiliary impeller and different operation conditions on the centrifugal pump with an auxiliary impeller, which aimed to act as dynamic seal, the orthogonal experiment was designed with four factors and three values. The factors respectively are auxiliary impeller axial clearance, blade width, outlet diameter and blade number. With simulation by Fluent, major and minor factors were investigated which influence the performance of the centrifugal pump with an auxiliary impeller. The cases with optimization sealing pressure value and optimization efficiency were obtained and it was proved by the experimental results. Then, two optimization cases and the original case were simulated and analyzed. The research results show that the major factor of auxiliary impellers for the pump efficiency is the outlet diameter. For sealing pressure head of auxiliary impellers, the major factor is the outlet diameter of auxiliary impeller and the axial clearance and blade number of the auxiliary impeller are secondary important factors. For the optimization of centrifugal pumps with an auxiliary impeller, numerical orthogonal tests can replace actual orthogonal tests.

THE INFLUENCE OF OPERATION CONDITIONS OF HYDROELECTRIC POWER PLANTS THE CHOICE OF THE MAIN PARAMETERS OF THE SUCTION PIPES

2015 ◽  
Vol 5 (4) ◽  
pp. 86-92 ◽  
Author(s):  
Mikhail Ivanovich BALZANNIKOV
Keyword(s):  
Power Plants ◽  
Draft Tube ◽  
Operating Conditions ◽  
Hydroelectric Power Station ◽  
Geometrical Parameters ◽  
Hydroelectric Power ◽  
Operation Conditions ◽  
Hydropower Plants ◽  
Large Water ◽  
Run Of River

Considered run-of-river hydropower plants (HPP). Notes the importance of technical-economic calculations in the justifi cation of large water-conducting elements of the path these types of HPP. The methodology of economic substantiation of the expediency of increasing the length of the draft tube. Using the technique of the calculations for lowpressure hydroelectric run-of-river type. The results of the analysis of the influence of the operating conditions of the hydroelectric power station on basic geometrical parameters of draft tube.

scholarly journals Application of Green Design and Manufacturing in Mechanical Engineering: Education, Scientific Research, and Practice

2021 ◽  
Vol 14 (1) ◽  
pp. 237
Author(s):  
Mengdi Gao ◽  
Qingyang Wang ◽  
Nan Wang ◽  
Zhilin Ma ◽  
Lei Li
Keyword(s):  
Mechanical Engineering ◽  
Manufacturing Industry ◽  
Teaching Method ◽  
Scientific Research ◽  
Implementation Strategies ◽  
Green Design ◽  
Teaching And Research ◽  
The Sustainable Development ◽  
Design And Manufacturing ◽  
Current Resource

Green design and manufacturing strategies are necessary to cope with the current resource, energy, and environmental problems of the manufacturing industry. To meet various enterprises’ needs for green design and manufacturing, colleges and universities should integrate these concepts into their curricula. This study discusses the application of green strategies in the mechanical engineering field from the viewpoints of teaching, scientific research, and practical education. Based on its development and a basic connotation analysis, this study highlights the challenges and urgency of incorporating green concepts into teaching and research modules of mechanical engineering, as well as methods and implementation strategies to incorporate them in professional curricula using teaching method reform and the teaching and research integration method. An experimental training course of advanced manufacturing processes at the authors’ institution was amended to emphasize the integrated application of green design and manufacturing. This integration not only enriches the field of mechanical engineering but also provides scientific research directions and methods to educators, along with new ideas to imbibe students with mechanical talents for their technical development. These efforts lay the foundation for the sustainable development of China’s manufacturing industry.

scholarly journals A reminder of the life and work of dr Vladimir Šolaja, full professor of the Faculty of Mechanical Engineering, University of Belgrade: On the occasion of the 100th anniversary of his birth (1920-2020)

Tehnika ◽  
2020 ◽  
Vol 75 (6) ◽  
pp. 719-724
Author(s):  
Milenko Jovičić ◽  
Ljubodrag Tanović ◽  
Mihajlo Popović
Keyword(s):  
20Th Century ◽  
Mechanical Engineering ◽  
Research Work ◽  
Scientific Research ◽  
100Th Anniversary ◽  
Full Professor ◽  
Production Engineering ◽  
Scientific Research Work ◽  
History Of ◽  
History Of Engineering

The paper was written on the occasion of the 100th anniversary of the birth of Dr. Vladimir Šolaja, a full professor at the Faculty of Mechanical Engineering, University of Belgrade, to remind his numerous students and associates and the wider engineering public in the field of mechanical engineering of his life and work. It contains basic data from the working biography and its most important contributions to the improvement of educational curricula and organizing of scientific research work in the field of production engineering in Serbia in the second half of the 20th century and research on the history of engineering in Serbia.

scholarly journals IMPROVEMENT OF HARD-ALLOY END COMPOUND MILLER

2017 ◽  
Vol 2017 (1) ◽  
pp. 50-57
Author(s):  
Анна Морозова ◽  
Anna Morozova ◽  
Борис Мокрицкий ◽  
Boris Mokritskiy ◽  
Максим Подойницын ◽  
...  
Keyword(s):  
Computer Simulation ◽  
Hard Alloy ◽  
High Performance ◽  
Mechanical Engineering ◽  
Cost Price ◽  
Machining Quality ◽  
Operation Conditions ◽  
Material Costs ◽  
Quality Material ◽  
The Cost

The paper reports the concept, the methodology and results of the investigation of possibilities in the application of compound hard-alloy end millers equally with monolithic ones. It is shown that in the majority of operation conditions for general mechanical engineering the compound millers ensure the reduction of tool costs in the cost price of a product at the expense of tool hard alloy saving through manufacturing a miller shank with the use of cheaper material and a place of joining a shank and a cutting element ensures miller operation on high performance modes of cutting without detriment to productivity and machining quality. Material costs at the expense of the reduction of tool hard alloy used are decreased by 30-70% depending on material of a shank and a miller length. The example of compound miller design is presented. The method and results of the deformation computer simulation of such a miller under different operation conditions, error values in machining with a compound miller are illustrated.

scholarly journals CALCULATION OF CONTROLLED TIGHTENING EFFORT IN GROUP BOLTED JOINT

2020 ◽  
Vol 2020 (6) ◽  
pp. 12-21
Author(s):  
Ruslan Guchinskiy
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Reliable Estimate ◽  
Load Factor ◽  
Geometrical Parameters ◽  
Standard Group ◽  
Bolted Joint ◽  
Operation Conditions ◽  
First Time ◽  
Element Method

The optimum value choice of a tightening effort is significant for assurance of a reliable operation of a group bolted joint. A work goal consists in the calculation and comparison of essential conditions of tightening efforts for a bolted joint of a bracket and a plate with analytical and numerical methods. For the first time it is obtained that the use of tightening factors recommended in literature by the condition of joint density may fail to ensure its non-disclosure. It is shown that a basic load factor for a bolt of a group joint depends not only upon bolt and flanges yielding, but upon loading and geometrical parameters of a joint. Basic loading factors obtained through a finite element method for a group bolted joint proved to be below ones defined analytically. The use of the procedure for bolt calculations on the basis of the assurance of joint complete non-disclosure results in increased values of tightening efforts caused by non-uniformity of contact stress distribution in flanges because of tightening. There is specified a field of application of the calculation procedure on joint non-disclosure – group joints with high stiffness flanges. At preliminary estimate the efforts for tightening a standard group joint a procedure of joint non-disclosure with the increased tightening factor and a condition of shift absence is recommended for use. To obtain a reliable estimate of the required tightening effort after its preliminary selection it is recommended to check up operation conditions of a group bolted joint with the aid of the calculation through the finite element method.

Designing Peculiarities and Classification of Compositional Technologies in Mechanical Engineering

2013 ◽  
Vol 371 ◽  
pp. 898-902
Author(s):  
Aleksandr Mikhaylov ◽  
Dmitriy Mikhaylov ◽  
Elena Mikhaylova ◽  
Irina Petryaeva ◽  
Ilia Navka
Keyword(s):  
Technical Progress ◽  
Mechanical Engineering ◽  
New Technologies ◽  
Operation Conditions ◽  
Product Function ◽  
Function Loss ◽  
Scientific Technical ◽  
New Generation

Scientific technical progress demands of technologists decision of questions concerning cardinal improvement of quality of engineering products, and also providing of breakthrough aggregation of features and their practicality measure. In particular, it is necessary for hardware which works under severe operation conditions, and to features of which great demands are made. There are a lot of different functions which affect products in operation conditions. And these functions have variable action parameters. That fact in some cases leads to quick product function loss and to reduction of operating properties of machine or technological system. So, engineering products should be provided by unconventional properties [1, 2, . In order to resolve the problems we need nontraditional approaches in development of fundamentally new technologies. They should allow solving complicated problems of new generation of machines development with properties composition, got through application of different in significance technologies [.

Preliminary study on supercritical hydrogen and bleed air heat exchanger for aircraft application

2017 ◽  
Vol 232 (12) ◽  
pp. 2231-2243
Author(s):  
Piotr Łapka ◽  
Mirosław Seredyński ◽  
Andrzej Ćwik
Keyword(s):  
Heat Exchanger ◽  
Numerical Models ◽  
Geometrical Parameters ◽  
Commercial Aircraft ◽  
Pressure Drops ◽  
Nusselt Numbers ◽  
Operation Conditions ◽  
Using Data ◽  
Semi Empirical ◽  
Aircraft Application

In this paper, the new idea of the supercritical hydrogen–bleed air heat exchanger for future aircraft propulsion technology is investigated. The proposed heat exchanger will be located in the nacelle of commercial aircraft, and therefore is subjected to several geometrical constrains. At first, the initial geometry was proposed and then based on constrains and assumed operation conditions the main geometrical parameters and dimensions of the heat exchanger were calculated and optimized. The analyses were carried out by developing simple thermo-fluid 1D mathematical and numerical models of the heat exchanger, which were based on its geometrical features, directions of streams of hydrogen, and bleed air as well as on semi-empirical correlations for local Nusselt numbers and pressure drops for supercritical hydrogen and bleed air flows. The 1D model was partially validated using data from the experimental measurements. Then based on the obtained results, the final geometry of the supercritical hydrogen–bleed air heat exchanger was proposed.

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.

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