scholarly journals MODELING THE TRANSMISSION OF A MOBILE MEANS ON TIRES OF EXTRA LOW PRESSURE TAKING INTO ACCOUNT THE INFLUENCE OF ROAD UNEQUALITIES

2020 ◽  
Vol 8 (1) ◽  
pp. 272-277
Author(s):  
P. Kolyadin ◽  
Vladimir Pryadkin
Keyword(s):  
Low Pressure ◽  
Dynamic Effects ◽  
Vehicle Model ◽  
Mobile Vehicle ◽  
Sudden Failure ◽  
Transfer Case ◽  
Basic Characteristics ◽  
Technological Means ◽  
Final Drive ◽  
Engine Crankshaft

The work is devoted to the problem of negative dynamic effects on the transmission and the engine of a mobile vehicle on ultra-low pressure tires. When using this propulsion device on technological means, the load on wheel reducers (final drives), half shafts, differential, final drive, on the shaft and cardan drive hinges, spline connection, transfer case, elastic transmission clutch, transmission drive and driven shafts sharply increases with gears, clutch driving and driven parts, engine crankshaft. When the load on these elements is excessive, their service life is reduced, and excessive loading can even lead to a sudden failure. Since each of these nodes is somehow fixed on the frame of the vehicle, to which vibrations from the unevenness of the rolling surfaces perceived by the propulsion are transmitted, they also have an additional effect. For a comprehensive assessment of the dynamic loading of the transmission and the engine of a mobile vehicle equipped with ultra-low pressure tires, taking into account the influence of road irregularities, a mobile vehicle model was compiled. The model will allow a more accurate calculation of the basic characteristics of technological equipment transmissions on ultra-low pressure tires.

Gasdynamic Design Numerical Optimization of High-Loaded Subsonic Stages for Low Pressure Steam Turbine

2013 ◽  
Author(s):  
Aleksei Dolganov ◽  
Alexander Nekrasov
Keyword(s):  
Steam Turbine ◽  
Power Plants ◽  
High Efficiency ◽  
Low Pressure ◽  
Large Capacity ◽  
Low Pressure Turbine ◽  
Relative Pitch ◽  
Pressure Steam ◽  
Basic Characteristics

Modern large capacity steam turbine for fossil power plants should have a high efficiency to be competitive in today’s tough market. It should be compact, with a smaller mass for reducing cost. In these circumstances, an effective solution is to create a large capacity steam turbine that consists of integrated high-intermediate-pressure turbine (HIPT) and one low-pressure turbine (LPT). Greater heat drop as compared to a conventional turbine shall be provided in LPT of such steam turbine. With this rather high efficiency of the low-pressure turbine should be provided. The performance of LPT depends not only on the efficiency of trans- and supersonic stages, but also on the efficiency of subsonic upstream stages. At a time when the overall heat drop in the low-pressure turbine is increased, role of the upstream subsonic stages also increases, provided that the design of stages L-0 and L-1 is maintained. This paper presents results of numerical simulation of an optimized subsonic stages section for a new low-pressure steam turbine. Simulation results of a conventional subsonic stages section are presented for comparison. Stages of the optimized subsonic section have a number of features: increased disposable heat drop, enlarged relative pitch, spline representation of sections of blade profiles, 3D airfoil design. The comparison of normalized integral basic characteristics, plots of the main parameters on the blade height, diagrams of the normalized pressure in individual cylindrical sections is given for optimized and conventional cases.

Dynamic Effects on a Pre-Stressed Multi-Story Plane Steel Frame Caused by Sudden Failure of a Cable

2013 ◽  
Vol 671-674 ◽  
pp. 441-445 ◽  
Author(s):  
Fei Wang ◽  
Bai Jian Tang
Keyword(s):  
Failure Time ◽  
Lateral Displacement ◽  
Bending Moment ◽  
Dynamic Effects ◽  
Finite Element Software ◽  
Stiffness Reduction ◽  
Sudden Failure ◽  
Plane Frame ◽  
Internal Forces ◽  
Plane Steel Frame

The dynamic effects on a pre-stressed multi-story steel plane frame caused by sudden failure of a pre-stressed cable were investigated by general finite element software. The stiffness reduction method was adopted to simulate sudden cable rupture, which can induce dynamic response of the pre-stressed multi-story plane frame. The numerical results show that the recommended failure time should be less than 1/20 of the fundamental period of the remaining structure to consider dynamic effects more accurately. As the failure time decreases, the amplitudes of structural top lateral displacement and internal forces at the column ends all increase and they decay more slowly. The dynamic coefficients of bending moment and shear force are larger than that of axial force at the column ends. The farther the beam is from the failed cable, the faster the bending moment at the beam end decays, and the larger its dynamic coefficient is.

scholarly journals BASIC CHARACTERISTICS OF THE PLUVIOMETRIC REGIME IN THE UNA RIVER BASIN

2018 ◽  
Vol 6 (2) ◽  
pp. 234-245
Author(s):  
Korjenić Aida ◽  
Temimović Emir ◽  
Banda Amra ◽  
Sivac Amina
Keyword(s):  
Relative Humidity ◽  
Water Balance ◽  
River Basin ◽  
Great Influence ◽  
Low Pressure ◽  
Special Role ◽  
Medium Scale ◽  
Precipitation Structure ◽  
Basic Characteristics

Intensity of action and frequency of high and low pressure barometric fields of large and medium scale have great influence on dynamics of pluviometric regime. On their action depend characteristics of thermic regime, relative humidity, cloudiness and windiness, which directly affect the precipitation. Concerning that the water balance is difference between the inflow and evaporation, it comes that precipitations do not have just special role, but they are also the most important factor of the Una river regime. Disposition and precipitation structure are the river regime's essential assumptions, so at the same annual height of precipitation, we have more water in rivers in the year with more precipitations during the colder period. Then we have less evaporation so the inflow from the basin is bigger. The amount and disposition of the precipitation in the Una River basin is analyzed in this paper in order to define the pluviometric regime of this area. Pluviometric regime greatly influences the Una river regime and water balance, what was the reason for this analysis and further hydrological research in the Una River basin.

scholarly journals Estimation of energy consumption for rolling a mobile vehicle equipped with ultra-low-pressure tires

2021 ◽  
Vol 285 ◽  
pp. 07023
Author(s):  
Vladimir Pryadkin ◽  
Artyom Artyomov ◽  
Pavel Kolyadin ◽  
Nikolay Bakach
Keyword(s):  
Energy Consumption ◽  
Test Bench ◽  
Experimental Studies ◽  
Low Pressure ◽  
Optimal Range ◽  
Tire Pressure ◽  
Propulsive Efficiency ◽  
Power Sources ◽  
Mobile Vehicle ◽  
Reducing Energy

The article deals with the problem of reducing energy consumption when moving mobile power sources on deformable support bases. On basis of experimental studies using test-bench equipment, the main output parameters of 1020x420-18 tire of Bel-79 model were determined. Analysis of the results obtained made it possible to determine an optimal range of intra-tire pressure, when the realized propulsive efficiency takes maximum values, and energy consumption for selfpropulsion is minimal.

scholarly journals Finite element head model for the crew injury assessment in a light armoured vehicle

2020 ◽  
Vol 22 (2) ◽  
Author(s):  
Michał Burkacki ◽  
Wojciech Wolański ◽  
Sławomir Suchoń ◽  
Kamil Joszko ◽  
Bożena Gzik-Zroska ◽  
...  
Keyword(s):  
Finite Element ◽  
Head Injury ◽  
Human Head ◽  
Element Model ◽  
Head Model ◽  
Dynamic Effects ◽  
Vehicle Model ◽  
Future Studies ◽  
Injury Assessment

Purpose: The aim of this paper was the development of a finite element model of the soldier’s head to assess injuries suffered by soldiers during blast under a light armoured vehicle. Methods: The application of a multibody wheeled armoured vehicle model, including the crew and their equipment, aenabled the researchers to analyse the most dangerous scenarios of the head injury. These scenarios have been selected for a detailed analysis using the finite element head model which allowed for the examination of dynamic effects on individual head structures. In this paper, the authors described stages of the development of the anatomical finite element head model. Results: The results of the simulations made it possible to assess parameters determining the head injury of the soldier during the IED explosion. The developed model allows the determination of the parameters of stress, strain and pressure acting on the structures of the human head. Conclusion: In future studies, the model will be used to carry out simulations which will improve the construction of the headgear in order to minimize the possibility of the head injury.

Effects of Electrical Discharges in Low Pressure Gases on the Morphology of Polyethylene Crystals

1974 ◽  
Vol 32 ◽  
pp. 544-545
Author(s):  
L.H. Bolz ◽  
D.H. Reneker
Keyword(s):  
Power Distribution ◽  
Electrical Discharge ◽  
Dielectric Breakdown ◽  
Ionic Species ◽  
Low Pressure ◽  
Polymer Surfaces ◽  
Electrical Discharges ◽  
Adhesive Bonds ◽  
Power Distribution Lines ◽  
Modification Of The Surface

The attack, on the surface of a polymer, by the atomic, molecular and ionic species that are created in a low pressure electrical discharge in a gas is interesting because: 1) significant interior morphological features may be revealed, 2) dielectric breakdown of polymeric insulation on high voltage power distribution lines involves the attack on the polymer of such species created in a corona discharge, 3) adhesive bonds formed between polymer surfaces subjected to such SDecies are much stronger than bonds between untreated surfaces, 4) the chemical modification of the surface creates a reactive surface to which a thin layer of another polymer may be bonded by glow discharge polymerization.

Field ion microscopy

1988 ◽  
Vol 46 ◽  
pp. 434-435
Author(s):  
Gert Ehrlich
Keyword(s):  
Low Temperature ◽  
Sample Surface ◽  
Low Pressure ◽  
Radius Of Curvature ◽  
Field Ion Microscopy ◽  
Phosphor Screen ◽  
Ion Microscopy ◽  
Field Ion Microscope

The field ion microscope, devised by Erwin Muller in the 1950's, was the first instrument to depict the structure of surfaces in atomic detail. An FIM image of a (111) plane of tungsten (Fig.l) is typical of what can be done by this microscope: for this small plane, every atom, at a separation of 4.48Å from its neighbors in the plane, is revealed. The image of the plane is highly enlarged, as it is projected on a phosphor screen with a radius of curvature more than a million times that of the sample. Müller achieved the resolution necessary to reveal individual atoms by imaging with ions, accommodated to the object at a low temperature. The ions are created at the sample surface by ionization of an inert image gas (usually helium), present at a low pressure (< 1 mTorr). at fields on the order of 4V/Å.

Development of imaging plate for a TEM and its characteristics

1989 ◽  
Vol 47 ◽  
pp. 100-101
Author(s):  
N. Mori ◽  
T. Oikawa ◽  
Y. Harada ◽  
J. Miyahara ◽  
T. Matsuo
Keyword(s):  
Dynamic Range ◽  
Protective Layer ◽  
High Sensitivity ◽  
Imaging Plate ◽  
Phosphor Layer ◽  
Imaging Device ◽  
X Ray Imaging ◽  
New Type ◽  
Basic Characteristics ◽  
Reading System

The Imaging Plate (IP) is a new type imaging device, which was developed for diagnostic x ray imaging. We have reported that usage of the IP for a TEM has many merits; those are high sensitivity, wide dynamic range, and good linearity. However in the previous report the reading system was prototype drum-type-scanner, and IP was also experimentally made, which phosphor layer was 50μm thick with no protective layer. So special care was needed to handle them, and they were used only to make sure the basic characteristics. In this article we report the result of newly developed reading, printing system and high resolution IP for practical use. We mainly discuss the characteristics of the IP here. (Precise performance concerned with the reader and other system are reported in the other article.)Fig.1 shows the schematic cross section of the IP. The IP consists of three parts; protective layer, phosphor layer and support.

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