Hinged or pivoted doors. Determination of the resistance to vertical load

1999 ◽  
Keyword(s):  
Vertical Load

scholarly journals Determination of the Vertical Load on the Carrying Structure of a Flat Wagon with the 18–100 and Y25 Bogies

2021 ◽  
Vol 11 (9) ◽  
pp. 4130
Author(s):  
Oleksij Fomin ◽  
Alyona Lovska ◽  
Václav Píštěk ◽  
Pavel Kučera
Keyword(s):  
Mathematical Model ◽  
Fatigue Strength ◽  
Service Life ◽  
Dynamic Characteristics ◽  
Dynamic Load ◽  
Field Tests ◽  
Vertical Load ◽  
Mathcad Software ◽  
The Mathematical Model

The study deals with determination of the vertical load on the carrying structure of a flat wagon on the 18–100 and Y25 bogies using mathematic modelling. The study was made for an empty wagon passing over a joint irregularity. The authors calculated the carrying structure of a flat wagon with the designed parameters and the actual features recorded during field tests. The mathematical model was solved in MathCad software. The study found that application of the Y25 bogie for a flat wagon with the designed parameters can decrease the dynamic load by 41.1% in comparison to that with the 18–100 bogie. Therefore, application of the Y25 bogie under a flat wagon with the actual parameters allows decreasing the dynamic loading by 41.4% in comparison to that with the 18–100 bogie. The study also looks at the service life of the supporting structure of a flat wagon with the Y25 bogie, which can be more than twice as long as the 18–100 bogie. The research can be of interest for specialists concerned with improvements in the dynamic characteristics and the fatigue strength of freight cars, safe rail operation, freight security, and the results of the research can be used for development of innovative wagon structures.

Experimental Studies of Force Systems on Steered Agricultural Tyres

1966 ◽  
Vol 181 (1) ◽  
pp. 133-148 ◽  
Author(s):  
P. A. Taylor ◽  
R. Birtwistle
Keyword(s):  
Experimental Determination ◽  
Experimental Studies ◽  
Soil Surface ◽  
Slip Angle ◽  
Vertical Load ◽  
Force Systems

The paper reports the experimental determination of the force systems acting on free-rolling 7–50 times 16 agricultural tyres, measured with a six-component suspension of the test wheel. Multivariate experimentation techniques were used involving five variables: slip angle, camber, vertical load, tyre pattern and land or furrow operation. The results are presented as three force and three moment components; other methods of representation are discussed briefly. Although the side or cornering force depends on many factors, particularly the soil surface, and is therefore difficult to predict, it is suggested that the draught force (i.e. resistance in the direction of motion) can be expressed as a function of slip for all surfaces.

scholarly journals Thermal consolidation of porous medium with a rheological kelvin–voigt skeleton

2012 ◽  
Vol 34 (3) ◽  
pp. 17-35 ◽  
Author(s):  
Monika Bartlewska-Urban ◽  
Tomasz Strzelecki
Keyword(s):  
Porous Medium ◽  
Temperature Gradient ◽  
Porous Plate ◽  
Model Parameters ◽  
Vertical Load ◽  
Consolidation Process ◽  
Biot Model ◽  
Thermal Consolidation ◽  
Deformation Tests

Abstract This study presents calculations results of thermal consolidation process of the porous medium with the rheological Kelvin-Voigt skeleton, obtained numerically with the use of Flex.PDE software. The investigated calculation scheme consisted of the porous column filled with a liquid. The vertical load was applied to the top surface of the column through a porous plate allowing the free flow of liquid through this surface. Numerical solution is based on compression of the sample at appropriately defined boundary conditions. The aim of this study was to describe the influence of external load and temperature gradient on the deformation tests progress at different values of three parameters: λ, rs and cv. The results obtained, in the context of further research, can also be used for the determination of the influence of other parameters of the state and model parameters on the process of thermo poroelasticity of Biot model with rheological skeleton.

scholarly journals Contact Area Determination of Agricultural Tractor Wheel with Soil

2012 ◽  
Vol 45 (2) ◽  
pp. 15-20 ◽  
Author(s):  
H. Taghavifar ◽  
A. Mardani
Keyword(s):  
Contact Area ◽  
Experimental Test ◽  
Theoretical Models ◽  
Vertical Load ◽  
Inflation Pressure ◽  
Soil Bin ◽  
Influential Parameters ◽  
Agricultural Tractor ◽  
Area Determination

Contact Area Determination of Agricultural Tractor Wheel with SoilThe study is established based on contact area determination of tractor wheel. The significance of contact area in domain of wheel-soil interactions is considerable. Requirement for contact area estimations has prompted the researchers to determine numerous theoretical models. In this study, an experimental test was conducted inside a soil bin facility providing entirely reliable and controlled condition for the test. The soil bin included a carriage, a single wheel-tester and a frame. The utilized tire was a towed Good year 9.5L-14, 6 radial ply agricultural tractor tire which is used in John Deere tractors This test has the advantage of utilizing images taken of the contact areas and subsequently, using a plantimeter to obtain the values of contact area precisely. Test variables were the two most prominent and influential parameters i.e. tire inflation pressure in three levels (i.e. 100, 150, and 290 kPa) and vertical load applied on wheel in three levels (i.e. 1962, 2943, and 3924 N). The acquired results revealed that there is an increase in contact area induced by increase of vertical load and decrease of contact pressure. Contact area is shown to be highly influenced by vertical load in reduced tire inflation pressures.

Theoretical Determination Of The Vertical Load On The Disk Work Tool For Destruction Of The Soil Crust

2018 ◽  
Vol 1 (6) ◽  
pp. 39-43
Author(s):  
Tuhtakuziev Abdusalim ◽  
◽  
Artikbaev Bakhtiyar Pirniyazovich
Keyword(s):  
Soil Crust ◽  
Vertical Load ◽  
Theoretical Determination

scholarly journals Effective Width Rule in the Analysis of Footing on Reinforced Sand Slope

2019 ◽  
Vol 41 (1) ◽  
pp. 42-55 ◽  
Author(s):  
Abdelmadjid Abdi ◽  
Khelifa Abbeche ◽  
Djamel Athmania ◽  
Mounir Bouassida
Keyword(s):  
Bearing Capacity ◽  
Ultimate Bearing Capacity ◽  
Strip Footing ◽  
Total Width ◽  
Effective Width ◽  
Vertical Load ◽  
Eccentric Load ◽  
Reinforced Sand ◽  
Good Agreement

AbstractThis paper presents the results obtained from an experimental programme and numerical investigations conducted on model tests of strip footing resting on reinforced and unreinforced sand slopes. The study focused on the determination of ultimate bearing capacity of strip footing subjected to eccentric load located either towards or opposite to the slope facing. Strip footing models were tested under different eccentricities of vertical load. The obtained results from tests conducted on unreinforced sand slope showed that the increase in eccentricity of applied load towards the slope facing decreases the ultimate bearing capacity of footing. Predictions of the ultimate bearing capacity obtained by the effective width rule are in good agreement with those proposed from the consideration of total width of footing subjected to eccentric load. The ultimate bearing capacity of an eccentrically loaded footing on a reinforced sand slope can be derived from that of axially loaded footing resting on horizontal sand ground when adopting the effective width rule and the coefficient of reduction due to the slope. When increasing the distance between the footing border to the slope crest, for unreinforced and reinforced ground slope by geogrids, the ultimate bearing capacity of footing is no more affected by the slope ground.

scholarly journals Determination of flexure arrow a felled tree

2017 ◽  
Vol 6 (2) ◽  
pp. 105-109
Author(s):  
Ушницкий ◽  
Aleksandr Ushnickiy ◽  
Григорьев ◽  
Mihail Grigor'ev
Keyword(s):  
Friction Force ◽  
Wood Density ◽  
Modulus Of Elasticity ◽  
Ground Surface ◽  
Bending Moment ◽  
Vertical Load ◽  
Body Of Revolution ◽  
Truncated Cone

It is known that the vertical load on the skidder including depends on the size characteristics hauling felled trees. In this case vertical load on the tractor is equal to the weight having caved in portion trees portion by the lower part of the tree cuta-way to the point of lifted from the ground surface and bending moment. For a determination of the weight the immersed por-tion is accounted distribution of mass along the length of felled trees wood density, modulus of elasticity and the friction force in felled trees the bundle. To simplify the calculation was performed at the following assumptions: a generator trunks accept how to defining body of revolution (truncated cone); wood density is uniform over the volume of that part of felled trees which is seen currently.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

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