scholarly journals Calculation of the deflected mode of conical roofs under the symmetric load

2018 ◽  
Vol 0 (1) ◽  
pp. 82-90
Author(s):  
N. А. Makhinko
Keyword(s):  
Deflected Mode ◽  
Symmetric Load

Structural Analysis and Internal Force Calculation of Variable Cross-Section Silo

2012 ◽  
Vol 446-449 ◽  
pp. 429-434
Author(s):  
Rui Ting Ma
Keyword(s):  
Cross Section ◽  
Variable Cross Section ◽  
Internal Force ◽  
Variable Cross ◽  
Axially Symmetric ◽  
Internal Forces ◽  
Differential Element ◽  
Symmetric Load ◽  
Force Calculation ◽  
Constant Section

In this paper, the differential element of constant-section silo wall suffering from axially symmetric load is analyzed. From the results of constant-section silo, the author derives the displacements and internal forces of variable cross-section silo. Through a specific example, this paper compares the displacements , internal forces and concrete consumption of variable cross-section silo with those of constant-section silo, and discusses the merits of variable cross-section silo.

Microstructure Evolution of Nickel-Based Superalloys Induced by Thermomechanical Processing - Simulation and Verification

2018 ◽  
Vol 385 ◽  
pp. 424-429 ◽  
Author(s):  
Shamil Mukhtarov ◽  
Farid Z. Utyashev ◽  
Ruslan Shakhov
Keyword(s):  
Microstructure Evolution ◽  
Thermomechanical Processing ◽  
Strain Rates ◽  
Microstructure Formation ◽  
Turbine Engine ◽  
Fine Grained ◽  
Gamma Prime ◽  
Deflected Mode ◽  
Fine Grained Structure ◽  
Prime Phase

It is known that different parts of the gas turbine engine discs are operated at different temperature and load. Therefore, it is advisable to make such components out of nickel-based superalloys with a regulated structure that provides them the best operational properties. It is important to know the thermomechanical treatment for their processing to form such structures. Research of the deformation behavior and the microstructure evolution of nickel-based superalloys were carried out on small specimens. The accumulated strains and the stress distribution in specimens were determined during simulation. It is possible to predict structure formation on the basis of a deflected mode. Verification was carried out by isothermal upsetting of specimens out of superalloys at the temperature and strain rates determined by simulation. Thermomechanical treatments of the superalloys for different microstructure formation were defined. The features of the microstructure formation are shown depending on the chemical and phase composition of the alloys. Hot deformation of the ATI Allvac 718Plus superalloy leads to dissolution of the gamma prime phase that facilitates the deformation capacity. Increasing the alloyage of superalloys, including rhenium, leads to formation of a necklace structure instead of a homogeneous fine-grained structure for less alloyed superalloys at the same strain.

scholarly journals 10Ghz Charge Pump PLL for Low Jitter Applica-tions

2018 ◽  
Vol 7 (2.12) ◽  
pp. 348
Author(s):  
Rajeshwari D S ◽  
P V Rao ◽  
Ramesh Karmungi
Keyword(s):  
Charge Pump ◽  
Phase Locked Loop ◽  
Frequency Divider ◽  
Differential Delay ◽  
Turn On ◽  
Delay Cell ◽  
Start Up ◽  
Charge Pump Pll ◽  
Low Jitter ◽  
Symmetric Load

This paper presents design and simulation of charge pump architectures for 10GHz Charge Pump Phase locked Loop. Differential delay cell VCO with symmetric load and Programmable frequency divider are efficiently implemented in loop. Able to achieve Peak jitter of the Divider 10ns, Peak jitter of VCO 205ps at 1GHz.Charge pump is analysed in loop by reduced current mismatch using improved high swing cascode structure including start up circuitand it has low turn ON voltage and high ouput impedance to provide stable voltage.Charge pump results current mismatch less than 0.05%.10GHz DPLL is simulated with 65nm techonology, 1.2V and tsmc foundary model files

scholarly journals Calculation of a beam on an inhomogeneous basis

2018 ◽  
Vol 251 ◽  
pp. 04023
Author(s):  
Nikolaj Atarov
Keyword(s):  
Numerical Calculation ◽  
Power Law ◽  
Modulus Of Elasticity ◽  
Strain Energy ◽  
Deformation Modulus ◽  
Bending Moment ◽  
System Of Differential Equations ◽  
Total Potential ◽  
Modulus Of Deformation ◽  
Symmetric Load

The questions of analytical calculating the beam on the base with the modulus of deformation (modulus of elasticity), which is changed by thickness of the layer by power law, was deals in the article. The purpose of work was receiving finite expressions for reactive pressure of the basе on a beam and internal efforts in a beam when using model of the base with two characteristics (coefficient of subgrade resistance). A system of differential equations second-order with respect to the displacements of points the surface of a layer with a continuously changing modulus of elasticity was obtained based on the minimum of the total potential strain energy. The calculation of the rigid beam on the base on the action of the symmetric load was performed and the formulas for the reactive pressures of the base were got. Numerical calculation is executed and the analysis of influence of change of the module of deformation of a layer by the amount of reactive pressure and the bending moment in a beam was given. It is shown that with increase in the module of deformation on layer thickness the basе with two characteristics on nature of work is approaching vinklerovsky.

Study on Mechanical Behavior of Plastic Pipe Reinforced Cross-Winding Steel Wire Subjected to Non-Axis Line Symmetric Surface Load on Soil

2015 ◽  
Vol 750 ◽  
pp. 251-260
Author(s):  
Xiang Li ◽  
Wei Feng Li ◽  
Liu Yun Xu
Keyword(s):  
Mechanical Behavior ◽  
Steel Wire ◽  
Element Model ◽  
Surface Load ◽  
Plastic Pipe ◽  
Steel Composite ◽  
Plastic Matrix ◽  
Symmetric Surface ◽  
Symmetric Load ◽  
Good Agreement

Plastic pipe reinforced by cross helically wound steel wires (PSP) is a new plastic-matrix steel composite pipe developed in China recently. To deeply understand the mechanical properties of buried PSPs, a finite element model of PSP subjected to non-axis symmetric load is proposed. The model is verified by replacing the parameters of PSP by those of steel pipe. A good agreement shows that the model can be used to analyze mechanical behavior of buried PSP. Finally, the influences of internal pressure, properties of soil, geometry parameters of PSP and magnitude of load, etc. are discussed.

scholarly journals Flapping dynamics of an inverted flag

2013 ◽  
Vol 736 ◽  
Author(s):  
Daegyoum Kim ◽  
Julia Cossé ◽  
Cecilia Huertas Cerdeira ◽  
Morteza Gharib
Keyword(s):  
Elastic Strain ◽  
Strain Energy ◽  
Vortex Formation ◽  
Elastic Strain Energy ◽  
Leading Edge ◽  
Bending Stiffness ◽  
Mode Transition ◽  
Fluid Inertia ◽  
Trailing Edge ◽  
Deflected Mode

AbstractThe dynamics of an inverted flag are investigated experimentally in order to find the conditions under which self-excited flapping can occur. In contrast to a typical flag with a fixed leading edge and a free trailing edge, the inverted flag of our study has a free leading edge and a fixed trailing edge. The behaviour of the inverted flag can be classified into three regimes based on its non-dimensional bending stiffness scaled by flow velocity and flag length. Two quasi-steady regimes, straight mode and fully deflected mode, are observed, and a limit-cycle flapping mode with large amplitude appears between the two quasi-steady regimes. Bistable states are found in both straight to flapping mode transition and flapping to deflected mode transition. The effect of mass ratio, relative magnitude of flag inertia and fluid inertia, on the non-dimensional bending stiffness range for flapping is negligible, unlike the instability of the typical flag. Because of the unsteady fluid force, a flapping sheet can produce elastic strain energy several times larger than a sheet of the deformed mode, improving the conversion of fluid kinetic energy to elastic strain energy. According to the analysis of the leading-edge vortex formation process, the time scale of optimal vortex formation correlates with efficient conversion to elastic strain energy during bending.

Analysis of Cylindrical Tanks under the Seismic Load

2016 ◽  
Vol 691 ◽  
pp. 285-296 ◽  
Author(s):  
Norbert Jendzelovsky ◽  
Lubomir Balaz
Keyword(s):  
Seismic Event ◽  
Static Load ◽  
Hydrodynamic Pressure ◽  
The Other ◽  
Seismic Load ◽  
Hydrostatic Load ◽  
Symmetrical Loading ◽  
Cylindrical Tanks ◽  
Symmetric Load ◽  
And Storage

The paper deals with cylindrical tanks. Structures of this type have been used in hydraulic engineering, e.g. water towers, sewerage plant tanks. In recent years, cylindrical tanks have been also used in biogas management as fermentation and storage tanks.While the standard hydrostatic load acts symmetrically, it evokes the rotary symmetric load. During the seismic event, the load acts in one direction only, i.e. in the direction of earthquake. This load imposes a non-symmetrical loading of a structure. By a combination of individual loads the resulting forces are slightly non-symmetrical.Specific tank has been modeled. In one model, the solution is made using the quasi-static load induced by the hydrodynamic pressure according to the standard EC1998, part 4 [12]. The other model is presented as a calculation using the modal and spectral analyses under the seismic load. At the conclusion, these two solutions have been compared.

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