The Experts below are selected from a list of 96 Experts worldwide ranked by ideXlab platform

Mehran Roghani - One of the best experts on this subject based on the ideXlab platform.

  • mechanical behavior and optimization of functionally graded hollow cylinder with an elliptic hole
    Mechanics of Advanced Composite Structures‎, 2020
    Co-Authors: Javad Jafari Fesharaki, Mehran Roghani
    Abstract:

    This paper presents a numerical solution and optimization for a functionally graded Material cylinder with an elliptic hole subjected to mechanical pressure. To obtain the governing equations, an elliptic cylindrical coordinate was used. The Material properties were considered in a way in order to vary with power-law function along the elliptic cylindrical direction. The differential quadrature method was used for solving the equations. In addition, by using von-Misses stress along the thickness, the optimal values for various Material inhomogeneity and the geometry of the cylinder investigated. The results showed that the inconsistency in shape of the hole in the cylindrical vessel can affect the expected results and the stresses in thickness of cylinder were changed. Furthermore, it was shown that with low values of the functionally graded Material Index, the geometry of the cylinder had a more significant effect on von Mises stress. Additionally, with high values for the Material Index, the values for von Misses stress converged together and the Material inhomogeneity had a less noticeable effect on stress. The results also showed that for various geometries of the cylinder and holes, the best value for Material homogeneity to reach the optimum value for von Misses stress was changed. The presented results were consistent with those reported in previous publications.

  • thermo mechanical behavior of a functionally graded hollow cylinder with an elliptic hole
    Journal of The Brazilian Society of Mechanical Sciences and Engineering, 2020
    Co-Authors: Javad Jafari Fesharaki, Mehran Roghani
    Abstract:

    In this paper, the behavior of functionally graded Material hollow cylinders with an elliptic hole under thermal and mechanical loads is investigated. The problem is considered as plane strain condition, and to obtain the governing equations and boundary condition for this complex geometry, an elliptic cylindrical coordinate is used. The Material properties are considered to vary along the elliptic cylindrical direction with power-law function except for the Poisson’s ratio. To solve the two coupled differential equations, differential quadrature method is used. For solving the governing equations, two different boundary conditions are considered for thermal and mechanical loads. The results show that unconventional shape for a hole in the cylinder can affect the results expected such as stresses or displacements, and this information about thermo-mechanical loads can be used for designing the advanced sensors. Also with considering special Material Index, the stress and displacement along the cylinder can be controlled. The presented results in this paper are verified with those reported in the previous publication.

  • Elastic Behavior of Functionally Graded Two Tangled Circles Chamber
    Shahid Chamran University of Ahvaz, 2019
    Co-Authors: Javad Jafari Fesharaki, Mehran Roghani
    Abstract:

    This paper presents the numerical elastic solution for a real problem, functionally graded chamber of hydraulic gear pumps under internal pressure. Because of the similarity and complexity for the considering geometry, a bipolar cylindrical coordinate system is used to extract the governing equations. The Material properties are considered to vary along the two tangled circles with a power-law function. The two coupled governing equations solved by the differential quadrature method. The results are presented for various Material Index and show that the complexity in considering geometry and Material inhomogeneity can change the stress and displacements value through the geometry efficiently. The results and presented method in this paper for extracting and solving the problem can be used for designing similar geometry more accurate. The results of this research are compared with those reported in the previous work

Javad Jafari Fesharaki - One of the best experts on this subject based on the ideXlab platform.

  • mechanical behavior and optimization of functionally graded hollow cylinder with an elliptic hole
    Mechanics of Advanced Composite Structures‎, 2020
    Co-Authors: Javad Jafari Fesharaki, Mehran Roghani
    Abstract:

    This paper presents a numerical solution and optimization for a functionally graded Material cylinder with an elliptic hole subjected to mechanical pressure. To obtain the governing equations, an elliptic cylindrical coordinate was used. The Material properties were considered in a way in order to vary with power-law function along the elliptic cylindrical direction. The differential quadrature method was used for solving the equations. In addition, by using von-Misses stress along the thickness, the optimal values for various Material inhomogeneity and the geometry of the cylinder investigated. The results showed that the inconsistency in shape of the hole in the cylindrical vessel can affect the expected results and the stresses in thickness of cylinder were changed. Furthermore, it was shown that with low values of the functionally graded Material Index, the geometry of the cylinder had a more significant effect on von Mises stress. Additionally, with high values for the Material Index, the values for von Misses stress converged together and the Material inhomogeneity had a less noticeable effect on stress. The results also showed that for various geometries of the cylinder and holes, the best value for Material homogeneity to reach the optimum value for von Misses stress was changed. The presented results were consistent with those reported in previous publications.

  • thermo mechanical behavior of a functionally graded hollow cylinder with an elliptic hole
    Journal of The Brazilian Society of Mechanical Sciences and Engineering, 2020
    Co-Authors: Javad Jafari Fesharaki, Mehran Roghani
    Abstract:

    In this paper, the behavior of functionally graded Material hollow cylinders with an elliptic hole under thermal and mechanical loads is investigated. The problem is considered as plane strain condition, and to obtain the governing equations and boundary condition for this complex geometry, an elliptic cylindrical coordinate is used. The Material properties are considered to vary along the elliptic cylindrical direction with power-law function except for the Poisson’s ratio. To solve the two coupled differential equations, differential quadrature method is used. For solving the governing equations, two different boundary conditions are considered for thermal and mechanical loads. The results show that unconventional shape for a hole in the cylinder can affect the results expected such as stresses or displacements, and this information about thermo-mechanical loads can be used for designing the advanced sensors. Also with considering special Material Index, the stress and displacement along the cylinder can be controlled. The presented results in this paper are verified with those reported in the previous publication.

  • Elastic Behavior of Functionally Graded Two Tangled Circles Chamber
    Shahid Chamran University of Ahvaz, 2019
    Co-Authors: Javad Jafari Fesharaki, Mehran Roghani
    Abstract:

    This paper presents the numerical elastic solution for a real problem, functionally graded chamber of hydraulic gear pumps under internal pressure. Because of the similarity and complexity for the considering geometry, a bipolar cylindrical coordinate system is used to extract the governing equations. The Material properties are considered to vary along the two tangled circles with a power-law function. The two coupled governing equations solved by the differential quadrature method. The results are presented for various Material Index and show that the complexity in considering geometry and Material inhomogeneity can change the stress and displacements value through the geometry efficiently. The results and presented method in this paper for extracting and solving the problem can be used for designing similar geometry more accurate. The results of this research are compared with those reported in the previous work

Manoj Chopra - One of the best experts on this subject based on the ideXlab platform.

  • performance evaluation of two silt fence geotextiles using a tilting test bed with simulated rainfall
    Geotextiles and Geomembranes, 2013
    Co-Authors: Ikiensinma Gogoabite, Manoj Chopra
    Abstract:

    Abstract This paper presents the results of the investigation of the performance efficiencies of silt fence fabrics in turbidity and sediment concentration removal, and the determination of flow-through-rate on simulated construction sites in real time. Two silt fence fabrics, (1) a woven type and (2) a nonwoven type, were subjected to Material Index property tests and a series of field-scale tests. The fabrics were tested for removal efficiency by varying the rainfall intensities and events for different embankment slopes on a tilting test-bed. Collected influent and effluent samples were analyzed for sediment concentration and turbidity, and the flow-through-rate for each fabric was evaluated. Test results revealed that the woven and nonwoven silt fence achieved 14 and 52 percent average turbidity reduction efficiency, and 23 and 56 percent average sediment concentration removal efficiency, respectively. Evaluation of sediment concentration reduction based on percent removal does not correctly account for the sediment concentration transported and deposited downstream. Fabric flowrates were functions of the rainfall intensity, embankment slope and field conditions, and fluctuates with every rainfall event.

Ikiensinma Gogoabite - One of the best experts on this subject based on the ideXlab platform.

  • performance evaluation of two silt fence geotextiles using a tilting test bed with simulated rainfall
    Geotextiles and Geomembranes, 2013
    Co-Authors: Ikiensinma Gogoabite, Manoj Chopra
    Abstract:

    Abstract This paper presents the results of the investigation of the performance efficiencies of silt fence fabrics in turbidity and sediment concentration removal, and the determination of flow-through-rate on simulated construction sites in real time. Two silt fence fabrics, (1) a woven type and (2) a nonwoven type, were subjected to Material Index property tests and a series of field-scale tests. The fabrics were tested for removal efficiency by varying the rainfall intensities and events for different embankment slopes on a tilting test-bed. Collected influent and effluent samples were analyzed for sediment concentration and turbidity, and the flow-through-rate for each fabric was evaluated. Test results revealed that the woven and nonwoven silt fence achieved 14 and 52 percent average turbidity reduction efficiency, and 23 and 56 percent average sediment concentration removal efficiency, respectively. Evaluation of sediment concentration reduction based on percent removal does not correctly account for the sediment concentration transported and deposited downstream. Fabric flowrates were functions of the rainfall intensity, embankment slope and field conditions, and fluctuates with every rainfall event.

Pavel Chebe - One of the best experts on this subject based on the ideXlab platform.

  • high extinction ratio and broadband silicon te pass polarizer using subwavelength grating Index engineering
    IEEE Photonics Journal, 2015
    Co-Authors: Yule Xiong, Jens H Schmid, Pavel Chebe
    Abstract:

    We propose and experimentally demonstrate a novel approach to implement a low-loss, broadband, and compact transverse electric (TE)-pass polarizer on a silicon-on-insulator platform. The TE-polarizer utilizes a subwavelength grating (SWG) structure to engineer the waveguide equivalent Material Index. In this paper, the SWG-based polarizer only supports its fundamental TE mode, whereas the transverse magnetic (TM) mode is suppressed under the cutoff condition, i.e., the TM mode leaks from the waveguide with low reflection. The simulations predict that the bandwidth to achieve a polarization extinction ratio (ER) of 35 dB exceeds 200 nm. Experimentally, the measured polarization ER is ∼30 dB, and the average insertion loss is 0.4 dB in the wavelength range of 1470–1580 nm. The fabricated TE-polarizer has a compact length of 60 $\mu\textrm{m}$ .