Five Types of Ruled Helical Surfaces for Helical Conveyers, Support Anchors and Screws

Кривошапко, С. Н.; Rynkovskaya, Marina

doi:10.1051/matecconf/20179506002

Cited by 19 publications

(5 citation statements)

References 4 publications

(4 reference statements)

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“…The parameter a is the thickness of the helix. In terms of individual coordinates as follows [25,26]:…”

Section: Jinst 19 P01028mentioning

confidence: 99%

Investigating different geometrical parameters affecting the electric field of cylindrical microdosimeter

Jahanfar,

Tavakoli-Anbaran

2024

J. Inst.

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In order to make a microdosimeter, it is first necessary to investigate the parameters affecting the electric field of the microdosimeter, such as the presence of the helix, the thickness and voltage of the helix, the radius and the number of its rings, as well as the thickness and voltage of the anode, and obtain its optimal conditions. In order to obtain the optimal conditions of the electric field, things such as the possibility of manufacturing, no electric discharge, increasing the intensity of the electric field at a constant voltage, energy resolution, continuity of the electric field with the presence of a helix, and a significant increase in multiplication in a small volume of the microdosimeter around the anode have been considered. Since the presence of the helix complicates the analytical solution of the problem, therefore, using the COMSOL simulation code, we investigated the various parameters of the electric field. Finally, for the cylindrical anode with a height of 25 mm, in optimal conditions; the thickness of the anode was obtained 0.4 mm, a helix with a thickness of 0.6 mm and a radius of 1.5 mm was obtained, which has 9 rings coaxially with the anode. Therefore, the obtained values can be used to make microdosimetry with the geometric dimensions of 25 mm right cylinders, which can investigate microdosimetry sites with different dimensions by changing the pressure of the gas density inside it.

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“…The parameter a is the thickness of the helix. In terms of individual coordinates as follows [25,26]:…”

Section: Jinst 19 P01028mentioning

confidence: 99%

Investigating different geometrical parameters affecting the electric field of cylindrical microdosimeter

Jahanfar,

Tavakoli-Anbaran

2024

J. Inst.

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“…Here, the curvilinear coordinate u (or v = const) is a rectilinear generatrix, tangent to the helical cuspidal edge, but lines v (u = const) are helixes [16]. The surface of the developable helicoid is bounded by the cuspidal edge √ , b is the lead of a helix u = 0, v is an angle measured from an axis Ox, a is a radius of a cylinder on which the helical cuspidal edge is laid [13] (Figure 2).…”

Section: Description Of the Shells Under Studymentioning

confidence: 99%

Modern software capabilities for shape optimization of shells

Ermakova,

Rynkovskaya

2024

Vietnam J. Sci. Technol.

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The article is devoted to the shape optimization of shell structures in Comsol Multiphysics using three gradient-based methods: IPOPT (Interior Point OPTimizer), SNOPT (Sparse Nonlinear OPTimizer) and MMA or GCMMA (the Method of Moving Asymptotes). Two types of complex shapes, such as right helicoid and developable helicoid are taken for the computational experiment. The task is to investigate the initial design and optimization process of two helicoids. To obtain a more accurate result and an interesting design solution, the calculation is carried out using three physics-controlled mesh sizes: extra coarse, fine and extra fine with varying values of special optimization settings, such as maximum displacement (dmax) and filter radius (Rmin). The results obtained using the three methods allow to conclude that the mesh element size and studied parameters dmax and Rmin have a significant impact on the final optimization result.

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“…A last characteristic is the raising factor of the helicoid while rotating, which is set here to 0.25. See, e.g., [14] for geometrical equations fully describing different types of helicoid. The partitioning of the geometry is made along each of its dimensions, as shown in Figure 1, right.…”

Section: Problems and Settingsmentioning

confidence: 99%

Resilient asynchronous primal Schur method

Gbikpi-Benissan¹,

Magoulès²

2022

Appl.Math.

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This paper introduces the application of the asynchronous iterations theory within the framework of the primal Schur domain decomposition method. A suitable relaxation scheme is designed, which asynchronous convergence is established under classical spectral radius conditions. For the usual case where the local Schur complement matrices are not constructed, suitable splittings only based on explicitly generated matrices are provided. Numerical experiments are conducted on a supercomputer for both Poisson's and linear elasticity problems. The asynchronous Schur solver outperformed the classical conjugate-gradient-based one in case of compute node failures.

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Five Types of Ruled Helical Surfaces for Helical Conveyers, Support Anchors and Screws

Cited by 19 publications

References 4 publications

Investigating different geometrical parameters affecting the electric field of cylindrical microdosimeter

Investigating different geometrical parameters affecting the electric field of cylindrical microdosimeter

Modern software capabilities for shape optimization of shells

Resilient asynchronous primal Schur method

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