Wyniki wyszukiwania - BazTech

1

Cutting force prediction of Ti6Al4V using a machine learning model of SPH orthogonal cutting process simulations

Klippel Hagen, Sanchez Eduardo Gonzalez, Isabel Margolis, Röthlin Matthias, Afrasiabi Mohamadreza, Michal Kuffa, Wegener Konrad

Journal of Machine Engineering

|

2022

|

Vol. 22, No. 1

111--123

EN

The prediction of machining processes is a challenging task and usually requires a large experimental basis. These experiments are time-consuming and require manufacturing and testing of different tool geometries at various process conditions to find optimum machining settings. In this paper, a machine learning model of the orthogonal cutting process of Ti6Al4V is proposed to predict the cutting and feed forces for a wide range of process conditions with regards to rake angle, clearance angle, cutting edge radius, feed and cutting speed. The model uses training data generated by virtual experiments, which are conducted using physical based simulations of the orthogonal cutting process with the smoothed particle hydrodynamics (SPH). The ML training set is composed of input parameters, and output process forces from 2500 instances of GPU accelerated SPH simulations. The resulting model provides fast process force predictions and can consider the cutter geometry in comparison to classical analytical approaches.

2

Text-mining-based approach for conductingliterature review of selected meshfree methods

Sindhusuta S., Chi Sheng-Wei, Derrible Sybil

Computer Assisted Methods in Engineering and Science

|

2021

|

Vol. 28, no. 4

265--290

EN

The goal of this study is to review the literature in the field ofmeshfree methodsusing textmining. For this study, the abstracts of around 17330 relevant articles published from 1990to 2020 were collected from Scopus. Text mining techniques such as the latent Dirichletallocation (LDA), along with the calculation of term frequencies and co-occurrence coefficients were used to analyze the text. The study identified a few key topics in the field ofmeshfree methods and helped to see the evolution of the field over the past three decades.Furthermore, the trend in the number of publications and frequency map highlightedresearch trends and lack of focus in certain areas. The co-author network visualizationprovided interesting insights about collaboration between different researchers around theworld. Overall, this study facilitates a systematic literature review in the field of meshfreemethods and provides a broader perspective of the field to the research community.

3

A meshless method using global radial basis functions for creating 3-D wind fields from sparse meteorological data

Pepper D.W., Rasmussen C., Fyda D.

Computer Assisted Methods in Engineering and Science

|

2014

|

Vol. 21, no. 3-4

233-243

EN

An efficient, global meshless method has been developed for creating 3-D wind fields utilizing sparse meteorological tower data. Meshless methods do not require the need for a mesh in order to connect node points. In this study, node points are placed within the computational domain based on topological features. Wind speeds and directions are obtained from a set of instrumented meteorological towers. Inverse weighting is used to initially establish wind vectors at all nodal points. The Kansa technique, employing global basis functions, is then used to create a mass-consistent, 3-D wind field. The meshless method yields close approximations to results obtained with a high-order finite element technique. The method was implemented using MATLAB.

4

A novel forward problem solver based on meshfree method for electrical impedance tomography

Hu G., Chen M., He W., Zhai J.

Przegląd Elektrotechniczny

|

2013

|

R. 89, nr 2a

234--237

EN

In this paper the meshfree method is developed to solve the forward problem for electrical impedance tomography. Differing from finite element method and finite volume method, there is no mesh generation in meshfree method, which is easier to realize and more propitious to be developed as an adaptive procedures for image reconstruction. Numerical simulation results are presented and compared with the results of analytical solution. It is observed that the obtained results are consistent with the results of analytical solution.

PL

W artykule zaproponowano nowa metodę tomograficznej analizy impedancji w której nie generuje się oczek jak na przykład w metodzie elementów skończonych. Dzięki temu uzyskuje się łatwiejsza analizę, w tym także metodami adaptacyjnymi.

5

Essential boundary conditions in meshfree methods via a modified variational principle: Applications to shell computations

Skatulla S., Sansour C.

Computer Assisted Mechanics and Engineering Sciences

|

2008

|

Vol. 15, No. 2

123-142

EN

It has been recognized by many authors that the enforcement of the essential boundary conditions is not an easy task, when it comes to moving least square (MLS)-based meshfree methods. In particular, the modelling of non-linear problems requires high approximation accuracy in order to obtain a solution. This paper addresses the boundary approximation accuracy of MLS-based meshfree methods and shows more specifically its significance with respect to the imposition of essential boundary conditions by the penalty, the Lagrange multiplier method and their combination which results in a modified variational principle. The later is augmented by a stabilization term which uses individual stabilization parameters determined for each numerical integration point by an iteration procedure. This methodology is demonstrated on shell deformations in non-linear structural mechanics involving the Green strain tensor and two different hyper-elastic material laws.

6

Mesh-free approach to Helmholtz equation based on radial basis functions

Kowalczyk P., Mrozowski M.

Journal of Telecommunications and Information Technology

|

2005

|

nr 2

71-74

EN

Recently, a radial basis functions (RBFs) method, which was originally proposed for interpolation problems, has been developed and applied to solve partial differential equations and eigenproblems. Properties of that method (meshfree algorithm) allows one to use it in many areas, including electromagnetics. In this paper the mesh-free RBF method for solving Helmholtz equation was applied and a new adaptive algorithm for defining the set of interpolation centers was proposed. Using the proposed approach the cutoff wavelengths and the field distribution in cylindrical waveguides of arbitrary cross-section were calculated with a high accuracy.