# Computational Engineering – Science topic

Explore the latest articles, projects, and questions and answers in Computational Engineering, and find Computational Engineering experts.
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Journals having a decent impact factor score, not too high though
Journal finder is best tool to select the best journal however its better to select a journal first and then write the paper.
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I am building an NMOS using the devedit Tcad software in silvaco. I would like to know if there is a way to get IV curves using devedit or how to call the atlas function in devedit. Thank you
Can anybody help me? I make a textured structure in Devedit but when meshing it goes! I changed the min and max height and width several times but I couldn't solve it
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As a simple example, I would like to implement a Kalman-Filter in a level 2 m-file s-function. Because of this, I need a covariance matrix P, which will be updated at every time step (so, the matrix of the last timestep is also needed). It would be self-evident to use a DWork variable for this. But the DWork variable cannot be defined as a matrix. Do you have any ideas how a matrix can be implemented in a s-function as a DWork-like structure?
Be careful when using Dwork vector for saving 2D-array after reshaping it into vector. Because if you choose the Dwork vector length to be equal to the total number of elements in the 2D-array. Next, you reshape the 2D-array into vector. After that, you save the "vectorized" 2D-array into the Dwork vector. Then for unknown reason, the Dwork vector will save only half of the 2D-array elements. This will be the case no matter what you try! But fortunately, after long effort of trial and error, I found solution for this problem. Simply by choosing the length of the Dwork vector to be double...more
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Here, I am trying macro modeling of infilled frame in DIANA, to check whether my interface element (CSC model) between infill and frame is working or not. But stress distribution looks uniform for whole panel as shown in attached document. Can anyone please help me to find problem and solution for this.
It is not a problem actually, if you used a zero thickness interface elements between frame and infill wall. If those elements are in compression, obviously there is wall to frame penetration, because thickness is zero but stiffness is not infinite.
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I am attempting to simulate a triaxial test in ABAQUS/Standard using the clay plasticity model in the ABAQUS material database. I am using a 3-D cylindrical specimen which contains a single element (3D stress - C3D10). For my initial BCs, I applied a zero-displacement BC in the vertical direction on the bottom of the specimen. My first step is a geostatic step, in which I apply the confining pressure. In my second step, I apply a pressure at the top of the specimen. The geostatic step converges in a single increment, which tells me my initial stress is correct. For my second step, I... more
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Dear all I want to modeling the direct shear test using FLAC2D. I therefore need to write a fIsh function to obtain horizontal displacement and shear stress?
I want to change normal and shear stiffness on the interface as following: def change_stif _ip=i_node_head(i_head) loop while _ip # null _value_kn=10e7 _value_ks=3*_value_kn ;shear stiffness (Pa/m) in_prop(_ip,'kn')=_value_kn in_prop(_ip,'ks')=_value_ks _ip=in_next(_ip) end_loop end But it gets error: "Property does not match model" Can you help me to resolve? Thanks in advance.
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Hi all, I am trying to model temperature gradient focusing via joule heating. Electric current was applied at a micro-channel filled with electrolyte. The current then induced joule heating, an electrophorectic flow and electroosmosis opposing each other. Due to the temperature dependent material properties of the electrolyte, a high concentration region would be created. In comsol, I used electric currents (ec), creeping flow(spf), heat transfer in fluid (ht), transport of diluted species (chds) and joule heating. Everything went fine until I introduced a Poisson equation to solve for... more
How can we put a cubic function in comsol? Hello every one ,Can any one please help me to put this equation in comsol?d(dp^3)/dt)+div(...*dp^3)= sources Thank you very much for your helps Sincerly,
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and also do negative or complex eigenvalues have meaning in a buckling analysis?
As far as I see, it has no direct way to avoid the unsymmetry via integration by parts (only switches the derivative from the solution function to the test function). It remember me the cases with weak formulation of non-self-adjoint systems e.g. advection-diffusion problems (e.g. -u'' + ku' = 0). But, I am not an expert on that, however if you need some direction try to ask to experts in Discontinuous Galerkin as well as who uses UMFPACK. After, if possible give us here some feedback.
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According to the User subroutine Abaqus manual, "If thermal expansion is included in the same material definition, the strains passed into UMAT are the mechanical strains only (that is, the thermal strains computed based upon the thermal expansion coefficient have been subtracted from the total strains)." -quoted as in manual. So what happens if I don't include Thermal co-efficient in the material definition. What will Abaqus provide me in the STRAN and DSTRAN variable if there is a temperature change included in the analysis?
I think you are right. Without any mechanical loading I am getting DSTRAN value. I have just assigned initial temperature and thermal expansion coefficient. Then cooled it to room temperature.
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Dear Researchers, I would be grateful if someone could tell me how to assign a S9R5 element to a shell plate in Abaqus software and thank you beforehand ! Best wishes, Smail.
Using the pyton code in the website below you can convert your S8R5 elements to S9R5. https://github.com/sniis84/gen-abq-S9R5
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I am doing response spectrum analysis on a water tank. I need to find out base shear, overturning moment, story drift and lateral displacements. After analyzing, SAP2000 does not give these results directly. So, using the available results, how can I obtain the required parameters?
hello, is this usuful for you?
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What kind of constraint should be apply to the edges?
Hello Marcin Gajewski Sir, How to calculate the cohesive elements parameters, Also how to calculate the traction values like E/Enn, G1/Ess and G2/Enn ? Please help me. Right now I am starting my work on CZM.
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I am using HEC RAS (Though it is a river analysis software) to an urban area to connect various ponds and lakes in the city and perform flood inundation mapping. What is the suitable analysis.Whether steady flow or unsteady flow. I am assuming that there is precipitation through out the area and would like to map flood inundation for a specific rainfall event. Can anyone please suggest me on this. Thank you V.Swathi
https://www.researchgate.net/publication/294089869_Assessing_flood_inundation_extent_and_landscape_vulnerability_to_flood_using_geospatial_technology_A_study_of_Malda_district_of_West_Bengal_India
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I want to model the moving mass (not vehicle) in sap 2000, Can anyone help me?
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Hi, I have drawn a 3D sketch using SolidWorks and created lofted surfaces from this. I have then imported this geometry into APDL and meshed it. Once loaded I am getting gaps where it is obvious the elements for each section of the lofted surface do not join. Is there a way I can either join these surfaces before they are meshed, or join the elements after it is meshed? I have tried to glue these surface areas but that has not worked. I have also done various techniques such as knit in SolidWorks before importing. Any help would be appreciated, please also note I have been using the... more
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I am unable to find data sets with all positive values from UCI. Values can be fraction but not negative. Thanks
I require datasets number of instances(ROWS) more then 10K. Further positive values means positive values of attributes. Thanks
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I am totally fresh for using Python Script for ABAQUS, I saved a table of data about stress as txt in my drive, how can I import this datafile into abaqus material properties?
Just copy the material properties from the text file or excel file one column at a time or whole data but in the correct column order that Abaqus needs.  Just copy and paste will work.
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I am intending to calculate the energy dissipation during the 1st cycle of loading. i have attached the excel sheet which gives details for the 1st cyle of loading. i will be grateful if anyone can help me to find out the area under the hysteresis curve.
u can use excel....
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using HFSS for simulating of FSS dual bandstop filter (0.9 and 1.8 GHz), a Floquet-Port needs to be assigned at an appropriate height over the surface. How much is that height supposed to be? and how can I be so sure of the results if any small change in this height dramatically changes the results?? what should be the Deembed distance? and what is the value of Solution Frequency in the Driven  Solution Setup?
The distance between floquet port and the FSS is not a function of the frequency. but make sure that both the ports are at same distance from the FSS. I maintain a spacing of 30mm.
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What type of convergence characteristics does it possess?
Thank you.
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In terms of post processing software capabilities, stability, performance, user interface etc. TSL OIM or Oxford HKL 5 or Bruker's Espirit (Quantax)?
Hi, it would be more beneficial if you can provide more information about the material types you plan to analyze, which kind of analysis and information you want to extract from the raw data. As mentioned, there is no single correct answer. I have 8+ years of experience with the TSL-OIM and 1.5+ years experience with the Oxford systems. I have no experience with Bruker. Comparing TSL-OIM and Oxford in terms of: software capabilities: TSL is much better, although the OIM software has many options, when you get used to it, you start to understand the basics better and extract more...more
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I have a series of 10,000 (X,Y) points and I can represent them in Excel with a Scatter plot. However, I need to obtain their probability contour curves (which would correspond to the Z axis values), but I need a software that calculates them for me, since I don't even know the Z values. On top of that,f that software, or add-in was easy to use and free, it would be highly appreciated. Thank you.
Dear all, thank you you for your answers. The problem is that I am not an R user, not a Matlab or similar. I need something that either works as a standalone component or it is an Excel complement. I cannot learn a new software just to draw a density plot. thanks, pablo
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Hello! I've modeled a simple wing box with some spars and ribs in Ansys APDL. I chose SHELL181 for all the elements. My first natural mode of vibration is bending, but then I get local modes for all the other frequencies instead of the expected torsion and bending modes. I've tried to play with the thickness but I could not improve the results. Does anyone knows why I am getting such results and how to prevent this? Thanks a lot.
Thank you Dr. Khulief.
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How to decide the below or above resonance and what material for the particular frequency??? Which software is better for this???
I want to design Passive Isolator using Ferrite.....
Tarasankar Debroy
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Article
Since its inception, significant progress has been made in understanding additive manufacturing (AM) processes and the structure and properties of the fabricated metallic components. Because the field is rapidly evolving, a periodic critical assessment of our understanding is useful and this paper seeks to address this need. It covers the emerging research on AM of metallic materials and provides a comprehensive overview of the physical processes and the underlying science of metallurgical structure and properties of the deposited parts. The uniqueness of this review includes substantive...
Project
Goal: Develop suites of high performance computing physics-based software applications that enable engineers to reduce the risks, time, and costs of physical systems (e.g. ships, air craft, land vehicles,...).
Osama Mohammed Elmardi Suleiman Khayal
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I am doing response spectrum analysis on a water tank. I need to find out base shear, overturning moment, story drift and lateral displacements. After analyzing, SAP2000 does not give these results directly. So, using the available results, how can I obtain the required parameters?
hello, is this usuful for you?
Anastas Ivanov Ivanov
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The relative motion of an arbitrary asymmetrical rigid body in this article is studied. Three new additional kinematic characteristics are defined, namely, vectors-real absolute, transmissive and relative generalized velocity. A new theorem for summation of the rigid body real generalized velocities with these new additional kinematic characteristics is formulated. Using the final differential equations of absolute rigid body motion, which have been obtained in previous author's articles, the differential equations describing the rigid body relative motion in a matrix form is obtained....
Project
Goal: Consulting for industrial application in design, manufacturing, virtual testing and use in, e.g., - transport vehicle industry - building industry - biomechanical fields
Dragan Ribarić
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Research
Goal: A research project is in basic technical sciences concerning the numerical analysis of the Mindlin type moderately thick plates and shells by the finite element method. Given our good results in designing quadrilateral and the triangular plate elements (with various number of nodes) by the assumed strain interpolation in the element stiffness formulation, we want to extend our research to the layered plates in 2D space and the layered facet or curved shells in 3D space. The material connecting the layers will be modeled at first with a simple elastic constitutive law, but following...
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Hi, I have drawn a 3D sketch using SolidWorks and created lofted surfaces from this. I have then imported this geometry into APDL and meshed it. Once loaded I am getting gaps where it is obvious the elements for each section of the lofted surface do not join. Is there a way I can either join these surfaces before they are meshed, or join the elements after it is meshed? I have tried to glue these surface areas but that has not worked. I have also done various techniques such as knit in SolidWorks before importing. Any help would be appreciated, please also note I have been using the... more
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Anastas Ivanov Ivanov
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The absolute motion of an arbitrary asymmetric rigid body is studied. This motion is determined after its relative motion has been obtained. The most important peculiarity in this dynamical rigid body model is that the selected pole does not coincide with its mass center. Seven new kinematic characteristics have been defined. The first ones are the following vectors: real absolute, transmisive and relative generalized velocities. The second ones are the vectors-real absolute, transmisive, relative and Coriolisian generalized accelerations. Two new theorems are formulated. The first one is...
Project
Goal: I am writing a book covering the breadth of computational engineering for structural engineer students and graduates for the Institution of Structural Engineers. This will include analysis, design, parametrics, optimisation, BIM, and thoughts about the future of digital structural engineering.
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Conference Paper
Dike infrastructure is of vital importance for the safety against flooding. The standard methodologies for the assessment of dike safety for macrostability are based on limit equilibrium methods, which result in a safety factor against shear failure. The more advanced alternative consists of using finite element method to compute the safety factor against shear failure. However, these approaches do not take into account the capacity of the dike to retain water, but are only concerned with the mechanical equilibrium of the dike's initial composition. With the recent advancements in the...
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Hi, I am using ANSYS APDL for modelling a bridge under flood hazard. I am stuck at a point where I am unable to feed the flood load in terms of the flood velocity without actually calculating the flood load for each and every velocity values as given in AS 5100 formulas. One of my friend told that I can create some macros in ANSYS APDL and thereby feed velocity values straight way without calculating the flood load repeatedly for different flood velocity values. Can someone please help me? For instance the code defines the flood force as below F = 0.5 Cd * V^2 * As. I am trying to create a... more
Are you looking for making a loop so that you "automate" calculating the flood load per each velocity..etc? If that's what you want, either create loops ( like *do loop) inside the APDL or create a macro, indeed, inside the apdl ( like the segment you want to repeat, start with "macro" ...put your code, then "end macro". OR you can save the macro code into a separate file and call for it. On either situation there is no escaping from making *do, loops inside the apdl. You can also look at this document:  http://ansys.net/ansys/tips/week_28_totw-macros.pdf
Juliana Javorova
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Article
In this paper the trajectories of a soccer ball for the most important kicks in the football game - a corner kick and a direct free kick are studied. The soccer ball is modeled as an ideal rigid hollow spherical body with six degrees of freedom, which performs a general motion in an immovable air environment with constant parameters. The ball 3D orientation is determined by the three Cardan angles. The aerodynamic forces and moments with which the air environment acts to the ball are taken into account. Two of the most dangerous areas of the football goal are defined. Differential...
Project
Goal: Volume 1, Issue 1, Winter 2018, Page 1-93
Osama Mohammed Elmardi Suleiman Khayal
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Patent
Dear Dr. Osama Mohammed Elmardi Suleiman, Thank you for supporting our journal with your valuable submission. I am delighted to inform you that your Manuscript “Performance and Design Optimization of Solar Powered Stirling Engine Using Genetic Algorithm” accepted for further Evaluation Process. Please refer below ID for your future communication with our Editorial Offices. Manuscript ID: AJES-18-RA-501 Also, there will be the nominal charges (to incur web hosting charges) towards publication of your manuscript in our journal. Once again, thank you very much for your submission to the...
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Hi all, I am trying to model temperature gradient focusing via joule heating. Electric current was applied at a micro-channel filled with electrolyte. The current then induced joule heating, an electrophorectic flow and electroosmosis opposing each other. Due to the temperature dependent material properties of the electrolyte, a high concentration region would be created. In comsol, I used electric currents (ec), creeping flow(spf), heat transfer in fluid (ht), transport of diluted species (chds) and joule heating. Everything went fine until I introduced a Poisson equation to solve for... more
How can we put a cubic function in comsol? Hello every one ,Can any one please help me to put this equation in comsol?d(dp^3)/dt)+div(...*dp^3)= sources Thank you very much for your helps Sincerly,
Bohayra Mortazavi
added a Preprint related to Computational Engineering
Preprint
In this short communication, we conducted first-principles calculations to explore the stability of boron monochalcogenides (BX, X = S, Se or Te), as a new class of two-dimensional (2D) materials. We predicted BX monolayers with two different atomic stacking sequences of ABBA and ABBC, referred in this work to 2H and 1T, respectively. Analysis of phonon dispersions confirm the dynamical stability of BX nanosheets with both 2H and 1T atomic lattices. Ab initio molecular dynamics simulations reveal the outstanding thermal stability of all predicted monolayers at high temperatures over 1500...
Project
Goal: To develop innovative shape memory polymer cmposites (SMPC), elastic memory composite (EMC), mechancial constitutive model and behavior investigations, and interdiciplinary adaptive structure and mechanism in spacecraft, robotics, manupulators, etc.
Ren
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Conference Paper
We propose a study of primal and dual Steklov-Poincaré approaches for the data completion problem in linear elasticity. After giving elementary properties of the discretized operators, we investigate the numerical solution with Krylov solvers. Different preconditioning and acceleration strategies are evaluated. We show that costless filtering of the solution is possible by post-processing Ritz elements. Assessments are provided on a 3D mechanical problem.
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According to the User subroutine Abaqus manual, "If thermal expansion is included in the same material definition, the strains passed into UMAT are the mechanical strains only (that is, the thermal strains computed based upon the thermal expansion coefficient have been subtracted from the total strains)." -quoted as in manual. So what happens if I don't include Thermal co-efficient in the material definition. What will Abaqus provide me in the STRAN and DSTRAN variable if there is a temperature change included in the analysis?
I think you are right. Without any mechanical loading I am getting DSTRAN value. I have just assigned initial temperature and thermal expansion coefficient. Then cooled it to room temperature.
Vinh Phu Nguyen
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Article
Being able to seamlessly deal with complex crack patterns like branching, merging and even fragmentation, the phase-field model, amongst several alternatives, is promising in the computational modeling of dynamic fracture in solids. This paper presents an extension of our recently introduced phase-field cohesive zone model for static fracture to dynamic fracture in brittle and quasi-brittle solids. The model performance is tested with several benchmarks for dynamic brittle and cohesive fracture. Good agreement is achieved with existing findings and experimental results; and particularly...
Chukwuemeke William Isaac
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Article
This paper numerically investigates the structural response and crashworthiness performance of a hexagonal thin-walled grooved tube subjected to axial and oblique impact loading conditions. First, an analytical formulation that estimates the mean crushing force and total energy absorption are obtained for both hexagonal and circular tubes subjected to high dynamic impact loading conditions. The solutions of the analytical model are used to verify and compare the approximate solutions of the finite element model. The inclusion of grooves to the conventional hexagonal thin-walled tubes shows...
De-Cheng Feng
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Article
A phase-field regularized cohesive zone model (CZM) was recently proposed for both brittle fracture and cohesive failure within the framework of the unified phase-field damage theory. Motivated from the fact that this model gives length scale and mesh independent global responses for problems with or without elastic singularities, we further apply it in this work against the size and boundary effects of concrete under both mode-I and mixed-mode failure. More specifically, for the two independent experimental campaigns of three-point bending notched and unnotched concrete beams under mode-I...
Project
Goal: 1 composite mechanic model and multiscale solution methods 2 strucural dynamic theroy and application 3 computational solid mechanics
Domenico Altieri
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Conference Paper
Conditional reliability measures provide a more detailed description of the performance of a system, being representative of different initial configurations. Commonly, since the failure region is characterised by a small probability of occurrence, advanced sampling techniques are required to reduce the computational effort of a simulation based approach. These techniques if on one hand decrease the number of samples needed to identify the failure domain, on the other hand do not generally allow a direct estimation of the conditional failure probability for different given inputs. This...
Federico Ferrari
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Article
The article presents an efficient solution method for structural topology optimization aimed at maximizing the fundamental frequency of vibration. Nowadays this is still a challenging problem, mainly due to the high computational cost required by spectral analyses. The proposed method relies on replacing the eigenvalue problem with a frequency response one, which can be tuned and efficiently solved by a multilevel procedure. Connections of the method with multigrid eigenvalue solvers are discussed in details. Several applications demonstrating more than 90% savings of the computational...
S. Jamaleddin Mousavi
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Weiwei Xing
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Article
This paper proposes a new node-to-node (NTN) scheme for modeling two-dimensional contact problems within a scaled boundary finite element method (SBFEM) framework. The analysis is formulated and solved directly as a mathematical programming problem known as a mixed complementarity problem (MCP). Polygon elements with arbitrary number of edges and nodes are constructed in the SBFEM modeling. Only the edges of these polygon elements are discretized thereby accommodating highly non-uniform discretization. Non-matching meshes are easily converted into matching meshes by appropriate node...
Project
Goal: We investigated the structure and the dynamics of SrHPO4 and BaHPO4 by using XRD, NPD, INS and QENS.
Guobiao Hu
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Article
Phononic crystals and metamaterials have been widely investigated over the last decade. In recent years, by integration with piezoelectric transducers, phononic/metamaterial-based piezoelectric energy harvesters (PEHs) have gained increasing research interest for achieving multifunctionalities. This paper proposes a general framework for modelling phononic/metamaterial beams bonded with piezoelectric transducers based on a one-dimensional piezoelectric composite finite element derived using the generalized Hamilton’s principle. A method for calculating band structures of infinitely long...
Pengfei Tan
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Article
This paper develops a three-dimensional (3D) isogeometric analysis (IGA) and meshfree coupling approach to investigate the static, dynamic and buckling behaviors for plates and shells of functionally graded material (FGM). The meshfree method and IGA are coupled using the higher-order consistency condition in the physical domain so that the higher-order continuity of basis functions is guaranteed, and the topological complexity of the global volumetric parameterization for IGA to build the 3D geometry can be overcome. By employing IGA elements on the domain boundary and meshfree nodes in...
Jakub Kružík
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Chapter
This paper deals with the novel PermonSVM machine learning tool. PermonSVM is a part of our PERMON toolbox. It implements the linear two-class Support Vector Machines. PermonSVM is built on top of PermonQP (PERMON module for quadratic programming) which in turn uses PETSc. The main advantage of PermonSVM is that it is parallel. The parallelism comes from a distribution of matrices and vectors. The MPRGP algorithm, implemented in PermonQP, is used as a solver of the quadratic programming problem arising from the dual SVM formulation. The scalability of MPRGP was proven in problems of...
Nicos Makris
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Chapter
The uplifting and rocking of slender, free-standing structures when subjected to ground shaking may limit appreciably the seismic moments and shears that develop at their base. This high-performance seismic behavior is inherent in the design of ancient temples that consist of slender, free-standing columns which support freely heavy epistyles together with the even heavier frieze atop. While the ample seismic performance of rocking isolation has been documented with the through-the-centuries survival of several free-standing ancient temples; and careful post-earthquake observations in...
Alexander Lagerev
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Book
The wide range of questions of optimum design of designs of lifting and transport equipment is considered: the choice of optimum parameters of standard details, mechanisms, bearing a metalwork, kinematic schemes, materials. Modern numerical methods for solving optimization problems are considered, the source codes of the corresponding algorithms are given. Chapter 1. Optimization of machines and structures of lifting and transport equipment. Optimization methods for solving engineering problems. Optimization in the practice of design and modernization of lifting and transport...
Arnab Banerjee
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Article
Wave propagation through a structured medium has attracted the attention of researchers for centuries due to its relevance to problems in condensed matter physics, chemistry, optics, phononics, composite, acoustics and mechanics. Wave containing certain band of frequencies can either propagate, known as transmission, or attenuated, known as attenuation band. This band structure for a continuum and its equivalent lumped spring mass model are not identical, although continuum medium is often modelled as a chain of discrete periodic structures because the continuous and discrete is depends on...
Alexander Lagerev
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Book
The issues related to the calculations of metal structures of hoisting machines for strength and stiffness by the finite element method based on the specialized computational complex of MSTU and the universal computational complex NX Nastran are considered.
Osama Mohammed Elmardi Suleiman
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Book
strength of materials By G. H. Ryder
Will Hawkins
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Conference Paper
Buildings are being constructed at ever faster rates, fuelled by population growth and urbanisation. The total worldwide floor area of buildings is expected to almost double over the next 40 years, the equivalent of constructing Paris every five days [1]. The majority of the mass and embodied energy (60% to 70%) in a typical multi-storey building structure exists within the floors [2], making these a primary target for sustainable structural design. In a typical reinforced concrete slab, much of the concrete is assumed to be cracked and therefore not structurally utilised, but nevertheless...
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Article
EasyPBC is an ABAQUS CAE plugin developed to estimate the homogenised effective elastic properties of user created periodic representative volume element (RVE), all within ABAQUS without the need to use third-party software. The plugin automatically applies the concepts of the periodic RVE homogenisation method in the software’s user interface by categorising, creating, and linking sets necessary for achieving deformable periodic boundary surfaces, which can distort and no longer remain plane. Additionally, it allows the user to benefit from finite element analysis data within ABAQUS CAE...
Amin Kazemi
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Hitoshi Gotoh
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Article
The article aims at providing an up-to-date review on several latest advancements related to particle methods with applications in coastal and ocean engineering. The latest advancements corresponding to accuracy, stability, conservation properties, multiphase multi-physics multi-scale simulations, fluid-structure interactions, exclusive coastal/ocean engineering applications and computational efficiency are reviewed. The future perspectives for further enhancement of applicability and reliability of particle methods for coastal/ocean engineering applications are also highlighted.
Alexander Lagerev
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Book
A wide range of issues related to various aspects of the problem of modeling of working processes, improving the quality and efficiency of operation of multi-drive conveyors - powerful belt conveyors with several concentrated drives and conveyors with suspended load-carrying tape and distributed drive in the form of a significant number of drive suspensions. Mathematical models of dynamic processes occurring during the operation of conveyors with a hanging-carrying belt and distributed drive normally and if you have specific failures, estimation of the influence of constructive and...
Gili Sherzer
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Chapter
The mechanical response of concrete is complex and as other composite materials, multiscale modelling has the potential for modeling its macroscopic behavior. This paper presents an upscaling methodology for the modelling of the concrete mechanical properties. The suggested formulation starts from a known chemical and mechanical set of parameters of the cement paste, which are used to evaluate the mechanical properties of the LDPM (Lattice Discrete Particle Model) concrete mechanical parameters. The parameters are divided to groups, which are related to different damage modes such as: pore...
Osama Mohammed Elmardi Suleiman Khayal
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Conference Paper
The purpose of this research is to study the possibility of using water power to drive a hydraulic turbine installed in the drinking water pipeline emerging from a dam. The dam is constructed in the Red Sea state by the Dams Implementation Unit Kaleidoscope to solve water supply problem by harvesting and storing rainwater. In this study the required data is collected from the site of the dam and analyzed in terms of hydrological and topographic studies. Using this data, the flow rate of water through the pipe is estimated by applying the energy equation using Excel program analysis. Given...
Nicos Makris
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Conference Paper
This paper derives the causal time-response functions of three-parameter mechanical networks that have been reported in the literature and involve the inerter—a two-node element in which the force-output is proportional to the relative acceleration of its end-nodes. It is shown that all frequency-response functions that exhibit singularities along the real frequency axis need to be enhanced with the addition of a Dirac delta function or with its derivative depending on the strength of the singularity. In this way the real and imaginary parts of the enhanced frequency response functions are...
Howard Smith
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Article
The design of aircraft has evolved over time from the classical design approach to the more modern computer-based design method utilizing multivariate design optimization. In recent years, aircraft concepts and configurations have become more diverse and complex thus pushing many synthesis packages beyond their capability. Furthermore, many examples of aircraft design software focus on the analysis of one particular concept thus requiring separate packages for each concept. This can lead to complications in comparing concepts and configurations as differences in performance may originate...
Jian-Ying Wu
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Article
Recently several non-standard phase-field models have been proposed for the modeling of damage and fracture in solids, greatly extending scopes of the standard one applicable only for brittle fracture (Bourdin et al., 2000, 2008). However, it is a great challenge to solve the resulting discrete governing equations, since the classical numerical algorithm for standard phase-field models either does not apply or is not robust enough. In this work, the numerical implementation of the unified phase-field/gradient-damage model (Wu, 2017a, 2018) is addressed, though it also applies to the...
added a Conference Paper related to Computational Engineering
Conference Paper
The tectonic depression, which occurred in the Dinarides during the Miocene, caused the formation of the freshwater lakes and travertine limestone. It is interesting in terms of research and exploitation of architectural and building stone, as they have been exploitedand used since ancient times on the territory of Bosnia and Herzegovina (B&H).Thetradition of building with fresh water (lake) limestone in B&H is long, especially constructionwith "tenelija" and "miljevina (mudstone)", which are easily processed (especially in the presents of natural moisture), but they are not polished and...
Osama Mohammed Elmardi Suleiman Khayal
added a Book related to Computational Engineering
Xu Chen
added an Article related to Computational Engineering
Siegfried Schmauder
added a Poster related to Computational Engineering
Poster
Flyer for 28th International Workshop on Computational Mechanics of Materials (IWCMM 28)
Xu Chen
added an Article related to Computational Engineering
Pooya Alaee
added an Article related to Computational Engineering
Article
Analytical investigations were carried out on high-strength concrete beam–column joints reinforced with high-strength steel rebars. The bond performance of test specimens was evaluated and compared with building code provisions. An analytical approach was obtained to study the influence of various patterns of column axial loading on the failure mechanism of beam–column joint subassemblies. In addition, a finite-element study was conducted to investigate the seismic behavior of reinforced concrete beam–column joints designed with high-strength materials. A novel recommendation for the joint...
Alexander Lagerev
added a Book related to Computational Engineering
Book
The methods and generalized recommendations for modeling dynamic loading of load-bearing elements of steel structures of three-tier hydraulic cranes-manipulators are considered. Mathematical models have been developed to study the dynamics of moving elements of the crane-manipulator, the movement of the load-lifting machine on a stochastic uneven surface with a suspended load. The presented approaches can be used to calculate other types of jib cranes equipped with hydraulic drive. Chapter 1. Modern approaches to the design of cranes. Construction of cranes-manipulators. Operating...
Stephen Kirkup
added an Article related to Computational Engineering
Article
The Boundary Element Method is developed in its most simple form; for the solution of Laplace's equation in an interior domain with a straight line approximation to the boundary. The direct and indirect approaches to the boundary element method are included. The methods are developed in Freemat, a language similar to Matlab. The codes for the solution of Laplace's equation in a general domain with a general (Robin) boundary condition are developed. The codes are applied to a typical test problem. The codes are made available as open source and can be downloaded from...
Alexander Lagerev
added a Book related to Computational Engineering
Book
The publication considered a wide range of issues related to the design and operating conditions of modern manipulation systems of mobile transport and technological machines. Chapter 1. Design of modern handling systems of mobile transport and technological machines. Design of manipulation systems. Design and performance of the main components of the handling systems of mobile transport and technological machines. Comparative analysis of structures and technical characteristics of handling robots and handling systems of mobile transport and technological machines. Chapter 2. Operating...
Roberto Aguiar
added an Article related to Computational Engineering
Article
RESUMEN Para el análisis no lineal de estructuras, es necesario conocer el diagrama momento-rotación o el diagrama momento-curvatura, para las vigas y columnas de hormigón armado o de acero y para las diagonales rigidizadoras se necesita conocer el diagrama fuerza-desplazamiento. El ASCE 41 de 2011, proporciona tablas que facilitan el cálculo de estos diagramas, las mismas que se presentan en este artículo, con ejemplos desarrollados, manualmente. Entre los ejemplos se presenta una estructura de 4 pisos de hormigón armado y una estructura de acero de 6 pisos; en las dos, se tiene...
Alexander Lagerev
added a Book related to Computational Engineering
Book
The book discusses the types of operating in the lifting and transport, construction, road machines, equipment and load systems, patterns of their application and changes in time, approaches and engineering methods of their experimental and simulation, calculation and presentation in the design of equipment. Chapter 1. Operational loads on the construction of lifting and transport equipment. The load of the weight. Dynamic load. Wind load. Climatic influence. Design combinations of loads in the design of cranes. Loading diagrams of cranes and crane mechanisms. Equivalent load. Chapter 2....
Mahmood A Rashid
added an Article related to Computational Engineering
Article
Protein structure prediction (PSP) is computationally a very challenging problem. The challenge largely comes from the fact that the energy function that needs to be minimised in order to obtain the native structure of a given protein is not clearly known. A high resolution 20 × 20 energy model could better capture the behaviour of the actual energy function than a low resolution energy model such as hydrophobic polar. However, the fine grained details of the high resolution interaction energy matrix are often not very informative for guiding the search. In contrast, a low resolution...
Alexander Lagerev
added a Book related to Computational Engineering
Book
The issues related to the calculations of stress-strain state of metal structures of hoisting machines and welded joints by the finite element method based on the specialized computational complex of MSTU and the universal computational complex NX Nastran are considered.
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