Engineering with Computers

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Object-Oriented Approach to Hyperelasticity
Engineering with Computers - Tập 15 - Trang 2-11 - 2014
B. Jeremić, K. Runesson, S. Sture
This paper describes the application of an Object-Oriented Paradigm (OOP) to the implementation of a hyperelastic constitutive driver. The C11 programming language used in our implementation leads to an efficient and readable program. It will be shown that object-oriented implementation naturally follows from analytical developments in isotropic hyperelasticity. Examples of classes developed and results from a number of large deformation hyperelastic numerical test are presented.
Tần số rung của nanoplate composite nhiều lớp phụ thuộc vào kích thước với các lớp bề mặt piezo-magnétique Dịch bởi AI
Engineering with Computers - Tập 38 - Trang 3007-3023 - 2021
Hu Liu, Qiao Zhang, Xianfeng Yang, Jingxuan Ma
Các vật liệu composite nhiều lớp được sử dụng rộng rãi trong nhiều kết cấu hàng không vũ trụ nhờ vào đặc tính cơ học tuyệt vời của chúng. Trong bài báo này, một mô hình phụ thuộc vào kích thước dựa trên lý thuyết gradient biến dạng không địa phương được áp dụng để tiết lộ hành vi rung của nanoplate composite nhiều lớp có các lớp bề mặt piezo-magnétique ở bề mặt trên và bề mặt dưới. Các phương trình quản lý được xác lập thông qua nguyên lý Hamilton và lý thuyết tấm Mindlin. Việc xác thực của nghiên cứu hiện tại được thực hiện thông qua việc so sánh với hai công trình trước đây và cho kết quả tốt. Bằng cách so sánh tần số rung của nanoplate composite nhiều lớp với và không có các lớp bề mặt piezo-magnétique, đã chứng minh rằng các lớp bề mặt piezo-magnétique ở trên và dưới sẽ làm tăng đáng kể tần số rung của nanoplate composite nhiều lớp. Hơn nữa, một cuộc điều tra số toàn diện được thực hiện để kiểm tra ảnh hưởng của kiểu lớp chéo, các tiềm năng điện và từ bên ngoài, tỷ lệ độ dày, các tham số quy mô kích thước, cũng như tỷ lệ chiều dài và tỷ lệ chiều rộng trên độ dày đến rung động của nanoplate composite nhiều lớp piezo-magnétique. Công trình hiện tại được kỳ vọng sẽ cung cấp một số hướng dẫn hữu ích cho việc sử dụng các bề mặt piezo-magnétique làm cảm biến và bộ truyền động để kiểm soát các hành vi rung của các cấu trúc nano composite nhiều lớp.
#composite nhiều lớp #nanoplate #rung động #lớp bề mặt piezo-magnétique #lý thuyết gradient biến dạng không địa phương
An enhanced pathfinder algorithm for engineering optimization problems
Engineering with Computers - Tập 38 Số 2 - Trang 1481-1503 - 2022
Tang, Chengmei, Zhou, Yongquan, Luo, Qifang, Tang, Zhonghua
The pathfinder algorithm (PFA) is a new population-based optimizer, it divides the search agents of the algorithm into leaders and followers, imitating the leadership level of the group movement to find the best food area or prey. In PFA, followers follow the new position according to the position of the leader and their own consciousness makes the algorithm easy to fall into local optimum. To overcome this shortcoming, the following stage is complicated in this paper, and the acceptance operator, the exchange operator and the mutation mechanism are introduced into the algorithm. To further balance the mining ability and exploration ability of the algorithm, the article regards the leader as a guide and introduces a guide mechanism. To verify the performance of the improved algorithm, it is applied to nine real-life engineering case problems. The simulation results of the real-life engineering design problems exhibit the superiority of the improved PFA (IMPFA) algorithm in solving challenging problems with constrained and unknown search spaces when compared to the basic PFA algorithm or other available solutions.
Hybrid intelligent method for fuzzy reliability analysis of corroded X100 steel pipelines
Engineering with Computers - Tập 37 - Trang 2559-2573 - 2020
Mansour Bagheri, Shun-Peng Zhu, Mohamed El Amine Ben Seghier, Behrooz Keshtegar, Nguyen-Thoi Trung
Epistemic uncertainties are critical for reliable design of corroded pipes made of high-strength grade steel. In this work, corrosion defects geometries and operating pressure are provided as the epistemic uncertainties in reliability analysis. A framework of an iterative approach-based bi-loop is presented for fuzzy reliability analysis (FRA) of corroded pipelines to evaluate the fuzzy reliability index-based various fuzzy-random variables (FRVs). In the inner loop, the conjugate first-order reliability method using adaptive finite-step size is applied for carried out the reliability analysis. The outer loop is structured based on the fuzzy analysis corresponding to a modified particle swarm optimization as an intelligent tool. The adaptive conjugate fine step size is dynamically computed to adjust the conjugate sensitivity vector in the reliability loop. The sufficient descent condition is satisfied based on three-term conjugate first-order reliability method. The performance function of corroded pipelines is defined based on average shear stress yield-based plastic flow theory, remaining strength factor, and operating pressure. Two applicable examples as corroded pipelines made from X100 high-strength steel are given to illustrate the effects of epistemic uncertainties under corrosion defects. Investigation the results has shown that modeling of epistemic uncertainty in the reliability analysis of high-grade steel pipelines could result more reasonable reliability indexes. In addition, results indicate that FRVs have significant influence on fuzzy reliability index calculations, especially corrosion defect depth and operating pressure (as FRVs). The sensitivity measure of FRA demonstrated that fuzzy reliability index of corroded X100 steel pipelines is more sensitive to the FRVs means.
Chebyshev polynomials for the numerical solution of fractal–fractional model of nonlinear Ginzburg–Landau equation
Engineering with Computers - Tập 37 - Trang 1377-1388 - 2019
M. H. Heydari, A. Atangana, Z. Avazzadeh
This paper introduces a new version for the nonlinear Ginzburg–Landau equation derived from fractal–fractional derivatives and proposes a computational scheme for their numerical solutions. The fractal–fractional derivative is defined in the Atangana–Riemann–Liouville sense with Mittage–Leffler kernel. The proposed approach is based on the shifted Chebyshev polynomials (S-CPs) and the collocation scheme. Through the way, a new operational matrix (OM) of fractal–fractional derivative is derived for the S-CPs and used in the presented method. More precisely, the unknown solution is separated into their real and imaginary parts, and then, these parts are expanded in terms of the S-CPs with undetermined coefficients. These expansions are substituted into the main equation and the generated operational matrix is utilized to extract a system of nonlinear algebraic equations. Thereafter, the yielded system is solved to obtain the approximate solution of the problem. The accuracy of the proposed approach is examined through some numerical examples. Numerical results confirm the suggested approach is very accurate to provide satisfactory results.
Frequency simulation of viscoelastic multi-phase reinforced fully symmetric systems
Engineering with Computers - Tập 38 - Trang 3725-3741 - 2020
M. S. H. Al-Furjan, Mostafa Habibi, Jing Ni, Dong won Jung, Abdelouahed Tounsi
Honeycomb structures have the geometry of the lattice network to allow the minimization of the amount of used material to reach minimal material cost and minimal weight. In this regard, this article deals with the frequency analysis of imperfect honeycomb core sandwich disk with multiscale hybrid nanocomposite (MHC) face sheets rested on an elastic foundation. The honeycomb core is made of aluminum due to its low weight and high stiffness. The rule of the mixture and modified Halpin–Tsai model are engaged to provide the effective material constant of the composite layers. By employing Hamilton’s principle, the governing equations of the structure are derived and solved with the aid of the generalized differential quadrature method (GDQM). Afterward, a parametric study is done to present the effects of the orientation of fibers ( $$\theta_{{\text{f}}} /\pi$$ ) in the epoxy matrix, Winkler–Pasternak constants ( $$K_{{\text{w}}}$$ and $$K_{{\text{p}}}$$ ), thickness to length ratio of the honeycomb network ( $$t_{{\text{h}}} /l_{{\text{h}}}$$ ), the weight fraction of CNTs, value fraction of carbon fibers, angle of honeycomb networks, and inner to outer radius ratio on the frequency of the sandwich disk. The results show that it is true that the roles of $$K_{{\text{w}}}$$ and $$K_{{\text{p}}}$$ are the same as an enhancement, but the impact of $$K_{{\text{w}}}$$ could be much more considerable than the effect of $$K_{{\text{p}}}$$ on the stability of the structure. Additionally, when the angle of the fibers is close to the horizon, the frequency of the system improves.
Validation of metamodels in simulation: a new metric
Engineering with Computers - - 2011
Husam Hamad
An intrinsic behavior-based model for interactive structural design
Engineering with Computers - Tập 2 - Trang 185-198 - 1987
John H. Grubbs, Michael H. Ackroyd, Kincho H. Law
This paper introduces a “generic” model for interactive design of constructed facilities. The proposed methodology synthesizes structural problem parameters and conditions in terms of load environment, structural properties, and function of the structure into a hierarchy of possible failure modes. Design evaluations are made in terms of this behavior hierarchy. The user has a high degree of control over the design process and may move at will to any of the design tasks. The model provides a direct link between the system user and the design evaluations during the evaluation/design process.
A new auto-tuning model for predicting the rock fragmentation: a cat swarm optimization algorithm
Engineering with Computers - Tập 38 - Trang 2209-2220 - 2020
Jiandong Huang, Panagiotis G. Asteris, Siavash Manafi Khajeh Pasha, Ahmed Salih Mohammed, Mahdi Hasanipanah
The main focus of the present work is to offer an auto-tuning model, called cat swarm optimization (CSO), to predict rock fragmentation. This population-based method has a stochastic formation involving exploration and exploitation phases. CSO is a robust and powerful meta-heuristic algorithm inspired by the behaviors of cats; it is composed of two search modes: seeking and tracing, which can be joined by mixture ratio parameter. CSO is applied to large-scale optimization problems like rock fragmentation to have good forecasting parameters in D80 formulas (D80 is a common descriptor that evaluates rock fragmentation). To evaluate the efficiency of the proposed CSO model, its obtained results were compared to those of the particle swarm optimization (PSO) algorithm. In the modeling, two forms of CSO and PSO models, including power and linear forms, were developed. The comparative results showed that CSO models outperformed the rival in terms of the task defined. The precision of the proposed models was computed using statistical evaluation criteria. Comparison results concluded that CSO-power model with the root mean square error (RMSE) of 0.847 was more computationally efficient with better predictive ability compared to CSO-linear, PSO-linear and PSO-power models with the RMSE of 1.314, 1.545 and 2.307, respectively. Furthermore, the sensitivity analysis revealed the effect of the stemming parameter upon D80 in comparison with other input parameters.
A methodology for quadrilateral finite element mesh coarsening
Engineering with Computers - Tập 24 - Trang 241-251 - 2008
Matthew L. Staten, Steven Benzley, Michael Scott
High fidelity finite element modeling of continuum mechanics problems often requires using all quadrilateral or all hexahedral meshes. The efficiency of such models is often dependent upon the ability to adapt a mesh to the physics of the phenomena. Adapting a mesh requires the ability to both refine and/or coarsen the mesh. The algorithms available to refine and coarsen triangular and tetrahedral meshes are very robust and efficient. However, the ability to locally and conformally refine or coarsen all quadrilateral and all hexahedral meshes presents many difficulties. Some research has been done on localized conformal refinement of quadrilateral and hexahedral meshes. However, little work has been done on localized conformal coarsening of quadrilateral and hexahedral meshes. A general method which provides both localized conformal coarsening and refinement for quadrilateral meshes is presented in this paper. This method is based on restructuring the mesh with simplex manipulations to the dual of the mesh. In addition, this method appears to be extensible to hexahedral meshes in three dimensions.
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