CMES-Vol. 116, No. 3, 2018

Open Access

ARTICLE

Improved State-Based Peridynamic Lattice Model Including Elasticity, Plasticity and Damage
Siavash Nikravesh^{1, *}, Walter Gerstle¹
CMES-Computer Modeling in Engineering & Sciences, Vol.116, No.3, pp. 323-347, 2018, DOI:10.31614/cmes.2018.04099
Abstract In this study, a recently developed peridynamic lattice model called the “State-based Peridynamic Lattice Model” (SPLM) is improved and demonstrated. In the SPLM, rather than as a continuum, solids are simulated using a close-packed lattice of peridynamically interacting particles. The new SPLM approach advances the SPLM model by improving the damage and plasticity models. Elasticity, plasticity and damage are coupled in this approach. A robust method for damage initiation is developed. A new damage model called the “two-spring damage model” allows damage to localize to a single lattice particle, thus allowing highly localized damage… More >

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ARTICLE

Eddy Current Analyses by Domain Decomposition Method Using Double-Double Precision
Mizuma Takehito^1,*, Takei Amane¹
CMES-Computer Modeling in Engineering & Sciences, Vol.116, No.3, pp. 349-363, 2018, DOI:10.31614/cmes.2018.01714
Abstract A matrix equation solved in an eddy current analysis, A-ϕ method based on a domain decomposition method becomes a complex symmetric system. In general, iterative method is used as the solver. Convergence of iterative method in an interface problem is improved by increasing an accuracy of a solution of an iterative method of a subdomain problem. However, it is difficult to improve the convergence by using a small convergence criterion in the subdomain problem. Therefore, authors propose a method to introduce double-double precision into the interface problem and the subdomain problem. This proposed method improves More >

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ARTICLE

Machining Parameters Optimization of Multi-Pass Face Milling Using a Chaotic Imperialist Competitive Algorithm with an Efficient Constraint-Handling Mechanism
Yang Yang^{1, *}
CMES-Computer Modeling in Engineering & Sciences, Vol.116, No.3, pp. 365-389, 2018, DOI:10.31614/cmes.2018.03847
Abstract The selection of machining parameters directly affects the production time, quality, cost, and other process performance measures for multi-pass milling. Optimization of machining parameters is of great significance. However, it is a nonlinear constrained optimization problem, which is very difficult to obtain satisfactory solutions by traditional optimization methods. A new optimization technique combined chaotic operator and imperialist competitive algorithm (ICA) is proposed to solve this problem. The ICA simulates the competition between the empires. It is a population-based meta-heuristic algorithm for unconstrained optimization problems. Imperialist development operator based on chaotic sequence is introduced to improve… More >

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UPFC Based Real-Time Optimization of Power Systems for Dynamic Voltage Regulation
Serhat Berat Efe^{1,*^{CMES-Computer Modeling in Engineering & Sciences, Vol.116, No.3, pp. 391-406, 2018, DOI:10.31614/cmes.2018.01784

Abstract
Flexible alternating current transmission system (FACTS) components are used to utilize the electrical transmission lines at their optimum capacity. The best way to achieve this optimization is to manage the active and reactive power flows. A unified power flow controller (UPFC) is one of the most significant devices developed for the effective control of power flows. Although conventional UPFC structures can be used to achieve this process, the expansion of power systems has led to the necessity of developing various UPFC devices. This paper focuses on an advanced real time control approach of UPFC… More >}}

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Spline Fictitious Boundary Element Alternating Method for Edge Crack Problems with Mixed Boundary Conditions
Z. Xu¹, M. Chen¹, X. M. Fan^1,2,*
CMES-Computer Modeling in Engineering & Sciences, Vol.116, No.3, pp. 407-431, 2018, DOI:10.31614/cmes.2018.01816
Abstract The alternating method based on the fundamental solutions of the infinite domain containing a crack, namely Muskhelishvili’s solutions, divides the complex structure with a crack into a simple model without crack which can be solved by traditional numerical methods and an infinite domain with a crack which can be solved by Muskhelishvili’s solutions. However, this alternating method cannot be directly applied to the edge crack problems since partial crack surface of Muskhelishvili’s solutions is located outside the computational domain. In this paper, an improved alternating method, the spline fictitious boundary element alternating method (SFBEAM), based More >

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A Computer-Aided Tuning Method for Microwave Filters by Combing T-S Fuzzy Neural Networks and Improved Space Mapping
Shengbiao Wu^1,2,3, Weihua Cao^1,3,*, Can Liu^1,3, Min Wu^1,3
CMES-Computer Modeling in Engineering & Sciences, Vol.116, No.3, pp. 433-453, 2018, DOI:10.31614/cmes.2018.03309
Abstract A computer-aided tuning method that combines T-S fuzzy neural network (T-S FNN) and offers improved space mapping (SM) is presented in this study. This method consists of three main aspects. First, the coupling matrix is effectively extracted under the influence of phase shift and cavity loss after the initial tuning. Second, the surrogate model is realized by using a T-S FNN based on subspace clustering. Third, the mapping relationship between the actual and the surrogate models is established by the improved space mapping algorithm, and the optimal position of the tuning screws are found by More >

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Effect of Plaque Composition on Biomechanical Performance of a Carotid Stent: Computational Study
Xinyang Cui¹, Qingshuai Ren^1,2, Zihao Li¹, Kun Peng¹, Gaoyang Li^1,3, Zhaoyong Gu¹, Aike Qiao^1,*
CMES-Computer Modeling in Engineering & Sciences, Vol.116, No.3, pp. 455-469, 2018, DOI:10.31614/cmes.2018.04135
Abstract Clinical application of bare metal stents is constrained by the occurrence of in-stent restenosis, mainly due to the complex biomechanical environment in the body. Numerical simulation method was used to evaluate the effect of plaque composition on stent performance in a carotid artery. CT angiography (CTA) data were used as a reference, and zero-load state of the carotid artery was used to establish a 3D stenotic artery model. Different plaque compositions, calcified and hypo-cellular were defined in Model 1 and Model 2, respectively. Interactions between the stents and arterial tissues within the stent crimping-expansion process… More >

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