Fuzzy Finite Element Applications in the Waste Heat Boiler

2012 ◽  
Vol 215-216 ◽  
pp. 1180-1185
Author(s):  
Chao Li ◽  
Chang Hong Liu ◽  
Xin Chuan Qin ◽  
Yong Tai Li
Keyword(s):  
Finite Element ◽  
Waste Heat ◽  
Element Model ◽  
Engineering Problem ◽  
Waste Heat Boiler ◽  
Fuzzy Analysis ◽  
Fuzzy Variables ◽  
Fuzzy Finite Element ◽  
Α Level ◽  
Extreme Responses

A practical approach for analyzing the waste heat boiler with fuzzy parameters is developed. The methodology involves integrated finite element modeling and fuzzy analysis. The uncertainties in the material, loading and structural properties are represented using convex normal fuzzy sets. Vertex solution methodology that is based on α-cut representation is used for the fuzzy analysis. The values of the extreme responses at an α-level are obtained by applying the binary combinations of the fuzzy variables that result in extreme responses to the finite element model. The merit of the proposed methodology is computational efficiency without compromise on accuracy and this is demonstrated through the engineering problem.

scholarly journals A fast fuzzy finite element approach for laterally loaded pile in layered soils

2018 ◽  
Vol 12 (3) ◽  
pp. 1-9
Author(s):  
Pham Hoang Anh
Keyword(s):  
Finite Element ◽  
Soil Parameters ◽  
Fe Model ◽  
Finite Element Approach ◽  
Fuzzy Variables ◽  
Laterally Loaded Pile ◽  
Element Approach ◽  
Fuzzy Finite Element ◽  
Extreme Responses ◽  
Laterally Loaded

A fuzzy finite element approach for static analysis of laterally loaded pile in multi-layer soil with uncertain properties is presented. The finite element (FE) formulation is established using a beam-on-two-parameter foundation model. Based on the developed FE model, uncertainty propagation of the soil parameters to the pile response is evaluated by mean of the α-cut strategy combined with a response surface based optimization technique. First order Taylor's expansion representing the pile responses is used to find the binary combinations of the fuzzy variables that result in extreme responses at an α-level. The exact values of the extreme responses are then determined by direct FE analysis at the found binary combinations of the fuzzy variables. The proposed approach is shown to be accurate and computationally efficient. Article history: Received 05 October 2017, Revised 05 March 2018, Accepted 27 April 2018

scholarly journals Fuzzy finite element model updating of the DLR AIRMOD test structure

2017 ◽  
Vol 52 ◽  
pp. 512-526 ◽  
Author(s):  
H. Haddad Khodaparast ◽  
Y. Govers ◽  
I. Dayyani ◽  
S. Adhikari ◽  
M. Link ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Model Updating ◽  
Element Model ◽  
Test Structure ◽  
Finite Element Model Updating ◽  
Fuzzy Finite Element

scholarly journals Evaluate the Impact of Cold Wave on Face Slab Cracking Using Fuzzy Finite Element Method

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Dongjian Zheng ◽  
Lin Cheng ◽  
Yanxin Xu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Temperature Drop ◽  
Extension Principle ◽  
Cold Wave ◽  
Prevention Measures ◽  
Fuzzy Variables ◽  
Fuzzy Finite Element ◽  
The Impact ◽  
Element Method

We use fuzzy finite element method (FEM) to analyze the impact of cold wave on face slab cracking of a concrete-faced rockfill dam (CFRD). The static response of dam and the temperature field of face slab are calculated using deterministic FEM since some observed and test data can be obtained. Some parameters of Goodman contact element between face slabs and cushion material are selected as fuzzy variables, and the fuzzy FEM is used to calculate fuzzy stress of face slab. The fuzzy FEM is implemented using vertex method based on the extension principle. Through the analysis of two selected calculation cases of cold wave, it is shown that the calculated cracking direction and cracking zone caused by thermal stress are similar to those of the observed cracks. This proves that the cold wave that caused swift air temperature drop is an important reason for the cracking of face slab. According to these analysis results, some cracking prevention measures are then proposed.

Updating of Finite Element Model in Considering Mode Errors with Fuzzy Theory

2009 ◽  
Vol 413-414 ◽  
pp. 785-792 ◽  
Author(s):  
Yang Liu ◽  
Zhong Dong Duan ◽  
Hui Li
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Model Updating ◽  
Fuzzy Theory ◽  
Dynamic Properties ◽  
Fuzzy Model ◽  
Element Model ◽  
Structural Dynamic ◽  
Fuzzy Variables ◽  
Design Variables

Finite element model updating aims at reconciling the analytical model with the test one, to acquire a refined model with high-fidelity in structural dynamic properties. However, testing data are inevitable polluted by noises. In this study, the mode parameters and design variables are modeled as fuzzy variables, and a fuzzy model updating method is developed. Instead of a single optimal model, a set of satisfactory models is obtained. The most physically compatible solution is sorted by insights to the structures. The proposed method is applied to a real concrete bridge, for which a physically meaningful model is identified.

Modeling and Simulation Technology of Complex Mechanical Systems

2012 ◽  
Vol 215-216 ◽  
pp. 1186-1190 ◽  
Author(s):  
Bin Lin ◽  
Meng Lai Zhu ◽  
Xiao Gang Liu
Keyword(s):  
Finite Element ◽  
Modeling And Simulation ◽  
Mechanical System ◽  
Mechanical Systems ◽  
Element Model ◽  
Engineering Problem ◽  
Conveyor System ◽  
Finite Element Software ◽  
Complex Mechanical System ◽  
Complex Mechanical Systems

Reasonable simplification of finite element modeling of complex mechanical systems can reduce the amount of elements and nodes. The solution efficiency is improved in this way, which is of great economic significance in the practical engineering problem. Based on the modeling and simulation of a Conveyor System between Roving Frame and Spine Frame in automated textile production line, this paper investigates and proves the effectiveness of simplification of the complex mechanical system in the dominant finite element software – ANSYS. Results of static analysis of the simplified model agree well with the actual data, proving that the simplified solid-beam element model of the Conveyor System is reasonable. The results lay the foundation for the subsequent kinetic analysis and optimal design of complex mechanical system.

Simulation and Analysis for a Heat Recycle System on the Sidewall of Aluminum Reduction Cells

2014 ◽  
Vol 628 ◽  
pp. 327-331
Author(s):  
Yong Ming ◽  
Yong Guo ◽  
Nai Jun Zhou
Keyword(s):  
Finite Element ◽  
Heat Dissipation ◽  
Waste Heat ◽  
Element Model ◽  
Aluminum Reduction Cell ◽  
Element Analysis ◽  
Thermo Electric ◽  
Aluminum Reduction ◽  
Reduction Cell ◽  
Power Generation Technology

Aim at developing power generation technology using the waste heat of the cell sidewall, a heat recycle installation was designed and used for recycling heat of the sidewall of a 400kA aluminum reduction cell. A 3D slice finite element model of aluminum reduction cell was established by using ANSYS finite element analysis software, and the coupled thermo-electric simulation for a 400kA cell was analyzed under installing the exchanger or not. The simulation results show the average temperature of main heat dissipation area of the cell is significantly decreased after installing the exchanger, and the thickness of freeze would also increase 1.7cm, which benefits in decreasing the heat dissipation and protecting the lining of the cell.

scholarly journals A fuzzy finite element algorithm based on response surface method for free vibration analysis of structure

2015 ◽  
Vol 37 (1) ◽  
pp. 17-27 ◽  
Author(s):  
Nguyen Hung Tuan ◽  
Le Xuan Huynh ◽  
Pham Hoang Anh
Keyword(s):  
Finite Element ◽  
Free Vibration ◽  
Response Surface ◽  
Surrogate Model ◽  
Mode Shapes ◽  
Superposition Method ◽  
Fuzzy Variables ◽  
Fuzzy Finite Element ◽  
Element Algorithm

This paper introduces an improved response surface-based fuzzy finite element analysis of structural dynamics. The free vibration of structure is established using superposition method, so that fuzzy displacement responses can be presented as functions of fuzzy mode shapes and fuzzy natural frequencies. Instead of direct determination of these fuzzy quantities by modal analysis which will involve the calculation of the whole finite element model, the paper proposes a felicitous approach to design the response surface as surrogate model for the problem. In the design of the surrogate model, complete quadratic polynomials are selected with all fuzzy variables are transformed to standardized fuzzy variables. This methodology allows accurate determination of the fuzzy dynamic outputs, which is the major issue in response surface based techniques. The effectiveness of the proposed fuzzy finite element algorithm is illustrated through a numerical analysis of a linear two-storey shear frame structure.

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