Multiobjective Optimal Double-Layer PM Rotor Structure Design of IPMSM by Response Surface Method and Finite Element Method

2010 ◽  
Vol 24 (6) ◽  
pp. 123-130 ◽  
Author(s):  
Gil-Sun Choi ◽  
Sung-Chin Hahn
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Response Surface ◽  
Response Surface Method ◽  
Double Layer ◽  
Structure Design ◽  
Surface Method ◽  
Rotor Structure ◽  
Element Method

Tunnel Reliability Analysis Based on the Combination of Modified FOSM and Numerical Calculation Program

2014 ◽  
Vol 577 ◽  
pp. 1174-1181 ◽  
Author(s):  
Li Hong Chen ◽  
Xiao Bing Chai ◽  
Hai Zhu Fan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Reliability Analysis ◽  
Response Surface ◽  
Response Surface Method ◽  
Complex Structure ◽  
Surface Method ◽  
First Order Second Moment ◽  
Second Moment Method ◽  
Element Method

Evaluate the reliability for the deformation of structure is a hard work. Usually stochastic finite element method or response surface method was adopted. In this paper, a new way by combining of numerical method and modified reliability analysis method is proposed. The modified first order second moment method (FOSM) was introduced and three examples are employed to verify the feasibility and the effectiveness of this method. The examples showed the modified FOSM had the advantage of faster convergence rate, higher calculation accuracy in comparison with FOSM, response surface method and optimization algorithm method. Combining finite element method program with modified FOSM method is applied to analyze the reliability index of deformation of a tunnel. The results showed this approach was a successful method to analyze the reliability of complex structure.

A Study about Wind Stresses of 4-Dish Parabolic Solar Collector System by Using FEM and Response Surface Method

2014 ◽  
Vol 915-916 ◽  
pp. 209-213
Author(s):  
Byeong Uk Song ◽  
Tae Il Seo ◽  
Youn Seung Jeong
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Central Composite Design ◽  
Response Surface ◽  
Response Surface Method ◽  
Solar Collector ◽  
Collector System ◽  
Surface Method ◽  
Central Composite ◽  
Maximum Stresses

This paper presented a study about maximum stresses acting on the 4-dish solar collector system, which caused by excessive wind. For this, Central Composite Design and Response Surface Method were used on the basis of maximum stresses calculated by Finite Element Method. VisualDOC was used for CCD (Central Composite Design) and RSM (Response Surface Method), and Ansys was used for FEM (Finite Element Method) analysis. 9 cases of CCD points were selected and FEM analyses were conducted at these points. Based on these results, response surface function was constructed to model maximum stresses as function of wind velocity and thickness of dish support bar. In order to evaluate RSM model, arbitrary point were selected, and maximum stresses calculated by RSM were compared with those calculated by FEM.

Robust Stress Check Formula of Lifting Padeye

2010 ◽  
Vol 54 (01) ◽  
pp. 34-40
Author(s):  
Zhou Bo ◽  
Liu Yujun ◽  
Ji Zhuoshang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Accurate Method ◽  
Offshore Structures ◽  
Structure Design ◽  
Stress Calculation ◽  
Check Method ◽  
External Loads ◽  
Actual Stress ◽  
Element Method

Lifting padeyes are widely used in the construction of offshore structures and ships. It has been shown that the traditional check method cannot reflect the realistic value and distribution of actual stress on the padeyes. A more accurate method for the padeye stress calculation is essential and important for promoting the safety of the padeyes. In this paper, a new check formula is proposed based on the analysis of deformation and external loads distribution on lifting padeyes. The results of finite element method and the solutions of traditional check formula and new check formula are compared. It is shown that, by applying the stress check formula derived in the paper, the value and the location of the dangerous stresses occurred can be evaluated easily and exactly. The safe reliability of structure design can be improved significantly.

scholarly journals New CZM for Interfacial Crack Growth

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Huifen Peng ◽  
Yujie Song ◽  
Ye Xia
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Crack Growth ◽  
Interface Crack ◽  
Interfacial Crack ◽  
Structure Design ◽  
Zone Model ◽  
Simulation Results ◽  
The Impact ◽  
Element Method

The cohesive zone model (CZM) has been widely used for numerical simulations of interface crack growth. However, geometrical and material discontinuities decrease the accuracy and efficiency of the CZM when based on the conventional finite element method (CFEM). In order to promote the development of numerical simulation of interfacial crack growth, a new CZM, based on the wavelet finite element method (WFEM), is presented. Some fundamental issues regarding CZM of interface crack growth of double cantilever beam (DCB) testing were studied. The simulation results were compared with the experimental and simulation results of CFEM. It was found that the new CZM had higher accuracy and efficiency in the simulation of interface crack growth. At last, the impact of crack initiation length and elastic constants of material on interface crack growth was studied based on the new CZM. These results provided a basis for reasonable structure design of composite material in engineering.

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