scholarly journals Fatigue Durability Analysis of Collecting Rapping System in Electrostatic Precipitators under Impact Loading

2014 ◽  
Vol 2014 ◽  
pp. 1-9
Author(s):  
Ali Akbar Lotfi Neyestanak ◽  
Saeed Adib Nazari ◽  
Ali Imam ◽  
Cyrus Aghanajafi
Keyword(s):  
Fatigue Failure ◽  
Microscopic Examination ◽  
Impact Loading ◽  
Material Selection ◽  
System Optimization ◽  
Fatigue Durability ◽  
Durability Analysis ◽  
New Material ◽  
Electrostatic Precipitators ◽  
Beach Marks

Due to the importance of collecting rapping system in electrostatic precipitators (ESP) and controlling the relevant damage under impact loading, fatigue durability of this system is analyzed in the present study based on the numerical and experimental results considering fatigue damage growth and vibration acceleration in the collecting system because of the successive impact of rapping hammers. By microscopic examination of the fracture surface of rapping hammer, beach marks obviously show typical fatigue failure in the rapping hammer arm. In addition, the microscopic examination of the cross section of the collecting plates indicates the corrosion voids which cause crack and eventually fatigue failure. The finite element method is applied to determine both the stress and concentration positions of dynamic stress on the rapping system under impact loading. The paper results can be utilized in system optimization and new material selection for the system by evaluating rapping system durability.

Projection Method for Material Selection Problem with Triangular Fuzzy Numbers

2014 ◽  
Vol 1046 ◽  
pp. 375-379
Author(s):  
Lian Wu Yang ◽  
Shi Xiao Xiao ◽  
Shao Liang Yuan
Keyword(s):  
Projection Method ◽  
Fuzzy Numbers ◽  
Material Selection ◽  
Influence Factors ◽  
Selection Problem ◽  
Variation Method ◽  
Grinding Wheel ◽  
Triangular Fuzzy Numbers ◽  
New Material ◽  
Multi Attribute Decision Making

The aim of this paper is to develop a new method for the material selection problem, which is important for the product design. Material selection problem is actually a multi-attribute decision making (MADM) problem which contains many influence factors. The new material selection method is an extension of projection method with evaluation attribution values expressed with triangular fuzzy numbers. Coefficient of variation method is used to determine weights of evaluation attribute. A grinding wheel abrasive material selection problem is used to illustrate the effectiveness and practicability of the proposed method.

Development of fatigue durability analysis techniques of cables and application for products

2016 ◽  
Vol 2016.29 (0) ◽  
pp. 081
Author(s):  
Jun MORIMOTO ◽  
Harumi KINOSHITA ◽  
Wataru NITTA ◽  
Shinya TANIKAWA ◽  
Koji HISANO ◽  
...  
Keyword(s):  
Analysis Techniques ◽  
Fatigue Durability ◽  
Durability Analysis

Improved COPRAS Method and Application in Material Selection Problem

2014 ◽  
Vol 707 ◽  
pp. 505-508
Author(s):  
Fei Xia ◽  
Huan Wei ◽  
Lian Wu Yang
Keyword(s):  
Coefficient Of Variation ◽  
Material Selection ◽  
Selection Method ◽  
Decision Makers ◽  
Selection Problem ◽  
New Method ◽  
Variation Method ◽  
New Material ◽  
Copras Method

The aim of this paper is to put forward a new material selection method based on COPRAS method. The method combines the COPRAS method and coefficient of variation method. The new method is simple and easy to use, and coefficient of variation method can objectively determine the attributes weights. Thus it can be easily accepted by decision makers. Finally, a practical example is used to demonstrate the feasibility and effectiveness of the proposed method.

Process Integration of Fatigue Analysis for Welded Bogie Frames

2006 ◽  
Vol 321-323 ◽  
pp. 624-627 ◽  
Author(s):  
Seung Ho Han ◽  
Je Sung Bang ◽  
Chae Whan Rim ◽  
Kwang Soon Lee ◽  
Kwang Ki Lee ◽  
...  
Keyword(s):  
Process Integration ◽  
Fatigue Analysis ◽  
Fatigue Durability ◽  
Durability Analysis ◽  
Iterative Analysis

The automation of fatigue durability analysis for welded bogie frames according to the UIC-code is proposed by using the ModelCenter, which enables several tools used in fatigue durability analysis to be integrated, i.e. I-DEAS, ANSYS and BFAP, and an iterative analysis of geometrical changes in transom support bracket to be performed. In additions wrapping programs to control I/O-data and interfaces of these tools were developed. The developed automation technique brings not only a significant decrease in man-hour required for durability analysis, but also provides a platform for multidisciplinary engineering activities.

A Material Selection Method Based on Double Base Points

2014 ◽  
Vol 707 ◽  
pp. 509-513
Author(s):  
Shi Gang Chao
Keyword(s):  
Material Selection ◽  
Selection Method ◽  
Distance Measures ◽  
Entropy Weight ◽  
Base Points ◽  
Decision Making Problem ◽  
New Material ◽  
Double Base ◽  
Multiple Attributes Decision Making ◽  
Selection Of

The selection of the most desirable material contains many evaluation attributes, and thus leads to hard be solved. The material selection is actually a multiple attributes decision making problem, which has been studied by many authors. The aim of this study is to propose a new material selection method, which is an improved double base points method through defining the entropy weight and used the relative approach degree to measure the distance measures. The method may avoid the influence of subjective factors through the entropy weight, is very suitable for material selection problem. The applied example proves that the method is both effective and exercisable.

scholarly journals Summary of fatigue durability analysis of whole vehicle

2021 ◽  
Vol 1820 (1) ◽  
pp. 012073
Author(s):  
Nai-Rui Shen ◽  
Fei Liu ◽  
Jing-Jing Qu ◽  
Hai Lan ◽  
Hong-Yi Liao ◽  
...  
Keyword(s):  
Fatigue Durability ◽  
Durability Analysis

INCREASING FATIGUE DURABILITY OF A BOLT JOINT/SRIEGINĖS JUNGTIES CIKLINIO ILGAAMŽIŠKUMO DIDINIMAS TAIKANT DETALIŲ TARPUSAVIO PASUKIMIŲ BŪDĄ

2000 ◽  
Vol 6 (4) ◽  
pp. 262-267
Author(s):  
Algimantas Krenevičius ◽  
Kęstutis Vislavičius
Keyword(s):  
Mathematical Model ◽  
Computer Program ◽  
Fatigue Failure ◽  
Personal Computer ◽  
Fatigue Curve ◽  
Fatigue Durability ◽  
Miner’S Rule ◽  
The Mathematical Model ◽  
Personal Computer Program ◽  
Survival Condition

A method of increasing the fatigue durability of a bolt joint is considered. It is based on the position of the nut with respect to the bolt. Turning the nut causes its threads to be in contact with different threads of the bolt during sequential periods of use. The thread of the bolt which experiences the highest loading is in contact with the first (most dangerous) thread of the nut. With further nut turns, the bolt thread experiences less loading because of the contact with another (less dangerous) threads of the nut. Reducing the loading in this way can increase the fatigue durability. The nut position with respect to the bolt can be controlled using different heights of washer-bushing. The durability calculation is based on the fatigue curve for the bolt joint when it is tested without turning the nut. The sum of damage is calculated for all points of the bolt thread which are in contact with the first turn of the nut for any loading period. According to the Miner's rule, fatigue failure occurs when the sum of damage is equal to one. The mathematical model for calculating the maximum fatigue durability of bolt joint is given. It is assumed that the height of washer-bushing, the number of turns of the nut and the fatigue curve for the threaded bolt joint are known. The survival condition is that for any point on the bolt, the sum of damage after the last loading period must be less than one. A personal computer program for the fatigue durability calculation is prepared, and some example problems are solved. An analysis of the results is presented.

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