scholarly journals Determination of the oscillation frequencies of corrosion defects finite element methods in order to develop methods of acoustic monitoring of pipelines

2015 ◽  
Vol 86 ◽  
pp. 012035 ◽  
Author(s):  
Yu V Vankov ◽  
Sh G Ziganshin ◽  
E V Izmailova ◽  
V V Serov
Keyword(s):  
Finite Element ◽  
Finite Element Methods ◽  
Acoustic Monitoring ◽  
Corrosion Defects ◽  
Oscillation Frequencies

The Calculation of Force Effects of a Conveyor Belt of the Pipe Conveyor to Forming Rollers by FEM

2015 ◽  
Vol 806 ◽  
pp. 181-186
Author(s):  
Gabriel Fedorko ◽  
Vieroslav Molnár ◽  
Peter Michalik ◽  
Nikoleta Husáková ◽  
Ivica Ristović ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Methods ◽  
Conveyor Belt ◽  
Calculation Model ◽  
Present Information ◽  
Conveyor Belts ◽  
Original Calculation

The paper interprets the calculation of the size of force effects created by the reason of the effect of balled conveyor belt of pipe conveyor to the guide rollers located in the ring idler stations. Knowing them is essential for the research of dynamic resistances by pipe conveyors operations. Examined force effects were determined by the help of finite element methods. The calculation was performed by the program Abaqus. Presented calculation is realized by original calculation model. The results of the calculation present information about action of the effect force of the balled conveyor belt to the guide rolls in the ring idler station. Results became a basis for determination of postulates for identification of dynamic resistances. Their knowledge is the key element for conveyor belts lifetime increase.

scholarly journals Анализ методов расчёта крутильных колебаний судовых валопроводов

2020 ◽  
Vol 44 (3) ◽  
pp. 71-79
Author(s):  
Keyword(s):  
Finite Element ◽  
Accurate Method ◽  
Natural Oscillation ◽  
Calculation Methods ◽  
Oscillating Systems ◽  
Experimental Values ◽  
Similar Accuracy ◽  
Oscillation Frequencies ◽  
Elastic Characteristics

Рассмотрены невыясненные вопросы крутильных колебаний судовых валопроводов с целью повышения точности расчета собственных частот крутильных колебаний путем определения наиболее точного метода приведения системы к дискретному виду. Исследуются две крутильноколеблющиеся системы: экспериментальная установка простой конструкции (двухопорный вал с массами, имеющий привод от электродвигателя) и более сложная – главный пропульсивный комплекс портового буксира РБТ проекта 378. Для этого решается ряд задач: расчет установок двумя методами (с помощью классических уравнений определения инерционных и упругих характеристик системы и программ, использующих методы конечных элементов); торсиографирование названных систем для определения значений экспериментальных значений частот собственных колебаний; сравнительный анализ полученных расчетным и экспериментальным путем значений частот собственных колебаний: на его основе определяются наиболее точные методы расчета. Установлено, что оба рассматриваемых расчетных метода дают результаты приблизительно одной точности. Отмечено, что исследованные модели относительно просты с точки зрения их анализа и определения характеристик. Картина может измениться в случае более сложных систем: тогда один из рассмотренных методов может показать явное преимущество. Ключевые слова: крутильные колебания, метод конечных элементов, судовая энергетическая установка. The outstanding issues of torsion vibrations of vessels' shaft lines in order to improve the accuracy of calculating the natural frequencies of torsion vibrations by determining the most accurate method of reducing the system to the discrete form. Two torsion-oscillating systems are studied: an experimental installation of a simple design (a two – support shaft with weights, driven by an electric motor) and a more complex one – the main propulsive unit of RBT project 378 port tug. With this purpose a number of problems have to be solved: calculation of installations with two methods (using classical equations for determining the inertial and elastic characteristics of the system and programs using finite element methods); torsiography of these systems to determine the values of experimental values of natural oscillation frequencies; comparative analysis of calculated and experimental values of natural oscillation frequencies and determination of the most accurate calculation methods on its basis. It has been found that both calculation methods being considered lead to results of approximately similar accuracy. It is noted that the studied models are relatively simple in terms of their analysis and characterization. The picture may change in the case of more complex systems: then one of the methods considered may show a clear advantage. Keywords: torsion vibrations, finite element method, ship power plant.

scholarly journals Determination of the Neck Size between Powders during Sintering Process Using Finite Element Methods

2020 ◽  
Vol 1 (2) ◽  
pp. 29-36
Author(s):  
Anas Obeed Balod ◽  
Ziad Al Sarraf ◽  
Anas Abid Mattie
Keyword(s):  
Finite Element ◽  
Finite Element Methods ◽  
Process Time ◽  
Sintering Process ◽  
Solid Product ◽  
Discrete Method ◽  
Neck Size ◽  
Powder Density ◽  
Structure Geometry

Today, sintering considers one of the significant processes that can be used in powder technology to produce a new solid product from powders using thermal energy. Many parameters can be successfully controlled by this process such as temperature, Particle size, process time, structure geometry, powder density, and powder composition. Study and analysis of the behavior of powder during the sintering process was carried out using finite element methods. The simulation provides two styles of discrete method and Qusi-static method. This research contributes to two types of processes in order to simulate the copper powder during the sintering process and to determine the variation by using contact and shrinkage ratios of powder behaviors. Finally, a comparison between the two styles of discrete element method explains how the selected parameters were impacted on the sintering process.

Equilibrium Profile of Modern Belted Radial Ply Tires: Its Determination and Performance Benefits

2013 ◽  
Vol 41 (2) ◽  
pp. 127-151
Author(s):  
Rudolf F. Bauer
Keyword(s):  
Finite Element ◽  
Aspect Ratio ◽  
Finite Element Methods ◽  
Mathematical Analysis ◽  
Internal Stresses ◽  
Stress Concentrations ◽  
Equilibrium Profiles ◽  
Equilibrium Profile ◽  
And Performance ◽  
Beneficial Property

ABSTRACT The benefits of a tire's equilibrium profile have been suggested by several authors in the published literature, and mathematical procedures were developed that represented well the behavior of bias ply tires. However, for modern belted radial ply tires, and particularly those with a lower aspect ratio, the tire constructions are much more complicated and pose new problems for a mathematical analysis. Solutions to these problems are presented in this paper, and for a modern radial touring tire the equilibrium profile was calculated together with the mold profile to produce such tires. Some construction modifications were then applied to these tires to render their profiles “nonequilibrium.” Finite element methods were used to analyze for stress concentrations and deformations within all tires that did or did not conform to equilibrium profiles. Finally, tires were built and tested to verify the predictions of these analyses. From the analysis of internal stresses and deformations on inflation and loading and from the actual tire tests, the superior durability of tires with an equilibrium profile was established, and hence it is concluded that an equilibrium profile is a beneficial property of modern belted radial ply tires.

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