scholarly journals Structural Response of a Reciprocating Compressor's Discharge Tube Subjected to Model and Data Uncertainties

2018 ◽  
Vol 23 (No 3, September 2018) ◽  
pp. 385-391
Author(s):  
Filipe Fontanela ◽  
Olavo Mecias da Silva ◽  
Thiago Antonio Fiorentin ◽  
Arcanjo Lenzi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stochastic Models ◽  
Structural Response ◽  
Model Parameters ◽  
Manufacturing Processes ◽  
The Finite Element Method ◽  
Physical Processes ◽  
Parameter Uncertainties ◽  
Deterministic Framework

The analysis of the dynamical responses of compressor components are typically evaluated by using mathematicalmechanical models, and many decisions are given based on numerical simulations. Such an investigation is usually performed in a deterministic framework that cannot consider the uncertainties of the numerical model. These uncertainties are present in a numerical investigation due to the variability of the model parameters, caused by the limitations of the manufacturing processes, as well as simplifications and/or lack of knowledge to describe complex physical processes accurately. In order to quantify the sensitivity of the model parameters and the epistemic uncertainties of a discharge tube’s structural numerical response—solved by the finite element method—two stochastic models are constructed, and their results are simultaneously analysed. The dynamical responses obtained from both stochastic models identify the robustness limits of the structural response when it is subjected to parameter uncertainties as well as model sensitivity by separating each contribution in the estimated dynamical structural response.

scholarly journals Design and Structural Analysis of a SWATH type vessel using the Finite Element Method and its response to Slamming events

2020 ◽  
Vol 14 (27) ◽  
pp. 55-66
Author(s):  
Hugo Leonardo Murcia Gallo ◽  
Richard Lionel Luco Salman ◽  
David Ignacio Fuentes Montaña
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
High Speed ◽  
Load Condition ◽  
Structural Response ◽  
Water Area ◽  
The Finite Element Method ◽  
Short Period ◽  
Classification Society ◽  
Element Method

The main objective of this study is to analyze the structural response of a boat during a slamming event using the Finite Element Method in a Small Water Area Twin Hull (SWATH) type boat.  In the mentioned load condition, the acceptance criteria established by a classification society must be fulfilled, taking into account the areas where this event affects the structure such as the junction deck, the pontoons and other structural members established by the standard, all this generated by the high pressure loads in the ship's structure in a very short period of time being an element of study in this type of vessels, as long as they are within the range of high speed vessels. Among the main results of this study were the deformations and stresses in the structure obtained under the reference parameters of the classification society.

scholarly journals Eigenfunction Convergence of the Rayleigh-Ritz-Meirovitch Method and the FEM

2007 ◽  
Vol 14 (6) ◽  
pp. 417-428 ◽  
Author(s):  
C.A. Morales ◽  
R. Goncalves
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Linear Combination ◽  
Ritz Method ◽  
Structural Response ◽  
Characteristic Functions ◽  
Natural Mode ◽  
The Finite Element Method ◽  
Definition Of ◽  
General Response

Eigenfunction convergence characteristics of the finite element method and the Rayleigh-Ritz method with quasicomparison functions (RRMM) are compared. The RRMM has previously proved to be superior in comparing eigenvalue convergence characteristics. The importance of studying natural mode convergence is associated to the fact that the general response of a structure is a linear combination of these characteristic functions; in other words, accurate structural response attainment demands accurate structural modes in the analysis. It is shown that in this case the RRMM also produces superior results. A refined definition of quasicomparison functions is advanced.

A 3D Numerical Study to Investigate the Effects of Temperature Variation and Residual Stresses in Representative Volume MEMS Elements

2010 ◽  
Author(s):  
A. R. Maligno ◽  
D. C. Whalley ◽  
V. V. Silberschmidt
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Residual Stresses ◽  
Numerical Study ◽  
Manufacturing Processes ◽  
The Finite Element Method ◽  
Physics Of Failure ◽  
Temperature Variations ◽  
Failure Initiation ◽  
Effects Of Temperature

The reliability of MEMS, and in particular of RF MEMES switches, might be increased by the use of a Physics of Failure (PoF) methodology. A numerical study, based on the finite element method (FEM), has been carried out to investigate the effects of temperature variations on failure (e.g. yielding of metals) onset within multilayered MEMS structures. Furthermore, the manufacturing processes of MEMS are the main sources of residual stresses development and they represent one of the most profound factors reducing the functionality and reliability of MEMS packages. Therefore, the effect of residual stresses on failure onset has been considered in these studies to examine their effects on MEMS reliability. Numerical results have shown that failure initiation is strongly influenced by the loading conditions (i.e. different range of temperatures), boundary conditions and finally by the presence of residual stresses.

Finite Element Assessment of Difficult Pipelines at Bends

2014 ◽  
Vol 567 ◽  
pp. 253-258
Author(s):  
Zahiraniza Mustaffa ◽  
Thar M. Badri Albarody ◽  
Azrulfirdaus Muhamad Roshdi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Distribution ◽  
Equivalent Stress ◽  
Structural Response ◽  
The Finite Element Method ◽  
Pipe Bend ◽  
Dead End ◽  
Numerical Assessment ◽  
Different Depths

This paper presents numerical assessment of difficult pipelines at bends using the finite element method (FEM). Difficult pipelines are those that are unable to be inspected using a pig inspection tool. These unpiggable pipes, especially at the bend sections, exhibit difficulties to be piggable for several reasons, thus they are exposed to hazards that can neither be inspected nor controlled. The structural response of the bends is then required to be investigated. This paper aims at simulating the structural response of bends caused by internal corrosions using the ANSYS FEM software. Circular pitting corrosion at different depths and diameters were applied to simulate the stress distribution for three pipe models, namely standard 90° pipe bend, miter bend and unbarred full-bore tees pipe bend near dead end. The results of different corrosion equivalent stress distribution were compared and the most reliable type of bend was reported.

scholarly journals A Short Review on the Finite Element Method for Asymmetric Rolling Processes

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 762
Author(s):  
Ana Graça ◽  
Gabriela Vincze
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mechanical Behavior ◽  
Texture Evolution ◽  
Model Parameters ◽  
The Finite Element Method ◽  
Asymmetric Rolling ◽  
Element Analysis ◽  
Curvature Effects ◽  
Element Method

Several studies on asymmetric rolling processes use the Finite Element Method (FEM) to predict material deformation and optimize process parameters, such as rolls’ forces and torques. Early studies focused on the observation and measure of curvature effects due to the asymmetric conditions. However, these models could not predict mechanical behavior associated with the texture evolution during the rolling processes. More recent studies introduced crystal plasticity (CP) models into the FEM to analyze and quantify the texture evolution during plastic forming. However, these coupled techniques need more investigation, especially concerning the mechanical behavior of the material during and after multi-stage ASR procedures. The purpose of this work is to present an up-to-date literature review on the implementation of asymmetric rolling processes in finite element analysis. It shows a summarized overview of the asymmetric rolling model parameters from different authors and gives a brief description of the crystallographic models used in their studies. In the end, some suggestions for future work dedicated to the analysis of ASR through FEM are given.

Simulation of tuning graphene plasmonic behaviors by ferroelectric domains for self-driven infrared photodetector applications

Nanoscale ◽  
2019 ◽  
Vol 11 (43) ◽  
pp. 20868-20875 ◽  
Author(s):  
Junxiong Guo ◽  
Yu Liu ◽  
Yuan Lin ◽  
Yu Tian ◽  
Jinxing Zhang ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Interfacial Effect ◽  
Infrared Photodetector ◽  
The Finite Element Method ◽  
Ferroelectric Domains ◽  
Element Method

We propose a graphene plasmonic infrared photodetector tuned by ferroelectric domains and investigate the interfacial effect using the finite element method.

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