scholarly journals Elastomeric door seal analysis under aircraft cabin pressure

2021 ◽  
Author(s):  
B. Franke Goularte ◽  
V. Zatko ◽  
A. Lion ◽  
M. Johlitz
Keyword(s):  
Finite Element Method ◽  
Initial Step ◽  
Qualitative Approach ◽  
Linear Boundary ◽  
Air Leakage ◽  
The Finite Element Method ◽  
Aircraft Cabin ◽  
Pressure Distributions ◽  
Contact Response ◽  
Elastomeric Seals

AbstractSimple strategies are used to physically represent the cabin pressure acting on elastomeric seals for aircraft door applications. The relationships between rubber response, contact problem and air pressure are assumed as the initial step to understand the risks of air leakage during the early stages of a flight cycle. Through the finite element method, the non-linear boundary problem is investigated with the distinct contact response from two types of door interfaces. The options available within the ABAQUS commercial software are explored to model the seal as nearly incompressible, whereby the limitations are compared for each solution. In a qualitative approach, the simulations use the contact pressure distributions to define the pressure load for air leakage investigations on the door corners.

A Three-Dimensional oil film Temperature Distribution in Tilting Thrust Bearings

1974 ◽  
Vol 16 (2) ◽  
pp. 121-124 ◽  
Author(s):  
A. K. Tieu
Keyword(s):  
Finite Element Method ◽  
Numerical Scheme ◽  
Three Dimensional ◽  
Finite Width ◽  
The Finite Element Method ◽  
Oil Film ◽  
Thrust Bearings ◽  
Pressure Distributions ◽  
Temperature And Pressure ◽  
Thrust Pad

The oil film temperature and pressure distributions of the finite width Michell tilting thrust pad are determined from a numerical scheme based on the finite element method. These computed results correlate very well with those obtained from the experiment.

Reconsideration on Helmholtz-Kirchhoff Integral Solutions for Boundary Points in Radiation Problems

2019 ◽  
Vol 105 (5) ◽  
pp. 827-837
Author(s):  
Kyounghun Been ◽  
Wonkyu Moon
Keyword(s):  
Finite Element Method ◽  
Acoustic Pressure ◽  
The Finite Element Method ◽  
Integration Process ◽  
Rigorous Derivation ◽  
Irregular Surfaces ◽  
Pressure Distributions ◽  
Surface Integration ◽  
Kirchhoff Integral ◽  
Integral Solutions

The Helmholtz-Kirchhoff integral (HKI) formula is very useful when designing transducers because it can be used to predict the acoustic pressure of a radiator at any position given only the acoustic pressure and velocity of the source. Many studies have been carried out to determine how to predict the acoustic pressure distributions generated by radiator sources using the HKI formula and boundary conditions. However, if the surface integration process includes radiator edges or vertices, then it is difficult to predict a consistent acoustic pressure distribution accurately, and the precise HKI formula to solve this problem and rigorous derivation are not known. In this article, to overcome these limitations, a formulation of the HKI for the boundary is proposed. This formulation is based on intuitive considerations and proven mathematically. Using the proposed expression of the HKI formula for the boundary, the acoustic pressures radiated by irregular surfaces were calculated and compared with the distributions obtained by the finite element method and theoretically exact solutions. The results obtained with the proposed formulation of the HKI were confirmed to be more accurate than those of the conventional HKI formula.

Flaw identification for Laplace equation using the linear sampling method

2017 ◽  
Vol 23 (8) ◽  
pp. 1225-1236 ◽  
Author(s):  
SH Dehghan Manshadi ◽  
SM Dehghan Manshadi ◽  
HR Amiri ◽  
S Hamzehei Javaran
Keyword(s):  
Finite Element Method ◽  
Laplace Equation ◽  
Sampling Method ◽  
Qualitative Approach ◽  
Two Dimensional ◽  
The Finite Element Method ◽  
Linear Sampling Method ◽  
Geometrical Features ◽  
Laplace Problem ◽  
Linear Sampling

The present study aims to introduce the linear sampling method for cavity/inclusion detection in a two-dimensional Laplace problem by measuring data on the boundary. This method is categorized as a qualitative approach to image the geometrical features of unknown targets. There has been no specific attempt to apply this method to the identification of cavities/inclusions in the Laplace equation although it has been used in the context of inverse problems such as acoustics, electromagnetism and elastostatics. Therefore, the implementation of the linear sampling method, coupled with the finite element method, is emphasized in this study. A set of numerical simulations on two-dimensional problems is presented to highlight many effective features of the proposed qualitative identification method.

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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