Finite Element Simulation of Multilayer Metal Cylinder Head Gaskets

2006 ◽  
Author(s):  
Mario Durando ◽  
Domenico Petronio ◽  
Giuseppe Rivilli ◽  
Gabriele Virzi` Mariotti
Keyword(s):  
Cylinder Head ◽  
Fem Analysis ◽  
Flexible Tool ◽  
Actual Case ◽  
Mesh Topology ◽  
Element Simulation ◽  
Calculation Methodology ◽  
Complex Models ◽  
Definition Of ◽  
Multilayer Metal

The ABAQUS gasket elements are an efficient and flexible tool to study gasket applications. Nevertheless their usage is not limited to gasket analysis, but it provides an effective improvement in structural analysis. The results point out that both the predicted contact pressure and the predicted stress distribution depend on the mesh topology. Several combinations of mesh dimension and topology are investigated. The purpose is the definition of a calculation methodology and the demonstration of the application efficiency. Complex models analysis highlights that the defined methodology represents an effective tool for the design and the optimisation of the head gasket, the cylinder head and the engine block. The methodology is then applied to an actual case. A layout modification to prevent a sealing issue is validated by the FEM analysis. The modification was introduced in the actual component. The qualitative and quantitative evidences provided by the calculation were confirmed by the experimental results obtained by colour films (not running engine with assembly loads at room temperature) and by the test bench (actual working conditions).

The Evolution of Psychoanalytic Practice with Psychotic Patients

2002 ◽  
Vol 4 (1) ◽  
pp. 31-43
Author(s):  
Sophie de Mijolla-Mellor
Keyword(s):  
Special Kind ◽  
Main Hypothesis ◽  
Actual Case ◽  
Definition Of ◽  
Psychoanalytic Method

This paper deals with the evolution of the psychoanalytic practice with psychotic patients beginning with Freud's scepticism about the transference capacities of those patients to a new definition of a special kind of psychotic transference. The main hypothesis is that the actual case of psychotics within a psychoanalytic cure has modified the psychoanalytic method itself, even in the field of neuroses. Within the framework and, more specifically, in the case of schizophrenics, this paper develops some reflections on the evolution of the three following concepts: transference/countertransference, communication and interpretation, and reality.

A New Finite Element Simulation by Genetic Search Algorithm

2013 ◽  
Vol 791-793 ◽  
pp. 1318-1321
Author(s):  
Lei Meng
Keyword(s):  
Single Crystal ◽  
Applied Stress ◽  
Search Algorithm ◽  
Fem Analysis ◽  
Stress Axis ◽  
Direction Parallel ◽  
Genetic Search ◽  
Microstructure Observation ◽  
Element Simulation ◽  
Circular Holes

By means of measuring creep curves, microstructure observation and FEM analysis of the stress field near the hole; an investigation has been made into the influence of the defects on creep behaviors and microstructure evolution of single crystal nickel-based superalloys. Results show that the creep lifetimes and plasticity of the single crystal nickel based superalloys are obviously decreased by microstructure defects. During high temperature creep, the stress isoline near the holes region displays the feature of the acetabuliform distribution, and possesses the bigger stress value at 45° angle direction relative to the applied stress axis. That results in the γ phase transformed into the rafted structure at 45° angle direction relative to the applied stress axis, and the circular holes defects are elongated into the ellipse in shape along the direction parallel to the applied stress axis.

scholarly journals THEORETICAL-EXPERIMENTAL ASSESMENT OF BRAKING SISTEMS FOR INCLINED LIFTS ACCORDING TO EN 81:22-2014.

2016 ◽  
Author(s):  
Enrique Alcalá ◽  
Beatriz Valles Fernandez ◽  
Angel Luis Martin López
Keyword(s):  
Simulation Model ◽  
Relative Displacement ◽  
Dynamical Behaviour ◽  
Emergency Braking ◽  
Braking System ◽  
Calculation Methodology ◽  
Norm Series ◽  
Definition Of ◽  
Optimal Behaviour

The inclined lifts, in case of emergency braking, can experience high longitudinal decelerations that can lead to passengers’ collisions with lift walls and interior elements. In 2014 the CEN/TC10 WG1 published the part 22 of the norm series 81 with regard to the construction elements and installation of electrical lifts with inclined trajectory. This norm stablishes, amongst other requirements, the maximum and minimum deceleration levels in both longitudinal and vertical directions. Both requirements, in opposite senses and the definition of the braking system, do not cause design difficulties in case of high slopes, but in case of lifts with the slope under a certain level they can be needed, to guarantee the fulfilment of the norm, elements that allow and additional relative displacement between the braking system and the cabin. To define the performances and the optimal behaviour of these systems it has been defined a simulation model of the dynamical behaviour of the lift under the conditions of the norm tests. Additionally, in this work it is presented a calculation methodology to define the cabin allowable weight corridor, for each braking effort made by each safety gear model, and the simulations have been validated with the results of tests with different braking efforts, weights and lift slopes. The present work has been performed in cooperation with Thyssen Krupp Elevadores with the aim of improving the knowledge of the brake dynamics of inclined lifts.DOI: http://dx.doi.org/10.4995/CIT2016.2016.2173

Multispectral Image Compression, Intelligent Analysis, and Hierarchical Search in Image Databases

2012 ◽  
Vol 3 (4) ◽  
pp. 1-30
Author(s):  
Stuart Rubin ◽  
Roumen Kountchev ◽  
Mariofanna Milanova ◽  
Roumiana Kountcheva
Keyword(s):  
Object Representation ◽  
Image Databases ◽  
Multispectral Images ◽  
Invariant Representation ◽  
Flexible Tool ◽  
New Approach ◽  
Analysis And Evaluation ◽  
Hierarchical Search ◽  
Efficient Processing ◽  
Definition Of

In this paper, a new approach is offered for the efficient processing and analysis of groups of multispectral images of the same objects. It comprises several tools: the Modified Inverse Pyramid Decomposition; the invariant object representation with Modified Mellin-Fourier transform, and the hierarchical search in image databases, for which the invariant representation is used. The new approach permits the definition of a large number of parameters, which are used for object analysis and evaluation. When combined with the KASER expert system, this approach yields a flexible tool for the analysis of multispectral images of the same object.

scholarly journals Numerical and Experimental Investigation on the Structural Behaviour of a Horizontal Stabilizer under Critical Aerodynamic Loading Conditions

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
R. Sepe ◽  
R. Citarella ◽  
A. De Luca ◽  
E. Armentani
Keyword(s):  
Fem Analysis ◽  
Experimental Tests ◽  
Aerodynamic Load ◽  
Honeycomb Core ◽  
Structural Behaviour ◽  
Research Activity ◽  
Composite Sandwich ◽  
Load Vector ◽  
Definition Of ◽  
Transfer Moulding

The aim of the proposed research activity is to investigate the mechanical behaviour of a part of aerospace horizontal stabilizer, made of composite materials and undergoing static loads. The prototype design and manufacturing phases have been carried out in the framework of this research activity. The structural components of such stabilizer are made of composite sandwich panels (HTA 5131/RTM 6) with honeycomb core (HRH-10-1/8-4.0); the sandwich skins have been made by means of Resin Transfer Moulding (RTM) process. In order to assess the mechanical strength of this stabilizer, experimental tests have been performed. In particular, the most critical inflight recorded aerodynamic load has been experimentally reproduced and applied on the stabilizer. A numerical model, based on the Finite Element Method (FEM) and aimed at reducing the experimental effort, has been preliminarily developed to calibrate amplitude, direction, and distribution of an equivalent and simpler load vector to be used in the experimental test. The FEM analysis, performed by using NASTRAN code, has allowed modelling the skins of the composite sandwich plates by definition of material properties and stack orientation of each lamina, while the honeycomb core has been modelled by using an equivalent orthotropic plate. Numerical and experimental results have been compared and a good agreement has been achieved.

Impediments to the Recovery of Restitution by Crime Victims

1990 ◽  
Vol 5 (2) ◽  
pp. 127-140 ◽  
Author(s):  
Alan T. Harland ◽  
Cathryn J. Rosen
Keyword(s):  
Criminal Justice ◽  
Criminal Justice System ◽  
Justice System ◽  
Crime Victims ◽  
Actual Case ◽  
Policy Makers ◽  
Technical Data ◽  
Victims Of Crime ◽  
Definition Of ◽  
Case Dispositions

Restitution is unique among criminal justice policies by virtue of the widespread support it has attained from many diverse constituencies. Restitution has received such universal praise as a panacea for victims of crime that in recent years a number of American jurisdictions have adopted legislation that creates a presumptive norm that restitution be awarded in appropriate cases. Despite popular support for its increased use and enactment of enabling legislation, restitution continues to be underutilized in actual case dispositions. The authors suggest that the underuse problem will not be cured and the powerful potential that restitution holds as a criminal justice sanction will not be realized until a consensus regarding the definition of restitution is achieved, significant gaps in the technical data about how restitution is effectuated are closed, and practical impediments to awarding and collecting restitution are dissolved. These goals, in turn, cannot be met until policy makers confront and begin to resolve the inherent conflicts posed when a restorative sanction, such as restitution, is pursued in a criminal justice system that is primarily punitive in nature.

Three-Dimensional FEM Analysis of Sensitive Mechanism of Airflow Level Posture Sensor Based on Thermoelectric Coupling

2011 ◽  
Vol 271-273 ◽  
pp. 211-215
Author(s):  
Ming Ming Ji ◽  
Lin Hua Piao ◽  
Bai Hua Li
Keyword(s):  
Finite Element ◽  
Model Building ◽  
Three Dimensional ◽  
Fem Analysis ◽  
Three Dimensional Model ◽  
Three Dimensional Modeling ◽  
Equation Solving ◽  
Dimensional Modeling ◽  
Element Simulation ◽  
Simulation Based

Using ANSYS program, the finite element simulation based on thermoelectric coupling is conducted by a series of procedures, such as three-dimensional model building of airflow level posture sensor according to the actual size of the proportion, network modifying, loads applying and equation solving. The sensitive mechanism of airflow level posture sensor is explained by finite element method. The numerical results show that compared with two-dimensional modeling, the simulation result of three-dimensional modeling and thermoelectric analysis methods are more comprehensive and accurate, which provides more reliable basis for practical research of the airflow level posture sensor.

scholarly journals Thermomechanical Fatigue Analysis of Cylinder Head

2017 ◽  
Vol 50 (3) ◽  
pp. 182-185 ◽  
Author(s):  
Anton Leppänen ◽  
Asko Kumpula ◽  
Joona Vaara ◽  
Massimo Cattarinussi ◽  
Juho Könnö ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Finite Element ◽  
Gas Exchange ◽  
Cylinder Head ◽  
Conjugate Heat Transfer ◽  
Material Model ◽  
Post Processing ◽  
Thermal Boundary Conditions ◽  
Element Simulation ◽  
Fatigue Model

The finite element simulation of a cylinder head has been carried out with Abaqus Standard using Z-mat material model, with thermal boundary conditions coming from combined conjugate heat transfer and gas-exchange simulations. The fatigue post-processing of results has been done with Z-post software using ONERA fatigue model. The resulting lifetime values have been found out to correspond well to observations from the field.

scholarly journals Coarse-to-fine Image Co-segmentation with Intra and Inter Rank Constraints

2018 ◽  
Author(s):  
Lianli Gao ◽  
Jingkuan Song ◽  
Dongxiang Zhang ◽  
Heng Tao Shen
Keyword(s):  
Objective Function ◽  
Similarity Measure ◽  
Feature Learning ◽  
Object Proposal ◽  
Feature Similarity ◽  
Complex Models ◽  
Similarity Graph ◽  
Rank Constraints ◽  
Definition Of ◽  
Coarse To Fine

Image co-segmentation is the problem of automatically discovering the common objects co-occurring in a set of relevant images and segmenting them as foreground simultaneously. Although a bunch of approaches have been proposed to address this problem, many of them still suffer from certain limitations, e.g., supervised feature learning and complex models, which hinder their capability in the real-world scenarios. To alleviate these limitations, we propose a novel coarse-to-fine co-segmentation (CFC) framework, which utilizes the coarse foreground and background proposals to learn a robust similarity measure of the features in an unsupervised way, and then devises a simple objective function based on the definition of image co-segmentation. Specifically, we first generate superpixels for all the images and extract their features. Instead of using existing distance metrics, we utilize object proposal methods to generate coarse foreground and background to learn a similarity measure of superpixels to construct a robust feature similarity graph. Then we design an intuitive objective function to learn a segmentation similarity graph which should be consistent with feature similarity graph and also be able to co-segment the superpixels in the images into either foreground and background. This objective function can be further reformulated as a graph learning problem with intra and inter rank constraints. Experiments on two commonly used image datasets (iCoseg and MSRC) demonstrate that CFC outperforms other state-of-the-art methods. Notably, this performance is achieved by using only HSV feature.

scholarly journals METHODS FOR MODELS PARAMETERS ESTIMATE TO SOLVE PROBLEMS ON 3D RECONSTRUCTION OF REAL OBJECTS COMPLEX MODELS

2016 ◽  
Vol 2016 (3) ◽  
pp. 233-242 ◽  
Author(s):  
Владислав Колякин ◽  
Vladislav Kolyakin ◽  
Владимир Аверченков ◽  
Vladimir Averchenkov ◽  
Максим Терехов ◽  
...  
Keyword(s):  
Computer Games ◽  
Three Dimensional ◽  
3D Models ◽  
Model Parameters ◽  
Complex Objects ◽  
Image Brightness ◽  
Real Objects ◽  
Complex Models ◽  
Three Dimensional Models ◽  
Definition Of

Virtual threedimensional (3 D) models of complex objects are used in many fields of science and engineering, such as architecture, industry, medicine, robotics. Besides, 3D models are used in geoinformation systems, computer games, virtual and supplemented reality and so on. Three dimensional models can be formed in dif-ferent ways, one of which consists in 3 D reconstruc-tion. One of the stages of the 3 D reconstruction of complex models of real objects is a definition of the mathematical models of geometric primitives emphasized on the image. One of the ways for the estimate of model parameters is a method of Hough vote and its modifications – Hough probabilistic transformation, Hough random transformation, Hough hierarchical transformation, phase space blurriness, use of a gra-dient of image brightness and so on. As an alternative way for models selection is a choice of suitable points from a set of data.

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