scholarly journals Mathematical modeling in preoperative planning for reconstructive and plastic surgery

2005 ◽  
Vol 52 (3) ◽  
pp. 87-90
Author(s):  
I. Pavlovic ◽  
V. Potkonjak ◽  
S. Djuricic
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Plastic Surgery ◽  
Preoperative Planning ◽  
Simple Procedure ◽  
Mechanical Analysis ◽  
The Finite Element Method ◽  
Three Dimensional Model ◽  
Technical Improvement ◽  
Element Method

Social importance of skin emphasizes an importance of quality of methods of planning for reconstructive and plastic surgery. With modern technical improvement the usage of complex mathematical model based on biomechanical characteristics of tissue is possible. Two and three-dimensional model, expert systems and mechanical analysis are used. In this work we tested the system for mechanical analysis in preoperative planning of a simple procedure of the Z-plastic, named the finite-element method. Computer model simulates tissue coverages. With geometrical data some physical characteristics are added. Complex surface of skin is marked by the grid divided in quadrangular elements. Mechanical consequences and definitive results of surgical procedure are analyzed during the computer simulation of the action of tension of skin and suture material. In our analysis we found the finite-element method of great usefulness and noticed that "surgery simulators" might be an efficient way to speed-up learning curve in reconstructive surgery.

scholarly journals ВЛИЯНИЕ ИЗГИБА ПЛУНЖЕРА НА ИЗМЕНЕНИЕ ОБЪЕМА В ЦИЛИНДРОВОЙ ПОЛОСТИ АВИАЦИОННОГО АКСИАЛЬНО-ПЛУНЖЕРНОГО НАСОСА

2019 ◽  
pp. 88-94
Author(s):  
Владимир Николаевич Доценко ◽  
Иван Григорьевич Лихошерст ◽  
Мелания Николаевна Бурда
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Smooth Function ◽  
Cylinder Block ◽  
Geometrical Parameters ◽  
Contact Deformation ◽  
The Finite Element Method ◽  
Three Dimensional Model ◽  
Rigid Cylinder ◽  
Element Method

In this article, the task is to consider the effect of the piston bending in an axial- piston pump under the action of hydraulic force on the kinematics of the pump. The change in kinematics due to the elastic deformation of the piston is estimated by the axial displacement of the piston face. The study takes into account the bias of the plunger in the gap, the elastic bending deformation of the plunger, the contact deformation of the plunger and the cylinder block. The task is considered on three models: a rigid piston in a rigid cylinder block; deformable piston in a rigid cylinder block; deformable piston, block, shoe, and disk. The values of the displacement of the piston, caused by elastic forces and misalignment in the gap depending on its position were obtained for the first time as a result of the analysis. The problem is solved both analytically and numerically using the finite element method. In the analytical solution of the problem, the piston is represented as a beam supported by pin and roller at the points of contact of the piston with the walls of the cylinder block. The three-dimensional model of the pump is applied to solve the problem by the finite element method, the contact deformation of the piston and the block is considered. According to the simulation results, the displacement of the piston is obtained depending on the position of the piston. The results of modeling an analytical model are presented in the form of a smooth function, and the results of numerical simulation using the finite-element method obtained for several points are interpolated by a smooth function. The conclusions suggest that the greatest deformations are achieved in the piston located at the bottom dead center, and the gap between the piston and the sleeve and the overall stiffness of the contact parts have the greatest effect. The results of the work can be used to correct the geometrical parameters of a heavily loaded aviation axial-plunger pump to reduce flow and pressure pulsations caused by the kinematics of the pump.

scholarly journals Finite element analysis of Bridge Crane Metal Structure Based on ABAQUS

2018 ◽  
Vol 198 ◽  
pp. 01004
Author(s):  
Zhong Meng ◽  
Tong Yifei ◽  
LI Xiangdong
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Metal Structure ◽  
Design Parameters ◽  
Bridge Crane ◽  
The Finite Element Method ◽  
Three Dimensional Model ◽  
Element Analysis ◽  
Operation Conditions ◽  
Element Method

Taking the QD-type (50/10t-31.5) bridge crane as the research object and the finite element method as theoretical basis, the metal structure using ABAQUS software is analyzed. Firstly, the three-dimensional model of the metal structure is established according to the design parameters. Second, the bridge crane under three typical operation conditions is analyzed and the stress and displacement analysis results are presented. And, the strength and stiffness of the crane are verified based on the analysis results. Moreover, the maximum stress and displacement under dangerous conditions of the crane are calculated by theoretical calculation. By comparing the results of the theoretical method and the finite element method. The research can favor to increase the design efficiency.

scholarly journals Numerical Modelling of the Three-Roll Bending Process of a Thin Plate

2020 ◽  
Vol 13 (1) ◽  
pp. 133-136
Author(s):  
Péter Máté ◽  
András Szekrényes
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Method ◽  
Simple Procedure ◽  
Rolling Direction ◽  
Curvature Function ◽  
The Finite Element Method ◽  
Roll Bending ◽  
Bending Process ◽  
Element Method

AbstractThe three-roll bending process is a simple procedure, commonly used in the industry, through which a cylindrical surface can be produced from a sheet plate. This process is mainly controlled through experience and it is described with the finite element method, except for a very few numerical and analytical investigations. The topic of this article is to present a numerical method, through which the curvature function along the rolling direction can be calculated. This article presents the proposed numerical method and its verification with the finite element method. The results of the two numerical methods are in good agreement.

High-Speed Micromilling of Composite and Aluminum Alloy Parts

2021 ◽  
pp. 62-72
Author(s):  
E.V. Patraev ◽  
M.S. Vakulin ◽  
Y.I. Gordeev ◽  
V.B. Yasinsky
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
High Speed ◽  
Experimental Studies ◽  
Three Dimensional ◽  
The Finite Element Method ◽  
Three Dimensional Model ◽  
Workpiece Material ◽  
High Productivity ◽  
Element Method

The paper deals with the design of the cutting part of complex-profile cutters with high productivity and surface quality. Numerical experiments carried out using the finite element method made it possible to determine the stresses and strains in the layer of the cut material when machining with multifaceted milling cutters of a new type and indirectly estimate the specific cutting forces. The required dimensions and shape of the cutting wedge are set with account for various geometric parameters of the cutting part, properties of the workpiece material, and cutting conditions. This made it possible to obtain a three-dimensional model of an end mill with a trapezoidal tooth and 700 cutting edges. Experimental studies also showed a change in the morphology of chips with a size of about 2 microns, which is in good agreement with the results of preliminary estimates by the finite element method. The productivity of processing with milling cutters of a new design can be improved by increasing the number of single cutting cycles up to4000–6000 s–1.

Front Car Door Modal Analysis Based on Finite Element Method

2011 ◽  
Vol 383-390 ◽  
pp. 7418-7421
Author(s):  
Li Sun ◽  
Yong Chen Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Modal Analysis ◽  
Traffic Noise ◽  
Three Dimensional ◽  
The Finite Element Method ◽  
Three Dimensional Model ◽  
Vehicle Structure ◽  
The Right ◽  
Element Method

The car door modal analysis was an important method to obtain its dynamic characteristics. In order to analyze the natural frequency of the door, avoid resonance with the other vibration sources in the vehicle structure and reduce traffic noise, the right front door of a vehicle was made modal analysis based on the finite element method. First, the car door three-dimensional model was established in the CATIA, then it was imported into the HyperMesh to mesh, at last, imported into the Nastran, and the related settings was made to calculate the 7 modal frequencies of the door. By analysis of the vibration shape chart, the door low stiffness positions are found to provoid the reliable reference for optimizing the door design.

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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