scholarly journals APPLICATION OF RIGID LINKS IN STRUCTURAL DESIGN MODELS

2017 ◽  
Vol 13 (3) ◽  
pp. 119-137 ◽  
Author(s):  
Sergey Yu. Fialko
Keyword(s):  
Finite Element ◽  
Structural Design ◽  
Stiffness Matrix ◽  
Sparse Matrix ◽  
Element Model ◽  
Rigid Bodies ◽  
Design Models ◽  
Adjacency Graph ◽  
Direct Solvers ◽  
The Finite Element Model

A special finite element modelling rigid links is proposed for the linear static and buckling analysis. Unlike the classical approach based on the theorems of rigid body kinematics, the proposed approach preserves the similarity between the adjacency graph for a sparse matrix and the adjacency graph for nodes of the finite element model, which allows applying sparse direct solvers more effectively. Besides, the proposed approach allows significantly reducing the number of nonzero entries in the factored stiffness matrix in comparison with the classical one, which greatly reduces the duration of the solution. For buckling problems of structures containing rigid bodies, this approach gives correct results. Several examples demonstrate its efficiency.

A Complaint Mechanism with Freedom Degrees of One Movement and Two Rotations

2014 ◽  
Vol 551 ◽  
pp. 444-447
Author(s):  
Sheng Lin ◽  
Xi Kong ◽  
Chun Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Element Model ◽  
Stiffness Matrix ◽  
Degrees Of Freedom ◽  
Compliant Mechanism ◽  
Element Model ◽  
Theory Analysis ◽  
The Finite Element Model

Based on the method of Freedom and Constraint Topology (FACT), a compliant mechanism with 3 degrees of freedom is designed. The 3 DOF are one movement and two rotations, which belongs to Case 3, Type 2. The whole stiffness matrix of the compliant mechanism is obtained. The finite element model is established for statics analysis. The results of theory analysis and finite element method are closed.

Finite Element Analysis of Engraving Machine as a Whole

2011 ◽  
Vol 411 ◽  
pp. 54-58
Author(s):  
Tao Feng ◽  
Xiao Li Jin
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Design ◽  
Optimization Design ◽  
Element Model ◽  
Modeling Method ◽  
Joint Surface ◽  
Dynamic Characterization ◽  
Element Analysis ◽  
The Finite Element Model

Based on the analytical theories of the joint surface, finite element modeling method of two kinds of joint about rails and bolts were studied. The finite element model of the engraving machine is built and its static and dynamic characterization is analyzed by the universal ANSYS. By this way, unreasonable structural design of engraving machine can be conducted, which will provide support for the optimization design of the structure. The correctness of the modeling method of joint surface is confirmed.

scholarly journals Stiffness and Elastic Deformation of 4-DoF Parallel Manipulator with Three Asymmetrical Legs for Supporting Helicopter Rotor

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Jialin Song ◽  
Yang Lu ◽  
Yongli Wang ◽  
Yi Lu
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Elastic Deformation ◽  
Stiffness Matrix ◽  
Parallel Manipulator ◽  
Element Model ◽  
Helicopter Rotor ◽  
Elastic Deformations ◽  
The Finite Element Model ◽  
Type Composite

The stiffness and elastic deformation of a 4-DoF parallel manipulator with three asymmetrical legs are studied systematically for supporting helicopter rotor. First, a 4-DoF 2SPS + RRPR type parallel manipulator with two linear SPS type legs and one RRPR type composite leg is constructed and its constraint characteristics are analyzed. Second, the formulas for solving the elastic deformation and the stiffness matrix of the above mentioned three asymmetrical legs are derived. Third, the formulas for solving the total stiffness matrix and the elastic deformation of this manipulator are derived and analyzed. Finally, its finite element model is constructed and its elastic deformations are solved using both the derived theoretical formulas and the finite element model. The theoretical solutions of the elastic deformations are verified by that of the finite element model.

Structural Design and Analysis on Frame of Blueberry Harvesters Based on ANSYS

2010 ◽  
Vol 26-28 ◽  
pp. 794-799
Author(s):  
Qian Wang ◽  
Zhi Peng Li ◽  
Dao Qiang Wang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Static Analysis ◽  
Working Conditions ◽  
Structural Design ◽  
Mechanical Characteristics ◽  
Element Model ◽  
Frame Structure ◽  
Ansys Software ◽  
The Finite Element Model

The frame of blueberry harvesters is quite different from other vehicles. In this article, the design for whole frame structure is elaborated. According to the mechanical characteristics of the frame, materials are selected and manufacturability requirements are limited. Based on PRO/E software, accurate model of the frame of blueberry harvesters is established. And then, on the basis of ANSYS software, the finite element model of frame of blueberry harvesters is established to carry out static analysis on full-loaded and distortion working conditions. Results meet the strength requirements and displacement requirements, so it verifies the reasonableness of the design of frame.

scholarly journals Direct image-based micro finite element modelling of bone tissue

2020 ◽  
Vol 329 ◽  
pp. 03072
Author(s):  
Oleg Gerasimov ◽  
Nikita Kharin ◽  
Viktoriya Yaikova ◽  
Evgeniy Statsenko ◽  
Tatyana Baltina
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Stiffness Matrix ◽  
Element Model ◽  
Direct Image ◽  
Data Simulation ◽  
Plane Element ◽  
Calculation Results ◽  
The Finite Element Model ◽  
Tomography Data

In the paper, a method for the direct image-based creation of the finite element model from images is presented. Image information is taken into account during the calculation of the element stiffness matrix. In this case, material heterogeneity can be included directly in the finite element model. For this purpose, the hypothesis about the correlation between pixel values and elastic properties was used. Four nodes plane element was built. The element can be used with the quantitative phase or scanning electron images and computed tomography data. Simulation for bone data performed. The influence of pixel on the error estimate was studied. The method to parallelize the calculation of the stiffness matrix is presented. As an example, a slice of bone was used in the calculation. Results for average stress distribution for the origin and improved mesh are presented.

The Dynamics of Rotor-Bearing Systems With Axial Torque—A Finite Element Approach

1980 ◽  
Vol 102 (1) ◽  
pp. 158-161 ◽  
Author(s):  
E. S. Zorzi ◽  
H. D. Nelson
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Stiffness Matrix ◽  
Variational Approach ◽  
Element Model ◽  
Equation Of Motion ◽  
Torsional Stiffness ◽  
Finite Element Equation ◽  
Element Approach ◽  
The Finite Element Model

This study investigates the effect of constant axial torque on the dynamics of rotorbearing systems using a finite element model. The finite element equation of motion is formulated using the variational approach and the inclusion of axial torques gives rise to an incremental torsional stiffness matrix. This matrix is circulatory since the system is non-conservative. The finite element model is used to determine the static buckling torques and the critical speeds of a uniform shaft for short and long bearings.

Simulation Analysis of Thermodynamics on the Belt Spindle of the Machining Center

2013 ◽  
Vol 690-693 ◽  
pp. 3240-3243
Author(s):  
Qiang He ◽  
An Ling Li ◽  
Yong Zhang ◽  
Ye Jun ◽  
Xin Sheng Li
Keyword(s):  
Thermal Analysis ◽  
Finite Element ◽  
Temperature Rise ◽  
Structural Design ◽  
High Speed ◽  
Simulation Analysis ◽  
Element Model ◽  
The Finite Element Method ◽  
Machining Center ◽  
The Finite Element Model

By taking the belt spindle of the machining center high speed and high precision as the research object, using the finite element method, the Solidworks software is used to make the thermal analysis. In this paper, we define the boundary conditions and thermal load of the spindle thermal analysis, and establish the finite element model. The steady-state thermal analysis and temperature rise is simulated, and the temperature distribution is predicted by using Solidworks software. The results show that the structural design of the belt spindle is reasonable, and the temperature rise is in the control range.

Redrawing Operation a Star Shape from Cylindrical Shape Using Experimental and FE Analysis

2020 ◽  
Vol 38 (1A) ◽  
pp. 25-32
Author(s):  
Waleed Kh. Jawad ◽  
Ali T. Ikal
Keyword(s):  
Finite Element ◽  
Effective Strain ◽  
Element Model ◽  
Cylindrical Shape ◽  
Element Analysis ◽  
Punch Force ◽  
Maximum Value ◽  
Element Simulation ◽  
Blank Sheet ◽  
The Finite Element Model

The aim of this paper is to design and fabricate a star die and a cylindrical die to produce a star shape by redrawing the cylindrical shape and comparing it to the conventional method of producing a star cup drawn from the circular blank sheet using experimental (EXP) and finite element simulation (FES). The redrawing and drawing process was done to produce a star cup with the dimension of (41.5 × 34.69mm), and (30 mm). The finite element model is performed via mechanical APDL ANSYS18.0 to modulate the redrawing and drawing operation. The results of finite element analysis were compared with the experimental results and it is found that the maximum punch force (39.12KN) recorded with the production of a star shape drawn from the circular blank sheet when comparing the punch force (32.33 KN) recorded when redrawing the cylindrical shape into a star shape. This is due to the exposure of the cup produced drawn from the blank to the highest tensile stress. The highest value of the effective stress (709MPa) and effective strain (0.751) recorded with the star shape drawn from a circular blank sheet. The maximum value of lamination (8.707%) is recorded at the cup curling (the concave area) with the first method compared to the maximum value of lamination (5.822%) recorded at the cup curling (the concave area) with the second method because of this exposure to the highest concentration of stresses. The best distribution of thickness, strains, and stresses when producing a star shape by

Analysis of Hydroelectric Unit’s Upper Bracket Based on Test and FEM

2014 ◽  
Vol 721 ◽  
pp. 131-134
Author(s):  
Mi Mi Xia ◽  
Yong Gang Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Element Model ◽  
The Finite Element Method ◽  
Ansys Software ◽  
Element Analysis ◽  
Hydroelectric Unit ◽  
The Finite Element Analysis ◽  
Strain Rosette ◽  
The Finite Element Model

To research the load upper bracket of Francis hydroelectric unit, then established the finite-element model, and analyzed the structure stress of 7 operating condition points with the ANSYS software. By the strain rosette test, acquired the data of stress-strain in the area of stress concentration of the upper bracket. The inaccuracy was considered below 5% by analyzing the contradistinction between the finite-element analysis and the test, and match the engineering precision and the test was reliable. The finite-element method could be used to judge the stress of the upper bracket, and it could provide reference for the Structural optimization and improvement too.

Analysis of Premium Connection of Connecting and Sealing Ability Loaded by Axial Tensile Loads

2012 ◽  
Vol 268-270 ◽  
pp. 737-740
Author(s):  
Yang Yu ◽  
Yi Hua Dou ◽  
Fu Xiang Zhang ◽  
Xiang Tong Yang
Keyword(s):  
Finite Element ◽  
Contact Pressure ◽  
Tensile Load ◽  
Element Model ◽  
Sealing Ability ◽  
Axial Tensile ◽  
High Level ◽  
Maximum Contact ◽  
Contact Pressures ◽  
The Finite Element Model

It is necessary to know the connecting and sealing ability of premium connection for appropriate choices of different working conditions. By finite element method, the finite element model of premium connection is established and the stresses of seal section, shoulder zone and thread surface of tubing by axial tensile loads are analyzed. The results show that shoulder zone is subject to most axial stresses at made-up state, which will make distribution of stresses on thread reasonable. With the increase of axial tensile loads, stresses of thread on both ends increase and on seal section and shoulder zone slightly change. The maximum stress on some thread exceed the yield limit of material when axial tensile loads exceed 400KN. Limited axial tensile loads sharply influence the contact pressures on shoulder zone while slightly on seal section. Although the maximum contact pressure on shoulder zone drop to 0 when the axial tensile load is 600KN, the maximum contact pressure on seal section will keep on a high level.

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