scholarly journals Determining and Analysing Support Conditions at Variable Construction of Crankshafts

2018 ◽  
Vol 1 (1) ◽  
pp. 553-560 ◽  
Author(s):  
Krzysztof Nozdrzykowski ◽  
Zenon Grządziel ◽  
Jozef Harušinec
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Research Subject ◽  
Elastic Deformations ◽  
Study Results ◽  
Reaction Forces ◽  
Support Conditions ◽  
Angle Of Rotation ◽  
Element Method

Abstract The article presents study results of the influence of crankshaft construction changes on the choice of support conditions allowing to eliminate deflections and elastic deformations of crankshafts under their self-weight. For the purpose of this study we implemented a programme for strength calculations Nastran FX 2010 which enables modelling the research subject with a finite element method and counting the value if reaction forces ensuring zero value of deflections on main journals at a change in the crankshaft’s angle of rotation.

scholarly journals Determination of dynamic impact factor for continuous girder bridge due to vehicle braking force by finite element method and experimental

2017 ◽  
Vol 39 (2) ◽  
pp. 149-164
Author(s):  
Nguyen Xuan Toan ◽  
Tran Van Duc
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Impact Factors ◽  
Dynamic Impact ◽  
Bending Vibration ◽  
Continuous Girder Bridge ◽  
Reaction Forces ◽  
Girder Bridge ◽  
Dynamic Impact Factor ◽  
Element Method

In this study, the finite element method (FEM) is used to investigate the dynamic response of continuous girder bridge due to moving three-axle vehicle . Vertical reaction forces of axles that change with time make bending vibration of girder significantly  increase. The braking in the first span is able to create response in other spans. In addition, the dynamic impact factors are investigated by both FEM and experiment for Hoa Xuan bridge. The results of this study provide an improved understanding of the bridge dynamic behavior and can be used as additional references for bridge codes by practicing engineers.

scholarly journals Prediction of Viscoelastic Pavement Responses under Moving Load and Nonuniform Tire Contact Stresses Using 2.5-D Finite Element Method

2020 ◽  
Vol 2020 ◽  
pp. 1-16 ◽  
Author(s):  
Chaoyang Wu ◽  
Hao Wang ◽  
Jingnan Zhao ◽  
Xin Jiang ◽  
Qiu Yanjun ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Moving Load ◽  
Contact Stresses ◽  
Point Load ◽  
Dynamic Responses ◽  
Study Results ◽  
Tensile Strains ◽  
Strain Responses ◽  
Element Method

This study developed two-and-half dimensional (2.5-D) finite element method (FEM) to predict viscoelastic pavement responses under moving loads and nonuniform tire contact stresses. The accuracy of 2.5-D FEM was validated with two analytical solutions for elastic and viscoelastic conditions. Compared to three-dimensional (3-D) FEM, the computational efficiency of the 2.5-D method was greatly improved. The effects of loading pattern and speed on pavement surface deflection and strain responses were analyzed for asphalt pavements with four different asphalt layer thicknesses. The analyzed pavement responses included surface deflections, maximum tensile strains in the asphalt layer, and maximum compressive strains on top of subgrade. The loading patterns have influence on the mechanical responses. According to the equivalent rule, the point load, rectangle type, and sinusoid-shape contact stresses were studied. It was found that the point load caused much greater pavement responses than that of the area-based loading. When the tire loading was simplified as uniform contact stress in rectangular area, the maximum tensile strains in the asphalt layer varied with the width/length ratio of contact area. Additionally, it was shown that the dynamic responses of pavement structure induced by the sinusoid-shape contact stresses and realistic nonuniform stresses were quite similar to each other in all the cases. The pavement strain responses decreased as the speed increased due to viscoelastic behavior of asphalt layer. The study results indicate that asphalt pavement responses under moving load can be calculated using the proposed 2.5-D FEM in a fast manner for mechanistic-empirical pavement design and analysis.

Plate Buckling Analysis Using the Linear Finite Element Method

1997 ◽  
Author(s):  
Thomas Persson ◽  
Daniel H. Suchora
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Small Subset ◽  
Flat Plates ◽  
Element Analysis ◽  
Uniform Compression ◽  
Linear Elastic ◽  
Aspect Ratios ◽  
Support Conditions ◽  
Element Method

Abstract The objective of this study was to develop new solutions for linear elastic buckling coefficients of rectangular flat plates with support conditions not previously found in the literature. Critical buckling coefficients were found for rectangular flat plates subjected to uniform compression on two opposite edges with one partially supported unloaded edge using the finite element method. Plates with different aspect ratios and with varying support length on the unloaded edges were analyzed. Currently, no solutions are available in the literature for plates subjected to uniform compression and with partially supported unloaded edges. The method developed in this work was verified on problems where closed form mathematical solutions exist. An engineer will be able to use the solutions developed in this work in the design of components that are susceptible to instability failures. Another benefit of this work is to demonstrate to practicing engineers that reliable instability results can be obtained by using standard finite element analysis (FEA) methods. This work considers a small subset of instability problems but the FEA method utilized herein can be effectively used to model a large class of practical instability problems.

The Numerical Simulation of Workpiece Clamping

2014 ◽  
Vol 474 ◽  
pp. 218-223 ◽  
Author(s):  
Jarmila Oravcová
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Numerical Experiments ◽  
Simulation Models ◽  
Contact Points ◽  
Reaction Forces ◽  
The Creation ◽  
Made In ◽  
Element Method

The paper deals with the effects of clamping forces on the workpiece during clamping fixture. It describes an experiment using numerical simulation. With numerical experiments we wanted to find out displacement of basic points of the model and changes in the reaction forces in contact points. In the experiment it was considered with initial inaccuracies of contact points. Verification of their effect was made on simulation models of workpieces, which were made in software ANSYS. The creation of the model was used finite element method.

scholarly journals Modeling of the Evolution of the Microstructure and the Hardness Penetration Depth for a Hypoeutectoid Steel Processed by Grind-Hardening

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1182
Author(s):  
Yu Guo ◽  
Minghe Liu ◽  
Mingang Yin ◽  
Yutao Yan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Cellular Automata ◽  
Penetration Depth ◽  
Hardened Layer ◽  
Grind Hardening ◽  
Study Results ◽  
1045 Steel ◽  
Hardness Penetration Depth ◽  
Element Method

Grind-hardening processing is an emerging approach that combines the grinding and surface quenching process. During the process, the hardened layer—mainly martensite—is produced on the surface of the workpiece to achieve the purpose of surface strengthening. Above all, the surface temperature field of the hypoeutectoid-1045 steel workpiece was determined by finite element method for fully revealing the formation mechanism of the hardened layer. Further, the cellular automata approach was applied to dynamically simulate the transformation of both austenitization and martensitization from the initial microstructure. The hardness penetration depth was also predicted. Finally, a grind-hardening experiment was conducted to assess the theoretical study. Results showed that a combination of the finite element method and the cellular automata approach can effectively simulate the microstructure transformation of hardened layer. The microstructure and the hardness penetration depth were affected by the maximum grinding temperature and the heating rate. Research on the influence of grinding parameters showed that the hardness penetration depth increased as the depth of the wheel cut and feeding speed increased. Experiments revealed that the difference between predicted value and experimental value of the hardness penetration depth varied between 2.83% and 7.31%, which confirmed the effectiveness of the predicted model.

Strength and Stability Analysis on Storage Silo of Concrete Mixing Plant

2012 ◽  
Vol 204-208 ◽  
pp. 3132-3136
Author(s):  
Xin Xiang Zhou ◽  
Yan Ling Tang ◽  
Cheng Liu ◽  
Guang Yu Hu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stability Analysis ◽  
Global Stability ◽  
Static Deformation ◽  
Three Dimension ◽  
Research Subject ◽  
Static Behavior ◽  
Main Research ◽  
Element Method

This paper takes the under-frame of 300t storage silo produced by a certain company as the main research subject,static behavior of the under-frame is analyzed by three-dimension finite element method to generalize the rule of static deformation and stress distribution.Eigenvalues can be obtained by stability analysis and global stability and the whole structure is checked.All of the above provide a reliable reference for the design of storage silo.

Modeling and Analyzing for Rotor System with Imbalance-Misalignment Coupling Faults Based on Nonlinear Finite Element Method

2013 ◽  
Vol 312 ◽  
pp. 292-295
Author(s):  
Fu Ze Xu ◽  
Xue Jun Li ◽  
Guang Bin Wang ◽  
Yi Lin He
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Rotor System ◽  
Nonlinear Finite Element ◽  
Rolling Element Bearing ◽  
Nonlinear Finite Element Method ◽  
Time Frequency ◽  
Coupling Faults ◽  
Study Results ◽  
Element Method

This thesis constructs the dynamical model of the imbalance-misalignment coupling faults and the finite element model of the rotor system which are supported by rolling element bearing. It analyses the impacts from the coupling faults to the system on the basis of nonlinear finite element method, dynamic theory and Newmark-beta numerical integration method. It also studies the influence of the unbalance, misalignment and coupling faults to the system by applying the dynamic response chart and time-frequency properties. The study shows that there exist unstable high and low harmonic components, the unbalanced signal overshadowed by misalignment. It also discovers that besides the working frequency, there also exist tow times frequency and other high doubling components on the response spectra with two times frequency for the most. All those study results provide some theoretical reference for the fault diagnosing of the rotor bearing system, the vibration control and the stability research.

Topic of the issue: Determination of the processing error during face milling of flat surfaces

2020 ◽  
pp. 9-22
Author(s):  
V.L. Kiselev ◽  
A. S. Pronin
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Geometric Parameters ◽  
The Finite Element Method ◽  
Elastic Deformations ◽  
Flat Surfaces ◽  
The Relationship ◽  
Center Distance ◽  
Element Method

Using the finite element method and CAD SolidWorks Simulation, the relationship between the geometric parameters of workpieces and the error in processing flat surfaces of levers caused by elastic deformations of the workpiece due to the application of holding force is established. In this paper, we developed a method for determining the error of processing flat surfaces that occurs from fixing, compiled a model for determining the error by the finite element method, and calculated the error of processing flat surfaces that occurs from fixing for workpieces with different geometric parameters. As a result of the study, the relationship between the value of the center distance of workpieces and the error in processing flat surfaces of levers caused by elastic deformations of the workpiece due to the application of holding forces was determined.

scholarly journals Finite Element Method Analysis Applied to Different Foundations Structures Systems

2021 ◽  
Vol 7 (3) ◽  
pp. 18-24
Author(s):  
Dr. Eng. Guillaume Hervé poh’sie* ◽  
◽  
Eng. Linda Kevine Guiameugne Guabiapsie ◽  
Eng. Gabrielle Laure Djeukoua Nathou ◽  
Eng. Giuseppe Cardillo ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Real Life ◽  
Bending Moment ◽  
Fine Sand ◽  
Winkler Model ◽  
Study Results ◽  
Fixed Base ◽  
Soil Flexibility ◽  
Element Method

In the conventional static analysis of building frames, the base is idealised on rigid supports and the building is subdivided into three parts namely, the superstructure, the foundation and the ground soil, before design. In real life situations, the soil underneath the building undergoes deformations which may alter the performance of the structure. In this paper, it is studied the effect of soil type and foundation type on the response of a building frame system with both fixed base and flexible base. The Winkler model of soil-structure interaction is adopted to study the influence of soil flexibility and foundation rigidity on a 4 storey RC building with a regular plan resting on three types of soils namely, the light peat marshy ground, wet clay and medium gravel with fine sand. Three types of foundations are considered in the study: isolated footings, tied foundation and the raft (with and without overhangs) foundations. Winkler model is developed using springs by Finite Element Method in SAP2000. The settlement, the bending moment, the shear force and the axial force are the parameters placed forth for the comparative study. Results obtained reveal an increase in the response of the structure with respect to the soil flexibility and foundation rigidity.

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