scholarly journals Strength analysis and modal analysis for the load-bearing structure of the equipment for opening and compartmentalizing watering furrows, using 1D

2021 ◽  
Vol 286 ◽  
pp. 03008
Author(s):  
Petru Cardei ◽  
Raluca Sfiru ◽  
Marius Oprescu ◽  
Vergil Muraru ◽  
Cornelia Muraru
Keyword(s):  
Finite Element ◽  
Flow Stress ◽  
Structural Model ◽  
Equivalent Stress ◽  
Relative Displacement ◽  
Strength Analysis ◽  
Displacement Fields ◽  
Load Bearing ◽  
Bearing Structure

The paper proposes the analysis of the load-bearing structure of the equipment for opening and compartmentalizing watering furrows (EOCFW), using a 3D structural model, built with 1D finite element. Based on information from the experimental results of the EOCFW equipment, the load-bearing structure is supported and loaded. The results of the linear static analysis of the structure consist of the distributions of the relative displacement fields and the equivalent voltage in the structure. Also, the own frequencies of the structure and the deformed forms of the structure are obtained when it vibrates in its own ways with the lowest own frequencies. It shows how these results can be used. The field of relative displacements is used to assess the effects on the quality of the soil processing performed. The equivalent stress field is used to estimate the safety factor of the structure, by reference to the flow stress of the material from which the structure is built. The first four or five own frequencies are important for the prognosis of possible vibration regimes with resonance, their explanation and their amelioration. It emphasizes the ease with which the model can be modified to obtain improved or even optimized variants.

scholarly journals Analysis of the resistance frame of the equipment for opening and compartmentalizing watering furrows, using 3D finite elements

2021 ◽  
Vol 286 ◽  
pp. 03009
Author(s):  
Petru Cardei ◽  
Marius Oprescu ◽  
Nicolae Constantin ◽  
Ștefan-Sorin Biriș ◽  
Sebastian Muraru
Keyword(s):  
Structural Analysis ◽  
Finite Elements ◽  
Stress Field ◽  
Structural Model ◽  
Equivalent Stress ◽  
Relative Displacement ◽  
Cad Cam ◽  
Bearing Structure ◽  
Cam Model

The proposed article sets out the results of the finite element structural analysis for the open and compartmentalised watering furrow equipment (OCWFE). It uses a 3D structural model with 3D finite elements. The analysis set out in the article is made in order to determine the field of relative displacement and equivalent stress in the load-bearing structure of the OCWFE. The structural model is generated in CAD-CAM. For the structural analysis, it is necessary the CAE model, which is obtained from the CAD-CAM model, mainly by eliminating gaps and interferences, but also by the techniques of realizing the contact between the components of the assembly and a careful mashing of the structure. The structural model thus created is supported and loaded in accordance with the experimental results from the literature. The relative displacement field and the equivalent stress field within the resistance frame of the OCWFE is obtained following the linear static analysis. The field of relative displacements is used to assess the effects on the quality of the work performed. The equivalent stress field is used to estimate the safety factor of the structure, by reference to the flow stress of the material from which the structure is built.

The Finite Element Analysis on the Compression Splicing Position of Strain Clamp in Guy Tower

2014 ◽  
Vol 680 ◽  
pp. 249-253
Author(s):  
Zhang Qi Wang ◽  
Jun Li ◽  
Wen Gang Yang ◽  
Yong Feng Cheng
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Finite Element Model ◽  
Equivalent Stress ◽  
Element Model ◽  
Element Analysis ◽  
Elastic Plastic ◽  
The Finite Element Analysis

Strain clamp is an important connection device in guy tower. If the quality of the compression splicing position is unsatisfied, strain clamp tends to be damaged which may lead to the final collapse of a guy tower as well as huge economic lost. In this paper, stress distribution on the compressible tube and guy cable is analyzed by FEM, and a large equivalent stress of guy cable is applied to the compression splicing position. During this process, a finite element model of strain clamp is established for guy cables at compression splicing position, problems of elastic-plastic and contracting are studied and the whole compressing process of compressible position is simulated. The guy cable cracks easily at the position of compressible tube’s port, the inner part of the compressible tube has a larger equivalent stress than outside.

Design and Optimization of FCEV Subframe by Integrated Applications of Hypermesh, UG and ADAMS Multi-Platform

2011 ◽  
Vol 328-330 ◽  
pp. 213-219
Author(s):  
Jun Liao
Keyword(s):  
Finite Element ◽  
Aluminum Alloy ◽  
Comparative Analysis ◽  
Element Model ◽  
Strength Analysis ◽  
Optimal Size ◽  
Virtual Model ◽  
Design And Optimization ◽  
New Type

The UG model and finite element model of FCEV subframe are established, and original subframe is simulated in all kinds of ADAMS environment, which result in the force of the conditions obtained. Then the virtual model is build, stiffness and strength analysis are conducted, and a new type of subframe structure is designed based on the analysis results. Magnesium alloy and aluminum alloy are used in optimization of this new structure for the optimal size. Through the comparative analysis on strength, stiffness, mode shape and quality of the new subframe and the original one, it was verified that the new subframe design is reasonable and feasible.

Research on Load Bearing Structure of the Hydraulic Climbing Device of Caliper Type

2012 ◽  
Vol 580 ◽  
pp. 263-265
Author(s):  
Kai Liu ◽  
Hai Ying Zhou ◽  
Ming Jiang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Euler Equation ◽  
Axial Force ◽  
Axial Displacement ◽  
Load Bearing ◽  
Calculation Results ◽  
Method Formulation ◽  
Bearing Structure ◽  
Element Method

According to the characteristics of hydraulic climbing system of caliper type, the load bearing structure of hydraulic climbing system of caliper type is optimized. A precise finite element method formulation is used in calculating stability of load bearing structure taking both axial force and axial displacement into consideration. An example is given to show the calculation results of the precise finite element method formulation is matched with the calculation results of classic Euler Equation. Finally some useful suggestions are given.

Assessment of Concrete Quality of Load-Bearing Structure of the Bridge across Otava River No. 121-006 near Zvikov after Fifty Years of Operation in Severe Environmental Conditions

2016 ◽  
Vol 722 ◽  
pp. 72-78 ◽  
Author(s):  
Stanislav Rehacek ◽  
David Čítek ◽  
Jiri Kolisko ◽  
Petr Huňka
Keyword(s):  
Compression Strength ◽  
Environmental Conditions ◽  
Visual Inspection ◽  
Load Bearing ◽  
Concrete Carbonation ◽  
Concrete Mix ◽  
Concrete Quality ◽  
Bearing Structure

This paper is introducing results of diagnostic survey of bridge no. 121-006 across Otava river near Zvikov [1], focusing on assessment of quality of concrete mix used for load-bearing structure of the bridge after more than 50 years of operation and assessment of reconstruction works (monolithic assembly of central joints of main fields) executed in 1994 [2]. Visual inspection of monolithic assembly joints, comparison of depth of concrete carbonation and thickness of top layer of reinforcement concrete and concrete compression strength are presented in this paper.

Finite Element Analysis of the Tractor Front Axle Housing Based on ANSYS

2011 ◽  
Vol 105-107 ◽  
pp. 168-171
Author(s):  
Dong Fang Hu ◽  
Wen Hui Liu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Equivalent Stress ◽  
Vertical Displacement ◽  
Front Axle ◽  
Weak Links ◽  
Strength Analysis ◽  
Element Analysis ◽  
Design And Optimization ◽  
Structural Improvement

This paper shows the static strength analysis of the tractor front axle housing by using of the finite element analysis software ANSYS, visually shows equivalent stress and strain distribution and vertical displacement distribution of the front axle housing. At the same time it also shows the analysis results of the model processing, the results of accuracy and reliability, and the weak links of the structure. By analyzing the weakest link and the difference in strength between each node for the overall structure in the condition, it can provide a direction and theoretical basis for the design and optimization of geometric entities. And the results of the analysis may be as the basis for structural improvement. In this way, it can be verified that using computer virtual software for product development is positive.

The Influence of Operating Loads on the State of Stress and Strain in Selected Load-Bearing Elements of a Tower-Type Headgear Structure in the Light of the Experimental Data / Wpływ Obciążeń Eksploatacyjnych Na Stan Naprężenia Oraz Przemieszczenia Elementów Nośnych Konstrukcji Basztowej Wieży Szybowej W Świetle Przeprowadzonych Eksperymentów

2012 ◽  
Vol 57 (4) ◽  
pp. 831-842
Author(s):  
Stanisław Wolny
Keyword(s):  
Experimental Data ◽  
Numerical Analysis ◽  
The State ◽  
Strength Analysis ◽  
Stress And Strain ◽  
Structural Elements ◽  
Load Bearing ◽  
State Of Stress ◽  
Strain Stress ◽  
Bearing Structure

Abstract In order that the ultimate state method should be applied to the strength analysis of the tower-type headgear structure, it is required that the design loads and endurance parameters be first established. For that purpose the characteristics of loads experienced by structural elements of the headgear structure are required (Wolny, 2012) as well as the numerical analysis of stresses and strains. Thus obtained results are verified through stress (strain) measurements taken in structural elements subjected to highest loads found on the basis of the stress map derived from numerical analysis, being the subject matter of the present study. Strain (stress) measurements are taken on the beams located at the floor level +65.00 m on which the winding machines are positioned (drive shaft bearings, stators in the electric motors), as shown schematically in Fig. 2. The strength analysis by numerical methods is restricted to those elements of the load bearing structure in the headgear at the level (+65.00) where the strain (stress) and measurements are taken and where loads are measured that give rise to the maximal strain changes (Wolny, 2012). Alongside the strain (stress) measurements in the load-bearing elements of the headgear structure, measurements are taken of horizontal displacements at selected points of the structure with the use of an interferometric radar IBIS-S. Results of the repeated numerical analysis of the state of stress, restricted to those elements of the load bearing structure in the tower-type headgear where the maximal loads are registered (Wolny, 2010), agree well with experimental data obtained from tests done on a real object. Therefore, the numerical analyses of the state of stress and strain in the load-bearing elements of the headgear structures operated in the Polish collieries lead us to the assumption that when analysing the geometry of the driving systems in the winding gear, the structures on which the elements of the winder installation are positioned ought to be treated as rigid. This conclusion is further corroborated by displacement measurements by geodetic methods taken on selected points of the tower-type headgear structure. An interesting point is that the tower-type headgear structure above its first floor level will behave as a rigid solid.

Finite Element Analysis on Structure of a New Torsional Vibration Damper

2012 ◽  
Vol 215-216 ◽  
pp. 861-866
Author(s):  
Guo Yang Wu ◽  
Jun Jie Yang ◽  
Cheng Rong Jiang ◽  
Yun Song Li ◽  
Guo Yun Li
Keyword(s):  
Finite Element ◽  
Torsional Vibration ◽  
Dynamic Load ◽  
Static Load ◽  
Equivalent Stress ◽  
Dynamic State ◽  
Strength Analysis ◽  
Vibration Damper ◽  
Element Analysis ◽  
Time Curve

Based on the practical working state and load conditions of a car, the stress-strain and its strength in static and dynamic state of a new torsional vibration damper were calculated and analyzed with the finite element theory and tools, providing reliable data and a simple and accurate research method of strength for its practical application.Through strength analysis, the maximum equivalent stress of main parts of damper under static load and the stress time curve under dynamic load were obtained. By comparing the analytical results under static and dynamic load, it shows that all parts of the damper meet the strength requirements under the dynamic load, and that the maximum stress value of main parts under idle speed conditions is higher than that of running conditions, which is consistent with the actual working condition; while under the static load, the rivets did not meet the strength requirement. In conclusion, two feasible methods were proposed to improve the strength of rivets. It is verified that this damper can meet working strength requirements at last.

scholarly journals Inspection of Quality of Concrete of Load-bearing Structure, Bridge No. 121-007 Across Vltava River at Zvikov

2016 ◽  
Vol 156 ◽  
pp. 466-472 ◽  
Author(s):  
Rehacek Stanislav ◽  
Citek David ◽  
Kolisko Jiri ◽  
Simunek Ivo
Keyword(s):  
Load Bearing ◽  
Bearing Structure

Finite element analysis and structural design of axially uniform-loaded nut

2017 ◽  
Vol 52 (4) ◽  
pp. 215-225
Author(s):  
Zhao Chun-jiang ◽  
Liu Yong-feng ◽  
Zhang Fei-tao ◽  
Wang Zheng-yi ◽  
Gui Hai-lian
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Model ◽  
Equivalent Stress ◽  
Peak Stress ◽  
Element Model ◽  
Working Process ◽  
Element Analysis ◽  
Finite Element Software ◽  
Heavy Equipment

Axially heavy-loaded screw pairs are widely used in rolling mill press systems and other heavy equipment. During the working process, the nut is pressed at both ends, which causes equivalent stress at the thread roots in a U-shaped distribution along the height. Thread roots at the ends tend to suffer fracture failure when the equivalent stress is too great. In this article, the finite element software ANSYS is used to establish a 3D model of screw pairs and analyse bearing characteristics. A new structure based on the results of finite element analysis, which improves U-shaped stress distribution, is proposed for the axially uniform-loaded nut, with a different strain–displacement relationship between the nut matrix and the thread teeth. Such a relationship can greatly reduce peak stress at the thread roots of the nut on both ends. Experiments are conducted on the nut using the electrometric method. Results are compared with the finite element results to directly verify the reliability of the finite element model of ordinary screw pairs and indirectly verify the reliability of the structural model of new screw pairs.

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