Performance Analysis of Multirecess Angled-Surface Slot-Compensated Conical Hydrostatic Bearing

2013 ◽  
Vol 135 (4) ◽  
Author(s):  
Xiao-Bo Zuo ◽  
Jian-Min Wang ◽  
Zi-Qiang Yin ◽  
Sheng-Yi Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Performance ◽  
Mathematic Model ◽  
Operating Conditions ◽  
Width Ratio ◽  
The Finite Element Method ◽  
Obvious Effect ◽  
Hydrostatic Bearing ◽  
Better Than

Angled-surface slot-compensated hydrostatic bearing (ASHB) is a novel type of hydrostatic bearing which is potentially applicable in rotary tables. However, it has not been sufficiently studied in available literature. In this paper the mathematic model for ASHB was built and solved by the finite element method (FEM). The influence of semicone angle on static and dynamic performance characteristics was theoretically investigated. The simulated results have been compared with that of the traditional fixed slot-compensated hydrostatic bearing (FSHB) on the same geometric and operating conditions. Results show that the performance of ASHB is better than that of FSHB; the studied bearing with a large semicone angle is superior in power consumption; the clearance width ratio of the restricting gap to the bearing gap has an obvious effect on bearing performance.

Research of throwing areols of underground pipeline in permafrost

2021 ◽  
pp. 21-30
Author(s):  
T. S. Sultanmagomedov ◽  
◽  
R. N. Bakhtizin ◽  
S. M. Sultanmagomedov ◽  
T. M. Halikov ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Experimental Study ◽  
Finite Element ◽  
Strain State ◽  
Operating Temperature ◽  
Operating Conditions ◽  
Loss Of Stability ◽  
Underground Pipeline ◽  
The Finite Element Method ◽  
Permafrost Thawing

Study is due to the possibility of loss of stability of the pipeline in the process of pumping a product with a positive operating temperature and the formation of thawing halos. The article presents the ways of solving the thermomechanical problem of pipeline displacement due to thawing. The rate of formation of a thawing halo is investigated depending on the initial temperatures of the soil and the pumped product. The developed monitoring system makes it possible to study the rate of occurrence of thawing halos in the process of pumping the product. An experimental study on the formation of thawing halos around the pipeline was carried out on an experimental model. A thermophysical comparative calculation of temperatures around the pipeline on a model by the finite element method has been carried out. Keywords: underground pipeline; permafrost; thawing halo; monitoring; operating conditions; stress–strain state.

scholarly journals Agustin de Betancourt’s Mechanical Dredger in the Port of Kronstadt: Analysis through Computer-Aided Engineering

2018 ◽  
Vol 8 (8) ◽  
pp. 1338 ◽  
Author(s):  
José Rojas-Sola ◽  
Eduardo De la Morena-De la Fuente
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
3D Model ◽  
Russian Empire ◽  
Computer Aided Engineering ◽  
Operating Conditions ◽  
The Finite Element Method ◽  
Safety Coefficient ◽  
Computer Aided ◽  
The Russian Empire

This article analyzes the first self-propelled floating dredging machine designed and executed by Agustín de Betancourt in 1810 to dredge the port of Kronstadt (Russia). With this objective, a study of computer-aided engineering (CAE) has been carried out using the parametric software Autodesk Inventor Professional, consisting of a static analysis using the finite element method, of the 3D model which is reliable under operating conditions. The results have shown that the system of inertia drums proposed by Betancourt manages to dissipate the tensions between the different elements, locating the highest stresses in the links of the bucket rosary, specifically at the point of contact between links. Similarly, the maximum displacements and the greatest deformations (always associated with these points of greater stress), are far from reaching the limits of breakage of the material used in its construction, as well as the safety coefficient of the invention, confirming that the mechanism was oversized, as was generally the case at the time. This analysis highlights the talent of the Spanish engineer and his mastery of mechanics, in an invention, the first of its kind worldwide, which served the Russian Empire for many years.

scholarly journals Waveguide Structures with Improved Cut-off Frequency and Bandwidth

2019 ◽  
Vol 9 (2S3) ◽  
pp. 82-85
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Wave Transmission ◽  
The Finite Element Method ◽  
Transmission Characteristics ◽  
Ridge Waveguides ◽  
Ridge Structures ◽  
Double Ridge ◽  
Better Than ◽  
Element Method

The wave transmission characteristics of rectangular, double-ridge, trapezoidal-ridge and anti-trapezoidal ridge waveguides are analyzed using the finite-element method. The cut-off wavelength and attenuation of these waveguides are calculated. The result shows that anti-trapezoidal ridge waveguides perform better than rectangular, double-ridge and trapezoidal-ridge waveguides. The variation of bandwidth and attenuation with respect to change in the angle of physical ridge structures has been studied while migrating from rectangular to anti-trapezoidal ridge structures.

The Simulated Calculation and Optimizing Experimental Research of the Residual Stress of the Heavy Rail Straightening

2011 ◽  
Vol 704-705 ◽  
pp. 296-301
Author(s):  
Lin Chen ◽  
Jian Guo Wang ◽  
Ge Li
Keyword(s):  
Finite Element Method ◽  
Residual Stress ◽  
Finite Element ◽  
Regression Analysis ◽  
3D Model ◽  
Real Field ◽  
The Finite Element Method ◽  
Simulated Calculation ◽  
Heavy Rail ◽  
Better Than

The finite element 3D model of heavy rail roller complex straightening is established by the finite element method in this paper.The straightening process is optimized by orthogonal experimentation and regression analysis. The formative mechanics and the regulation of the residual stress in the process of straightening are researched. The results of the simulation show that: whatever is on the basement of the residual stress or flatness, the new schedule is better than the real field one, residual stress is controlled within 250Mpa.

scholarly journals FEM Calculations in Analysis of Steel Subsea Water Injection Flowlines Designing Process

2018 ◽  
Vol 25 (3) ◽  
pp. 84-93 ◽  
Author(s):  
Michał Wodtke ◽  
Artur Olszewski ◽  
Artur Wójcikowski
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Water Injection ◽  
Operating Conditions ◽  
Theoretical Research ◽  
Sea Waves ◽  
The Finite Element Method ◽  
Strength Parameters ◽  
Coiled Tubing ◽  
Calculation Models

Abstract The article describes the result of theoretical research aimed at assessing the loads and operating conditions of a Coiled Tubing pipeline injecting water, suspended to the mining platform of Lotos Petrobaltic. For this purpose, appropriate calculation models have been developed using the Finite Element Method (FEM), taking into account the nature of the analyzed object and its loads. The analyzes were carried out for two pipes (previously operated and newly proposed) differing in geometrical and strength parameters. The research was carried out for selected directions of load on the pipeline (originating from sea waves) and various variants of attaching the suspended pipeline to the mining platform.

COMPARATIVE ANALYSIS OF THE SYSTEM APM WINMACHINE AND CAE ABAQUS FOR CALCULATING THE STRENGTH OF A WELDED JOINT

2020 ◽  
Vol 5 ◽  
pp. 28-32
Author(s):  
V.V. LEONTYEV ◽  
E.V. KONDRATOVA ◽  
V.P. KOLOMIYCHENKO
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Comparative Analysis ◽  
Strain State ◽  
Safety Margin ◽  
Operating Conditions ◽  
The Finite Element Method ◽  
Stress Strain ◽  
Stress Strain State ◽  
Element Method

Traditional methods for calculating welded joints are based on approximate methods for determining the forces that occur in the joint. This leads to inaccuracies in the definition of stress. In addition, this approach does not allow obtaining a complete picture of the stress-strain state of the joint. All this leads to the need to increase the coefficient of safety margin and, as a result, to increase the cost of construction. The proposed method of calculating the connection using the finite element method allows us to determine the stresses in all the elements of the connection very accurately. This makes it possible to obtain a reliable picture of the stress-strain state of all elements of the connection. As a result, it is possible to reduce the complexity of creating a compound and its mass. The finite element method should be used for calculating critical connections with complex operating conditions. An example of calculating such a connection is considered. A comparative analysis of the results of calculating the t-joint using the arm Joint module Of the WinMachine arm system and the Abaqus finite element package is performed.

Topology Optimization and Dynamic Performance of a Bike Frame With Dampers

2003 ◽  
Author(s):  
Yuan Mao Huang ◽  
Jiung-Cheng Pan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Simulated Annealing ◽  
Topology Optimization ◽  
Dynamic Performance ◽  
Structural Topology ◽  
The Finite Element Method ◽  
Design Variables ◽  
Joint Location ◽  
Annealing Algorithms

This study utilizes the topology optimization with the finite element method and the simulated annealing algorithms to optimize the structure and the dynamic performance of a bike frame with dampers. Design domains, loadings and boundary conditions of bike frames are defined. Joint locations of a damper with the front and the rear frames and the joint location of the front and the rear frames are considered as design variables. The transient response and the acceleration of a bike on a sinusoid curved road surface are analyzed. Effects of the joint locations and the stiffness of frames on the dynamic performance are studied. The structural topology of frames and joint locations of a bike are recommended to improve the dynamic performance.

scholarly journals Influence of Smart Spring Support Parameters on Vibration Characteristics of Three Support Shafting

2020 ◽  
Vol 10 (21) ◽  
pp. 7752
Author(s):  
Miao-miao Li ◽  
Liang-liang Ma ◽  
Chuan-guo Wu ◽  
Zhuo Li ◽  
Ru-peng Zhu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Performance Test ◽  
Vibration Characteristics ◽  
The Finite Element Method ◽  
Test Bed ◽  
Obvious Effect ◽  
Shaft System ◽  
Spring Support ◽  
Element Method

Smart spring support is a kind of active damping device based on piezoelectric material. It can effectively suppress the vibration of a shaft system in an overly critical state by changing the stiffness and damping of the support. The support parameters have a significant impact on the vibration of the system. By studying the influence of the smart spring support parameters on the vibration characteristics of the transmission shaft system, the support parameters can be configured more reasonably so that the vibration of the transmission system can be reduced as much as possible. Based on the finite element method, this paper studies the influence of the stiffness, damping and mass of the smart spring support on the vibration characteristics of the three-support shafting. Firstly, the smart spring shafting test bed is built, and the vibration reduction performance test of the smart spring is carried out to verify the damping effect of the smart spring. Then, the shafting dynamic model is established by the finite element method, and the inherent characteristics of the system are analyzed. Finally, the influence of the stiffness, damping, mass and other parameters of the smart spring support on the dynamic response of the system is studied. The results show that increasing the stiffness of the smart spring support can effectively reduce the vibration amplitude of the system. The damping of the smart spring support has no obvious effect on the vibration of the shafting. The smaller the mass of the smart spring support, the more favorable the system is.

Study on the Clearance of Automotive Hub-Bearings

2011 ◽  
Vol 42 (10) ◽  
pp. 28-34
Author(s):  
Yuanxin Luo ◽  
Yongqing Wang ◽  
Xingchun Yan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Analytical Method ◽  
Dynamic Performance ◽  
Assembly Process ◽  
The Finite Element Method ◽  
Fundamental Study ◽  
Rotating Speed ◽  
Initial Setting ◽  
Bearing Assembly

The hub-bearing assembly is one of the fundamental components of modern vehicles. A bad hub-bearing can cause phantom noises or ghost vibrations at sporadic points during the drive. In this paper, effects on the clearance of the bearing are investigated by both the analytical method and the Finite Element Method (FEM). It is found that the assembly process, the initial setting clearance, the rotating speed, the thermo-expansion contribute to the clearance of automotive hub bearing. The fundamental study is the basis for analyzing the dynamic performance and noise of the bearing. Also, it can be extended to optimize the assembly process.

scholarly journals INVESTIGATION OF THE STRESS CONDITION OF RIVETED JOINTS BY FINITE ELEMENT METHOD

2020 ◽  
pp. 32-36
Author(s):  
V. Leont'ev ◽  
E. Kondratova ◽  
V. Kolomiychenko
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Strain State ◽  
Operating Conditions ◽  
The Finite Element Method ◽  
Stress Strain ◽  
Approximate Methods ◽  
Stress Strain State ◽  
Riveted Joints ◽  
Element Method

traditional methods of calculation of rivet joints are based on very approximate methods of determining the forces arising in the connection. This leads to serious inaccuracies in the determination of stresses. In addition, this approach makes it impossible to calculate equivalent stresses and obtain a complete picture of the stress-strain state of the joint. All this leads to the need to increase the factor of safety and, as a consequence, increase the number or diameter of rivets, which leads to an increase in the weight of the structure and its rise in price. The proposed method of calculating the connection by the finite element method allows to determine the stresses in all elements of the connection very accurately. This makes it possible to obtain a reliable picture of the stress-strain state of all elements of the compound. As a result, it is possible to reduce the complexity of the compound and its mass by reducing the number of rivets. The finite element method should be used to calculate critical compounds with complex operating conditions. The example of calculation of such connection is considered.

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