scholarly journals Analysis of the stressed-deformed condition of the bearing installed

2020 ◽  
pp. 107-117
Author(s):  
Stanislav Maiorov ◽  
◽  
Iuliia Lagunova ◽  
Keyword(s):  
Calculation Model ◽  
Central Processor ◽  
The Finite Element Method ◽  
Connecting Rod ◽  
Jaw Crusher ◽  
Acceptable Range ◽  
Dependent Model ◽  
Bearing Assembly ◽  
Parameter Dependent ◽  
Model Programs

Introduction. The article considers the calculation of the strength of a bearing mounted on the connecting rod of a jaw crusher, taking into account all workloads. ISSN 0536-1028 «Известия вузов. Горный журнал», № 3, 2020 117 Object problems. When creating particularly large machines and systems, in the case of their 3D-modeling and detailed study, we are faced with an increased load on the central processor of the computer, as well as on the graphics and RAM modules, which leads to a significant slowdown in the design process and calculations particular. Research aim is to consider the task of selecting a simpler and "easier" for the calculation model programs, not difficult to parameterize, compared with the original bearing model, but providing accuracy in the calculation in an acceptable range of errors. The research also aims to analyze the stress-strain state of the bearing assembly. The main methods. In the calculations, the finite element method was used. Specialized software package APM WinMachine was also used. Computing experiment conducted. Conclusions. The results of a computational experiment satisfy the requirements and can be used to solve further problems of designing bearing assemblies. In the future, a parameter-dependent model can be created to facilitate the calculation using any type of bearing

scholarly journals Statistical analysis of stress-strain state of bearing jaw crusher

2020 ◽  
Vol 1 (2) ◽  
pp. 159-171
Author(s):  
Yuliya Andreevna LAGUNOVA ◽  
◽  
Stanislav Anatol’evich MAYOROV ◽  
Gennadiy Alexeevich BOYARSKIH ◽  
◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Computational Experiment ◽  
Strain State ◽  
Structural Model ◽  
Calculation Model ◽  
Central Processor ◽  
Stress Strain ◽  
Jaw Crusher ◽  
Stress Strain State ◽  
Parameter Dependent

The relevance of the work. When creating particularly large machines and systems, in the case of their 3D modeling and detailed study, the load on the central processor of the computer, as well as on the graphic and RAM modules, increases, which significantly slows down the design process and calculations. In the article, a statistical analysis of the stress-strain state of the jaw crusher bearing is carried out to establish the correspondence of the theoretical and actual structural models taking into account all workloads. The objectives of the study. Consider the task of selecting a simpler and “easier” for the calculation model programs, not difficult to parameterize, compared with the original bearing model, but providing accuracy in the calculation in an acceptable range of errors. To analyze the stress-strain state of the bearing assembly with various geometric parameters. Research methodology. In the calculations, the finite element method was used. Used specialized software package APM WinMachine. A computational experiment was conducted. A correlation analysis of the theoretical and actual structural model of the bearing is carried out. Results. Mathematical models of the metal structures of bearings of various sections are given and the locations of the highest stresses are identified. Calculation errors and correlation dependencies of stresses are established taking into account the Pearson, Fisher criteria and the construction of the Taylor series. Conclusions. The results of a computational experiment satisfy the requirements and can be used to solve further problems of designing bearing assemblies. In the future, a parameter-dependent model can be created that makes it easier to calculate using any type of bearing

Analysis of a new process of forging a 2017A aluminium alloy connecting rod

2021 ◽  
pp. 1-32
Author(s):  
Grzegorz Winiarski ◽  
Anna Dziubinska
Keyword(s):  
Aluminium Alloy ◽  
The Finite Element Method ◽  
Connecting Rod ◽  
Sand Cast ◽  
Input Material ◽  
Lower Strain ◽  
New Process ◽  
Billet Material ◽  
Hammer Forging ◽  
Deform 3D

Abstract The paper presents the results of a theoretical analysis of a new process of hammer forging of a connecting rod and the technology currently used. In the industry at present connecting rods are forged from extruded rods. The new forging technology assumes the use of a billet in the form of a cast preform. For the calculations, it has been assumed that the billet material will be a Ø30 x 148 mm rod and a cast preform. Two variants of preforms have been modelled, from which products of the assumed geometry with different degree of strain are obtained. Calculations were made using the finite element method in the Deform 3D program. The input material was 2017A aluminium alloy in the form of rods and sand cast preforms. On the basis of the conducted research it was found that the use of cast preforms reduces material waste by about 80% in relation to the technology of forging from the bar, and reduces the energy consumption of the process by about 75%. Both geometrical variants of the forging preforms ensure obtaining a forging with the assumed shape and dimensions, although forging from the forging preform with a smaller degree of strain seems to be a safer variant in terms of the possibility of cracking of the material. This is supported by the lower strain and Cockcroft-Latham integral values.

An Affine Parameter Dependent Controller of an Helicopter for Various Forward Velocity Conditions

2015 ◽  
Vol 789-790 ◽  
pp. 1067-1072
Author(s):  
Ismail Hakki Şahin ◽  
Coşku Kasnakoğlu
Keyword(s):  
Linear Models ◽  
Online Measurement ◽  
Linear Parameter ◽  
Forward Flight ◽  
H Infinity ◽  
Reference Tracking ◽  
Affine Parameter ◽  
Dependent Model ◽  
Single Controller ◽  
Parameter Dependent

In this paper, we address the design of a controller that accomplishes stabilization and reference tracking at various flight conditions by using linear helicopter models. The suggested controller is in the form of an H-infinity gain-scheduler, and is used for stabilization and reference tracking for the 4 axis (heave, pitch, roll and yaw) autopilot. Based on the linear models given for the Puma helicopter, an approximate affine parameter dependent model has been built. Then, a linear parameter dependent controller is synthesized which stabilizes the affine parameter dependent helicopter model. By doing so, a single controller achieves stabilization and reference tracking of a family of linear models by scheduling the controller gains based on the online measurement of the scheduling parameter, which is the forward velocity. Moreover, the affine parameter dependent controller is fitted into the linear models. It is observed that this single parameter dependent controller successfully stabilizes a family of linear helicopter model at different forward flight conditions.

Modelling and Analysis of Elastic and Thermal Deformations of a Hydrodynamic Radial Journal Bearing

2016 ◽  
Vol 674 ◽  
pp. 127-132 ◽  
Author(s):  
Aki Linjamaa ◽  
Arto Lehtovaara ◽  
Marke Kallio ◽  
Sven Söchting
Keyword(s):  
Combustion Engine ◽  
Calculation Model ◽  
Journal Bearings ◽  
The Finite Element Method ◽  
Lubrication Film ◽  
Thermal Deformations ◽  
Hydrodynamic Calculations ◽  
Bearing Loads ◽  
Loaded Side ◽  
Rigid Surfaces

Journal bearings are widely used in heavy industry and in internal combustion engine applications. There is a need to increase the power density of various machine parts which leads to increased bearing loads and reduced lubrication film thicknesses. This type of development may increase deformations on the bearing surfaces which need to be considered in the bearing design process.The main purpose of this work was to develop a parameterized calculation model for hydrodynamic radial journal bearings which takes into account elastic and thermal deformations of the bearing surfaces. Hydrodynamic calculations were based on the numerical solving of the Reynolds equation by assuming rigid surfaces. Elastic and thermal deformations of the bearing and shaft surfaces were calculated by using the finite element method. It is concluded that elastic and thermal deformations are partly canceling each other out at the loaded side of the bearing and depending on the sliding speed and the external normal force either one of them could be more significant.

An Impact Analysis of Turbine Guide Bearing Stiffness on Rotating Parts’ Transverse Vibration Characteristics

2011 ◽  
Vol 117-119 ◽  
pp. 222-230
Author(s):  
Yi Zhu ◽  
Xi De Lai ◽  
Li Fa Wang
Keyword(s):  
Large Scale ◽  
Impact Analysis ◽  
Hydraulic Turbine ◽  
Calculation Model ◽  
Vibration Characteristics ◽  
Francis Turbine ◽  
Lateral Vibration ◽  
The Finite Element Method ◽  
Bearing Stiffness ◽  
The Impact

A vibration calculation model for a large-scale hydraulic turbine group is built to act on the unbalanced force between the rotor and the runner. Take the Francis turbine group for example. Using the finite element method, the units lateral vibration characteristics of rotating components were calculated and analyzed. The paper discusses the impact of location and the guide bearing stiffness on the lateral vibration characteristics of the unit. Based on the elastic supporting models, the paper also compares the results of the guide bearing stiffness modified simultaneously and respectively. Results show that the guide bearing stiffness has a significant impact on the lateral vibration characteristics of the location of the unit, which provides a reference for the reduction of vibration and the optimization of the supporting structure of the turbine unit.

scholarly journals CGC/saturation approach: A new impact-parameter dependent model

2016 ◽  
Vol 948 ◽  
pp. 1-18 ◽  
Author(s):  
Carlos Contreras ◽  
Eugene Levin ◽  
Irina Potashnikova
Keyword(s):  
Impact Parameter ◽  
Dependent Model ◽  
Parameter Dependent

scholarly journals A NEW DELAY PARAMETER DEPENDENT ON VARIABLE ANALYSIS PERIODS AT SIGNALIZED INTERSECTIONS. PART 1: MODEL DEVELOPMENT

Transport ◽  
2008 ◽  
Vol 23 (1) ◽  
pp. 31-36 ◽  
Author(s):  
Ali Payidar Akgüngör
Keyword(s):  
Model Development ◽  
Traffic Signals ◽  
Signalized Intersections ◽  
Signalized Intersection ◽  
Delay Model ◽  
Delay Models ◽  
Dependent Model ◽  
New Formulation ◽  
Parameter Dependent

Delay is an important factor in the optimization of traffic signals and the determination of the level of service of a signalized intersection. This paper proposes a methodology and a new formulation to identify the delay parameter in signalized intersection delay models. In this study, the delay parameter is modeled as a function of analysis period instead of a fixed value used by the existing delay models. Therefore, the proposed delay model including new delay parameter can produce more reasonable delay estimations at signalized intersections for variable time periods. A comparative study of the proposed time‐dependent model against the existing four different models was performed to present the improvements in this model.

Sign in / Sign up

Export Citation Format

Share Document