New construction of cycloidal gear unit made of plastics

Working Pressure ◽

Maximum Value ◽

Hydraulic Machines ◽

Load Carrying ◽

New Construction ◽

Cycloidal gears constitute the main working unit of the fluid power gerotor machine. The paper presents a way of increasing the load-carrying capacity of cycloidal unit made of plastic. The aim has been reached through design and material modifications. As a result of those modifications, a design concept of the cycloidal gear system, which is different from the structures previously produced, has been created. The introduced modifications are based on the theoretical analysis of stress and deformations that occur in cycloidal gears during their operation. The analysis was conducted by means of the finite element method. Although the main focus was on analyzing the mechanism behind the deformations, an attempt was also made at extending the application scope for finite element method. The analysis by means of finite element method has been conducted for plastic and steel at the same time. This is result of showed design in which plastics and steel form the construction together one integral part. As a result of the analysis, the maximum value of the working pressure at which hydraulic gerotor machines with plastic cycloidal gears can work was determined. Thanks to the use of the finite element method one can point out the way of introduction of plastics in hydraulic machines construction.

Determination of the Load Carrying Capacity of Honeycomb Panels at Fixing Points under an External Load

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.299.1184 ◽

2020 ◽

Vol 299 ◽

pp. 1184-1189

Author(s):

V.V. Zhukov ◽

Anton V. Eremin ◽

D.V. Stepanec

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Finite Element Model ◽

Carrying Capacity ◽

External Load ◽

Element Model ◽

Load Carrying Capacity ◽

Load Carrying ◽

Honeycomb Panel

In this article, the object of study is a three–layer honeycomb panel with fixing elements (FE), which are used for transporting the panel, and fixing it to the spacecraft. The goal of the work is to determine experimentally the load carrying capacity of the fixing elements under various types of loading, to determine the load carrying capacity of the honeycomb panel of the spacecraft at fixing points and further comparison of the experimental results with the finite element method results calculated by MSC.Patran / Nastran. A method for conducting static tests of fixing elements of a spacecraft honeycomb panel under an external load is described, a description of computer technology of a finite–element solution to the problem of static strength of a honeycomb panel structure in the MSC.Patran environment is presented, and a finite–element model of a honeycomb panel is designed. An assessment of the strength of a three–layer structure at fixing points was carried out, followed by validation of the finite–element model of a honeycomb panel. On the basis of the validated model, the evaluation of the strength of the honeycomb structure was carried out; based on results obtained, the conclusion has been made about the convergence of the results by the finite element method with the results obtained during the experiment.

SEARCH FOR THE MOST USEFUL GEOMETRY OF AN ACOUSTIC JOURNAL BEARING

Tribologia ◽

10.5604/01.3001.0010.6122 ◽

2018 ◽

Vol 273 (3) ◽

pp. 15-66 ◽

Author(s):

Rafał GAWARKIEWICZ

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Computer Simulations ◽

Carrying Capacity ◽

Journal Bearing ◽

Squeeze Film ◽

Acoustic Levitation ◽

Load Carrying Capacity ◽

Load Carrying

Computer simulations of a number of journal bearing’s geometries utilising acoustic levitation were carried out. The choice of the best geometry depended on the ability of a deformed shape, created by piezo-electric elements, to facilitate squeeze film ultrasonic levitation, and also to create three evenly distributed diverging aerodynamic gaps. Deformations of analysed variants of the bearing’s shape were generated by numerical simulations utilising the finite element method. For the chosen shapes of geometry, prototype bearings were made and their usefulness verified experimentally. As a result, the bearing with the highest load carrying capacity was identified.

Single-angle compression members welded by one leg to a gusset plate. II. A parametric study and design equation

Canadian Journal of Civil Engineering ◽

10.1139/l97-118 ◽

1998 ◽

Vol 25 (3) ◽

pp. 585-594 ◽

Cited By ~ 5

Author(s):

Murray C Temple ◽

Sherief SS Sakla

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Carrying Capacity ◽

Load Carrying Capacity ◽

Design Equation ◽

Rigid Support ◽

Gusset Plate ◽

Compression Members ◽

Load Carrying

Single-angle compression members are complex members to analyze and design. The two generally accepted design procedures, the simple-column and the beam-column approaches, in general, underestimate the load-carrying capacity of single-angle compression members welded by one leg to a gusset plate fixed to a rigid support. One of the reasons is that these approaches do not properly account for the end constraint provided by the gusset plate. The effective length factor can be adjusted, but this is difficult to do as the end restraint is not easy to evaluate in many practical cases. Another reason is that these approaches are not based on a rational understanding of the failure mechanism of these members. An experimental program confirmed that the finite element method can be used, with a reasonable degree of accuracy, to predict the behavior and load-carrying capacity of single-angle compression members welded by one leg to a gusset plate fixed to a rigid support. The finite element method was used to study some 1800 different combinations of parameters. It was found that out-of-straightness, residual stresses in the angle section, Young's modulus of elasticity, and the unconnected gusset plate length do not have a great effect on the load-carrying capacity. The most significant parameter is the gusset plate thickness with the gusset plate width being the second most important parameter. An empirical design equation is proposed.Key words: angles, buckling, columns (structural), compressive resistance, design equation, gusset plates.

Analysis of Bolt Joint Using the Finite Element Method

Archive of Mechanical Engineering ◽

10.2478/v10180-010-0015-x ◽

2010 ◽

Vol 57 (3) ◽

pp. 275-292 ◽

Author(s):

Bartłomiej Żyliński ◽

Ryszard Buczkowski

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Nonlinear Stiffness ◽

Computational Results ◽

Working Pressure ◽

Joint Opening ◽

Stiffness Characteristics ◽

Isoparametric Finite Elements ◽

Analysis of Bolt Joint Using the Finite Element Method A numerical analysis of the initially clamped bolt joint subject to the working pressure is presented in the paper. Special, hexahedral 21- and 28-node isoparametric finite elements have been employed to model the contact zone. In this model, one takes into account loading due to the working pressure in the gap between the gasket and the flange arising as an effect of the progressing joint opening, what has not been considered in recent papers. Nonlinear stiffness characteristics of the bolt and the flange with the gasket are developed. Working pressure corresponding to the critical bolt force resulting in the joint leakage (complete opening between the gasket and the flange) is determined. FE computational results are compared with the available experimental results. The numerical results are presented using the authors' own graphical postprocessor.

The Assessment of the Technical Condition of Complex Fatigued Load-Carrying Structures

Applied Sciences ◽

10.3390/app11062449 ◽

2021 ◽

Vol 11 (6) ◽

pp. 2449

Author(s):

Robert Misiewicz ◽

Jędrzej Stanisław Więckowski

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Experimental Research ◽

Technical Condition ◽

Research Approach ◽

Research Techniques ◽

Main Emphasis ◽

Load Carrying ◽

This article presents a research approach that enables the assessment of the technical condition of complex technical objects. The main emphasis is placed on the load-carrying structures of these objects. The procedure applying experimental research techniques and computer computations using the finite element method is described. The combination of the two techniques assesses the technical condition of the structure. The described approach is presented using the example of two objects.

Transactions of the VŠB - Technical University of Ostrava Civil Engineering Series ◽

Experimental and Numerical Analysis of Steel Joints in Round Wood

10.2478/tvsb-2014-0027 ◽

2014 ◽

Vol 14 (2) ◽

pp. 1-10 ◽

Author(s):

David Mikolášek ◽

Antonín Lokaj ◽

Jiří Brožovský ◽

Oldřich Sucharda

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Numerical Analysis ◽

Carrying Capacity ◽

Load Carrying Capacity ◽

Geometrical Nonlinearities ◽

Round Wood ◽

Load Carrying ◽

Steel Joints

Abstract The paper analyses a drawn steel joint in round logs for which several types of reinforcements have been proposed. The load-carrying capacity of the reinforcements have been tested in laboratories. At the same time, numerical modelling has been performed - it has focused, in particular, on rigidity of the joints during the loading process. Physical and geometrical nonlinearities have been taken into account. The Finite Element Method and 3D computation models have been used in the numerical calculations.

Simulation of tuning graphene plasmonic behaviors by ferroelectric domains for self-driven infrared photodetector applications

Nanoscale ◽

10.1039/c9nr06508c ◽

2019 ◽

Vol 11 (43) ◽

pp. 20868-20875 ◽

Author(s):

Junxiong Guo ◽

Yu Liu ◽

Yuan Lin ◽

Yu Tian ◽

Jinxing Zhang ◽

...

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Interfacial Effect ◽

Infrared Photodetector ◽

Ferroelectric Domains ◽

We propose a graphene plasmonic infrared photodetector tuned by ferroelectric domains and investigate the interfacial effect using the finite element method.