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Zeitschriftendaten
Format
Zeitschrift
eISSN
2300-5319
Erstveröffentlichung
22 Jan 2014
Erscheinungsweise
4 Hefte pro Jahr
Sprachen
Englisch

Suche

Volumen 9 (2015): Heft 1 (March 2015)

Zeitschriftendaten
Format
Zeitschrift
eISSN
2300-5319
Erstveröffentlichung
22 Jan 2014
Erscheinungsweise
4 Hefte pro Jahr
Sprachen
Englisch

Suche

10 Artikel
access type Uneingeschränkter Zugang

Application of HPM to Find Analytical Solution of Coette Flow with Variable Viscosity

Online veröffentlicht: 15 May 2015
Seitenbereich: 5 - 8

Zusammenfassung

Abstract

In this paper, the couette flow of fluid with variable viscosity is studied analytically by using Homotopy Pertubation Method (HPM). At first the basic idea of Homotopy Pertubation Method (HPM) is presented. The mathematical formulation and application of HPM to nonlinear problem are presented in section three. In order to check the validity of solution the analytical results are compared with exact ones for various numerical cases. The good agreement between exact method and Homotopy Pertubation Method has been assures us about the solution accuracy.

Keywords

  • Analytical Solution
  • HPM
  • Coette Flow
  • Viscosity
access type Uneingeschränkter Zugang

The Influence of Clearances in a Drive System on Dynamics and Kinematics of a Telescopic Crane

Online veröffentlicht: 15 May 2015
Seitenbereich: 9 - 13

Zusammenfassung

Abstract

The paper presents the results of numerical analyses that were carried out in order to evaluate how a change in a size of a clearance in a slewing motion drive system of a telescopic crane influences the movement of a load and the dynamic loads of a structure. A computational model was developed based on a real structure of an experimental crane by using the ADAMS software. The analyses showed that a circumferential clearance at the output of a reduction gear, which is less than 1º, does not adversely affect the precision of the load movement. An excessive clearance leads to losing fluidity of a body slewing motion and to changes in the trajectory of the load.

Keywords

  • Clearances
  • Drive System
  • Experimental Telescopic Crane
  • Multibody Dynamic Systems
access type Uneingeschränkter Zugang

The Diesel and the Vegetable oil Properties Assessment in terms of Pumping Capability and Cooperation with Internal Combustion Engine Fuelling System

Online veröffentlicht: 15 May 2015
Seitenbereich: 14 - 18

Zusammenfassung

Abstract

In the paper, the results of preliminary diesel and vegetable oil research were shown, the subject of which were directly intended to be the fuel for powering compression ignition engines. In the times of climate protection and more strict standards concerning combustion gas emissions, the fuel production and transportation process became an important aspect. Decentralization of this process and enabling fuel obtaining directly from cultivation (oleaginous plants) let limit the global CO2 emission. This is why the preliminary assessment of two fuel sorts properties was attempted, on one side, the basic one, which is the diesel, on the other side - vegetable oil. Prior to subjecting the compression ignition engine to the process of adaptation to vegetable fuelling, the properties of the fuel responsible for pumping should be assessed (mainly viscosity) and friction nodes cooperation (lubricity). The first of researched parameters is the base to elaborating the system of engine controlling algorithm or the range of changes in construction of powering system. The second one is the wear issue - object fitness and repairing overhauls.

Keywords

  • Internal Combustion Engine
  • Alternative Fuels
  • Rheological Properties
access type Uneingeschränkter Zugang

Diagnostics of Gears and Compressors by Means of Advanced Automatic System

Online veröffentlicht: 15 May 2015
Seitenbereich: 19 - 22

Zusammenfassung

Abstract

In the present paper, the diagnostics problems of gears and air-compressors are discussed. The diagnostics has been performed by means of wireless system WiViD. This system is a unique design solution, in which several functions are divided and performer by two separate devices. The mentioned device functions are as follows: data handling, processing, their analysis and presentation. In the paper, own measurement procedures were created, checked and presented. The evaluation of technical conditions of some devices was done based upon the registered diagnostic symptoms, which were compared with the allowable limits.

Keywords

  • Gears
  • Air-Compressor
  • Diagnostic
access type Uneingeschränkter Zugang

The Search of Spatial Functions of Pressure in Adjustable Hydrostaticradial Bearing

Online veröffentlicht: 15 May 2015
Seitenbereich: 23 - 26

Zusammenfassung

Abstract

The analysis of spatial functions of pressure considering the geometrical deviations and the elastic deformation of conjugate surace have been considered. The analysis of spatial functions of pressure is performed by the finite element method. The difference of the size of pressure in a tangential direction of a pocket of a support under various service conditions has been investigated. A recommendation for improving of operational characteristics in regulated hydrostatic radial bearing has been developed.

Keywords

  • Hydrostatic Bearing
  • Lubricating Film
  • Spatial Functions
  • Hydromechanics
  • Reynold’s Equation
access type Uneingeschränkter Zugang

On The Convergence of Domain Decomposition Algorithm for The Body with Thin Inclusion

Online veröffentlicht: 15 May 2015
Seitenbereich: 27 - 32

Zusammenfassung

Abstract

We consider a coupled 3D model that involves computation of the stress-strain state for the body with thin inclusion. For the description of the stress-strain state of the main part, the linear elasticity theory is used. The inclusion is modelled using Timoshenko theory for shells. Therefore, the dimension of the problem inside the inclusion is decreased by one. For the numerical solution of this problem we propose an iterative domain decomposition algorithm (Dirichlet-Neumann scheme). This approach allows us to decouple problems in both parts and preserve the structure of the corresponding matrices. We investigate the convergence of the aforementioned algorithm and prove that the problem is well-posed.

Keywords

  • Elasticity Theory
  • Timoshenko Shell Theory
  • Steklov-Poincare Operator
  • Domain Decomposition
access type Uneingeschränkter Zugang

Solving Nonlinear Thermal Problems of Friction by Using Method of Lines

Online veröffentlicht: 15 May 2015
Seitenbereich: 33 - 37

Zusammenfassung

Abstract

One-dimensional heat conduction problem of friction for two bodies (half spaces) made of thermosensitive materials was considered. Solution to the nonlinear boundary-value heat conduction problem was obtained in three stages. At the first stage a partial linearization of the problem was performed by using Kirchhoff transform. Next, the obtained boundary-values problem by using the method of lines was brought to a system of nonlinear ordinary differential equations, relatively to Kirchhoff’s function values in the nodes of the grid on the spatial variable, where time is an independent variable. At the third stage, by using the Adams's method from DIFSUB package, a numerical solution was found to the above-mentioned differential equations. A comparative analysis was conducted (Och, 2014) using the results obtained with the proposed method and the method of successive approximations.

Keywords

  • Method Of Lines
  • Thermal Problems Of Friction
  • Thermosensitive Materials
access type Uneingeschränkter Zugang

Automatization of Contact Pressure Measurement between Trunk Orthosis and Patient's Body Using a Matrix Tactile Sensor

Online veröffentlicht: 15 May 2015
Seitenbereich: 38 - 43

Zusammenfassung

Abstract

Trunk orthosis affects trunk by a corrective-pressure mode with an objective to correct deformities (e.g. scoliosis). The effectiveness of this function depends on various factors, i.e. correct orthosis manufacture, correct application to patients and regular pressure corrective effect control. All these factors can be monitored by a system for measurement and evaluation of the contact pressure between the instrument and trunk in a real time and also by a so called “off line” system data recording. Presented article describes the application of made-to-measure sensor system TACTILUS (Sensor Products, USA) in different regimes (ambulance - A, home - H, combined - HA and multi-sensory ambulance - MA regime), testing of chosen static and dynamic matrix tactile sensor (MTS) parameters and results of the testing application between orthosis and patients' trunks.

Keywords

  • Matrix Tactile Sensor (MTS)
  • Contact Pressure
  • Trunk Orthosis
  • Scoliosis
access type Uneingeschränkter Zugang

The Structure of the Strength of Riveted Joints Determined in the Lap Joint Tensile Shear Test

Online veröffentlicht: 15 May 2015
Seitenbereich: 44 - 49

Zusammenfassung

Abstract

The article presents the analysis of the structure of the load capacity of riveted joints. For the four joining systems the lap joint specimens were made and tested in the shearing test. The joints were prepared for the three combinations of the DC01 steel and EN AW- 5754 aluminium alloy sheets with the thickness of 2mm. On the basis of the obtained load-elongation diagram tensile shear test curves, the basic parameters defined in the ISO/DIS 12996 standard were determined. In the case of the conventional riveted joints the maximum load capacity of the joint is determined by the strength of the fastener. For the joints with aluminium-steel blind rivet , the load capacity of the joint was on the strength limit of the rivet tubular part and on the strength limit of the sheet material. The strength of the SSPR joint is determined by the mechanical properties of the material of the joined sheets. From all sheets and rivet specimens arrangements the highest load capacity of the joint was obtained for the DC01 sheet material joints, and the lowest load capacity of the joint was obtained for the EN AW-5754 sheet material joints.

Keywords

  • Riveted Joints
  • Mechanical Joining
  • Sheets Joining
  • Shearing Test
  • Joint Strength
access type Uneingeschränkter Zugang

Computationaly Simple Obstacle Avoidance Control Law for Small Unmanned Aerial Vehicles

Online veröffentlicht: 15 May 2015
Seitenbereich: 50 - 56

Zusammenfassung

Abstract

The investigations of the system which allow to avoid obstacles by the unmanned aerial vehicles (UAV) are presented in the paper. The system is designed to enable the full autonomous UAV flight in an unknown environment. As an information source about obstacles digital camera was used. Developed algorithm uses the existing relations between the imaging system and the parameters read from the UAV autopilot. Synthesis of the proposed obstacle avoidance control law was oriented for computational simplicity. Presented algorithm was checked during simulation studies and in-flight tests.

Keywords

  • Unmanned Aerial Vehicle
  • Quadrotor Control
  • Obstacle Avoidance
  • Vision Systems
10 Artikel
access type Uneingeschränkter Zugang

Application of HPM to Find Analytical Solution of Coette Flow with Variable Viscosity

Online veröffentlicht: 15 May 2015
Seitenbereich: 5 - 8

Zusammenfassung

Abstract

In this paper, the couette flow of fluid with variable viscosity is studied analytically by using Homotopy Pertubation Method (HPM). At first the basic idea of Homotopy Pertubation Method (HPM) is presented. The mathematical formulation and application of HPM to nonlinear problem are presented in section three. In order to check the validity of solution the analytical results are compared with exact ones for various numerical cases. The good agreement between exact method and Homotopy Pertubation Method has been assures us about the solution accuracy.

Keywords

  • Analytical Solution
  • HPM
  • Coette Flow
  • Viscosity
access type Uneingeschränkter Zugang

The Influence of Clearances in a Drive System on Dynamics and Kinematics of a Telescopic Crane

Online veröffentlicht: 15 May 2015
Seitenbereich: 9 - 13

Zusammenfassung

Abstract

The paper presents the results of numerical analyses that were carried out in order to evaluate how a change in a size of a clearance in a slewing motion drive system of a telescopic crane influences the movement of a load and the dynamic loads of a structure. A computational model was developed based on a real structure of an experimental crane by using the ADAMS software. The analyses showed that a circumferential clearance at the output of a reduction gear, which is less than 1º, does not adversely affect the precision of the load movement. An excessive clearance leads to losing fluidity of a body slewing motion and to changes in the trajectory of the load.

Keywords

  • Clearances
  • Drive System
  • Experimental Telescopic Crane
  • Multibody Dynamic Systems
access type Uneingeschränkter Zugang

The Diesel and the Vegetable oil Properties Assessment in terms of Pumping Capability and Cooperation with Internal Combustion Engine Fuelling System

Online veröffentlicht: 15 May 2015
Seitenbereich: 14 - 18

Zusammenfassung

Abstract

In the paper, the results of preliminary diesel and vegetable oil research were shown, the subject of which were directly intended to be the fuel for powering compression ignition engines. In the times of climate protection and more strict standards concerning combustion gas emissions, the fuel production and transportation process became an important aspect. Decentralization of this process and enabling fuel obtaining directly from cultivation (oleaginous plants) let limit the global CO2 emission. This is why the preliminary assessment of two fuel sorts properties was attempted, on one side, the basic one, which is the diesel, on the other side - vegetable oil. Prior to subjecting the compression ignition engine to the process of adaptation to vegetable fuelling, the properties of the fuel responsible for pumping should be assessed (mainly viscosity) and friction nodes cooperation (lubricity). The first of researched parameters is the base to elaborating the system of engine controlling algorithm or the range of changes in construction of powering system. The second one is the wear issue - object fitness and repairing overhauls.

Keywords

  • Internal Combustion Engine
  • Alternative Fuels
  • Rheological Properties
access type Uneingeschränkter Zugang

Diagnostics of Gears and Compressors by Means of Advanced Automatic System

Online veröffentlicht: 15 May 2015
Seitenbereich: 19 - 22

Zusammenfassung

Abstract

In the present paper, the diagnostics problems of gears and air-compressors are discussed. The diagnostics has been performed by means of wireless system WiViD. This system is a unique design solution, in which several functions are divided and performer by two separate devices. The mentioned device functions are as follows: data handling, processing, their analysis and presentation. In the paper, own measurement procedures were created, checked and presented. The evaluation of technical conditions of some devices was done based upon the registered diagnostic symptoms, which were compared with the allowable limits.

Keywords

  • Gears
  • Air-Compressor
  • Diagnostic
access type Uneingeschränkter Zugang

The Search of Spatial Functions of Pressure in Adjustable Hydrostaticradial Bearing

Online veröffentlicht: 15 May 2015
Seitenbereich: 23 - 26

Zusammenfassung

Abstract

The analysis of spatial functions of pressure considering the geometrical deviations and the elastic deformation of conjugate surace have been considered. The analysis of spatial functions of pressure is performed by the finite element method. The difference of the size of pressure in a tangential direction of a pocket of a support under various service conditions has been investigated. A recommendation for improving of operational characteristics in regulated hydrostatic radial bearing has been developed.

Keywords

  • Hydrostatic Bearing
  • Lubricating Film
  • Spatial Functions
  • Hydromechanics
  • Reynold’s Equation
access type Uneingeschränkter Zugang

On The Convergence of Domain Decomposition Algorithm for The Body with Thin Inclusion

Online veröffentlicht: 15 May 2015
Seitenbereich: 27 - 32

Zusammenfassung

Abstract

We consider a coupled 3D model that involves computation of the stress-strain state for the body with thin inclusion. For the description of the stress-strain state of the main part, the linear elasticity theory is used. The inclusion is modelled using Timoshenko theory for shells. Therefore, the dimension of the problem inside the inclusion is decreased by one. For the numerical solution of this problem we propose an iterative domain decomposition algorithm (Dirichlet-Neumann scheme). This approach allows us to decouple problems in both parts and preserve the structure of the corresponding matrices. We investigate the convergence of the aforementioned algorithm and prove that the problem is well-posed.

Keywords

  • Elasticity Theory
  • Timoshenko Shell Theory
  • Steklov-Poincare Operator
  • Domain Decomposition
access type Uneingeschränkter Zugang

Solving Nonlinear Thermal Problems of Friction by Using Method of Lines

Online veröffentlicht: 15 May 2015
Seitenbereich: 33 - 37

Zusammenfassung

Abstract

One-dimensional heat conduction problem of friction for two bodies (half spaces) made of thermosensitive materials was considered. Solution to the nonlinear boundary-value heat conduction problem was obtained in three stages. At the first stage a partial linearization of the problem was performed by using Kirchhoff transform. Next, the obtained boundary-values problem by using the method of lines was brought to a system of nonlinear ordinary differential equations, relatively to Kirchhoff’s function values in the nodes of the grid on the spatial variable, where time is an independent variable. At the third stage, by using the Adams's method from DIFSUB package, a numerical solution was found to the above-mentioned differential equations. A comparative analysis was conducted (Och, 2014) using the results obtained with the proposed method and the method of successive approximations.

Keywords

  • Method Of Lines
  • Thermal Problems Of Friction
  • Thermosensitive Materials
access type Uneingeschränkter Zugang

Automatization of Contact Pressure Measurement between Trunk Orthosis and Patient's Body Using a Matrix Tactile Sensor

Online veröffentlicht: 15 May 2015
Seitenbereich: 38 - 43

Zusammenfassung

Abstract

Trunk orthosis affects trunk by a corrective-pressure mode with an objective to correct deformities (e.g. scoliosis). The effectiveness of this function depends on various factors, i.e. correct orthosis manufacture, correct application to patients and regular pressure corrective effect control. All these factors can be monitored by a system for measurement and evaluation of the contact pressure between the instrument and trunk in a real time and also by a so called “off line” system data recording. Presented article describes the application of made-to-measure sensor system TACTILUS (Sensor Products, USA) in different regimes (ambulance - A, home - H, combined - HA and multi-sensory ambulance - MA regime), testing of chosen static and dynamic matrix tactile sensor (MTS) parameters and results of the testing application between orthosis and patients' trunks.

Keywords

  • Matrix Tactile Sensor (MTS)
  • Contact Pressure
  • Trunk Orthosis
  • Scoliosis
access type Uneingeschränkter Zugang

The Structure of the Strength of Riveted Joints Determined in the Lap Joint Tensile Shear Test

Online veröffentlicht: 15 May 2015
Seitenbereich: 44 - 49

Zusammenfassung

Abstract

The article presents the analysis of the structure of the load capacity of riveted joints. For the four joining systems the lap joint specimens were made and tested in the shearing test. The joints were prepared for the three combinations of the DC01 steel and EN AW- 5754 aluminium alloy sheets with the thickness of 2mm. On the basis of the obtained load-elongation diagram tensile shear test curves, the basic parameters defined in the ISO/DIS 12996 standard were determined. In the case of the conventional riveted joints the maximum load capacity of the joint is determined by the strength of the fastener. For the joints with aluminium-steel blind rivet , the load capacity of the joint was on the strength limit of the rivet tubular part and on the strength limit of the sheet material. The strength of the SSPR joint is determined by the mechanical properties of the material of the joined sheets. From all sheets and rivet specimens arrangements the highest load capacity of the joint was obtained for the DC01 sheet material joints, and the lowest load capacity of the joint was obtained for the EN AW-5754 sheet material joints.

Keywords

  • Riveted Joints
  • Mechanical Joining
  • Sheets Joining
  • Shearing Test
  • Joint Strength
access type Uneingeschränkter Zugang

Computationaly Simple Obstacle Avoidance Control Law for Small Unmanned Aerial Vehicles

Online veröffentlicht: 15 May 2015
Seitenbereich: 50 - 56

Zusammenfassung

Abstract

The investigations of the system which allow to avoid obstacles by the unmanned aerial vehicles (UAV) are presented in the paper. The system is designed to enable the full autonomous UAV flight in an unknown environment. As an information source about obstacles digital camera was used. Developed algorithm uses the existing relations between the imaging system and the parameters read from the UAV autopilot. Synthesis of the proposed obstacle avoidance control law was oriented for computational simplicity. Presented algorithm was checked during simulation studies and in-flight tests.

Keywords

  • Unmanned Aerial Vehicle
  • Quadrotor Control
  • Obstacle Avoidance
  • Vision Systems

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