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Informacje o czasopiśmie
Format
Czasopismo
eISSN
2300-5319
Pierwsze wydanie
22 Jan 2014
Częstotliwość wydawania
4 razy w roku
Języki
Angielski

Wyszukiwanie

Tom 9 (2015): Zeszyt 4 (December 2015)

Informacje o czasopiśmie
Format
Czasopismo
eISSN
2300-5319
Pierwsze wydanie
22 Jan 2014
Częstotliwość wydawania
4 razy w roku
Języki
Angielski

Wyszukiwanie

12 Artykułów
access type Otwarty dostęp

The Experimental Investigation Of The Screen Operation In The Parametric Resonance Conditions

Data publikacji: 30 Dec 2015
Zakres stron: 191 - 194

Abstrakt

Abstract

In this paper the experimental studies of the screen working in the parametric resonance condition are discussed. The investigations are conducted for laboratory parametric resonance screen. The measuring test is performed for four cases of tension force values. The full sheet metal instead of the sieve is used. For each considered case the natural frequency of the plate and the parameter modulation frequency are determined. The achieved results are presented and discussed. It is shown that the highest sieve plate amplitude is obtained when the parameter modulation frequency is two times larger than natural frequency of the sieve plate. This parametric resonance vibration was observed only for tension force equal to 4000 N because of the rotational speed limits of electrical vibratos.

Słowa kluczowe

  • Vibrating Screen
  • Parametric Resonance
  • Natural Frequencies
access type Otwarty dostęp

Fluidic Generator Of Microbubbles – Oscillator With Gas Flow Reversal For A Part Of Period

Data publikacji: 30 Dec 2015
Zakres stron: 195 - 203

Abstrakt

Abstract

Paper presents a fluidic device developed for generation of small (less than 1 mm in diameter) microbubbles in a liquid from gas passing gas through small passages. Until now the bubbles are larger than the size of aerator passage exits so that making the passages smaller did not result in obtaining the desirable microbubbles. Analysis of high-speed camera images (obtained with a special lens of large working distance) have shown show that the large bubble size is caused by slow ascent motion of very small bubbles so that they get into mutual contact and grow by conjunction. The solution is to pulsate the supplied gas flow by a no-moving-part fluidic oscillator. The generated small bubble is moved back into the aerator passage where it is for a part of oscillation period protected from the conjunction with other, previously generated microbubbles.

Słowa kluczowe

  • Fluidics
  • Oscillators
  • Microbubbles
  • U-Tube Resonator
access type Otwarty dostęp

Modeling And Parameter Identification Of Vibrations Of A Double Torsion Pendulum With Friction

Data publikacji: 30 Dec 2015
Zakres stron: 204 - 212

Abstrakt

Abstract

The purpose of this paper is to investigate a double torsion pendulum with planar frictional contact. The single torsion pendulum with one-degree-of-freedom is an angular equivalent of the linear harmonic oscillator. The second degree of freedom has been obtained by adding a free body to the inverted single torsion pendulum. The free body’s angular displacement is caused by frictional forces appearing in the interface (contact zone) between the free body and the pendulum column’s head kinematically excited at its base by a mechanism with torsion spiral spring. An experimental station has been set up and run to find most unknown parameters of the pendulum from the time series of state variables taken as inputs to the Nelder-Mead method of identification. The obtained results proved significant usability of the identification method in the case of numerical simulation of the pendulum’s dynamical model. It has not been satisfactorily proved in the case of time characteristics coming from a real system that exhibits also some unrecognized physical effects.

Słowa kluczowe

  • Friction
  • Planar Contact
  • Numerical Modeling
  • Double Torsion Pendulum
  • Parameter Identification
  • Nonlinear Vibrations
  • Kinematic Excitation
  • Kinematic Forcing Mechanism
  • Nelder-Mead Method
access type Otwarty dostęp

A Concept Of Modification And Simulation Studies Of A Mechatronic Stair Transporter For The Disabled

Data publikacji: 30 Dec 2015
Zakres stron: 213 - 218

Abstrakt

Abstract

A numerical model of existing stair climber with its passenger was built and its operation was analysed through simulations. A modification of the stair climber has been developed on a basis of the simulation studies. The modification depends on equipping the device with additional controllable mechanism the function of which is to change the position of the passenger’s centre of gravity. Comparative simulation studies were carried out for the standard version and the modified version of the stair transporter in a system for the dynamic.

Słowa kluczowe

  • Computational Model
  • Stair Transporter
  • Operator Relief System
access type Otwarty dostęp

Cyclic Linear Random Process As A Mathematical Model Of Cyclic Signals

Data publikacji: 30 Dec 2015
Zakres stron: 219 - 224

Abstrakt

Abstract

In this study the cyclic linear random process is defined, that combines the properties of linear random process and cyclic random process. This expands the possibility describing cyclic signals and processes within the framework of linear random processes theory and generalizes their known mathematical model as a linear periodic random process. The conditions for the kernel are given and the probabilistic characteristics of generated process of linear random process in order to be a cyclic random process. The advantages of the cyclic linear random process are presented. It can be used as the mathematical model of the cyclic stochastic signals and processes in various fields of science and technology.

Słowa kluczowe

  • Linear Cyclic Random Process
  • Mathematical Model
  • Rhythm Function
  • Factorized Kernel
access type Otwarty dostęp

Minimum Energy Control Of Positive Time-Varying Linear Systems

Data publikacji: 30 Dec 2015
Zakres stron: 225 - 228

Abstrakt

Abstract

The minimum energy control problem for the positive time-varying linear systems is formulated and solved. Sufficient conditions for the existence of solution to the problem are established. A procedure for solving of the problem is proposed and illustrated by a numerical example.

Słowa kluczowe

  • Positive
  • Continuous-Time
  • Minimum Energy Control
  • Procedure
access type Otwarty dostęp

Comparative Analysis For Kinematics Of 5-DOF Industrial Robotic Manipulator

Data publikacji: 30 Dec 2015
Zakres stron: 229 - 240

Abstrakt

Abstract

This paper gives the kinematic analysis of a 5-DOF industrial robotic manipulator while considering wrist in motion. Analytical solutions have been obtained for forward kinematics and inverse kinematics to accurately position the end-effector of robotic manipulator in three dimensional spaces. For the first time, a hybrid neuro-fuzzy intelligent technique with two different membership functions has been studied and their performances are comparatively evaluated with analytical solutions. An experiment has been performed for a desired trajectory. It is seen that the results for the intelligent technique are reasonably in agreement with experiment. Also, the results obtained highlight the importance of selection of a particular membership function for robotic manipulators of industrial use.

Słowa kluczowe

  • Kinematic Analysis
  • Wrist
  • ANFIS
  • Membership Function
  • Degree of Freedom
access type Otwarty dostęp

Stress-Strain State Of Elastic Plate With An Arbitrary Smooth Notch

Data publikacji: 30 Dec 2015
Zakres stron: 241 - 244

Abstrakt

Abstract

The paper contains comparing calculations of the stress fields in an elastic plate with notch along the arc of a circle, ellipse or parabola obtained by analytic method based on complex Kolosov-Muskhelishvili potentials and by numerical variation-difference method. These fields differ by no more than 2%, which, in particular, indicates the reliability of such numerical implementation. This discrepancy can be explained by the fact that in the analytical solution domain is unbounded, while the numerical calculation was carried out, obviously, for a finite field. The given stresses at the top of the notch along the arc of an ellipse or a parabola significantly increase with increasing of the relative depth of the notch (while increasing its depth or decreasing width).

Słowa kluczowe

  • Semi-Plane
  • Plate
  • Notch
  • Variation-Difference Method
  • Stress Field
access type Otwarty dostęp

Koiter Asymptotic Analysis Of Thin-Walled Cold-Formed Steel Members

Data publikacji: 30 Dec 2015
Zakres stron: 245 - 251

Abstrakt

Abstract

An imperfection sensitivity analysis of cold-formed steel members in compression is presented. The analysis is based on Koiter’s approach and Monte Carlo simulation. If the modes interaction is correctly accounted, than the limit load and the erosion of critical buckling load can be easily evaluated. Thousands of imperfection can be analysed with very low computational cost and an effective statistical evaluation of limit performance can be carried out. The analysis is done on pallet rack uprights in compression, based on an intensive experimental study carried out at the Politehnica University of Timisoara.

Słowa kluczowe

  • Koiter Asymptotic Approach
  • Instability Problems
  • Thin-Walled Cold-Formed Steel Members
  • Imperfection Sensitivity Analysis
  • Monte Carlo
access type Otwarty dostęp

Robust Output Regulation Of Uncertain Chaotic Systems With Input Magnitude And Rate Constraints

Data publikacji: 30 Dec 2015
Zakres stron: 252 - 258

Abstrakt

Abstract

The problem of output regulation deserves a special attention particularly when it comes to the regulation of nonlinear systems. It is well-known that the problem is not always solvable even for linear systems and the fact that some demanding applications require not only magnitude but also rate actuator constraints makes the problem even more challenging. In addition, real physical systems might have parameters whose values can be known only with a specified accuracy and these uncertainties must also be considered to ensure robustness and on the other hand because they can be crucial for the type of behaviour exhibited by the system as it happens with the celebrated chaotic systems. The present paper proposes a robust control method for output regulation of chaotic systems with parameter uncertainties and subjected to magnitude and rate actuator constraints. The method is an extension of a work recently addressed by the same authors and consists in decomposing the nonlinear system into a stabilizable linear part plus a nonlinear part and in finding a control law based on the small-gain principle. Numerical simulations are performed to validate the effectiveness and robustness of the method using an aeronautical application. The output regulation is successfully achieved without exceeding the input constraints and stability is assured when the parameters are within the specified intervals. Furthermore, the proposed method does not require much computational effort because all the control parameters are computed offline.

Słowa kluczowe

  • Output Regulation
  • Actuator Constraints
  • Parametric Uncertainties
  • Robust Control
  • Chaos
  • Aeroelastic System
access type Otwarty dostęp

Local Damages During Rolling And Mechano-Rolling Fatigue For The Mechanical System Shaft – Roller (0.45 Carbon Steel – 25XGT Steel, 20XH3A Steel – 20XH3A Steel)

Data publikacji: 30 Dec 2015
Zakres stron: 259 - 264

Abstrakt

Abstract

The report provides a description of local damages which are formed in the process of wear-fatigue tests. The analysis of local surface wave-like damages during rolling and mechano-rolling fatigue for the shaft-roller mechanical system under steady-state and multi-stage loading conditions is given. It is shown that the study of local wear-fatigue damage was made possible by new methods of testing and measuring wear-fatigue tests and damages, which are described in the report. New characteristics to estimate the parameters of the local wear-fatigue damage are proposed. The concept of local fatigue curves is introduced. The laws of local wear-fatigue damage for the shaft - roller system are analysed.

Słowa kluczowe

  • Local Damage
  • Fatigue
  • Tribo-Fatigue System
  • Microcrack
  • Wear-Fatigue Damage
  • Residual Deformation
  • Wave-Like Damage
  • Troppy Phenomena
  • Local Fatigue Curve
access type Otwarty dostęp

Real Time Trajectory Correction System Of Optical Head In Laser Welding

Data publikacji: 30 Dec 2015
Zakres stron: 265 - 269

Abstrakt

Abstract

Application of laser welding technology requires that the laser beam is guided through the whole length of the joint with sufficiently high accuracy. This paper describes result of research on development of optomechatronic system that allows for the precise positioning of the laser head’s TCP point on the edge of welded elements during laser processing. The developed system allows for compensation of workpiece’s fixture inaccuracies, precast distortions and workpiece deformations occurring during the process.

Słowa kluczowe

  • Control System
  • Machine Vision
  • Image Processing
  • Laser Welding
12 Artykułów
access type Otwarty dostęp

The Experimental Investigation Of The Screen Operation In The Parametric Resonance Conditions

Data publikacji: 30 Dec 2015
Zakres stron: 191 - 194

Abstrakt

Abstract

In this paper the experimental studies of the screen working in the parametric resonance condition are discussed. The investigations are conducted for laboratory parametric resonance screen. The measuring test is performed for four cases of tension force values. The full sheet metal instead of the sieve is used. For each considered case the natural frequency of the plate and the parameter modulation frequency are determined. The achieved results are presented and discussed. It is shown that the highest sieve plate amplitude is obtained when the parameter modulation frequency is two times larger than natural frequency of the sieve plate. This parametric resonance vibration was observed only for tension force equal to 4000 N because of the rotational speed limits of electrical vibratos.

Słowa kluczowe

  • Vibrating Screen
  • Parametric Resonance
  • Natural Frequencies
access type Otwarty dostęp

Fluidic Generator Of Microbubbles – Oscillator With Gas Flow Reversal For A Part Of Period

Data publikacji: 30 Dec 2015
Zakres stron: 195 - 203

Abstrakt

Abstract

Paper presents a fluidic device developed for generation of small (less than 1 mm in diameter) microbubbles in a liquid from gas passing gas through small passages. Until now the bubbles are larger than the size of aerator passage exits so that making the passages smaller did not result in obtaining the desirable microbubbles. Analysis of high-speed camera images (obtained with a special lens of large working distance) have shown show that the large bubble size is caused by slow ascent motion of very small bubbles so that they get into mutual contact and grow by conjunction. The solution is to pulsate the supplied gas flow by a no-moving-part fluidic oscillator. The generated small bubble is moved back into the aerator passage where it is for a part of oscillation period protected from the conjunction with other, previously generated microbubbles.

Słowa kluczowe

  • Fluidics
  • Oscillators
  • Microbubbles
  • U-Tube Resonator
access type Otwarty dostęp

Modeling And Parameter Identification Of Vibrations Of A Double Torsion Pendulum With Friction

Data publikacji: 30 Dec 2015
Zakres stron: 204 - 212

Abstrakt

Abstract

The purpose of this paper is to investigate a double torsion pendulum with planar frictional contact. The single torsion pendulum with one-degree-of-freedom is an angular equivalent of the linear harmonic oscillator. The second degree of freedom has been obtained by adding a free body to the inverted single torsion pendulum. The free body’s angular displacement is caused by frictional forces appearing in the interface (contact zone) between the free body and the pendulum column’s head kinematically excited at its base by a mechanism with torsion spiral spring. An experimental station has been set up and run to find most unknown parameters of the pendulum from the time series of state variables taken as inputs to the Nelder-Mead method of identification. The obtained results proved significant usability of the identification method in the case of numerical simulation of the pendulum’s dynamical model. It has not been satisfactorily proved in the case of time characteristics coming from a real system that exhibits also some unrecognized physical effects.

Słowa kluczowe

  • Friction
  • Planar Contact
  • Numerical Modeling
  • Double Torsion Pendulum
  • Parameter Identification
  • Nonlinear Vibrations
  • Kinematic Excitation
  • Kinematic Forcing Mechanism
  • Nelder-Mead Method
access type Otwarty dostęp

A Concept Of Modification And Simulation Studies Of A Mechatronic Stair Transporter For The Disabled

Data publikacji: 30 Dec 2015
Zakres stron: 213 - 218

Abstrakt

Abstract

A numerical model of existing stair climber with its passenger was built and its operation was analysed through simulations. A modification of the stair climber has been developed on a basis of the simulation studies. The modification depends on equipping the device with additional controllable mechanism the function of which is to change the position of the passenger’s centre of gravity. Comparative simulation studies were carried out for the standard version and the modified version of the stair transporter in a system for the dynamic.

Słowa kluczowe

  • Computational Model
  • Stair Transporter
  • Operator Relief System
access type Otwarty dostęp

Cyclic Linear Random Process As A Mathematical Model Of Cyclic Signals

Data publikacji: 30 Dec 2015
Zakres stron: 219 - 224

Abstrakt

Abstract

In this study the cyclic linear random process is defined, that combines the properties of linear random process and cyclic random process. This expands the possibility describing cyclic signals and processes within the framework of linear random processes theory and generalizes their known mathematical model as a linear periodic random process. The conditions for the kernel are given and the probabilistic characteristics of generated process of linear random process in order to be a cyclic random process. The advantages of the cyclic linear random process are presented. It can be used as the mathematical model of the cyclic stochastic signals and processes in various fields of science and technology.

Słowa kluczowe

  • Linear Cyclic Random Process
  • Mathematical Model
  • Rhythm Function
  • Factorized Kernel
access type Otwarty dostęp

Minimum Energy Control Of Positive Time-Varying Linear Systems

Data publikacji: 30 Dec 2015
Zakres stron: 225 - 228

Abstrakt

Abstract

The minimum energy control problem for the positive time-varying linear systems is formulated and solved. Sufficient conditions for the existence of solution to the problem are established. A procedure for solving of the problem is proposed and illustrated by a numerical example.

Słowa kluczowe

  • Positive
  • Continuous-Time
  • Minimum Energy Control
  • Procedure
access type Otwarty dostęp

Comparative Analysis For Kinematics Of 5-DOF Industrial Robotic Manipulator

Data publikacji: 30 Dec 2015
Zakres stron: 229 - 240

Abstrakt

Abstract

This paper gives the kinematic analysis of a 5-DOF industrial robotic manipulator while considering wrist in motion. Analytical solutions have been obtained for forward kinematics and inverse kinematics to accurately position the end-effector of robotic manipulator in three dimensional spaces. For the first time, a hybrid neuro-fuzzy intelligent technique with two different membership functions has been studied and their performances are comparatively evaluated with analytical solutions. An experiment has been performed for a desired trajectory. It is seen that the results for the intelligent technique are reasonably in agreement with experiment. Also, the results obtained highlight the importance of selection of a particular membership function for robotic manipulators of industrial use.

Słowa kluczowe

  • Kinematic Analysis
  • Wrist
  • ANFIS
  • Membership Function
  • Degree of Freedom
access type Otwarty dostęp

Stress-Strain State Of Elastic Plate With An Arbitrary Smooth Notch

Data publikacji: 30 Dec 2015
Zakres stron: 241 - 244

Abstrakt

Abstract

The paper contains comparing calculations of the stress fields in an elastic plate with notch along the arc of a circle, ellipse or parabola obtained by analytic method based on complex Kolosov-Muskhelishvili potentials and by numerical variation-difference method. These fields differ by no more than 2%, which, in particular, indicates the reliability of such numerical implementation. This discrepancy can be explained by the fact that in the analytical solution domain is unbounded, while the numerical calculation was carried out, obviously, for a finite field. The given stresses at the top of the notch along the arc of an ellipse or a parabola significantly increase with increasing of the relative depth of the notch (while increasing its depth or decreasing width).

Słowa kluczowe

  • Semi-Plane
  • Plate
  • Notch
  • Variation-Difference Method
  • Stress Field
access type Otwarty dostęp

Koiter Asymptotic Analysis Of Thin-Walled Cold-Formed Steel Members

Data publikacji: 30 Dec 2015
Zakres stron: 245 - 251

Abstrakt

Abstract

An imperfection sensitivity analysis of cold-formed steel members in compression is presented. The analysis is based on Koiter’s approach and Monte Carlo simulation. If the modes interaction is correctly accounted, than the limit load and the erosion of critical buckling load can be easily evaluated. Thousands of imperfection can be analysed with very low computational cost and an effective statistical evaluation of limit performance can be carried out. The analysis is done on pallet rack uprights in compression, based on an intensive experimental study carried out at the Politehnica University of Timisoara.

Słowa kluczowe

  • Koiter Asymptotic Approach
  • Instability Problems
  • Thin-Walled Cold-Formed Steel Members
  • Imperfection Sensitivity Analysis
  • Monte Carlo
access type Otwarty dostęp

Robust Output Regulation Of Uncertain Chaotic Systems With Input Magnitude And Rate Constraints

Data publikacji: 30 Dec 2015
Zakres stron: 252 - 258

Abstrakt

Abstract

The problem of output regulation deserves a special attention particularly when it comes to the regulation of nonlinear systems. It is well-known that the problem is not always solvable even for linear systems and the fact that some demanding applications require not only magnitude but also rate actuator constraints makes the problem even more challenging. In addition, real physical systems might have parameters whose values can be known only with a specified accuracy and these uncertainties must also be considered to ensure robustness and on the other hand because they can be crucial for the type of behaviour exhibited by the system as it happens with the celebrated chaotic systems. The present paper proposes a robust control method for output regulation of chaotic systems with parameter uncertainties and subjected to magnitude and rate actuator constraints. The method is an extension of a work recently addressed by the same authors and consists in decomposing the nonlinear system into a stabilizable linear part plus a nonlinear part and in finding a control law based on the small-gain principle. Numerical simulations are performed to validate the effectiveness and robustness of the method using an aeronautical application. The output regulation is successfully achieved without exceeding the input constraints and stability is assured when the parameters are within the specified intervals. Furthermore, the proposed method does not require much computational effort because all the control parameters are computed offline.

Słowa kluczowe

  • Output Regulation
  • Actuator Constraints
  • Parametric Uncertainties
  • Robust Control
  • Chaos
  • Aeroelastic System
access type Otwarty dostęp

Local Damages During Rolling And Mechano-Rolling Fatigue For The Mechanical System Shaft – Roller (0.45 Carbon Steel – 25XGT Steel, 20XH3A Steel – 20XH3A Steel)

Data publikacji: 30 Dec 2015
Zakres stron: 259 - 264

Abstrakt

Abstract

The report provides a description of local damages which are formed in the process of wear-fatigue tests. The analysis of local surface wave-like damages during rolling and mechano-rolling fatigue for the shaft-roller mechanical system under steady-state and multi-stage loading conditions is given. It is shown that the study of local wear-fatigue damage was made possible by new methods of testing and measuring wear-fatigue tests and damages, which are described in the report. New characteristics to estimate the parameters of the local wear-fatigue damage are proposed. The concept of local fatigue curves is introduced. The laws of local wear-fatigue damage for the shaft - roller system are analysed.

Słowa kluczowe

  • Local Damage
  • Fatigue
  • Tribo-Fatigue System
  • Microcrack
  • Wear-Fatigue Damage
  • Residual Deformation
  • Wave-Like Damage
  • Troppy Phenomena
  • Local Fatigue Curve
access type Otwarty dostęp

Real Time Trajectory Correction System Of Optical Head In Laser Welding

Data publikacji: 30 Dec 2015
Zakres stron: 265 - 269

Abstrakt

Abstract

Application of laser welding technology requires that the laser beam is guided through the whole length of the joint with sufficiently high accuracy. This paper describes result of research on development of optomechatronic system that allows for the precise positioning of the laser head’s TCP point on the edge of welded elements during laser processing. The developed system allows for compensation of workpiece’s fixture inaccuracies, precast distortions and workpiece deformations occurring during the process.

Słowa kluczowe

  • Control System
  • Machine Vision
  • Image Processing
  • Laser Welding

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