|
Journal PROCEEDINGS IN MANUFACTURING SYSTEMS |
|
ISSN 2343–7472 ISSN-L 2067-9238 |
|
|
|
|
Journal PROCEEDINGS IN MANUFACTURING SYSTEMS
□ Volume 11, Issue 4, 2016
·....... Vidosav D. MAJSTOROVIĆ, Srdjan P. ŽIVKOVIĆ, ......... Airfoil geometric inspection optimization for contact measuring probes
·....... Georgi TODOROV, Konstantin KAMBEROV, Mario semkov, Nikolay NIKOLOV, ......... Concept and design of kinetic energy recuperation system
·....... Dragos
AROTĂRIȚEI, Cristian ROTARIU, Alexandru PĂSĂRICĂ, ......... Complexity measure for RR intervals, descriptor for arrythmia classification
·....... Raul TURMANIDZE, Erekle TSIKARISHVILI, Giorgi
POPKHADZE, New designs of rotors with variable
geometry parameters in dynamics and their
effective use in aviation and wind energy
·....... Aurelian ZAPCIU, George CONSTANTIN
·....... Adrian
Florin NICOLESCU, Andrei Mario IVAN, Cezara Georgia COMAN, ......... Analysis of machining forces in light-force robotic milling of aluminium parts
·....... Andrei
GHEORGHIȚĂ, Dragoș AROTĂRIȚEI, Marius TURNEA, George
CONSTANTIN,
·....... Claudiu
BÎŞU, George CONSTANTIN, Dorel ANANIA, Miron ZAPCIU ......... Dynamic behavior study used in retrofitting of a lathe for re-profiling railway wheelset
Vidosav D. MAJSTOROVIĆ1,
Srdjan P. ŽIVKOVIĆ2,* 1) Prof. Dr., Mechanical Engineering Faculty, Laboratory for Production
Metrology and TQM, Belgrade, Serbia 2) Dr., Head of Section, Military Technical Institute, Coordinate
Metrology Lab, Belgrade, Serbia Abstract: This paper presents
optimization of airfoil measurements on coordinate measuring machines with contact
type probes. The considered optimization aims to minimize the necessary time
for airfoil coordinate inspection. Minimizing the time for finishing of
metrological task is obtained by minimizing the number of airfoil control
points necessary for coordinate inspections. This mode directly minimized the
costs of the measuring operation but also indirect costs of machining
operation. Milling machines are waiting for the next machining operations
during of airfoils measurement at CMM. The minimum number of points for
airfoil coordinate inspections obtained from the condition that all deviation
of applied interpolation curve to wing surface are within the defined
tolerance. Selected criteria are accuracy of CMM for measurements length
(airfoil chord) increased by the value of the CMM measurement uncertainty.
Developed and presented method was successfully applied on several
international projects. Key words: coordinate measuring machines,
wind tunnel models, wing, airfoil, accuracy. Concept and design
of kinetic energy recuperation system Georgi todorov1, Konstantin kamberov2, Mario Semkov3, *, Nikolay Nikolov4 1) Prof., PhD, Eng., Dean, Faculty of Industrial
Technologies, Technical University, Sofia, Bulgaria 2) Assoc. Prof.,
PhD, Eng., Researcher, Laboratory “CAD/CAM/CAE in Industry”, Faculty of
Industrial Technologies, Technical University, Sofia, Bulgaria 3) Eng., Researcher, Laboratory “CAD/CAM/CAE in
Industry”, Faculty of Industrial Technologies, Technical University, Sofia,
Bulgaria 4) Assoc. Prof., PhD, Eng., Researcher, Laboratory
“CAD/CAM/CAE in Industry”, Faculty of Industrial Technologies, Technical
University, Sofia, Bulgaria Abstract: Power sensitive devices such as computers,
data centers and several manufacturing systems relay on UPS (Uninterruptible
Power Supply). Typically these auxiliary power systems use a battery to be
able to maintain the devices running for a short period of time until the
main or a second power source is resumed. This study is focused on defining
and developing a conceptual model of a UPS device that uses a rotational mass
(flywheel) instead of a battery to store backup energy. The developing of
this design contains a series of steps that allow inertial characteristics of
the flywheel to be calculated for a specific power requirements. Development
approach is demonstrated with an example for reserve energy generator
maintaining 18.5 kW for 25 seconds. The primary advantage of this design is
the ability to obtain a cost-effective solution at early stage of the product
development process. This is achieved by several computational models
prepared to evaluate structural rigidity and efficiency of the system.
Virtual prototyping application combines overall product performance
optimization, time and expenses reduction and detailed diagnosis of ongoing
physical phenomena. Key words: UPS, KERS, engineering analysis, virtual prototyping, flywheel. Complexity measure
for RR intervals, descriptor for arrythmia classification Dragoș AROTĂRIȚEI1,*, Cristian ROTARIU2, Alexandru PĂSĂRICĂ3 1) PhD, Prof., Department of Biomedical Sciences,
“Grigore T. Popa” University of Medicine and Pharmacy, Iasi, Romania 2) Ass. Prof., Department of Biomedical Sciences,
“Grigore T. Popa” University of Medicine and Pharmacy, Iasi, Romania 3) PhD, Department of Telecommunications, Technical
University of Iasi, Iasi, Romania Abstract: The complexity measure is associated with a certain level of randomness for a given discrete sequence of symbols. This assertion was applied to a RR sequence of intervals extracted from preprocessed ECG in order to classify different types of arrhythmias. Three complexity measures were used: sample entropy (the most known), Lempel-Ziv (single level and multilevel) and a less known one, T-Code. The expert system is made by a binary tree classifier that discriminate the class to what arrhythmia belongs. A comparison with other method in term of performance is made also. Key words: complexity measure, randomness, RR sequence, ECG, binary decision
tree. New
designs of rotors with variable geometry parameters in dynamics and their
effective use in aviation and wind energy Raul TURMANIDZE1*, Erekle TSIKARISHVILI2, Giorgi POPKHADZE3 1) Prof., PhD, Head of Department of Production
Technologies of Mechanical Engineering, Georgian Technical University (GTU)
Tbilisi, Georgia 2)
Master, Georgian Technical University (GTU) Tbilisi, Georgia 3) Undergraduate
Student, Georgian Technical University (GTU) Tbilisi, Georgia Abstract: This
article presents the investigation
results upon the dynamics of the working model of rotors with variable
geometry parameters. Through aerodynamic and economic calculations, the
effectiveness of use of such designs for powerful wind stations is proved. It
is presented the analysis of various designs and methods of selection designs
for various conditions of operation of wind installations in wide range of
the wind speed change. Also quite effective method regarding the costs of the
accumulation of wind energy will be suggested, that being the topical world
problem for which development hundreds of millions of US Dollars are spent
annually. Key words: blade, setting angle,
blades twist, wind energy. Additive
manufacturing integration of thermoplastic conductive materials in intelligent
robotic end effector systems Aurelian ZAPCIU1,*, George CONSTANTIN2 1) PhD
Student, Machines and Manufacturing Systems Department, University
"Politehnica"
of Bucharest 2) Prof., PhD, Eng., University "Politehnica" of Bucharest,
Romania Abstract: With
multiple improvements in the field of control systems, sensors and image
processing systems, the applicability of robots is expanding to new areas
previously served by human labor such as harvesting fruit and vegetables. For
these new areas, new and improved end-effector systems are also needed, as
the objects which require handling have diverse dimensional properties,
complex surfaces, varying degrees of softness. These new application areas
demand intelligent features such as touch sensing, gripping force sensing and
accurate position sensing. In the past few years, additive manufacturing has
shifted from rapid prototyping to printing functional parts. Latest polymer
material advances for fused filament fabrication enable printing parts with
various properties, including electric current conductivity. In this paper,
the authors are looking at the novel possibility of integrating these new
conductive materials into simple, yet intelligent end-effector systems.
Several principles have been investigated and analyzed for their usefulness.
The authors have fabricated parts with fused filament fabrication which
integrate force-sensitive electromechanical switches, capacitive sensing or
bend sensors for determining finger position in adaptive grippers. The parts,
3D printed from commercially available filaments, have been subjected to
various tests which demonstrate promising results and potential applicability
in real-life applications. Key words: adaptive
grippers, additive manufacturing, integrated sensing, capacitive touch. Analysis of machining forces in light-force
robotic milling of aluminium parts Adrian Florin NICOLESCU1,*, Andrei
Mario IVAN2, Cezara Georgia COMAN3 1) PhD, Prof., Machines and Manufacturing Systems Department, University
"Politehnica" of Bucharest, Romania 2) PhD, Lecturer, Machines and Manufacturing Systems Department,
University "Politehnica" of Bucharest, Romania 3) PhD, Lecturer, Machines and Manufacturing Systems Department,
University "Politehnica" of Bucharest, Romania Abstract: This article presents the work
performed by the authors in the field of light-force robotic milling of aluminium
parts. The research is focused on applications in which an articulated arm,
low payload robot manipulates the milling-type deburring tool around an
aluminium workpiece, which is clamped on a Kistler 9257B dynamometer which
measured the machining forces. The main objective of the research was to
develop an analysis of machining forces in low-power robotic milling
applications through experimental data acquisition. The experimental
equipment consisted of an articulated arm, 6 DOF Kawasaki FS10E industrial robot with 10 kg payload and a Kistler 9257B dynamometer
capable of measuring the machining forces on three orthogonal directions
corresponding to X, Y and Z axes of the part coordinate system. The robot was
equipped with an ATI RC-340 radially compliant deburring tool. The
experimental procedure was conducted by performing a chamfering operation on
the lateral edges of an aluminium part. The robot program was developed using
the point-to-point block teaching method on the teach-pendant. The program was
then run several times, with gradually increased depth of cut and various
feed rates. The results after each program run were observed by visual
inspection and through data collected by the Kistler dynamometer. Based on
these observations, the conclusions were drawn regarding the milling
efficiency in each situation and the influence of machining forces on robot
behaviour. Key words: robotic milling, machining
forces, edge chamfering, dynamometer, force measurement. Modeling and
simulation of high speed spindle, current problems and optimizations ‒
a survey Andrei GHEORGHIȚĂ1, Dragoș AROTĂRIȚEI2,*, Marius TURNEA3, George CONSTANTIN4 1) PhD Student, S.C. Pro Life Clinics S.R.L., Iasi,
Romania 2) PhD, Prof., Dept. Medical Bioengineering, Univ. of
Medicine and Pharmacy “Grigore T. Popa”, Iasi, Romania 3) Ass. Prof., Dept. Medical Bioengineering, Univ. of
Medicine and Pharmacy “Grigore T. Popa”, Iasi, Romania 4) PhD, Prof., Machine and Production Systems
Department, University Politehnica of Bucharest, Bucharest, Romania Abstract: Rotating machineries play an important
role in industry and medicine. The main purpose of this study is to review in
a systematic mode the main papers published in the area of high speed shafts,
the main problematics and modeling and simulation. The studies about dynamics of spindle bearing assemblies are
concentrated on two parts: one part refers to bearings and another one to
shaft. Some paper deals with optimization of good functionality of assemblies
that means deformations, temperature and vibration are in normal limits due to
different design aspect as location of bearings or shaft design. Key words: Spindle-bearing system, finite element method, stiffness matrix,
dynamic models. Dynamic behavior study used in retrofitting
of a lathe for re-profiling railway wheelset Claudiu BÎŞU1,*, George
CONSTANTIN2, Dorel ANANIA3, Miron ZAPCIU4 1, 2) Assoc. Prof., PhD, Eng., Machines and Manufacturing Systems
Department, University “Politehnica” of Bucharest, Romania 2, 4) Prof., PhD, Eng., Machines and Manufacturing Systems Department,
University “Politehnica” of Bucharest, Romania Abstract: The article is
presenting some aspects regarding the research stages achieved for the
general purpose of retrofitting a machine tool of lathe type used for
profiling/re-profiling of railway wheelset. The process of machine tool
modernization is basically one of changing the conventional feed drives with
drives corresponding to CNC equipment, reusing the machine tool structure.
Therefore, for this purpose the machine tool dynamic characterization was
necessary to be done especially on Y and Z axes in order to assess the
machine rigidity, high and low frequency domains and amplitude vibrations in
idle operation and also during cutting. A specific testing set up was used
for the measurements, the results showing good behaviour of the conventional
machine which was later subject of feed drive replacement. Key words: retrofitting, railway wheelset,
machining, dynamic behaviour, vibrations. Electronic mail: orgcom@icmas.eu |
||||||||||||||||
|
|
