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Journal PROCEEDINGS IN MANUFACTURING SYSTEMS |
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ISSN 2343–7472 ISSN-L 2067-9238 |
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Journal PROCEEDINGS IN MANUFACTURING SYSTEMS □
Volume 17, Issue 4, 2022 · Corina
BOTEZ, Sorin-Constantin BOTEZ, Tiberiu Gabriel DOBRESCU, The evolution of study programs in Romanian technical higher education
in recent years · Crina DUTA, Nicoleta CARUTASU,
Iulia STANICA, Capability
maturity model and testability maturity model ‒ a comparative
approach · Claudiu BISU, George
CONSTANTIN, Critical speed
analysis for avoiding resonance in heavy duty rotating machines Case study of
structures based on hyperbolic geometry The
evolution of study programs in Romanian technical higher education in recent
years Corina BOTEZ1,*, Sorin-Constantin BOTEZ1, Tiberiu-Gabriel DOBRESCU2 1) Assistant Prof., PhD, Graphics Engineering and Industrial Design Department,
University “Politehnica” of Bucharest, Romania 2) Prof., PhD, Robots and Manufacturing Systems Department, University
“Politehnica” of Bucharest, Romania Abstract: The purpose of this article is to
emphasize the evolution of study programs in the Romanian technical higher
education field according to labor market requirements along with the
development of the Industry 4.0. In this respect the whole education system,
including the higher education area, faces significant challenges in fulfilling
their role of training the future graduates who will have to own the
necessary skills required by the industry developments. The main objective of
our research is to explore the study programs development from 2018 until
2022, by analyzing each technical study area according to the Romanian
legislation in place. The analysis covered 40 Romanian universities and 18
technical study areas, resulting 6828 technical study programs. As one knows,
the main challenge of the traditional education system has always been the
way of transforming students into a well-prepared labor force owning the
right skills. This represents the first step to access a suitable job on the
labor market. With the emergence of Industry 4.0, the new demanded jobs
require universal specialists having specific technical and essential skills
in a specialized field, being able to be flexible to rapid technological
changes and flexible to interaction with automated machines and robots. The
study programs analyzed in this paper highlight the evolution of technical
higher education study areas in the direction required by Industry 4.0
allowing graduates to access new occupations at national and European level. Key
words: Industry 4.0, Education 4.0, study programs,
skills, occupations. Capability maturity model and testability
maturity model ‒ a comparative approach Crina DUTA1, Nicoleta CARUTASU2,*, Iulia STANICA3 1) PhD Student, Doctoral School of
Industrial Engineering and Robotics, University "Politehnica" of
Bucharest, Bucharest, Romania 2 Prof., PhD, Department of Robots and
Manufacturing Systems, University "Politehnica" of Bucharest,
Romania 3)
Assistant Prof., PhD Department of Engineering in Foreign Languages,
University "Politehnica"of Bucharest, Romania Abstract: Inmost fields of activity, devices are used, and their key element is the software used to meet the needs of the users. Since users consider these devices to be the necessary tools to use to support them in the way they carry out their activity, the emphasis of software product developer organizations is placed on the quality that the product has when it becomes available on the market. During the development life cycle of a software product, the gap between the stage of practice and the stage of theory was observed, and thus measures were taken to improve the development processes. In order to improve the development processes of software products as well as their testing, optimization models such as Capability Maturity Model and Testability Maturity Model were created. The main similarity between these two methods is due to the fact that the Testability Maturity Model is complementary to the Capability Maturity Model and both work on five maturity levels. These models bring with them a series of benefits to the organizations that follow them and put them into practice, but at the same time, they also have weak points for which coverage solutions must be found. The aim of the paper is to carry out a comparative analysis between these two models and to identify the weak points of these models. Key
words: software processes, management, testing process,
quality improvement, market. Critical speed analysis for avoiding
resonance in heavy duty rotating machines Claudiu BiSU1.*, George CONSTANTIN2 1) Assoc. Prof., PhD, Robots and Manufacturing Systems Department,
University "Politehnica" of Bucharest, Romania 2) Prof., PhD, Robots and Manufacturing Systems Department, University
"Politehnica" of Bucharest, Romania Abstract: This studies the phenomenon of
resonance during operation by using both a theoretical analysis and an
experimental one performed directly on the installed equipment. The
considered case study is based on the analysis of the dynamic behavior of a 2
MW electric generator from a hydroelectric plant that is driven by a
horizontal shaft turbine and a gearbox. The rotating assembly is measured
from the point of view of geometric precision and dynamic balancing and
mounted on the four supports on the base plate. However, during operation, by
increasing the working speed both without load and with, critical speeds
appear that lead to vibrations above the permissible ones, which are
attributed to the phenomenon of resonance. To determine the sources of
vibrations, the assembly is dynamically measured in the area of its bearings
in three directions (X, Y and Z). A procedure is applied to determine the
vibrations depending on the speed and the load in operation. When the system
reaches the critical speeds, the highest level of vibrations is recorded in
the X direction in the horizontal plane, exceeding the allowed ISO limits.
Vibration measurements are also carried out in other points outside the
bearings. Next, considering the theoretical aspects that reveal the fact that
vibrations are influenced by stiffness, mass and damping, the stiffness is
modified at the level of attachment of the assembly to the supports together
with the operation of ensuring the coplanarity of the attachment surfaces
with the plane of the base plate. Practically, the tightening force is
optimized by tension release in repeated cycles of force adjustment and
dynamic measurement. After application of the procedure, the level of
vibrations falls within the permissible limits. Key
words: generator, vibration, stiffness, critical speed,
dynamic test.
Design of a color detector device
with display and speaker by using additive manufacturing and Arduino boards Andrada Elena KUBASZKY1, Patricia Isabela BRAILEANU2,*,
Tiberiu Gabriel DOBRESCU3, Nicoleta-Elisabeta PASCU4 1) Eng., Department
of Machine Elements and Tribology, University Politehnica of Bucharest,
Romania 2) Lecturer PhD.
Eng., Department of Machine Elements and Tribology, University Politehnica of
Bucharest, Romania 3) Prof. PhD. Eng.,
Department of Robots and Production Systems, University Politehnica of
Bucharest, Romania 4) Assoc. Prof.
PhD. Eng., Department of Robots and Production Systems, University
Politehnica of Bucharest, Romania Abstract: The human eye is one of the most important and complex sensory organ. Sight is the main way to perceive shapes, colors, objects, distances, etc. That is why it provides the most information that helps us to understand the world around us. Most of the common activities in people's lives require visual perception, such as driving a car, cleaning the house, reading, choosing fruits and vegetables or matching clothes. This article proposes a foray into the rapid prototyping of a color reading device that comes to the aid of people with visual impairments, such as dyschromatopsia, by using electronic components available on the market, the Arduino board and additive manufacturing using PLA material. Key
words: color detector, device, additive
manufacturing, rapid prototyping, PLA. Case study of structures based on hyperbolic
geometry Patricia Isabela BRAILEANU1,* 1) Lecturer PhD. Eng., Department of Machine Elements and Tribology,
University "Politehnica" of Bucharest, Romania Abstract: Structures based on hyperbolic surfaces are present in various fields, both in industrial engineering as integral parts of a structural ensemble, as well as in domains such as architecture or even art. Most often, this type of structure can be found in industry within the cooling structures of oil refineries or petrochemical plants as cooling towers. This article aims to analyze a form built based on a hyperboloid of one sheet, to which structures intended to strengthen the overall geometry have been added as ribs. Multiple iterations of the same geometry have been generated, ranging from the basic geometry without ribs to the basic geometry with the addition of 10 ribs. The analysis can provide valuable insights into how these reinforcing elements can enhance the overall integrity and performance of the hyperboloid–based structures. The research aims to enhance understanding of the mechanical performance of these structures and their potential for use in practical applications. Key
words: hyperboloid structure, reinforced structures,
static analysis. Electronic mail: orgcom@icmas.eu
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