|
Journal PROCEEDINGS IN MANUFACTURING SYSTEMS |
|
ISSN 2343–7472 ISSN-L 2067-9238 |
|
|
|
|
Journal PROCEEDINGS IN MANUFACTURING SYSTEMS □
Volume 18, Issue 2, 2023
·
Tudor George ALEXANDRU,
Bogdan Marian VERDETE, Marius Vali LAZAR,
System identification approach for evaluating the thermal behaviour
of printed circuit boards
·
Adrian MAROȘAN, George
CONSTANTIN, Claudia Emilia GÎRJO3,
Anca Lucia CHICEA, Mihai CRENGANIȘ,
·
Claudiu Florinel BÎȘU, Dorel
Florea ANANIA, Emilia BĂLAN, Cosmin GOGU, Andra Elena PENA,
Vibration analysis of a microsatellite panel during the shaker
testing
·
Elena BACIOI, Adrian ISPAS,
Eduard BENDIC,
Analysys of end mill durability when processing wood composite
materials
·
Adrian ISPAS, Elena BACIOI,
Eduard BENDIC,
Industrial depolutation using the ultrasonic cavitation method
·
Elena BACIOI, Adrian ISPAS,
Eduard BENDIC, Ramy OBEIDAT,
Study of temperature in processing wood composite materials using end
mills
System identification approach for evaluating the thermal
behaviour of printed circuit boards Tudor George ALEXANDRU1,*, Bogdan Marian VERDETE2, Marius Vali LAZAR 1)
Lecturer, PhD, Robots and Manufacturing Systems Dep., National University of
Science and Technology Politehnica Bucharest, Romania 2)
Assistant Prof., Robots and Manufacturing Systems Dep., National University
of Science and Technology Politehnica Bucharest, Romania 3)
Assistant Prof., Manufacturing Engineering Dep., National University of
Science and Technology Politehnica Bucharest, Romania
Abstract:
The
present paper proposes a new approach for capturing the temperature
gradients that occur at the Junction-To-Board level of printed circuit
boards. Experiments are conducted in the first stage for evaluating the
behavior of the individual heat sources. Examples include: integrated
circuits, CPUs or voltage regulators. A step instruction cycle is considered
to ensure the maximum amount of dissipated power. Thermal acquisition is
carried out with the support of the temperature sensors that are embedded in
the heat sources. The resulting temperature curves match the description of
a First-Order Plus Dead Time system. Thus, the Sundaresan and Krishnaswamy
method is employed for evaluating the dead time, gain and time constant of
the process. The resulting transfer function can replicate the behavior of
electronic packages by considering any input instruction cycle. In the next
stage, a simulation model is developed comprising a simplified
representation of the printed circuit board and its components. Prescribed
body temperatures are considered as boundary condition for all heat sources.
Subsequently, natural or forced convection cooling is included to model the
interaction between the assembly and the surrounding environment. The
temperature gradients can be visualized at the level of the PCB for
evaluating thermal related issues. Examples include: hot spots, thermal
runaway or uneven heat distribution. A practical study is included regarding
the heat transfer that occurs in a Socket 462 motherboard. Opposed to
existing approaches, the present methodology does not require extended
knowledge in electronics heat transfer.
Real time data acquisition of
low-cost current sensors ACS712-05
and INA219 using
Raspberry PI, DAQCplate
and
Node-RED Adrian MAROȘAN1,*, George CONSTANTIN2, Claudia Emilia GÎRJOB3, Anca Lucia CHICEA4, Mihai CRENGANIȘ5 1)
Asst. Prof., PhD,
Machines and
Industrial Equipment,
University "Lucian
Blaga" of Sibiu,
Faculty of
Engineering, Romania 2)
PhD, Prof., Robots and Manufacturing Systems Department, University
"Politehnica" of Bucharest, Romania 3)
Assoc. Prof., PhD,
Machines and
Industrial Equipment,
University "Lucian
Blaga" of Sibiu,
Faculty of
Engineering, Romania 4)
Assoc. Prof., PhD,
Machines and
Industrial Equipment,
University "Lucian
Blaga" of Sibiu,
Faculty of
Engineering, Romania 5)
Lecturer, PhD,
Machines and
Industrial Equipment,
University "Lucian
Blaga" of Sibiu,
Faculty of
Engineering, Romania Abstract: Current monitoring is critical to ensuring the proper operation of equipment and mobile devices, providing vital information about battery health, range, and charge level. This study focuses on the use of two affordable sensors, ACS712-05 and INA 219, for real-time current monitoring. These sensors can be easily integrated into a variety of applications such as mobile robots, drones, or photovoltaic panels. To collect the data from these sensors, a Raspberry Pi minicomputer is used in combination with a DAQCplate data acquisition board. Custom models are developed in Node-RED, containing specific blocks for data acquisition of each sensor, to facilitate the current monitoring process. Analyzing the data obtained from these sensors, several important conclusions are made. These conclusions provide a deeper understanding of how current monitoring technologies can be implemented and highlight significant differences between the various approaches. The results of this study are especially valuable for the further development of mobile equipment or modular mobile robots. They provide essential clues for improving the performance and efficiency of these devices.
Vibration analysis of a microsatellite panel during the shaker testing Claudiu Florinel BÎȘU1,*, Dorel Florea ANANIA2,*, Emilia BĂLAN3, Cosmin GOGU4, Andra Elena PENA5 1, 2, 3) Assoc. Prof., PhD, Robots and Production Systems Department, National University of Science and Technology "Politehnica", Romania 4)
PhD Student, Robots and Production Systems Department,
National University of Science and Technology "Politehnica" Bucharest,
Romania 5) Lecturer, PhD, Robots and Production Systems Department National University of Science and Technology "Politehnica" Bucharest, Romania
Abstract:
Microsatellites are the subject of many research projects addressed today in
universities. This paper presents the results of vibration tests on a
microsatellite type CARDSAT which is a new concept designed for volume
optimization and flexibility. A Cardsat is a thin panel-shaped satellite
with low volume and weight. The concept optimizes the volume of the
microsatellite and, by using more panel free or link between them, a complex
configuration can be designed. Tests are made according with space standards
for microsatellite launch requirements. Tests such as shock, random
vibration, low-level sine-sweep and
high-level sine
are made on a CARDSAT 3U prototype
by using a shaker device and
data acquisition board. The dynamic behavior of a single, fully
equipped panel is stable, without identifying defects after testing. The
determination of the own frequencies is a necessary condition for compliance
with the test conditions, to avoid the phenomenon of resonance on the test
stand. For the tested CARDSAT panel the own frequencies were 15.8 Hz and
17.2 Hz. The main objectives of the
tests are to validate the concept and prepare and check the set-up
parameters of the testing stand in order to be used for more complex
prototype.
Analysys of end mill durability when processing wood
composite materials Elena BACIOI1,*, Adrian ISPAS1, Eduard BENDIC1 1)
PhD Student, National University of Science and Technology Politehnica
Bucharest, Romania Abstract: This article presets an approach regarding the influence of cutting regimes of wood composite materials on the wear of end mills. The three wood composite characteristics are presented. The experimental tests on the wear of HSS end mill of 10 mm diameter (the most used in the furniture industry) are considered. Nine milling cutters are used in dry cutting for three materials. Before being introduced into processing, they are calibrated using an electronic scanner. Then these are used to process the samples, with a constant cutting speed and three feed rates. Further, the dimensional measurements are done on the same electronic scanner to emphasize the wear on diameter. The experiments continues with the use of a new set of 9 end mills that are initially measured with the same electronic scanner and introduced into processing using the same cutting regimes with the difference that a compressed air jet is used in the work area as a cooling agent. The results are compared and processed using the least squares method.
Industrial depolutation using the ultrasonic cavitation method
Adrian ISPAS1,*, Elena BACIOI1, Eduard
BENDIC1
1)
PhD Student, National University of Science and Technology Politehnica
Bucharest, Romania
Abstract:
Ultrasonic cavitation represents a widely used process in the industry.
Lately, it has been applied in modern and effective methods for industrial
air pollution control. The phenomenon of ultrasonic cavitation, applicable
in air pollution control in auto service facilities is based on the
principle of fragmenting pollutant particles using the ultrasonic frequency
produced by a set of ultrasonic transducers mounted on the bottom of a tank
containing water. The particles, thus transformed into fine powder, settle
at the bottom of the tank and are purged after a certain time. Polluted air
from auto body shops is forced to pass through the water tank where the
transducers vibrate. Afterward, the decontaminated air is expelled through
the top of the ultrasonic tank and released into the atmosphere. The
advantage of this method lies in the fact that polluted industrial spaces
can be more easily decontaminated at lower costs compared to traditional
pollution control methods based on the use of mechanical filters.
Study of temperature in processing wood composite materials using end mills Elena BACIOI1,*, Adrian
ISPAS1, Eduard BENDIC1, Ramy OBEIDAT1 1)
PhD Student, National University of Science and Technology Politehnica
Bucharest, Romania
Abstract:
The
processing of composite wood materials is done with high-speed steel tools,
diamond-coated or reinforced with metal carbide-plated tools. In the present
research, we approached the processing of wood composite materials with
high-speed steel end mill using compressed air as a cooling agent. Parallel
to this new processing method, a thermal imaging camera is used that
monitors the temperature in the tool, throughout the processing. A database
is thus created which, later processed with the least squares method,
highlighted the increase in tool durability compared to the classical method
(without air-cooling). An electronic scanner that measures the end mill
parameters before and after processing, a thermal imaging camera and three
types of wood composite materials (PAL, MDF, and MULTIPLEX) are also used.
Electronic mail: orgcom@icmas.eu
|
||||||||||||||||
|
|
