Autor: Kubik, Andrzej - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Impact of the Static Pressure Measurement Accuracy on Barometric Altimeter Errors
Autorzy:: Stanik, Zbigniew
Matyja, Tomasz
Kubik, Andrzej
Powiązania:: https://bibliotekanauki.pl/articles/2174782.pdf
Data publikacji:: 2022
Wydawca:: Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:: barometric altimeter
error correction
external disturbance
MEMS
wysokościomierz barometryczny
korekcja błędów
zakłócenia zewnętrzne
Opis:: The horizontal movement of the pressure sensor in relation to air masses may cause erroneous indications of the altimeter due to the possible measurement of the total pressure, which is the sum of the static and dynamic pressure. This problem mainly concerns devices of small dimensions equipped with barometric altimeters made in MEMS technology, performing complex movements. Small dimensions make it difficult to arrange the pressure intake slots in a way that ensures the measurement of static pressure. Examples include drones (UAH) or bike computers. The aim of the research was to develop an altitude correction formula depending on the speed of the pressure sensor relative to air, which, contrary to those found in the literature, would take into account changes in air density with altitude. The theoretical analysis of the influence of the speed of movement on the indications of the barometric altimeter was evaluated in this paper based on the standard atmosphere model. Methods of correcting errors caused by the measurement of total pressure were proposed. The effectiveness of the proposed methods was verified with simulations (Matlab). Experimental studies were also carried out, which confirmed the theoretical considerations. The experiments performed showed that the problem of correcting errors caused by incorrect measurement of static pressure is very complex. The inertia of the barometer indications plays an important role. The direction of airflow and pressure distribution on the flowing object are also important. The results presented in this paper can be used in the design of systems that improve the quality of barometric altimeter readings. This is particularly important when designing low-budget drone navigation systems and it will improve flight safety.
Źródło:: Safety & Defense; 2022, 2; 62--71
2450-551X
Pojawia się w:: Safety & Defense
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The MEMS-based barometric altimeter inaccuracy and drift phenomenon
Autorzy:: Matyja, Tomasz
Kubik, Andrzej
Stanik, Zbigniew
Powiązania:: https://bibliotekanauki.pl/articles/2203068.pdf
Data publikacji:: 2022
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:: barometric altimeter
MEMS
error correction
drift phenomenon
bicycle computer
wysokościomierz barometryczny
korekcja błędu
zjawisko dryfu
licznik rowerowy
Opis:: MEMS technology has made sensors for measuring barometric pressure and altitude above sea level very cheap and widely used in many consumer electronic devices. This paper presents a theoretical analysis of the sources and types of errors in the barometric altimeter using the standard atmosphere model (ISA). Methods for correcting principal errors caused by non-standard sea level conditions are described and compared. A method of correcting errors in the case of altimeter horizontal movement to the air column and total pressure measurement was proposed. It was compared with another method known from the literature. In the numerical experiment, data recorded by a bicycle computer equipped with a MEMS-based barometric altimeter was analyzed. As the GPS data of the route covered was also known, it was possible to compare the recorded altimeter data with the heights determined from the digital terrain model (DTM), which in this case were considered accurate. The error of the measured altitude calculated in this way was tried to be divided into the principal error, the external error caused by the sensor movement, and the barometer drift. Hence, a numerical experiment was carried out in which, based on the recorded data, an attempt was made to reconstruct non-standard sea level conditions and the impact of speed on the sensor measurements. Furthermore, a method of solving such a reverse problem was proposed. The results of the presented studies can be used in the design of systems correcting the indications of barometric altimeters. The accuracy of the altitude measurement is especially important for small controlled flying objects (UAH) and when recording the route of vehicles moving on the ground.
Źródło:: Zeszyty Naukowe. Transport / Politechnika Śląska; 2022, 116; 141--162
0209-3324
2450-1549
Pojawia się w:: Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Deceleration and deformation during dynamic loading of model car body parts after post-accident repair
Autorzy:: Hadryś, Damian
Kubik, Andrzej
Stanik, Zbigniew
Powiązania:: https://bibliotekanauki.pl/articles/1841191.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:: longitudinal model
post-accident repair
passive safety
impact energy
model podłużny
naprawa powypadkowa
bezpieczeństwo bierne
energia uderzenia
Opis:: Absorption of impact energy by the passive safety elements of the vehicle body is the basic feature to ensure conditions of safety for the driver and passengers in transport. The parts especially designed for this objective in the self-supporting car body are longitudinals. Their energy-absorbing features are designed in different ways. Evaluation of the degree to which the vehicle (body) ensures safety during a collision is difficult and expensive. Usually, tests under impact conditions are required. The most advanced and costly are the tests carried out on a complete vehicle (whole real object for tests). Whole vehicle testing can be replaced by testing of individual car body elements (for example longitudinal). The main aim of this article is to present and compare the results of dynamic studies on model energy-consuming objects (new model longitudinals and model longitudinals repaired with welding methods). For the purpose of this study, models of vehicle passive safety elements (model longitudinals) were designed. On the basis of the conducted tests, it was found that it is worth considering the replacement of collision tests of the whole vehicle by tests of its individual components. This can be considered a new approach that is not widely used. Currently, most often, crash tests of entire vehicles are conducted (high costs) or computer simulations are performer (often with unsatisfactory accuracy).
Źródło:: Transport Problems; 2020, 15, 3; 5-16
1896-0596
2300-861X
Pojawia się w:: Transport Problems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Analysis of shaft wear in turbocharges of automotive vehicles
Autorzy:: Hadryś, Damian
Bąkowski, Henryk
Stanik, Zbigniew
Kubik, Andrzej
Powiązania:: https://bibliotekanauki.pl/articles/375421.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:: charging
internal combustion engine
turbocharger
friction
lubrication
ładowanie
silnik spalinowy
turboładowanie
tarcie
smarowanie
Opis:: The article presents the results of the investigations of turbocharger shaft bearing using different kinds of lubrication conditions (dry friction and lubrication with different kind of oils). In particular, the wear of the turbocharger shaft surface was evaluated. One of the most frequent failures is the seizure of the turbocharger shaft in the slide bearing, causing its rotation, which leads to destruction of the assembly and costly repairs. On the basis of the conducted tests, it was found that the average value of representative breaks surface on the turbocharger shaft are reduced using of a less viscous oil. Similar situation was seen using new oil instead overworked oil – it had an influence on the value of diameter of breaks.
Źródło:: Transport Problems; 2019, 14, 3; 85-95
1896-0596
2300-861X
Pojawia się w:: Transport Problems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Methods for assessing the technical condition of bearing hubs in means of transport
Autorzy:: Stanik, Zbigniew
Kubik, Andrzej
Hadryś, Damian
Csiszár, Csaba
Powiązania:: https://bibliotekanauki.pl/articles/2091239.pdf
Data publikacji:: 2021
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:: vibration diagnostics
bearing
wear
means of transport
diagnostyka drgań
łożysko
zużycie
środki transportu
Opis:: This article presents two methods of testing bearing hubs, which may supplement the existing subjective and unreliable methods of diagnostics of rolling bearings used in wheel bearing hubs of motor vehicles and other means of road transport. One of the most important elements responsible for the safety of a vehicle is the bearing hub. Regular monitoring of the technical condition of bearings should become an obligation at vehicle inspection stations when carrying out a technical inspection of a vehicle, authorising it to travel on public roads. This article presents the results of vehicle tests with signs of damage to rolling bearings, using two test stands: one on which the dynamic balancer acted as a device for accelerating the wheel, and the other, which was designed as a test dedicated to automotive rolling bearings, where a dynamic weighbridge was used as the wheel drive, made it impossible to test the wheel at lower rotational speeds. The newly designed and manufactured bearing testing device eliminates the disadvantages of the previous stand, and additionally, enables the measurement of a fully loaded bearing hub, which enables the simulation of real operating conditions on the bearing hub.
Źródło:: Zeszyty Naukowe. Transport / Politechnika Śląska; 2021, 113; 191--204
0209-3324
2450-1549
Pojawia się w:: Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Impact of selected operational parameters on measures of technical condition of rolling bearings in means of transport built based on analysis of vibration signals
Autorzy:: Kubik, Andrzej
Stanik, Zbigniew
Hadryś, Damian
Csiszár, Csaba
Powiązania:: https://bibliotekanauki.pl/articles/2134861.pdf
Data publikacji:: 2021
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:: vibration diagnostics
bearing
wear
means of transport
diagnostyka drgań
łożysko
zużycie
środki transportu
Opis:: This article presents an innovative method of diagnostics of rolling bearings used in the bearing nodes of motor vehicles, with the use of a prototype specialist stand. The tests were carried out based on a developed research plan, which included the impact of damage to the bearing and tyre of the vehicle, as well as the vehicle speed. Vibration accelerations were recorded in three measurement axes. Signal spectra were created based on the time courses of the vibration signals and were further analysed. The presented method is aimed at detecting excessive wear of rolling bearings in wheels from its early period.
Źródło:: Zeszyty Naukowe. Transport / Politechnika Śląska; 2021, 111; 89--98
0209-3324
2450-1549
Pojawia się w:: Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Analysis of tribological wear in block – on ring contact on tribological tester T-05
Autorzy:: Kubik, Andrzej
Hadryś, Damian
Stanik, Zbigniew
Jasiok, Marek
Powiązania:: https://bibliotekanauki.pl/articles/196663.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:: friction
lubrication
DLC layer
tarcie
smarowanie
powłoka DLC
Opis:: Friction is one of the most common phenomena in this technique. The friction process in the tribography systems causes both energy losses and consumption process losses. The layer of the surface of a solid body differing from the material to the entire volume of the solid is a close participant in the tribological process. The effects of external influences during treatment of the material and in friction processes were established and modified. The well-shaped layer of the surface provided optimum tribological properties during operation. This work provides an analysis of the use of a tribological pair working in a rotational movement, in different operating conditions. The tests carried out showed the impact of the selected exploitation factors, that is, the speed and load, the consumption and the friction coefficient of the saliva and the graphical interpretation of results from the results obtained from experimental and metallographical studies. The tests carried out in the block-on ring position of the T-05 tribology was the nature of preliminary tests. Preliminary tests enabled the effects of designated performance parameters to be determined on selected tribological properties. Low-carbon steel used for heat-chemical treatment and steel with DLC coating was used for the test. Metallographic studies enabled the dominant use mechanism to be determined, depending on external factors. The application of the above-mentioned value for materials currently used in various types of constructions allows for extending the life of a given device without major financial and constructional costs. A wide range of applications can bring many benefits to the current design solutions, in which the efficiency of the entire device can be easily improved.
Źródło:: Zeszyty Naukowe. Transport / Politechnika Śląska; 2019, 105; 113-123
0209-3324
2450-1549
Pojawia się w:: Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:: Biblioteka Nauki