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Tytuł:
Numerical investigation on the vibration reduction of rotating shaft using different groove shapes of tilt bearing
Autorzy:
Abbood, Ahmed Imad
Abdulla, Fadhel Abbas
Powiązania:
https://bibliotekanauki.pl/articles/2203648.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
tilt bearings
bearing groove
rotor system
ANSYS transient
fluent
vibration reduction
finite elements
układ wirnikowy
ANSYS
redukcja drgań
badanie numeryczne
łożysko
Opis:
Vibration control is very important for high-speed rotors. Oil film damping is considered an effective vibration-damping method, especially for long shafts in gas turbines, ships, and other high-speed rotating equipment. The existing groove in the internal surface of the tilt bearing increases the amount of oil that flows through the bearing; this is more effective in suppressing the vibration of the rotor system carried by the plain bearing. In order to suppress the vibration of the rotor system, which is supported by sliding bearings, a different groove-shaped oil flow (GSOF) is studied and analysed in this paper. A different shape of grooves in bearings was set up and measured to study the vibration-damping effect of the flow oil shape with GSOF. ANSYS software presents significant benefits to engage Fluent for oil flow with Transient structural for vibration measurements. This paper uses these terms to perform the simulation numerically to explore the groove-shaped damper's damping effect under the rotor system. The study identified three enhancements of vibration and settling time. First, the circular groove showed a 35.71% reduction in amplitude and 10% increase in stilling time; the next one is the circular groove which reduced the amplitude by 42.85% and the settling time by 0%. The third modification was the inclined groove which reduced the amplitude by 42.85% and the settling time by 12%. The last one was the triple-inclined groove, which reduced the amplitude and settling time by 57.14% and 20%, respectively.
Źródło:
Diagnostyka; 2023, 24, 3; art. no. 2023304
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Steady-state comparison of torque vectoring and vehicle tilt influence on narrow car steering characteristics
Porównanie wpływu różnicowania sił napędowych i przechyłu pojazdu na charakterystykę sterowności wąskiego pojazdu w stanie ustalonym
Autorzy:
Weigel-Milleret, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2215594.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Technologiczno-Humanistyczny im. Kazimierza Pułaskiego w Radomiu
Tematy:
narrow vehicle
steering characteristics
vehicle tilt
torque vectoring
vehicle modeling
wąski pojazd
charakterystyka sterowności
pojazd przechyłowy
różnicowanie sił napędowych
modelowanie ruchu pojazdu
Opis:
Article compares the roll-to-curve and torque vectoring impact on a steering characteristics. The comparison is based on an adopted for tilt mathematical model with two DOFs. The lateral tire forces are a function of the tire sideslip angle and the angle of tilt. The first chapter contains a description of the vehicle for which a series of road tests and simulations was carried out. Next chapter contains an experimental verification of the mathematical model of the vehicle and the simulation tests carried out. The paper describes the mathematical model of the vehicle used to perform the simulation. The next chapter contains the description and results of steady-state simulations examining the effect of differentiation of driving forces on the steering characteristics and the impact of tilt angle on the steering characteristics. The article ends with the chapter containing the conclusions.
Źródło:
Journal of Civil Engineering and Transport; 2023, 5, 1; 47-56
2658-1698
2658-2120
Pojawia się w:
Journal of Civil Engineering and Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The performance analysis of dusty photovoltaic panel
Autorzy:
Katoch, Minakshi
Dahiya, Vineet
Yadav, Surendra Kumar
Powiązania:
https://bibliotekanauki.pl/articles/27312227.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
dust accumulation
tilt angle
photovoltaics
solar panel
transmittance
Opis:
Solar photovoltaic power is widely utilized in the energy industry. The performance of solar panels is influenced by different variables, including solar radiation, temperature, wind speed, relative humidity and the presence of haze or dirt. Outdoor solar panels are particularly susceptible to a decrease in energy efficiency due to the accumulation of dust particles in the air, which occurs as a result of natural weather conditions. The extent of dust deposition is primarily determined by factors such as the tilt angle of the panel, wind direction, cleaning frequency as well as local meteorological and geographical conditions. The dust on the solar cell glazing reduces the optical transmittance of the light beam, causing shadowing and diminishing the energy conversion productivity of the panels. Sand storms, pollution levels and snow accumulations all significantly impact the photovoltaic panel performance. These circumstances reduce the efficiency of solar panels. The experiment was carried out on two identical dust-accumulated and dust-free panels. The evaluation was carried out in two different situations on the offgrid stand-alone system: in a simulated atmosphere and in an open space during the day. The current-voltage curves have been developed for both panels at various tilt degrees. The features provide sufficient information to analyse the performance of the panels under consideration. The measurements demonstrate that as dust collects on the panel’s surface, the average output power and short circuit current decrease dramatically. The installation tilt angle affected the ratio of efficiency and average power outputs of dusty and clean panels.
Źródło:
Archives of Thermodynamics; 2023, 44, 2; 49--68
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tilt Angle of Wood Dust
Autorzy:
Ockajova, Alena
Banski, Adrian
Tomasz, Rogoziński
Powiązania:
https://bibliotekanauki.pl/articles/24072422.pdf
Data publikacji:
2023
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
wood dust
tilt angle
cleaning of dust
way of machining
Opis:
Tilt Angle of Wood Dust. The aim of this article is to point out a risk factor – wood dust, which settles on various structures, inclined surfaces in operation and, if not regularly cleaned, it is a source of secondary dust, because it is swirled up again with any movement. By measuring the tilt angle of bulk wood material obtained from sawing on a table circular saw, using different saw blades and wood dust from longitudinal and transverse sanding on a hand belt sander, we determined which characteristics affect it. We found that the size of the particles is an important characteristic, the larger they are, the smaller the tilt angle and also the surface of the pad on which the dust particles settle, wood did not play a significant role in this case. The smallest tilt angle was measured for sawdust from longitudinal sawing of 27°, and the largest tilt angle for wood dust from transverse sanding of oak and was 57° on beech pad.
Kąt nachylenia pyłu drzewnego. Celem tego artykułu jest zwrócenie uwagi na czynnik ryzyka - pył drzewny, który osadza się na różnych konstrukcjach, nachylonych powierzchniach podczas pracy. Jeśli nie jest regularnie usuwany, jest źródłem pyłu wtórnego, ponieważ jest ponownie zawirowywany przy każdym ruchu. Mierząc kąt pochylenia sypkiego materiału drzewnego uzyskanego z piłowania na stołowej pilarce tarczowej, przy użyciu różnych brzeszczotów i pyłu drzewnego ze szlifowania wzdłużnego i poprzecznego na ręcznej szlifierce taśmowej, ustaliliśmy, które cechy mają na to wpływ. Stwierdziliśmy, że rozmiar cząstek jest ważną cechą, im są one większe, tym mniejszy kąt pochylenia, a także powierzchnia podkładki, na której osadzają się cząstki pyłu, drewno nie odgrywało w tym przypadku znaczącej roli. Najmniejszy kąt pochylenia zmierzono dla trocin z piłowania wzdłużnego 27°, a największy kąt pochylenia dla pyłu drzewnego ze szlifowania poprzecznego dębu i wynosił 57° na podkładce bukowej.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2023, 121; 37--42
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geophysical assessment for gold mineralization potential over the southern part of Kebbi State using aeromagnetic data
Autorzy:
Augie, Abdulrahaman Idris
Salako, Kazeem Adeyinka
Rafiu, Adewuyi Abdulwaheed
Jimoh, Mufutau Owolabi
Powiązania:
https://bibliotekanauki.pl/articles/2124698.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
gold mineralization
Yauri-Zuru schist belt
Centre for Exploration Targeting (CET)
first vertical derivatives (FVD)
second vertical derivatives (SVD)
source parameter imaging (SPI)
tilt derivative (TDR)
Opis:
The magnetic signatures over the southern part of Kebbi State and its environs were analyzed together with the geological settings of the area to delineate the structures that may host gold mineralization. The aeromagnetic data used was the survey carried out by Fugro airborne surveys between 2005 and 2010 on behalf of the Federal Government of Nigeria. The reduction to equator (RTE), first and second vertical derivatives (FVD and SVD), Centre for Exploration Targeting (CET), analytic signal (AS), source parameter imaging (SPI) and tilt derivative (TDR) techniques were applied to the magnetic data covering the area. The results of the AS technique revealed that the study area is characterized with high amplitudes of magnetic anomalies (above 0.048 nT/m) and these could be of ferromagnetic minerals such as gold. The FVD, SVD, CET and TDR techniques also helped in delineating the lineaments (such as faults, fractures or shears zones) believed to be associated with alteration zones which play an important role in determining gold mineralized zones. The direction of the orientation of these features/lineaments trended in the NE-SW direction. The faults, fractures or shears zones delineated represent veins of possible mineralization. The depth of occurrence to the causative bodies using SPI algorithms was found to be below 137 m. Structures delineated within the area, when compared with the geological setting of the area, correspond to: quartz-mica schist, granite, biotite, gneiss, diorite, medium coarse-grained and biotite hornblende granite. Results from these techniques revealed alteration zones that may host gold. These regions correspond to the following areas: SE parts of Yauri and Shanga, Fakai, Ngaski, Zuru, Magama, Rijau, and the eastern part of Wasagu/Danko and Bukkuyum.
Źródło:
Geology, Geophysics and Environment; 2022, 48, 2; 177--193
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mikroprocesorowy system do badania zaburzeń równowagi
Microprocessor system for examining imbalances
Autorzy:
Sauer, Piotr
Leśna, Weronika
Stolc, Zuzanna
Zielińska, Zofia
Powiązania:
https://bibliotekanauki.pl/articles/31343823.pdf
Data publikacji:
2022
Wydawca:
Międzynarodowe Stowarzyszenie na rzecz Robotyki Medycznej
Tematy:
zaburzenia równowagi
akcelerometr
bluetooth
rehabilitacja
układ równowagi
mikrokontroler
wychylenie od pionu
balance disorders
accelerometer
rehabilitation
balance system
microcontroller
tilt from the vertical
Opis:
Celem pracy było opracowanie systemu monitorowania zaburzeń równowagi. Zaproponowany system może być przeznaczony zarówno do diagnostyki, jak i rehabilitacji zaburzeń równowagi. System umożliwia odczytywanie danych dotyczących przyspieszenia z dwóch osi pomiarowych czujników MPU6050, a następnie przeliczeniu ich na wartości procentowe. Tak przetworzone dane wysyłane są do opracowanej aplikacji mobilnej za pomocą protokołu Bluetooth. Lekarz lub fizjoterapeuta może przeprowadzić analizę badań na podstawie danych zebranych w tabeli lub wizualizacji. Zebrane dane przechowywane są w chmurze, a następnie wyświetlane na wykresach w aplikacji. W pracy zaprezentowano wyniki pracy dyplomowej inżynierskiej [1].
The aim of the work was to develop a system for monitoring imbalances. The proposed system can be used both for the diagnosis and rehabilitation of balance disorders. The system can read acceleration data from the two measuring axes of the MPU6050 sensors and then convert them to percentages. The data processed in this way is sent to the developed mobile application via the Bluetooth protocol. The doctor or physiotherapist can analyze the research on the basis of the data collected in the table or visualization. The collected data is stored in the cloud and then displayed on charts in the application. In the presentation work, the results of the engineer diploma thesis [1].
Źródło:
Medical Robotics Reports; 2022, 10/11; 44-51
2299-7407
Pojawia się w:
Medical Robotics Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of Ladle Tilting Speed for Preventing Temperature Drops in the Die Casting Process
Autorzy:
Ando, Haru
Minamide, Daichi
Takagi, Yuto
Yano, Ken’ichi
Nakamura, Naoto
Sano, Masahiro
Aoki, Takahiro
Nemoto, Yasunori
Powiązania:
https://bibliotekanauki.pl/articles/2172385.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
temperature drop
die casting
optimization
pouring
ladle tilt
Opis:
In die casting, molten metal poured into a shot sleeve is pressed into a mold by a plunger at high speed. The temperature of the metal drops significantly while it is being poured from the ladle to the shot sleeve, resulting in casting defects such as misrun flow lines. Although it is important to control the temperature at all stages of the process, a method for minimizing temperature loss has not yet been clarified to date. In this study, the cause of the temperature drop in the shot sleeve was clarified, and a method of optimizing the ladle tilting speed was proposed to prevent temperature drop. First, experiments were conducted to measure the decrease in metal temperature in the sleeve during pouring. These experiments revealed that the metal cools significantly from the moment it touches the shot sleeve. Therefore, the time from the first contact between the shot sleeve and the metal to the start of pouring was set as the objective function. A genetic algorithm was then used to derive the optimal ladle tilting speed pattern to suppress the temperature drop. This analysis confirmed that the metal was poured without flowing out or running ahead and that the immediate liquid level vibration after pouring was suppressed, thus ensuring stable pouring.
Źródło:
Journal of Casting & Materials Engineering; 2022, 6, 4; 69--75
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deformation and damage to buildings caused by ground movements in mining areas (case study)
Autorzy:
Florkowska, Lucyna
Bryt-Nitarska, Izabela
Kruczkowski, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/2073381.pdf
Data publikacji:
2021
Wydawca:
Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:
building damage
mining areas
subsoil deformations
tilt measurement anthropocene
szkody budowlane
tereny górnicze
deformacje podłoża gruntowego
pomiary nachylenia antropocenu
Opis:
Human activity causes transformations in the near-surface layers of the rock mass, which result in long-term impacts on buildings and engineering infrastructure. Mining activities are particularly disadvantageous in this context, as they trigger severe deformation processes that reach the soil surface as a result of the excavation of deposits. The prevention of accidents and disasters caused by these impacts is based on knowledge derived from observation. Therefore, the aim of this study was to acquire and update knowledge on the impact of mining-related ground deformation and tremors on buildings. The paper presents the results of measurements carried out on a group of buildings located in an underground mining area. The buildings have been affected by mining impacts since their construction in the 1980s. Despite the implementation of appropriate structural protection, the structures have been suffering deformation and damage. For the purposes of the study, two two-axis inclinometers were installed on the 15.2 m high bell tower, taking measurements at 6-hour intervals. Over a period of 10 months, changes in the leaning of the tower were measured and the condition of the other buildings observed. The study resulted in obtaining: values for the change in tilt of the two perpendicular walls of the tower (over a period of 10 months),correlation of the results with tremors measurements and periodic surveying measurements of the inclination of the vertical edge of the tower, image of damage to buildings caused by mining deformation of the ground. On the basis of an analysis of the location and timing of minefields excavation, the occurrence of real ground movement in the mining areas, continuing even after the end of mining works, was confirmed and irregular deformation of the originally perpendicular walls of the masonry tower building was demonstrated. The tower did not behave as a rigid body; its horizontal profile was deformed.
Źródło:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych; 2021, 4; 52--63
2450-1859
2450-8721
Pojawia się w:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Making virtual reality accessible for language learning: applying the VR application analysis framework
Autorzy:
Frazier, Erin
Lege, Ryan
Bonner, Euan
Powiązania:
https://bibliotekanauki.pl/articles/2097445.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej w Lublinie. IATEFL Poland Computer Special Interest Group
Tematy:
virtual reality
VR Application Analysis Framework
immersive capacity
communicative capability
CALL
Tilt Brush
Opis:
Virtual Reality (VR) is a valuable tool for learning, however, there is a lack of education-focused content for language learning needs. This article introduces the VR Application Analysis Framework (Lege, Bonner, Frazier, & Pascucci, 2020) to assist educators in scaffolding existing commercial off-the-shelf (COTS) applications for use in classroom activities through four key lenses: immersive capacity, cognitive load, purpose, and communicative capability. The framework is then used to analyze the strengths and weaknesses of an example COTS VR application, Tilt Brush. This analysis, completed using the framework, is followed by three lesson plans for Tilt Brush that demonstrate how VR could be used in the language classroom.
Źródło:
Teaching English with Technology; 2021, 21, 1; 131-143
1642-1027
Pojawia się w:
Teaching English with Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anterior approach for determination of sagittal spinopelvic parameters using anterior pelvic plane and sternum plane: a case study on symptom-free subjects
Autorzy:
Radło, Paweł
Danioł, Mateusz
Boehler, Lukas
Kozak, Josef
Powiązania:
https://bibliotekanauki.pl/articles/2063918.pdf
Data publikacji:
2020
Wydawca:
Międzynarodowe Stowarzyszenie na rzecz Robotyki Medycznej
Tematy:
USG nawigowane inteligentnie
przodopochylenie miednicy
staw biodrowy
zakres ruchu
chirurgia ortopedyczna wspomagana komputerowo
chirurgia robotyczna wspomagana komputerowo
smart navigated ultrasound
pelvic tilt in the anterior pelvic plane
hip-spine syndrome
range of motion
computer assisted orthopedic surgery
computer assisted robotic surgery
Opis:
Sagittal imbalance causes low back pain, hip impingement, and influences the whole skeleton and muscular system of our body. It is documented in the literature on spinal deformities that good long-term surgical results can only be achieved by restoring sagittal balance and spinopelvic harmony as part of surgical treatment. Currently, the state of the art in sagittal balance determination is based on conventional radiology or an EOS system both using X-ray radiation. These procedures are associated with radiation exposure for the patients. Therefore, a new anterior approach is shown in this work to measure sagittal balance with a navigated ultrasound system without any radiation exposure. The anterior pelvic plane and a newly defined sternum plane are considered to provide an assessment of the sagittal balance. This new approach was tested in a trial on 10 symptom-free subjects by using a smartphone navigated ultrasound system. The relationship between the rotation of the pelvis and the upper body inclination in young healthy people is examined in a standing position. The study with new determined landmarks (incisura jugularis, superior iliac spinas, and symphysis pubis) gives us significant different results between male and female test persons. A proposal for a classification of sagittal balance is achieved which defines a reasonable range for the Sternum Tilt of -0.1 ± 1.5° / 3.7 ± 2.5°. The significant advantage of this method is to evaluate the sagittal balance with a cost effective, smart system without any radiation exposure to the patient.
Źródło:
Medical Robotics Reports; 2020, 8/9; 20-26
2299-7407
Pojawia się w:
Medical Robotics Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gender differences in circulatory adjustment to head-up tilt test in health
Autorzy:
Rimi, S.A.
Rezwana, I.
Sultana, S.
Ferdousi, S.
Powiązania:
https://bibliotekanauki.pl/articles/2087921.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Opolski. Instytut Nauk o Zdrowiu
Tematy:
male
female
tilt test
SBP
DBP
Opis:
Background: A tilt table test is a useful, non-invasive technique that has been used for the last few decades to detect autonomic failure. The response to tilting may vary physiologically between sexes. Aim of the study: To assess the gender-specific changes in cardiovascular response to a tilt test in healthy subjects. Material and methods: This experimental study was conducted on 90 healthy males and females aged 18–60 years, from 2019 to 2020. Forty-five male subjects and 45 female subjects were included. Using a motorized tilt table, a tilt table test was performed at 60 degrees for 10 minutes. An automatic sphygmomanometer was used to measure blood pressure (BP), and heart rate (HR) and a pulse oximeter was used for the measurement of peripheral capillary oxygen saturation (SpO₂). An independent sample t test, a multiple regression analysis and a chi squared test were conducted for statistical analyses. Results: A significantly greater drop in systolic blood pressure (SBP) was observed in females, compared to males after tilting. In 5.5% of the subjects, orthostatic intolerance occurred, but there were no significant age or gender- specific differences in subjects with orthostatic intolerance. Conclusions: This study concluded that in response to tilting, cardiovascular response was less pronounced in females.
Źródło:
Medical Science Pulse; 2020, 14, 2; 10-14
2544-1558
2544-1620
Pojawia się w:
Medical Science Pulse
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal analysis of a gravity-assisted heat pipe working with zirconia-acetone nanofluids: An experimental assessment
Autorzy:
Abdolhossein Zadeh, Amin
Nakhjavani, Shima
Powiązania:
https://bibliotekanauki.pl/articles/240484.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat pipe
zirconia-acetone nanofluid
tilt angle
filling ratio
Opis:
An experimental investigation was performed on the thermal performance and heat transfer characteristics of acetone/zirconia nanofluid in a straight (rod) gravity-assisted heat pipe. The heat pipe was fabricated from copper with a diameter of 15 mm, evaporator-condenser length of 100 mm and adiabatic length of 50 mm. The zirconia-acetone nanofluid was prepared at 0.05–0.15% wt. Influence of heat flux applied to the evaporator, filling ratio, tilt angle and mass concentration of nanofluid on the heat transfer coefficient of heat pipe was investigated. Results showed that the use of nanofluid increases the heat transfer coefficient while decreasing the thermal resistance of the heat pipe. However, for the filling ratio and tilt angle values, the heat transfer coefficient initially increases with an increase in both. However, from a specific value, which was 0.65 for filling ratio and 60–65 deg for tilt angle, the heat transfer coefficient was suppressed. This was attributed to the limitation in the internal space of the heat pipe and also the accumulation of working fluid inside the bottom of the heat pipe due to the large tilt angle. Overall, zirconia-acetone showed a great potential to increase the thermal performance of the heat pipe.
Źródło:
Archives of Thermodynamics; 2020, 41, 2; 65-83
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tilt test of a pallet load unit – simulation studies
Autorzy:
Matyja, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/2091126.pdf
Data publikacji:
2020
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
tilt test
load unit
stability
simulation model
test pochyleniowy
jednostka ładunkowa
stabilność
model symulacyjny
Opis:
This paper presents a dynamic model of a palletised load unit during a static tilt test. The stability (also called rigidity) of a load unit was evaluated. The palletised load unit was built of packages forming layers and protected against disintegration by stretch film. The aim of this study was to compare the results of a static tilt test with a commonly used and recommended dynamic acceleration test.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2020, 107; 107--117
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advanced multi-engine platform (AMP™) – a way to robust RTK
Autorzy:
Averin, Sergey
Plenkin, Andrey
Ignatev, Pavel
Vorobiev, Michael
Veitsel, Andrey
Powiązania:
https://bibliotekanauki.pl/articles/320719.pdf
Data publikacji:
2019
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
RTK
heading
tilt
receiver frontend
receiver digital section
Opis:
The paper describes the Advanced Multi-Engine Platform (AMP™) – Topcon’s patent pending technique, which is capable to improve RTK performance, based on the idea of running several RTK engines in parallel. The performance of AMP™ is dependent on Topcon receiver board, where it has been implemented, and the best results are achieved with B210 board. The main specifics of B210 is that it has two RF front-ends and a single digital section. Such an architecture allows for calculating heading and tilt within a single receiver board, and providing better RTK performance due to synergy of attitude determination and RTK solutions from two antennas, calculated within a single digital section. The paper describes specifics of B210 board along with mathematical aspects of AMP™ and its logic. The test results demonstrate noticeable improvements in RTK performance for B210 receiver board with AMP™, compared with the classical single-engine RTK approach.
Źródło:
Annual of Navigation; 2019, 26; 12-20
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ sztywności budynku na jego wychylenie w warunkach eksploatacji górniczej
The influence of building structure rigidity on its deflection in the conditions of mining explitation
Autorzy:
Słowik, Leszek
Pitas, Michał
Powiązania:
https://bibliotekanauki.pl/articles/167444.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Górnictwa
Tematy:
eksploatacja górnicza
zabezpieczenia budynków
uszkodzenia budynków
budownictwo na terenach górniczych
analiza numeryczna
wychylenie budynku
mining exploitation
building protection
building damages
buildings on mining areas
numerical analysis
tilt of building
Opis:
Podziemna eksploatacja górnicza powoduje powstanie na powierzchni terenu niecki obniżeń, którą opisują wskaźniki deformacji terenu górniczego. Jednym ze wskaźników jest nachylenie profilu niecki górniczej T, które powoduje wychylenie obiektów budowlanych z pionu. Związane jest ono z uwarunkowaniami górniczo-geologicznymi, zmianami sztywności podłoża górniczego w warstwie przypowierzchniowej współpracującego z fundamentem budynku oraz czynnikami konstrukcyjnymi. W artykule omówiony został wpływ sztywności budynku o konstrukcji ścianowej na wychylenie jego ścian przy ukośnym usytuowaniu frontu robót górniczych względem osi podłużnej rzutu poziomego. Na bazie przeprowadzonych badań numerycznych modelu przestrzennego budynku poddanego obciążeniom programowym oraz wpływom wybranych wskaźników deformacji górniczych podane zostały wyniki, ich interpretacja oraz wnioski, które skorelowane zostały z obserwacjami zawartymi w innych, archiwalnych pracach Instytutu Techniki Budowlanej.
Underground mining exploitation causes depression on the surface of the basin, which is described by the deformation indices of the mining area. One of the indicators is the inclination of the mining trough profile T, which causes the construction objects to be tilted from the vertical. It is connected with the mining and geological conditions, changes in the rigidity of the mining substrate in the surface layer co-operating with the foundation of the building and structural factors. This paper discusses the influence of stiffness of a building with a longwall structure on the deflection of its walls at the diagonal location of the mining works front in relation to the longitudinal axis of the horizontal projection. The results, their interpretation and conclusions were presented on the basis of numerical studies of the spatial model of a building subject to program loads and the impact of the selected mining deformation indices. The results obtained were compared with the observations contained in other archival works of the Building Research Institute.
Źródło:
Przegląd Górniczy; 2019, 75, 2; 35-41
0033-216X
Pojawia się w:
Przegląd Górniczy
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 33

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