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Tytuł:
Design and analysis of a novel concept-based unmanned aerial vehicle with ground traversing capability
Autorzy:
Kumar, Ramanuj
Gour, Surjeet S.
Pandey, Anish
Kumar, Shrestha
Mohan, Abhijeet
Shashwat, Pratik
Sahoo, Ashok K.
Powiązania:
https://bibliotekanauki.pl/articles/2105984.pdf
Data publikacji:
2022
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
unmanned aerial vehicle
unmanned ground vehicle
rough terrain
quadcopter
caterpillar wheel
kinematic analysis
Opis:
Unmanned aerial vehicle (UAV) is a typical aircraft that is operated remotely by a human operator or autonomously by an on-board microcontroller. The UAV typically carries offensive ordnance, target designators, sensors or electronic transmitters designed for one or more applications. Such application can be in the field of defence surveillance, border patrol, search, bomb disposals, logistics and so forth. These UAVs are also being used in some other areas, such as medical purposes including for medicine delivery, rescue operations, agricultural applications and so on. However, these UAVs can only fly in the sky, and they cannot travel on the ground for other applications. Therefore, in this paper, we design and present the novel concept-based UAV, which can also travel on the ground and rough terrain as an unmanned ground vehicle (UGV). This means that according to our requirement, we can use this as a quadcopter and caterpillar wheel–based UGV using a single remote control unit. Further, the current study also briefly discusses the two-dimensional (2D) and three-dimensional (3D) SolidWorks models of the novel concept-based combined vehicle (UAV + UGV), together with a physical model of a combined vehicle (UAV + UGV) and its various components. Moreover, the kinematic analysis of a combined vehicle (UAV + UGV) has been studied, and the motion controlling kinematic equations have been derived. Then, the real-time aerial and ground motions and orientations and control-based experimental results of a combined vehicle (UAV + UGV) are presented to demonstrate the robustness and effectiveness of the proposed vehicle.
Źródło:
Acta Mechanica et Automatica; 2022, 16, 3; 169--179
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative analysis of unmanned aerial vehicles used in photogrammetric surveys
Autorzy:
Specht, M.
Widźgowski, S.
Stateczny, A.
Specht, C.
Lewicka, O.
Powiązania:
https://bibliotekanauki.pl/articles/24201468.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
unmanned aerial vehicle
unmanned vehicles
photogrammetry
drone
inertial navigation system
hydrography
Global Navigation Satellite System
LiDAR
Opis:
There are many manufacturers on the market offering various types of Unmanned Aerial Vehicles (UAV). The multitude of drones available on the market means that the choice of a UAV for a specific application appears to be a decision problem to be solved. The aim of this article is a comparative analysis of drones used in photogrammetric surveys. The criteria for evaluating the UAVs were: availability and product support, payload (min. 5 kg), price (PLN 100,000), as well as space available for measurement modules. These are the requirements that must be met for the implementation of the INNOBAT project, the aim of which is to develop an integrated system using autonomous unmanned aerial and surface vehicles, intended for bathymetric monitoring in the coastal zone. The comparative analysis of drones was based on 27 companies producing UAV. Based on the analysis, 6 drones that met the project requirements were selected. They were: Aurelia X6 Pro, Aurelia X8 Standard LE, DroneHexa AG, FOX-C8 XT, Hercules 10 and Zoe X4. Selected UAVs differ from each other, among others, in the number of rotors, flight duration and resistance to weather conditions. Individual characteristics of drones may have a different rank depending on their application, therefore the selection of UAVs should be made after prioritisation criteria of a given project.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 2; 433--443
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza przenośnych systemów do przechwytywania miniaturowych bezzałogowych statków powietrznych
Analysis of man-portable systems intercepting miniature unmanned aerial vehicles
Autorzy:
Leśnik, G.
Płatek, P.
Szmit, Ł.
Czyżewska, M.
Grązka, M.
Michalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/234774.pdf
Data publikacji:
2017
Wydawca:
Wojskowy Instytut Techniczny Uzbrojenia
Tematy:
bezzałogowy statek powietrzny
dron
przechwytywanie bezzałogowych statków powietrznych
unmanned aerial vehicle
drone
capturing the unmanned aerial vehicles
Opis:
Ostatnio obserwuje się wielki postęp technologiczny w dziedzinie bezzałogowych statków powietrznych (BSP), zazwyczaj nazywanych dronami oraz powszechne ich wykorzystanie w zastosowaniach militarnych i cywilnych. To powoduje potrzebę poszukiwania nowych sposobów reagowania m.in. na: naruszanie przestrzeni powietrznej w bezpośredniej bliskości lotnisk, naruszanie stref obiektów o strategicznym znaczeniu dla bezpieczeństwa państwa oraz zakłócania imprez masowych. Zagrożenie stanowią drony wykorzystywane do przemytu różnorodnych substancji m.in. w rejonach nadgranicznych i w zakładach karnych. W artykule przedstawiono wyniki analizy rozwiązań konstrukcyjnych systemów do przechwytywania miniaturowych bezzałogowych statków powietrznych, oceniono dotychczas wykorzystywane metody i wskazano najbardziej perspektywiczne kierunki rozwoju systemów neutralizacji dronów.
A huge improvement in technology of unmanned aerial vehicles (UAVs), usually called drones, and their wide both civilian and military use has been observed recently. For it new countermeasures are undertaken to prevent air space violation in the vicinity of airports, critical infrastructure and mass events. Drones used to smuggle substances through the borders and to the penitentiaries are another threat. This paper presents the state of art in the systems dedicated to capture the miniature UAVs, and evaluates the methods used up to now, and points out the most perspective directions for drones’ neutralization systems.
Źródło:
Problemy Techniki Uzbrojenia; 2017, 46, 142; 87-101
1230-3801
Pojawia się w:
Problemy Techniki Uzbrojenia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie bezzałogowych statków powietrznych w kryminalistyce rozpoznawczej i wykrywczej
Risk estimation and risk evaluation on examination flight Unmanned Aerial Vehicle Operator on Visual Line of Sight
Autorzy:
Merkisz, J.
Nykaza, A.
Powiązania:
https://bibliotekanauki.pl/articles/310550.pdf
Data publikacji:
2016
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
bezzałogowy statek powietrzny
dron
lotnictwo bezzałogowe
kryminalistyka rozpoznawcza
kryminalistyka wykrywcza
unmanned aircraft
drone
unmanned aerial vehicle
forensics
Opis:
Z analiz policyjnych statystyk w Polsce co raku dochodzi do około 20 tysięcy zaginięć i niestety liczba ta, z roku na rok, ciągle wzrasta. Bezzałogowy statek powietrzny (BSP) może być pomocny w prowadzeniu poszukiwań oraz oględzin miejsc zbrodni. Dodatkową zaletą zastosowania BSP w tego typu akcjach jest możliwość wykonania, potrzebnej w dalszych działaniach, dokumentacji fotograficznej miejsc, gdzie zaistniało dane zdarzenie. Poprzez wszechstronne zastosowanie BSP możliwe będzie w przyszłości zdecydowanie szybsze i bardziej precyzyjne rozwiązywanie spraw kryminalnych. Wzrost udziału bezzałogowych statków powietrznych w działaniach służb umożliwi także wzrost poziomu bezpieczeństwa w danym państwie.
From the analysis of police statistics in Poland every year there are about 20,000 missing. Unfortunately this number from year to year, is still increasing. Unmanned aerial vehicle (UAV) may be helpful in conducting search and inspection of crime scenes. An additional advantage of using BSP in such campaigns is the ability to perform, photographic documentation of the places where the event occurred. Through extensive use of unmanned aircraft in the future it will be possible much faster and more accurate resolution of criminal cases. The increase in the share of unmanned aircraft in service activities also enables an increase in the level of security in the country.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2016, 17, 6; 297-301
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary study of an airplane for electric propulsion testing at high altitudes
Autorzy:
Galinski, C.
Powiązania:
https://bibliotekanauki.pl/articles/246733.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
electric propulsion
flight testing
unmanned aerial vehicle
Opis:
Technology of photovoltaic cells and lithium batteries is being developed rapidly. As a result, attempts to build solar High Altitude Long Endurance (HALE) airplanes are more and more frequent. In the future, such airplanes may appear very useful for the economy because they may replace geostationary satellites in several applications. Unfortunately, data on altitude effect on photovoltaic cells and batteries performance are not easily available. Moreover, acquisition cost of cells is very high. Therefore, a tool for inexpensive testing of cells is needed. This article shows a study of very light unmanned airplane that could be used as a testbed for this purpose. Weight assumptions are presented together with concept of geometry and aerodynamic characteristics. Propulsion system is proposed, so also airplane performance is estimated. Finally, results are discussed leading to the conclusion. It appears that unmanned airplane with maximum take-off weight of 1.3 kg can climb to the altitude of 10 km within 4 hours during sunny summer day about the noon. However, only 30% of such days can be used because of strong winds blowing at high altitudes, quite small optimal airspeed of the airplane and constraints due to Air Traffic Management. Moreover, application of variable pitch propeller is recommended as well as some kind of take-off assist. For example, towing or take-off from the hill is desirable to avoid threats resulting from small climb rate.
Źródło:
Journal of KONES; 2018, 25, 3; 167-174
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Quality of Unmanned Aerial Vehicles: Ergodesign Aspect. Part 2
Autorzy:
Kharchenko, Volodymyr
Rubtsov, Anatolii
Svirko, Volodymyr
Zhudova, Iryna
Powiązania:
https://bibliotekanauki.pl/articles/2056522.pdf
Data publikacji:
2022-06-07
Wydawca:
Międzynarodowa Wyższa Szkoła Logistyki i Transportu
Tematy:
unmanned aerial vehicle
ergodesign aspect
aerial systems
Opis:
In the modern world, scientific and practical ergodesign activity on the development and use of drones, the concept of "human factor" is becoming more and more important. It is one of the main studies in improving the safety, efficiency and comfort of the "man - unmanned aerial vehicle" system operation. The most promising research is aimed at the application and development of new approaches to the evaluation of algorithms for unmanned aircraft maintenance and the organization of their operators` activities. The system of unmanned aerial vehicles ergodesign quality indicators developed and presented in a tabular form reflects practically all design and ergonomic properties of modern unmanned aerial systems. It is based on the existing normative documentation inUkrainedeveloped by the authors, harmonized with international and European standards. It allows the analysis and evaluation of unmanned aerial vehicles in order to take into account consumer interests at the beginning of their design reducing the assimilation time of products and preventing irrational production costs. The results of such an analysis underlie the development of technical documentation, standards, and specifications. They should be taken into account when putting products into production.
Źródło:
Logistics and Transport; 2022, 53-54, 1-2; 133-160
1734-2015
Pojawia się w:
Logistics and Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Centralized Spectrum Sharing and Coordination Between Terrestrial and Aerial Base Stations of 3GPP-Based 5G Networks
Autorzy:
Bechta, Kamil
Powiązania:
https://bibliotekanauki.pl/articles/1844695.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
5G
spectrum sharing
unmanned aerial vehicle
Opis:
The objective of this paper is to estimate performance of a new approach for spectrum sharing and coordination between terrestrial base stations (BS) and On-board radio access nodes (UxNB) carried by Unmanned Aerial Vehicles (UAV). This approach employs an artificial intelligence (AI) based algorithm implemented in a centralized controller. According to the assessment based on the latest specifications of 3rd Generation Partnership Project (3GPP) the newly defined Unmanned Aerial System Traffic Management (UTM) is feasible to implement and utilize an algorithm for dynamic and efficient distribution of available radio resources between all radio nodes involved in process of optimization. An example of proprietary algorithm has been described, which is based on the principles of Kohonen neural networks. The algorithm has been used in simulation scenario to illustrate the performance of the novel approach of centralized radio channels allocation between terrestrial BSs and UxNBs deployed in 3GPP-defined rural macro (RMa) environment. Simulation results indicate that at least 85% of simulated downlink (DL) transmissions are gaining additional channel bandwidth if presented algorithm is used for spectrum distribution between terrestrial BSs and UxNBs instead of baseline soft frequency re-use (SFR) approach.
Źródło:
International Journal of Electronics and Telecommunications; 2021, 67, 2; 301-308
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quality of unmanned aerial vehicles: ergodesign aspect
Autorzy:
Kharchenko, Volodymyr
Rubtsov, Anatolii
Svirko, Volodymyr
Zhudova, Iryna
Powiązania:
https://bibliotekanauki.pl/articles/1961878.pdf
Data publikacji:
2021-12-30
Wydawca:
Międzynarodowa Wyższa Szkoła Logistyki i Transportu
Tematy:
unmanned aerial vehicle
ergodesign quality indicators
unmanned aircraft maintenance
operator activities
operational indicators
environmental awareness
versatility of UAV
Opis:
In the modern world, scientific and practical ergodesign activity on the development and use of drones, the concept of "human factor" is becoming more and more important. It is one of the main studies in improving the safety, efficiency and comfort of the "man - unmanned aerial vehicle" system operation. The most promising research is aimed at the application and development of new approaches to the evaluation of algorithms for unmanned aircraft maintenanceand the organization of their operators` activities. The system of unmanned aerial vehicles ergodesign quality indicators developed and presented in a tabular form reflects practically all design and ergonomic properties of modern unmanned aerial systems. It is based on the existing normative documentation in Ukraine developed by the authors, harmonized with international and European standards. It allows the analysis and evaluation of unmanned aerial vehicles in order to take into account consumer interests at the beginning of their design reducing the assimilation time of products and preventing irrational production costs. The results of such an analysis underlie the development of technical documentation, standards, and specifications. They should be taken into account when putting products into production.
Źródło:
Logistics and Transport; 2021, 51-52, 3-4; 35-78
1734-2015
Pojawia się w:
Logistics and Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optymalizacja toru nadawczo-odbiorczego wysokościomierza laserowego dla układu BSP
Optimization of laser altimeter for unmanned aerial vehicle
Autorzy:
Wojtanowski, J.
Zygmunt, M.
Mierczyk, Z.
Powiązania:
https://bibliotekanauki.pl/articles/208494.pdf
Data publikacji:
2009
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
wysokościomierz laserowy
dalmierz laserowy
BSP
technika laserowa
laser altimeter
rangefinder
unmanned aerial vehicle
unmanned aircraft system
laser technology
Opis:
W artykule opisano charakterystyki zasięgowe układu dalmierza laserowego z uwzględnieniem właściwości transmisyjnych atmosfery jako ośrodka propagacji fal elektromagnetycznych. Wnioski z ich analizy umożliwiły optymalizację układu pomiaru wysokości w systemie Bezzałogowego Statku Powietrznego (BSP). W procesie optymalizacji zweryfikowano dobór parametrów laserowej wiązki roboczej oraz dobór parametrów konstrukcyjnych urządzenia. Uwzględniono także właściwości rzeczywistego układu wysokościomierza przy zastosowaniu wybranych fotodiod lawinowych w torze odbiorczym. Na podstawie ich parametrów szumowych, wyznaczono wartości maksymalnych zasięgów pracy wysokościomierza. Przeprowadzona optymalizacja uwzględnia wymagania normy PN-EN 60825-1 dotyczącej zastosowań promieniowania laserowego w zakresie bezpiecznym dla oka ludzkiego.
The analysis of the laser altimeter main characteristics has been developed, including the influence of atmospheric propagation properties. The analysis allowed us to perform the optimization procedure with respect to device application on unmanned aircraft system. The optimization process covered both laser beam characteristics and major structural parameters of the altimeter. The application of real avalanche photodiodes and their noise characteristics were taken into consideration in all the calculations, thus enabling to evaluate the maximum working altitudes of the device and to compare the photodetectors themselves. The PN-EN 60825-1 safety standard was respected in all the estimations to satisfy the requirements of the eye-safe laser technique.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2009, 58, 1; 141-152
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Certification of Unmanned Aircraft (UA)
Autorzy:
Pettke, G.
Kozyro, W.
Gałka, P.
Trzeciak, G.
Wołejsza, P.
Powiązania:
https://bibliotekanauki.pl/articles/1841555.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
unmanned vehicles
Polish Register of Shipping
PRS
Unmanned Aircraft
unmanned aerial vehicle
remotely piloted aircraft systems
ground control station
object’s recognition and classification awareness
vertical take-off and landing
Opis:
PRS (Polish Register of Shipping) is an expert institution acting on the international market, that - by conducting business for the benefit of the community - through the formulation of the requirements, survey and issue of the appropriate documents, assists State Administrations, Underwriters and customers in ensuring the safety of people, floating objects, land undertakings, carried cargo and the natural environment. PRS is a body accredited for certification of management systems, as well as a notified body in the European Commission for conducting product conformity assessment procedures with EU directives and regulations, and certify of personnel and processes. Subject and scope of the Publication The Publication defines requirements and procedures of conformity assessment process of Unmanned Aircraft (UA) and the technical possibilities of their use in the maritime economy segment. Purpose of the publication: Defining technical and formal requirements for design, construction and operation of the Unmanned Aircraft (UA), Determining the scope and methodology of conformity assessment process of Unmanned Aircraft (UA), Determining the technical possibilities of using Unmanned Aircraft (UA) in the maritime economy segment. The publication includes the following issues: basic principles and design requirements as well as technical regulations that ensure the design of the Unmanned Aircraft (UA), as a safe product in operation; the scope and methodology of conformity assessment of Unmanned Aircraft (UA); principles and scope of technical supervision over the Unmanned Aircraft (UA), requirements set by PRS in using Unmanned Aircraft (UA) on sea-going ships. The conclusions of the paper: indication of the way to obtain BSP certification, the basis for launching the procedure for developing the NO defence standard for the certification of ships and naval auxiliary units for cooperation with Unmanned Aircraft (UA).
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2021, 15, 1; 143-155
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bezzałogowe statki powietrzne – geneza, teraźniejszość i przyszłość
Unmanned aerial vehicles – genesis, present and future
Autorzy:
Bukowski, P.
Szala, G.
Powiązania:
https://bibliotekanauki.pl/articles/95416.pdf
Data publikacji:
2018
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydawnictwo PB
Tematy:
dron
bezzałogowy statek powietrzny
drone
unmanned aerial vehicle
Opis:
W pracy przedstawiono historię oraz zastosowanie bezzałogowych statków powietrznych, pobudki jakimi kierowali się konstruktorzy i wynalazcy oraz mniej lub bardziej udane wyniki ich poczynań. Opracowanie zawiera zarówno pierwsze projekty, często nieudane, jak i konstrukcje, które wznosiły się w powietrze. Przedstawiono również najnowsze konstrukcje militarne wyposażone w zaawansowane systemy nawigacyjne i bojowe z pełnym sukcesem wykonujące zadane misje. Kierunki rozwoju platform oraz podstystemów BSP zamykają całość publikacji.
This elaboration shortly presents the use and history of unmanned aerial vehicles, the motivations of designers and inventors, and the more or less successful results of their actions. The study contains both the first projects, often unsuccessful, and structures that got up into the sky. The whole study is closed by the latest military constructions equipped with advanced navigational and combat systems which perform assigned missions successfully. The development directions of UAV platforms and sub-systems close the entire publication.
Źródło:
Postępy w Inżynierii Mechanicznej; 2018, 11(6); 5-19
2300-3383
Pojawia się w:
Postępy w Inżynierii Mechanicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wojskowe samoloty bezzałogowe
Military unmanned aerial vehicles
Autorzy:
Zarzycki, B.
Powiązania:
https://bibliotekanauki.pl/articles/235268.pdf
Data publikacji:
2012
Wydawca:
Wojskowy Instytut Techniczny Uzbrojenia
Tematy:
uzbrojenie
bezzałogowiec
samolot
weaponry
unmanned aerial vehicle
UAV
plane
Opis:
W artykule zaprezentowano typowe konstrukcje samolotów bezzałogowych, które używane są przede wszystkim w misjach rozpoznawczych a także do niszczenia wojskowych obiektów.
In the paper the typical unmanned aerial vehicles (UAV) used to monitor and for surveillance were presented. There also exist some solutions that allow to attack and destroy military targets.
Źródło:
Problemy Techniki Uzbrojenia; 2012, 41, 124; 23-30
1230-3801
Pojawia się w:
Problemy Techniki Uzbrojenia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of small uav position and attitude with reliable in-flight initial alignment for MEMS inertial sensors
Autorzy:
Wang, D.
Dong, Y.
Li, Q.
Wu, J.
Wen, Y.
Powiązania:
https://bibliotekanauki.pl/articles/221716.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
MEMS
INS
GNSS
in-flight alignment
unmanned aerial vehicle
Opis:
The advance of MEMS-based inertial sensors successfully expands their applications to small unmanned aerial vehicles (UAV), thus resulting in the challenge of reliable and accurate in-flight alignment for air-borne MEMS-based inertial navigation system (INS). In order to strengthen the rapid response capability for UAVs, this paper proposes a robust in-flight alignment scheme for airborne MEMS-INS aided by global navigation satellite system (GNSS). Aggravated by noisy MEMS sensors and complicated flight dynamics, a rotation-vector-based attitude determination method is devised to tackle the in-flight coarse alignment problem, and the technique of innovation-based robust Kalman filtering is used to handle the adverse impacts of measurement outliers in GNSS solutions. The results of flight test have indicated that the proposed alignment approach can accomplish accurate and reliable in-flight alignment in cases of measurement outliers, which has a significant performance improvement compared with its traditional counterparts.
Źródło:
Metrology and Measurement Systems; 2018, 25, 3; 603-616
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The analysis of working liquid flow in a hydrostatic line with the use of frequency characteristics
Autorzy:
Ułanowicz, L.
Jastrzębski, G.
Powiązania:
https://bibliotekanauki.pl/articles/200309.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aviation
unmanned aerial vehicle
hydrostatic drive
servomechanism
hydrostatic line
Opis:
One of the little described problems in hydrostatic drives is the fast changing runs in the hydraulic line of this drive affecting the nature of the formation and intensity of pressure pulsation and flow rate occurring in the drive. Pressure pulsation and flow rate are the cause ofthe unstable operation of servos, delays in the control system and other harmful phenomena. The article presents a flow model in a hydrostatic drive line based on fluid continuity equations (mass conservation), maintaining the amount of Navier-Stokes motion in the direction of flow (x axis), energy conservation (liquid state). The movement of liquids in a hydrostatic line is described by partial differential equations of the hyperbolic type, so modeling takes into account the wave phenomena occurring in the line. The in hydrostatic line was treated as a cross with two inputs and two outputs, characterized by a specific transmittance matrix. The product approximation was used to solve the wave equations. An example of the use of general equations is presented for the analysis of a miniaturized hydrostatic drive line fed from a constant pressure source and terminated by a servo mechanism.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 4; 949-956
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of drones in the maritime sector – areas and benefits
Autorzy:
Krystosik-Gromadzińska, Agata
Powiązania:
https://bibliotekanauki.pl/articles/2033624.pdf
Data publikacji:
2021
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
ship
drone
unmanned aerial vehicle
safety
security
maritime sector
Opis:
Drones are entering the maritime sector and have successfully increased safety and security. They can effectively replace humans, and where life and health are at risk during operations such as tank or hull inspections, they can be used in a fully remote capacity. They are used to transport spare parts, documents, medicine, etc. between land and ships at sea or on the roadstead, which may increase safety during the COVID-19 pandemic. Drones can control traffic and the emission of pollutants from ships, detect pirates, monitor areas, and support operations. They are used in search and rescue missions and also provide modern technologies like 5G and others. Drones are reliable and effective, and their use minimizes costs and reduces time. This paper presents a current review of the state of knowledge on the use of drones in the maritime sector. It takes into consideration the opportunities of their utilisation and presents possibilities and examples of successful drone exploitation by various entities such as classification societies, shipyards, search and rescue (SAR) missions, and others. The benefits and limitations and a roadmap for drones in shipping are also analysed. An application forecast for the Polish maritime sector in the West Pomeranian and Pomeranian Regions is also delivered in the paper. Desk research methodology was used to review the literature to identify the set goals by analysing literature reports, articles, and materials published by beneficiaries using drones successfully, as well as inquiries and market offers.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2021, 67 (139); 16-25
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 112

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