Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "air vehicle" wg kryterium: Temat


Tytuł:
Studies and tests of micro aerial vehicle during flight
Autorzy:
Kowalski, M.
Zyluk, A.
Sibilski, K.
Powiązania:
https://bibliotekanauki.pl/articles/245658.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
Micro Air Vehicle
flight tests
Opis:
The article presents the results of flight tests of an unmanned flying device based on a model Micro Air Vehicle (MAV). The airplane was used during experimental studies. In the article, on-board equipment of micro-plane used in the study has been shown. Furthermore, the process of integrating all of the avionics equipment with MAV has been described. During the flight test, all parameters of microaircraft flight such as air and cruising speeds, altitude, air route, angles of tilt, slope angle, deviation angle, tilting speed, slope speed, deviation speed, etc. were recorded. During the study, the behaviour of micro-aircraft in various phases of flight such as autonomous take off, landing, programmable flight to the specific points of the air route was checked. In addition, the action of specified fail safe features of micro airplane operating in the case of a failure (e.g. in the case of low voltage of power package, loss of GPS signal, loss of communication with the ground station, etc.) is determined. The graphs of some flight parameters and figures of flight routes as well as flight profiles during the programmable flight have been presented. The researches allow for the verification of the integration process of micro-aircraft with on-board systems and they also allow for evaluation of its functional characteristics in further studies such as formation flights and bypassing the obstacles.
Źródło:
Journal of KONES; 2015, 22, 4; 155-162
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improvement of helicopter performance using self - supplying air jet vortex generators
Autorzy:
Krzysiak, A.
Powiązania:
https://bibliotekanauki.pl/articles/244313.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
air vehicle
helicopter
applied aerodynamics
vortex generation
Opis:
The work presents the results of experimental wind tunnel tests of using self-supplying air jet vortex generators to delay dynamic stall on helicopter blade due to attain high angles of attack. The dynamic stall which may appear on retreating helicopter blade is considered as the most severe type of stall, characterized by a strong vortex that forms on the blade’s upper surface. Its appearance is a significant limitation of helicopter performance. To improve helicopter aerodynamic characteristics the using of self-supplying air jet vortex generators was proposed. In comparison with the conventional air-jet vortex generators, which are supplied with the air from an external compressor, the self-supplying generators receive air from the overpressure region situated in the nose part of the blade lower surface at the higher angles of attack. The paper presents a comparison of the effectiveness of both types of generators based on tests performed in low speed wind tunnel T-1 in the Institute of Aviation (IoA) in the range of Mach numbers M =0.05-0.1. The experimental tests modeling periodic changes of flow around helicopter blade airfoil equipped with proposed self-supplying air jet vortex generators were performed in tri-sonic wind tunnel N-3 (with 0.6 x 0.6 m test section) in the IoA for Mach numbers M = 0.2 and 0.3. The NACA 0012 airfoil model of 0.18 m chord length used in wind tunnel test was oscillating in pitch ( alfa = ±50 with frequency 5 Hz) about an axis located at 35% chord length from the airfoil leading edge.
Źródło:
Journal of KONES; 2013, 20, 2; 229-236
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of C-Means clustering based adaptive fuzzy controller for a flapping wing micro air vehicle
Autorzy:
Ferdaus, Md Meftahul
Anavatti, Sreenatha G.
Garratt, Matthew A.
Pratama, Mahardhika
Powiązania:
https://bibliotekanauki.pl/articles/91692.pdf
Data publikacji:
2019
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
adaptive fuzzy
clustering
flapping wing
micro air vehicle
Opis:
Advanced and accurate modelling of a Flapping Wing Micro Air Vehicle (FW MAV) and its control is one of the recent research topics related to the field of autonomous MAVs. Some desiring features of the FW MAV are quick flight, vertical take-off and landing, hovering, and fast turn, and enhanced manoeuvrability contrasted with similar-sized fixed and rotary wing MAVs. Inspired by the FW MAV’s advanced features, a four-wing Natureinspired (NI) FW MAV is modelled and controlled in this work. The Fuzzy C-Means (FCM) clustering algorithm is utilized to construct the data-driven NIFW MAV model. Being model free, it does not depend on the system dynamics and can incorporate various uncertainties like sensor error, wind gust etc. Furthermore, a Takagi-Sugeno (T-S) fuzzy structure based adaptive fuzzy controller is proposed. The proposed adaptive controller can tune its antecedent and consequent parameters using FCM clustering technique. This controller is employed to control the altitude of the NIFW MAV, and compared with a standalone Proportional Integral Derivative (PID) controller, and a Sliding Mode Control (SMC) theory based advanced controller. Parameter adaptation of the proposed controller helps to outperform it static PID counterpart. Performance of our controller is also comparable with its advanced and complex counterpart namely SMC-Fuzzy controller.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2019, 9, 2; 99-109
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A conception of vertical take-off air vehicle with self-aligning moving wings
Autorzy:
Lichoń, D.
Powiązania:
https://bibliotekanauki.pl/articles/242818.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
vertical take-off
air vehicle conception
self-aligning wings
flapping wings
Opis:
The possibility of vertical take-off of an aircraft is a valuable feature in air transport. It allows to increase operational characteristics of an air vehicle and requires less field and low cost ground infrastructure. Currently the vertical take-off feature is practically reserved to helicopters and tilt-rotor aircrafts. Both types of air vehicles have their advantages and also have some important limitations. Regarding the helicopters their construction provides natural vertical take-off features and makes them useful in low altitude flight tasks. However the power required for flight and main rotor kinematics results in low cruising speed and short range performance. The tilt-rotor aircraft is an answer which provides good cruise characteristics saving the vertical take-off feature. The construction of tiltrotor aircraft consists of rotors with adjustable position of tip-path plane. The main technical problem of tilt-rotors is necessity of change aerodynamic configuration from vertical mode to cruise mode at low flight altitude and very low flight speed. A proposed conception of a vertical take-off air vehicle using self-aligning moving wings is focused on producing aerodynamic force always on wings without participation of rotors or propellers. The self-aligning or semirotating wing movement enables to produce aerodynamic force in each flight speed. During take-off lift force is generated by means of power unit driving the wings. The transition from hovering to progressive flight is a smooth phase without aerodynamic configuration changes. It occur as a result of change in wing kinematics or gravity center position. As the flight speed increases the lift force is generated like in classic airplane wing and the power unit load decreases. The conception of presented air vehicle assume to join best features of airplanes and helicopters i.e. vertical take-off, good flight performances and lack of strict border between both phases of flight.
Źródło:
Journal of KONES; 2014, 21, 4; 311-317
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pokładowy system rejestracji PSR-04E
On-board data acquisition system PSR-04E
Autorzy:
Grzybowski, J.
Rogalski, T.
Rzucidło, P.
Powiązania:
https://bibliotekanauki.pl/articles/328525.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
rejestrator
akwizycja danych
bezzałogowy aparat latający
CAN
recorder
data acquisition
unmanned air vehicle
Opis:
W pracy przedstawiono koncepcję oraz praktyczną realizację pokładowego system rejestracji PSR-04E. System składa się z miniaturowego układu akwizycji danych i sieci modułów pomiarowych. Opracowany prototyp pozwala na konfigurację rejestratora do współpracy również z typowymi urządzeniami stosowanymi w awionice. Rejestrator posiada otwartą architekturę i umożliwia przyłączanie nowych urządzeń bez zmian w strukturze systemu rejestracji. Małe wymiary, wydajność, szybkość oraz możliwość rozproszonej zabudowy predysponują system zarówno do badań bezzałogowych aparatów latających jak również lekkich samolotów ogólnego przeznaczenia.
This paper presents conception and practical realization of on-board data recording system PSR-04E. The system consists of miniaturized data acquisition unit and network of measurement units. Developed prototype enables configuration of recorder for operation with standard avionics devices. The architecture of recorder is open and enables connection of new devices without any changes in global structure of system. Small dimensions, high performance and possibility of scattered installation of particular modules make application of PSR-04E on board of unmanned air vehicles as well as general aviation aircraft possible.
Źródło:
Diagnostyka; 2007, 1(41); 75-80
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Systemy bezzałogowych statków powietrznych
Unamanned aerial systems
Autorzy:
Cwojdziński, L.
Powiązania:
https://bibliotekanauki.pl/articles/254266.pdf
Data publikacji:
2012
Wydawca:
Instytut Naukowo-Wydawniczy TTS
Tematy:
statki powietrzne
systemy bezzałogowe
BSSP
BSP
air vehicle
Unmanned Aerial Systems
UAS
UAV
Opis:
Bezzałogowe systemy statków powietrznych (BSSP) są to systemy składające się z operacyjnych stacji naziemnych oraz bezzałogowych statków powietrznych (BSP). Tego rodzaju bezzałogowe systemy (w zastosowaniach militarnych) mogą podejmować różne zadania bojowe, a w tym zadania rozpoznania i bezpośredniego wsparcia lotniczego. BSP są pilotowane (sterowane) ze stanowiska na ziemi i zwykle potrzebują naziemnego składu osobowego do sterowania, montażu, obsługi platformy i systemów, takich jak np. sensory, które statek powietrzny przenosi. Dla długotrwałych zadań bojowych (z przenoszeniem uzbrojenia), w których bezzałogowe statki powietrzne są poza bezpośrednim łączem kontrolerów, konieczne są pośrednie przekaźniki łączności, zwykle w formie satelitów. BSP odznaczają się doskonałą zwrotnością, która w pewnych okolicznościach bojowych jest szczególnie przydatna. W konsekwencji, ekstremalna zwrotność jest cechą, która może zostać włączona do przyszłych generacji bezzałogowych samolotów uderzeniowych lub bezzałogowych myśliwców.
Unmanned Aerial Systems (UAS) consist of the ground operator station and unmanned air vehicle (UAV). Such the systems when used for military purposes can undertake some different combat tasks including identification of targets and the close air support, as well. UAVs are controlled by operator from the ground station and therefore some ground personnel: control, assembling and maintenance of the platform and on board systems staff members is necessary. For a long term combat task (including the armament carrying) when the UAV is out of direct ground control area some intermediate communication relay is needed, usually in form of satellites. UAVs are of extremely high maneuverability, especially useful within the certain combat circumstances. Consequently such the maneuverability can be considered as one of the most important property of the new generation of unmanned combat aircraft, including fighters.
Źródło:
TTS Technika Transportu Szynowego; 2012, 9; 453-462, CD
1232-3829
2543-5728
Pojawia się w:
TTS Technika Transportu Szynowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SAN : an Integrated Unmanned Air Vehicles Interdictor System Concept
Koncepcja Zintegrowanego Systemu Antydronowego : SAN
Autorzy:
Król, M.
Koperski, W.
Błaszczyk, J.
Woźniak, R.
Błaszczyk, P. M.
Powiązania:
https://bibliotekanauki.pl/articles/403783.pdf
Data publikacji:
2017
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
unmanned air vehicle systems
drone
antiterrorist security
air defence
bezzałogowe systemy latające
dron
ochrona antyterrorystyczna
obrona powietrzna
Opis:
The development of unmanned air vehicles (UAVs) has been very rapid recently. The wide accessibility of UAVs has unlocked a great potential for the malicious or accidental damage or destruction of property or other aircraft in flight. UAVs can be used for espionage, contraband, and the trafficking or transport of arms and hazardous materials. Every month sees a growing number of reports of incidents that involve remote-controlled UAVs operated for aerial video recording. These incidents justify undertaking research into minimizing the hazards which UAVs may potentially cause. A concept was developed for a solution dedicated to this problem and comprising an integrated modular anti-UAV system for application in commercial (civilian) markets in the areas of security of mass events, strategic enterprises, and critical strategic infrastructure in Poland. The proposed system is intended to incapacitate any UAVs that breach a predefined air space and bring the incapacitated UAVs safely to the ground. The project is developed jointly by the Institute of Armament Technology at the Military University of Technology (Warsaw, Poland) and Polish company Ellipsis Sp. z o.o.
W ostatnich latach można zaobserwować szybki rozwój technologiczny bezzałogowych statków latających. Szeroki dostęp do bezzałogowych statków powietrznych (BSP) otwiera drogę do nadużyć spowodowanych ich umyślnym lub niezamierzonym użyciem w celu doprowadzenia do uszkodzenia lub zniszczenia innych statków powietrznych, innego mienia. BSP mogą być wykorzystywane do szpiegostwa, przemytu, przenoszenia broni i substancji niebezpiecznych. Z miesiąca na miesiąc wzrasta liczba doniesień odnośnie incydentów z udziałem głównie modeli zdalnie sterowanych wykorzystywanych do filmowania z powietrza. Uzasadnia to podjęcie prac zmierzających do zminimalizowania zagrożeń, jakie mogą być spowodowane przez bezzałogowe statki powietrzne. Opracowana została koncepcja dedykowanego rozwiązania w postaci zintegrowanego, modułowego systemu do ochrony przeciw BSP, który może zostać zastosowany w rynku cywilnym do ochrony imprez masowych, strategicznych przedsiębiorstw oraz infrastruktury krytycznej w Polsce. Proponowany system ma na celu unieruchomienie BSP, które naruszyły zastrzeżoną przestrzeń powietrzną i bezpieczne sprowadzenie ich na ziemię. Projekt powstaje we współpracy Instytutu Techniki Uzbrojenia Wojskowej Akademii Technicznej z firmą Ellipsis Sp. z o.o.
Źródło:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2017, 8, 4 (30); 79-94
2081-5891
Pojawia się w:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identyfikacja charakterystyk aerodynamicznych mikrosamolotu
Aerodynamics characteristics identification of micro air vehicle
Autorzy:
Ambroziak, L.
Gosiewski, Z.
Kondratiuk, M.
Powiązania:
https://bibliotekanauki.pl/articles/213949.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
bezzałogowe aparaty latające
identyfikacja
charakterystyki aerodynamiczne
mikrosamolot
unmanned aerial vehicles
aerodynamics characteristics
identification
micro air vehicle
Opis:
W artykule zaprezentowano proces obliczeniowy charakterystyk aerodynamicznych bezzałogowego aparatu latającego. Jako obiekt badań wybrany został mikro-samolot typu delta w układzie latającego skrzydła o symetrycznym profilu płata. Do identyfikacji współczynników aerodynamicznych modelu oraz analizy opływu samolotu zostały zastosowane programy komputerowe XFLR5 oraz COMSOL Multiphysics wykorzystujące odpowiednio metodę panelową oraz metodę elementów skończonych. Wpracy zawarto matematyczny model opływu ciała, podstawy teoretyczne użytych metod obliczeniowych, pokazano wyniki przeprowadzonych analiz oraz dokonano ich porównania. W rezultacie oceniono możliwość zastosowania metod panelowych do obliczeń pochodnych stateczności mikro-samolotu.
The paper presents the computing process of Micro Air Vehicle (MAV) aerodynamics characteristics. As the research object a fixed wing in the delta system with a symmetrical airfoil was chosen. To identify the aerodynamic coefficients and to flow analyzing around the MAV model XFLR5 and COMSOL Multiphysics software were used basing on the panel method and the finite element method respectively. The paper contains the mathematical model of flow around the body and the theoretical framework of used methods. Flow analysis results for both methods were shown and their comparison was made. As a result, possibility of using panel methods to calculate the MAV aerodynamics coefficients was assessed.
Źródło:
Prace Instytutu Lotnictwa; 2011, 7 (216); 17-29
0509-6669
2300-5408
Pojawia się w:
Prace Instytutu Lotnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Real flight demonstration of pitch and roll control for UAV canyon flights
Autorzy:
Kownacki, C.
Powiązania:
https://bibliotekanauki.pl/articles/387581.pdf
Data publikacji:
2013
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
obstacle avoidance
autonomous control
unmanned air vehicle
reactive control
urban canyon
omijanie przeszkód
sterowanie autonomiczne
bezpilotowy statek latający
Opis:
The paper presents results of an experiment prepared to validate the autonomous control of obstacle avoidance designed for a micro UAV to fly in urban canyons. The idea of the obstacle avoidance assumes usage of two miniature laser rangefinders responsi-ble for obstacle detection and range measurement. Measured ranges from obstacles placed on both sides of UAV can be used to simulta-neous control of desired roll and pitch angles. Such combination of controls allows achieving high agility of UAV, because during a maneu-ver of obstacle avoidance UAV can make a turn and climb at the same time. In the experiment, controls of roll and pitch angles were veri-fied separately to ensure high reliability of results and clearance of UAV behavior in the real flight. Because of lack of appropriate objects, which can be used as obstacles, laser rangefinders were directed vertically to the ground instead of the original horizontal configuration. So sensors determine ranges from the ground during a descent flight of UAV, and if their values are lower than defined threshold, it could be interpreted as obstacle detection. The experiment results present UAV behavior adequate to designed controls of roll and pitch angle. The vehicle turns in the opposite direction to the sensing axis of laser rangefinder detecting an obstacle and starts climbing when both sensors detect obstacles at the same range below the threshold.
Źródło:
Acta Mechanica et Automatica; 2013, 7, 3; 148-154
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Motion characteristics after ricochet: an experimental investigation
Autorzy:
Chen, Guoming
Hu, Junhua
Liu, An
Feng, Jinfu
Hu, Qingqing
Powiązania:
https://bibliotekanauki.pl/articles/260197.pdf
Data publikacji:
2020
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
air-water trans-media vehicle (AWTMV)
ricochet
nose
initial conditions
responses
Opis:
The ricochet behaviour of the air–water trans-media vehicle (AWTMV) during water-entry crossing was experimentally investigated. Three types of small-scale AWTMV including cone, ogive, and flat nose were used in the test. The underwater trajectory, velocity, and inclination angle of projectiles during the ricochet process were obtained using a high-speed camera. The angle change of the AWTMV and the ratio of the residual velocity are introduced. Based on this result, the relationship between the ricochet responses and initial conditions was derived. The results of this study show that (1) a small incident angle and great velocity make the occurrence of ricochet behaviour easier, (2) the stability of the trajectory of projectiles with cone, ogive, and flat nose weakened in turn at the same initial conditions, (3) the angle change and the ratio of the residual velocity are linear functions of the incident angle and velocity.
Źródło:
Polish Maritime Research; 2020, 2; 4-10
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Volatile organic compounds removal from vehicle interior based on photocatalytic solution
Autorzy:
Bury, P.
Górniak, A.
Janicka, A.
Zawiślak, M.
Michniewicz, D.
Powiązania:
https://bibliotekanauki.pl/articles/245126.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
automotive vehicle
benzene-toluene-xylene compounds
vehicle interior
indoor air
photocatalysis
Opis:
The article presents results of research work which aim was development of solution for volatile organic compounds (VOCs) removal from vehicle indoor air. VOCs, especially benzene, toluene, and xylene (BTX), are air pollutants responsible for many civilizational diseases because of its carcinogenic and mutagenic properties. Concentration of those substances can be even few times higher in micro atmosphere of vehicle cabin than in other indoor atmospheres [1]. The aim of the scientific cooperation between Dr. Schneider Automotive Polska and the Wroclaw University of Science and Technology (WUST) is research on innovative (international range), product development – photocatalytic reactor characterized by Volatile Organic Compounds, especially BTX removal properties. The BTX reduction effectiveness, caused by photocatalytic reactor application in vehicle ventilation system, was subjected to in-depth analysis. The results showed difference on not only maximal benzene, toluene, and xylene reduction (separately) but also in the pattern of response surface. In some tested parameters, the hazardous compounds (as a BTX sum) were reduced for almost 70%. The photocatalytic reactor seems to be prospective solution for air quality improvement in any vehicle cabin.
Źródło:
Journal of KONES; 2018, 25, 3; 77-84
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative analysis of the emissions of carbon dioxide and toxic substances emitted by vehicles with ICE compared to the equivalent emissions of BEV
Autorzy:
Laskowski, Piotr
Zimakowska-Laskowska, Magdalena
Zasina, Damian
Wiatrak, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/2097569.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
air pollutant
vehicle
electric vehicle
ICE vehicle
BEV
zanieczyszczenie powietrza
pojazd
pojazd elektryczny
ICE
Opis:
In the article were compared the vehicles (by pairing) the vehicles on the basis of selected criteria considering vehicles’: weight, length, wheel width, maximum output and acceleration time. The article was carried out by analysing the available source materials and specific energy mix based on coal. The emission of air pollutants (exhaustive) was estimated using the mathematical calculation. In order to carry out the analysis, the data provided by the manufacturers of the considered cars were used, concerning fuel consumption by the cars equipped with the internal combustion engines or electricity consumption in the case of cars with equipped with electric motors. The air pollutants that were taken into consideration: carbon monoxide, nitrogen oxides, sulphur dioxide, carbon dioxide, and total particulate matter. Apart from the exhaustive emissions, the total particular matter emissions from the tyre and brake wear and road abrasion is also included. The pollutant emission was estimated on the basis of emission factors using the average mileage characterizing for driving in European conditions.
Źródło:
Combustion Engines; 2021, 60, 4; 102--105
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of an air spring with improved damping of vibrations
Autorzy:
Masliiev, A.
Makarenko, Y.
Masliiev, V.
Powiązania:
https://bibliotekanauki.pl/articles/411363.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
vehicle
air (pneumatic) spring
parameter
throttle
damping
vibrations
Opis:
The results of the research to substantiate the possibility and feasibility of raising the pneumatic spring suspension system for realization of efficient damping of vibrations of vehicle bodies, which are equipped with such a suspension, are presented. The influence of parameters of system components of the pneumatic spring suspension and gas-thermal and dynamic phenomena in it on the damping factor of vibrations and the development of the amplitudes of the vibrations in laminar and turbulent mode of the air flow through the orifice that connects the air spring and the additional reservoir was revealed. The dependence of the damping coefficient on the cross-section of the throttle orifice and the capacity of the additional reservoir in both modes of the air flow through the throttle was investigated. It was offered to take into account the "active" capacity of the air spring. It was also grounded the influence of natural frequency and density of the air on the damping ratio, which significantly improved the mathematical model that describes vibrations of boogie parts of vehicles on air springs. An example of calculations of the coefficient of damping of the pneumatic spring suspension for the vehicle was given. It is proved that the pneumatic spring suspension allows you to abandon hydraulic or other vibrations dampers completely by proper choosing of its parameters.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2015, 4, 4; 59-64
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exposure to Aerosols Particles on an Urban Road
Autorzy:
Piotrowicz, Adam
Polednik, Bernard
Powiązania:
https://bibliotekanauki.pl/articles/125234.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
ambient air quality
vehicle emissions
particulate matter
health effects
Opis:
Traffic-related emissions, apart from emissions from fuel combustion for heating purposes, significantly deteriorate air quality in cities. The above mainly concerns areas located close to busy traffic routes. According to epidemiological studies, traffic-related emissions have an adverse health effect. This specifically affects commuters (drivers and car passengers) as well as pedestrians. The aim of this study was to determine the variations of particle number and mass concentrations along a busy road in Lublin, Poland and their impact on the particle exposure for commuters and pedestrians. On-route and fixed-site measurements were performed in the summer (June) with a focus on peak and off-peak traffic hours and road sections with low and high traffic intensity. During peak hours, the average number concentration of ultrafine particles (PN0.1) in the road section near 4-way traffic intersections (TIs) was about 2 times higher than during off-peak hours. The average mass concentration of fine particles (PM2.5) was also approximately twice as high than in off-peak hours. Similar relations were found for other measured aerosol particles as well as with respect to particle exposure. The obtained results indicate the need for further extended research on traffic-related emissions and exposure and the ways of limiting them.
Źródło:
Journal of Ecological Engineering; 2019, 20, 5; 27-34
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies