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Wyszukujesz frazę "vehicle" wg kryterium: Temat


Tytuł:
Ultra-light vehicle for disable people
Autorzy:
Grzegożek, W.
Domagała, M.
Tematy:
ultralight vehicle
electric vehicle
laminates panels
vehicle for disable people
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Wydawca:
Instytut Techniczny Wojsk Lotniczych
Powiązania:
https://bibliotekanauki.pl/articles/246304.pdf  Link otwiera się w nowym oknie
Opis:
The paper presents a study on concept of ultra-light vehicle created by innovatory technology with laminate panels what provided low weight of self-supporting body and in consequences low vehicle weight. The usage of panels with aluminum honeycomb core and glass fiber based skins allows creating large flat surfaces for interior and vehicle body without any additional treatment. Glued panels with aluminium core make closed, rigid structure of self-supporting body with relatively low weight. Independent suspension system which components are made of carbon fiber also guarantees low weight. Vehicle is powered by two electric motors BLDC type with power of 2 kW each, and they are placed in rear wheels. Low vehicle weight has important meaning, particularly for electric vehicles and its range. Presented vehicle belongs to L6-e category and does not require any licenses for driving. The vehicle is dedicated for disable people on wheel chairs. The fundamental problem for disable people on wheelchairs is getting inside a vehicle without any help. Proposed solution at the conceptual vehicle allows for getting the wheel chair inside the vehicle by the use of lower part of the rear door and the wheel chair play a role of the vehicle seat. Such solution also makes that the level of physical disability has no influence on auxiliary devices used for vehicle driving.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and numerical buoyancy analysis of tracked military vehicle
Autorzy:
Kotowski, M.
Barnat, W.
Grygorowicz, M.
Panowicz, R.
Dybcio, P.
Tematy:
buoyancy
military vehicle
amphibious vehicle
CFD
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Wydawca:
Instytut Techniczny Wojsk Lotniczych
Powiązania:
https://bibliotekanauki.pl/articles/242914.pdf  Link otwiera się w nowym oknie
Opis:
The paper presents experimental validation of numerical flow analysis around tracked amphibious military vehicle. The aim of the study was to validate the simulation results and visualize the flow around optimized geometry To perform numerical simulations, a Computational Fluid Dynamics code FLUENT was used. The software is dedicated to model flow, turbulence, heat transfer, and reactions. The area was divided into two domains – air and water. During the simulation, water was moving with speed specified in standardization. However the numerical techniques are constantly developed and improved there is still a strong need for verification especially in buoyancy analysis and water performance evaluation. Results showed quite good agreement with literature after some modifications of the model. Then the flow was numerically visualized. That allowed in-depth analysis of the flow around each of vehicle's parts and some major and minor modifications were proposed. Modified geometry was analyzed and obtained results will be compared with previous ones. Additional stability and manoeuvrability tests were conducted. The results will be used to modify the geometry of vehicle and conduct experimental tests to verify the numerical code performance and check the actual change in vehicle's water performance. Future work will also consider propeller influence on results.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the tire relaxation on the simulation results of the vehicle lateral dynamics in aspect of the vehicle driving safety
Autorzy:
Luty, W.
Tematy:
tire relaxation
vehicle safety
lateral dynamics
vehicle dynamics simulation
vehicle driving safety
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Wydawca:
Instytut Techniczny Wojsk Lotniczych
Powiązania:
https://bibliotekanauki.pl/articles/244449.pdf  Link otwiera się w nowym oknie
Opis:
Selected experimental research results of truck tire in steady-state side cornering and transient cornering conditions are presented in this paper. Experimental research results of the tire have been used in simulation research of medium duty truck in nonlinear driving conditions. The paper presents the structure of the vehicle dynamics model and a description of applied tire-road interaction model. Simulation research of the vehicle lateral dynamics has been performed in two variants: without and with the model of tire relaxation. During research, the tire relaxation length has been also changed. The steering wheel angle changes were forced as continuous sinusoidal excitation signal with a constant amplitude and with continuously increasing frequency. There have been analysed basic physical quantities characterizing the vehicle lateral dynamics connected with the vehicle active safety, especially including body yaw velocity and lateral acceleration in the centre of the truck body mass. An analysis of research results have been performed in the time and frequency domain. Time courses of analysed physical quantities and their frequency spectrum, obtained for tire-road interaction model without and with the tire relaxation (with different values of relaxation length) have been compared. Based on the simulation research results there have been considered the influence of tire relaxation on the vehicle performance. There have been shown that the tire relaxation can significantly change courses of observed physical quantities connected with vehicle lateral dynamics connected with vehicle driving safety.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability of wheeled armoured personnel carrier firing sideways
Autorzy:
Wiśniewski, Andrzej
Rybak, Piotr
Tematy:
wheeled vehicle
vehicle dynamics
vehicle stability
armament
finite element method
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Wydawca:
Instytut Techniczny Wojsk Lotniczych
Powiązania:
https://bibliotekanauki.pl/articles/246344.pdf  Link otwiera się w nowym oknie
Opis:
One of the most important and commonly used means of transport in the armed forces of various countries is wheeled armoured personnel carriers. After proper preparation, beside transport tasks, they can carry out special tasks, as part of regular and irregular activities within purpose of supporting actions of troops. This paper presents preliminary results of numerical research of wheeled armoured personnel carrier with 8x8-drive system. The effect of impact of large calibre cannon (120 mm) with reduced recoil force on transporter behaviour was investigated. The research object model consists of shell, solid and discrete elements. The research was carried out in the LS-DYNA software. Considered variant applies to sideways firing (to the left of the vehicle) for cannon elevation angle 16 deg. Numerical model of standing still on the flat ground wheeled armoured personnel carrier was preloaded with the gravitational force. The results of post-firing vehicle behaviour including angular displacement of the hull, dynamic deflections of the suspensions and impact on the stability of the wheeled vehicle were evaluated.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intelligent transportation : a hybrid FSO/VLC-assisted relay system
Autorzy:
EL-Garhy, Suzan M.
Khalaf, Ashraf A. M.
Aly, Moustafa H.
Abaza, Mohamed
Tematy:
intelligent transportation systems
infrastructure-to-vehicle
vehicle-to-vehicle
relay
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Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Powiązania:
https://bibliotekanauki.pl/articles/2174852.pdf  Link otwiera się w nowym oknie
Opis:
Various intelligent transportation systems are proposed in different forms of wireless communication technologies. Recently, the importance of visible light communication and free-space optics has been demonstrated in accomplishing vehicle-to-vehicle and infrastructure-to-vehicle communication systems, due to power efficiency, free licenses, and safety for human health. In this paper, a new hybrid relay system supported by free-space optics/visible light communication with two scenarios is proposed. The first one is that the data are transferred from the source to the relay through a free-space optics communication link and are then directed to the destination through a visible light communication link. The second scenario is that the data are transmitted from the source to the destination passing through two different relays to ensure larger coverage. A 10‾⁶ bit error rate is achieved at a distance of 900 m for the first scenario with a remarkable signal-to-noise ratio of ~25.5 dB, while the largest distance that can be covered by the second scenario is 1200 m with a signalto- noise ratio of ~30 dB.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Failure and reliability analysis of heavy firefighting and rescue vehicles: a case study
Autorzy:
Selech, Jarosław
Rogula-Kozłowska, Wioletta
Piątek, Piotr
Walczak, Agata
Pieniak, Daniel
Bondaronok, Paweł
Marcinkiewicz, Jacek
Tematy:
firefighting vehicle
rescue vehicle
reliability
maintainability
availability
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Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Powiązania:
https://bibliotekanauki.pl/articles/59112840.pdf  Link otwiera się w nowym oknie
Opis:
The purpose of the article was to analyse the reliability, maintainability, and availability estimates of firefighting and rescue engines. Analysing the reliability parameters of heavy firefighting and rescue vehicles over time requires knowledge of their failures. In this article, failure data from the six years of maintenance of ten heavy firefighting and rescue vehicles from ten were analysed in relation to two main subsystems. Reliability analysis was performed and the best-fit distribution was found, with the parameters calculated. For both subsystems, the chassis combined with the cabin and the superstructure, the 2P-Weibull distributionwas identified as the most suitable fit. The availability and maintenance indicators for each vehicle and the individual subsystems were calculated. It was clearly defined that there exists a significant difference between the two subsystems analysed in terms of failure characteristics, as well as maintainability and availability parameters.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Safety requirements for road vehicles
Autorzy:
Liščák, Š.
Moravčík, L
Jaśkiewicz, M.
Tematy:
technical requirements
safety of vehicle
construction of vehicle
regulatory acts
approval of Vehicle
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Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Powiązania:
https://bibliotekanauki.pl/articles/359904.pdf  Link otwiera się w nowym oknie
Opis:
The road safety is affected by several factors quality of infrastructure, behaviour of drivers, including their proper training and also safe cars. For the safety of vehicles in the approving process a number of regulations (regulatory acts) apply, regulating the technical requirements in the active and passive vehicle safety, but also in the environment. In the area of technical requirements for vehicles and their parts significant changes occur constantly, mainly due the progressive technological developments. A large number of regulatory acts are often changed due to the tightening. These regulatory acts relates directly to manufacturers, because their manufactured vehicles have to meet these requirements. That these regulatory instruments are evolving in the right direction proved the fact that due to better road safety the number of fatal accidents in the last two decades shrunk, although the volume of traffic has tripled. A significant progress has been achieved only through the improved vehicle safety and only in a small measure thanks to the improvement and upgrading of the infrastructure.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Opredelenie resursa vosstanovlennykh detalejj avtotransportnykh sredstv
Determination of parts recovery resources motor vehicles
Autorzy:
Ruzhylo, Z.
Kyurchev, S.
Rogovskiy, L.
Melnyk, V.
Tematy:
wear
motor vehicle
operation
wear degree
vehicle mileage
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Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Powiązania:
https://bibliotekanauki.pl/articles/76885.pdf  Link otwiera się w nowym oknie
Opis:
Анализируются виды износа, возникающие при эксплуатации автотранспортных средств. Рассматривается зависимость степени износа от пробега автомобиля.
Analyzes the types of wear selfarising in operation of motor vehicles. We consider dependence of degree of wear on mileage of vehicle.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the end-of-life the front suspension beam of a vehicle
Autorzy:
Kowalski, Sławomir
Opoka, Kazimierz
Ciuła, Józef
Tematy:
vehicle suspension system
fretting wear
suspension beam
vehicle
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Powiązania:
https://bibliotekanauki.pl/articles/2172028.pdf  Link otwiera się w nowym oknie
Opis:
The aim of the article is focused on assessing the degree of end-of-life for the vehicle front suspension beam. The first stage of the problem taken was represented by a road test of the vehicle at distance expressed by 100.000 km. Following the end of the operation tests, the suspension beam was dismantled and subjected to laboratory tests. The tests demonstrated numerous beam top layer plastic deformations, which came into being as a result of the vehicle driving onto an obstacle on the roadway or onto raised road infrastructure elements. At the point of connection of the stabiliser rod to the beam, surface degradation was noted, which consisted in the considerable change of the surface profile, hardness reduction and the grey and dark brown colour. Corrosion regions and fretting wear traces were noted. Corrosion pits, scratches and material build-ups was observed. The analysis of the chemical composition of wear products demonstrated the presence of elements such as iron, oxygen, chlorine and silicon, as an effect of operational conditions.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Motor vehicle diagnostics in military units
Autorzy:
Markowska, K.
Woźniak, M.
Tematy:
motor vehicle diagnostics
vehicle operation
vehicle condition
military-civilian cooperation
transportation support
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Wydawca:
Instytut Techniczny Wojsk Lotniczych
Powiązania:
https://bibliotekanauki.pl/articles/247518.pdf  Link otwiera się w nowym oknie
Opis:
Transport pertains to all functional areas of the State’s activities on every administrative level. Road transport is a very important branch of global economy and constitutes a part of the logistics network. It pertains to the transportation of cargo, items, and people. Cooperation between the branches of civilian transportation and military logistics must be the focus of continuous improvement efforts. Enhancements in this respect can serve to avoid possible failures and disruptions. The quality and availability of infrastructure plays a significant role, not only with respect to civilian, but also military assets. The condition of the vehicle is important for the safety of road transport. The provision of transport services in a military unit should mainly rely on military-civilian cooperation and effective communications. The condition of the means of transportation has been indicated as a factor influencing transport safety. Employing new technology and solutions enables constant improvements to the diagnostic system, broadening the knowledge and enhancing the skills of the motor vehicle driver in terms of proficiency in operating and maintaining the vehicle used.
Dostawca treści:
Biblioteka Nauki
Artykuł

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