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Search results for: jet grouting
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Acoustic aspects of synthetic jet – review
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A review of acoustic aspect in synthetic jet
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Interference in axisymmetric synthetic jet actuator
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Impact of the confinement plate on the synthetic jet
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Numerical simulation of grouding experiment
PublicationJednym z możliwych sposobów zwiększenia odporności kon strukcji statku na kolizje jest zaprojektowania jej w taki sposób, aby podczas zderzenia absorbowała możliwie dużą ilość energii. Jednym z nowych pomysłów jest idea, będąca tematem projektu CORET (EUREKA E!3614), zwiększenia odporności na rozdarcie poszycia poprzez dodanie do obecnej konstrukcji półelastycznej polimerowo-betonowej bariery ochronnej. Proces projektowania nowej...
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UWARUNKOWANIA I SKUTKI ŻYWIOŁOWEJ SUBURBANIZACJI W POLSCE. CZY OPANOWANIE JEJ JEST MOŻLIWE?
PublicationArtykuł dotyczy procesu żywiołowej suburbanizcji (urban sprawl) w Polsce. Jego celami są: (1) analiza powiązań między negatywnymi skutkami tego procesu, (2) prezentacja negatywnych skutków dla transportu i zużycia energii oraz ładu przestrzennego, (3) analiza sposobów przeciwdziałania negatywnym procesom, w tym uwarunkowań (w szczególności ograniczeń) stosowania tych sposobów i ich skuteczności. Jako metody zastosowano: obserwację,...
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The mechanism of grouting action under the base of bored pile
PublicationThe grouting under the base of bored pile is carried out in order to reduce pile settlement and improve its bearing capacity. The principal aim of grouting is to introduce an initial force between the soil and the pile base. In non-cohesive soil, the grouting can also enlarge the pile base area and therefore improve the base resistance. The example of static load tests on instrumented bored piles installed with and without grouting...
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Optimal routing in a transportation network
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Path Coloring and Routing in Graphs.
PublicationW rozdziale omówione zostały problemy kolorowania ścieżek i routingu w grafach. Podano podstawowe definicje związane z tymi problemami, znane wyniki wraz z dyskusją złożoności obliczeniowej dla grafów ogólnych i dla kilku podstawowych klas grafów oraz zastosowania.
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Resilient Routing in Communication Networks
PublicationThis important text/reference addresses the latest issues in end-to-end resilient routing in communication networks. The work highlights the main causes of failures of network nodes and links, and presents an overview of resilient routing mechanisms, covering issues related to the Future Internet (FI), wireless mesh networks (WMNs), and vehicular ad-hoc networks (VANETs). For each of these network architectures, a selection of...
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Taxonomy of Schemes for Resilient Routing
PublicationThis chapter provides a taxonomy of schemes for resilient routing followed by a discussion of their application to contemporary architectures of communication networks. In particular, a general classification of schemes for resilient routing is first presented followed by a description of the reference schemes for IP networks. The chapter in its later part focuses on the representative techniques of resilient routing for a multi-domain...
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An investigation on the role of GMA grafting degree on the efficiency of PET/PP-g-GMA reactive blending: morphology and mechanical properties
PublicationGlycidyl methacrylate (GMA) has been grafted on polypropylene (PP) with the aid of styrene (St) comonomer, by changing dicumyl peroxide initiator content, GMA level, and St concentration. The performance of the resulting PP-g-GMA reactive material towards static and dynamic mechanical properties of poly (ethylene terephthalate) (PET) was monitored in terms of grafting reaction variables and compatibilizer content. Fourier transform...
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Impact of the Confinement Plate on the Velocity of Synthetic Jet
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Synthetic jet actuator with two opposite diaphragms
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Some aspects surface cooling by impinging jet
PublicationW pracy przedstawiono wyniki badań wymiany ciepła, uskoku hydraulicznego i stabilności podczas napływu strugi na powierzchnię ciała stałego.
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A Novel Reliable Routing Scheme for VANETs
PublicationSieci bezprzewodowej transmisji informacji bazujące na rodzinie standardów 802.11, zastosowane w przypadku komunikacji między pojazdami (VANET), mogą istotnie przyczynić się do poprawy bezpieczeństwa ruchu drogowego. Z uwagi na wysoki stopień mobilności pojazdów, dobór tras w sieciach VANET jest problemem trudnym, zwłaszcza w przypadku transmisji wieloskokowej. Rozwiązania dostępne w literaturze ukierunkowane na poprawę dostępności...
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Clonal selection algorithm for vehicle routing
PublicationOver the years several successful computing techniques have been inspired by biological mechanisms. Studies of the mechanisms that allow the immune systems of vertebratesto adapt and learn have resulted in a class of algorithms called artificial immune systems. Clonal selection is a process that allows lymphocytes to launch a quick response to known pathogens and to adapt to new, previously unencountered ones. This paper presents...
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Acoustic and Flow Aspects of Novel Synthetic Jet Actuator
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Comparison of the Axial Fan and Synthetic Jet Cooling Systems
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Local Nusselt number evaluation in the case of jet impingement
PublicationJet impingement still is one of demanding cases regarding computational fluid dynamics, due to its highly turbulent behaviour, with occurrence of turbulent-laminar transition. Even recently developed methods exhibit some drawbacks – RANS based simulations lack accuracy, LES and DNS based ones require too much computational time. Hybrid methods also exist, but their development and validation is in progress. Nevertheless, CFD application...
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Multicriteria Evolutionary Weather Routing Algorithm in Practice
PublicationThe Multicriteria Evolutionary Weather Routing Algorithm (MEWRA) has already been introduced by the author on earlier TransNav 2009 and 2011 conferences with a focus on theoretical application to a hybrid-propulsion or motor-driven ship. This paper addresses the topic of possible practical weather routing applications of MEWRA. In the paper some practical advantages of utilizing Pareto front as a result of multicriteria optimization...
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EVOLUTIONARY MULTI–OBJECTIVE WEATHER ROUTING OF SAILBOATS
PublicationThe paper presents a multi-objective method, which optimises the route of a sailboat. The presented method makes use of an evolutionary multi-objective (EMO) algorithm, which performs the optimisation according to three objective functions: total passage time, a sum of all course alterations made during the voyage and the average angle of heel. The last two of the objective functions reflect the navigator’s and passenger’s comfort,...
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Towards Improving Optimised Ship Weather Routing
PublicationThe aim of the paper is to outline a project focusing on the development of a new type of ship weather routing solution with improved uncertainty handling, through better estimation of ship performance and responses to sea conditions. Ensemble forecasting is considered to take into account the uncertainty levels that are typical of operations in a stochastic environment. Increased accuracy of weather prediction is achieved through...
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Simulation model for evaluation of QOS dynamic routing
PublicationCurrent informational networks use a large variety of technologies to support data exchange. Most of them are focused on IP protocol and include mechanisms which by definition should supply demanded QoS. One of those mechanisms is efficient path calculation - routing. Traffic offered to the network can change very rapidly in short term. Routing should support such traffic changes and all the time calculate valid paths in terms...
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METHOD OF ROUTING SHIPS SAILING IN DEDICATED ENVIRONMENT
PublicationThe method for determining the suboptimal route of sailing vessels operating in a restricted area of the sea are proposed in the paper. The dynamics of the environment including weather conditions and speed characteristics of ships sailing are considered. As optimiza-tion criterion, measure sailing time T, and the number of maneuvers performed ω, are taken into account. An heuristic algorithm, and the appropriate application routing...
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A distributed scheme for inter-domain routing optimization
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Multi-objective weather routing of sailing vessels
PublicationThe paper presents a multi-objective deterministic method of weather routing for sailing vessels. Depending on a particular purpose of sailboat weather routing, the presented method makes it possible to customize the criteria and constraints so as to fit a particular user’s needs. Apart from a typical shortest time criterion, safety and comfort can also be taken into account. Additionally, the method supports dynamic weather data:...
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Routing equal-size messages on a slotted ring
PublicationAnalizujemy problem routingu wiadomości w sieci slotted ring, biorąc pod uwagę dwa kryteria optymalizacyjne: długość uszeregowania oraz liczbę 'cykli' pracy sieci. Optymalny routing dla wiadomości o rozmiarze k jest silnie NP-trudny, natomiast dla k=q, gdzie q jest rozmiarem sieci, można obliczyć w czsie O(n^2log n) dla pierwszego kryterium. Podajemy również algorytm o czasie działania O(nlog n) oraz o stałym współczynniku dobroci....
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Collision Risk-Informed Weather Routing for Sailboats
PublicationSelected COLREG rules, good seamanship and sheer common sense indicate that it is in a sailboat's interest to follow collision-free routes without relying on large power-driven ships to give way. Until now, however, no method has integrated a sailboat's weather routing with collision risk monitoring and collision avoidance. Therefore, a new deterministic approach to combine the above features within one method is introduced here....
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Disaster-Resilient Routing Schemes for Regional Failures
PublicationLarge-scale natural disasters can have a profound effect on the telecommunication services in the affected geographical area. Hence, it is important to develop routing approaches that may help in circumventing damaged regional areas of a network. This prompted the development of geographically diverse routing schemes and also of disaster-risk aware routing schemes. A minimum-cost geodiverse routing, where a minimum geographical...
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CFD analysis of jet flows ejected from different nozzles
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Acoustic and Flow Aspects of Synthetic Jet Actuators with Chevron Orifices
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Synthetic jet actuator efficiency based on the reaction force measurement
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Impact of the Soundproofing in the Cavity of the Synthetic Jet Actuator on the Generated Noise
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Turbulence models impact on the flow and thermal analyses of jet impingement
PublicationAccurate numerical reconstruction of heat and mass transfer processes in particular applications, such a jet impingement, is difficult to obtain even with the use of modern computational methods. In the proposed paper, the flow and thermal phenomena occurring during single minijet impingement on the flat, concave and convex, heated surfaces were considered. Problem of impingement on non-flat surface, still not common and purely...
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A numerical analysis of the thermal effects in the jet impingement stagnation zone
PublicationMost of the flows occurring in the engineering systems are turbulent and their accurate numerical analysis is still challenging, especially when combined with the heat transfer. One of the methods of heat transfer enhancement is utilization of the turbulent impinging jets, which were recently applied also in the heat exchangers. Their positive impact on the heat transfer performance was proven, but many questions related to its...
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Grouping macromodels by using multilevel model order reduction
Publicationartykuł pprezentuje nowatorską technikę grupowania makromodeli dla metody fdtd. nowa technika bazuje na schemacie wielopoziomowej redukcji rzędu modeli. grupowanie makromodeli pozwala na zwiększenie szybkości symulacji w porównaniu do niezgrupowanych makromodeli, zapewniając przy tym porównywalną dokładność.
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Multi-objective Weather Routing with Customised Criteria and Constraints
PublicationThe paper presents a weather routing algorithm utilising a multi-objective optimisation with constraints, namely the Multi-objective Evolutionary Weather Routing Algorithm (MEWRA). In the proposed approach weather route recommendations can be made simultaneously e.g. for passage time, fuel consumption and safety of passage by means of Pareto optimisation. The sets of criteria and constraints in the optimisation process are fully...
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Survivability function - a measure of disaster-based routing performance.
PublicationZnaczenie przeżywalności sieci transmisji danych systematycznie rośnie, ponieważ awaria pojedynczego elementu może dotknąć miliony użytkowników na dużym obszarze. Zdefiniowano funkcję przeżywalności: prawdopodobieństwo realizacji określonego procentu strumieni użytkowników po awarii oraz atrybuty przeżywalności. Celem pracy było zbadanie wpływu protokołów doboru tras architektury TC/IP na funkcję i atrybuty przeżywalności. Pracę...
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Traffic Type Influence on Performance of OSPF QoS Routing
PublicationFeasibility studies with QoS routing proved that the network traffic type has influence on routing performance. In this work influence of self-similar traffic for network with DiffServ architecture and OSPF QoS routing has been verified. Analysis has been done for three traffic classes. Multiplexed ON-OFF model was used for self-similar traffic generation. Comparison of simulation results were presented using both relative and...
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Cooperative multi-provider routing optimization and income distribution
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Traffic routing in the Warsaw metropolitan network: a deployment strategy
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Toward Fast Calculation of Communication Paths for Resilient Routing
PublicationUtilization of alternate communication paths is a common technique to provide protection of transmission against failures of network nodes/links. However, a noticeable delay is encountered when calculating the relevant sets of disjoint paths using the available algorithms (e.g., using Bhandari’s approach). This, in turn, may have a serious impact on the ability of a network to serve dynamic demands...
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Mass and momentum conservation in the simplified flood routing models
PublicationW pracy wykazano, że uproszczone modele fal wezbraniowych w postaci fali kinematycznej reprezentują w przypadku liniowych zarówno zasadę zachowania masy jaki i pędu, natomiast w przypadku nieliniowym, reprezentują albo zasadę zachowania masy albo pędu, zależnie od postaci zachowawczej równania. Ponadto wykazano, iż nieliniowa fala dyfuzyjna nie spełnia ani całkowowej zasady zachowania masy ani pędu.
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Selected Multi-Criteria Green Vehicle Routing Problems
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Traffic Type Influence on Performance of OSPF QoS Routing
PublicationFeasibility studies with QoS routing proved that the network traffic type has influence on routing performance. In this work influence of self-similar traffic for network with DiffServ architecture and OSPF QoS routing has been verified. Analysis has been done for three traffic classes. Multiplexed On-Off model was used for self-similar traffic generation. Comparison of simulation results was presented using both relative and non-relative...
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Reliable Anycast and Unicast Routing: Protection against Attacks
PublicationObecne sieci są przeważnie chronione przed awariami losowymi, a topologie sieci są w większości uznawane za regularne. Znane mechanizmy ochrony dotyczą typowo transmisji unicast (jeden-do-jednego). Jednakże w związku z obserwowaną konwergencją technologii/usług, inne odmiany transmisji (np. anycast - jeden-do-jednego-z-wielu) nabierają znaczenia. Co więcej, okazuje się, iż często awarie nie mają losowego charakteru, a topologie...
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REVIEW OF WEATHER FORECAST SERVICES FOR SHIP ROUTING PURPOSES
PublicationWeather data is nowadays used in a variety of navigational and ocean engineering research problems: from the obvious ones like voyage planning and routing of sea-going vessels, through the analysis of stability-related phenomena, to detailed modelling of ships’ manoeuvrability for collision avoidance purposes. Apart from that, weather forecasts are essential for passenger cruises and fishing vessels that want to avoid the risk...
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Inverse Flood Routing Using Simplified Flow Equations
PublicationThe paper considers the problem of inverse flood routing in reservoir operation strategy. The aim of the work is to investigate the possibility of determining the hydrograph at the upstream end based on the hydrograph required at the downstream end using simplified open channel flow models. To accomplish this, the linear kinematic wave equation, the diffusive wave equation and the linear Muskingum equation are considered. To achieve...
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Continuous and catalyst free synthesis of graphene sheets in thermal plasma jet
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