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Wyszukujesz frazę "multi-mode" wg kryterium: Temat


Tytuł:
Application possibilities of electric driven propulsion of multi-mode ships
Autorzy:
Herdzik, J.
Tematy:
ships propulsion
electric propulsion
multi-mode ships
propulsion systems
Pokaż więcej
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Powiązania:
https://bibliotekanauki.pl/articles/246217.pdf  Link otwiera się w nowym oknie
Opis:
The ship propulsion solution based on unconventional thrusters driven by electric motors is most often applied for the multi-mode ships. These ships ought to have dynamic positioning system. It forces an application of a few thrusters (most often four, seldom more up to eight). Records from a number of multi-mode ships show amean load of less than 40% of maximum load on the propulsion system. In other side the demand for electric energy of ship industrial part is large, more often than for the propulsion part. In that case the diesel-electric propulsion system application may be economical, because the electric energy generation for all ship's purposes makes possible the main engines work on the optimum loads on lowest specific fuel consumption and allows them a long-term work on heavy fuels. For multi-mode ships like cable ships, suppliers, drilling vessels are convenient an application of unconventional thrusters with direct electric propulsion as well, especially for dynamic positioning systems. The efficiency of the thrusters is a predominant factor for the successful and economical operation. Forecasted development and rise of quantity of diesel-electric propulsion (it means with electrical transmission) would cause increased interest of unconventional thrusters. Ultimately they may revolutionize ship propulsion systems.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problems of propulsion arrangement choice of multi-mode ship
Autorzy:
Herdzik, J.
Tematy:
ships propulsion
propulsion arrangement
multi-mode ships
propulsion choice
Pokaż więcej
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Powiązania:
https://bibliotekanauki.pl/articles/246914.pdf  Link otwiera się w nowym oknie
Opis:
The propulsion system of multi-mode ships cause many problems of proper the choise of propulsion system elements and theirs arrangement in the design process. This system has to fulfil at least two inverse demands. It ought to make possible efficient ship shift (transit mode) from the port to the off shore work place and return to base, to ensure a ship survive at sea in the worst sea condition possible on that sea area and to fulfil conditions of dynamic positioning accuracy (stationkeeping mode) at specified bad state of the sea - not to stop the ship work for long time. The dynamic positioning systems require multi-element ship propulsion application. The fulfilment, all required possibilities and accuracy of ship positioning by chosen propulsion system specified in the project data, is the most important project problem to obtain the minimum investment costs. The redimensioning of propulsion system, increasing the number of thrusters and theirs possibilities gives the benefits in dynamic positioning accuracy, but increases the investment costs. An expensive project may not be realized because of price. The aim of designer is the choice optimum solution of propulsion system, which is fulfils all expectations of ship owner and crew, and performs all project assumptions.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application possibilities of electric driven propulsion of multi-mode ships
Autorzy:
Herdzik, J.
Tematy:
ships propulsion
electric propulsion
multi-mode ships
propulsion systems
Pokaż więcej
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Powiązania:
https://bibliotekanauki.pl/articles/247580.pdf  Link otwiera się w nowym oknie
Opis:
The ship propulsion solution based on unconventional thrusters driven by electric motor s is most often applied for the multi-mode ships. These ships ought to have dynamic positioning system. It forces an application of a few thrusters (most often four, seldom more up to eight). Records from a number of multi-mode ships show a mean load of less than 40% of maximum load on the propulsion system. In other side the demand for electric energy of ship industrial part is large, more often than for the propulsion part. In that case the diesel-electric propulsion system application may be economical, because the electric energy generation for all ship 's purposes makes possible the main engines work on the optimum loads on lowest specific fuel consumption and allows them a long-term work on heavy fuels. For multi-mode ships like cable ships, suppliers, drilling vessels are convenient an application of unconventional thrusters with direct electric propulsion as well, especially for dynamic positioning systems. The efficiency of the thrusters is a predominant factor for the successful and economical operation. Forecasted development and rise of quantity of diesel-electric propulsion (it means with electrical transmission) would cause increased interest of unconventional thrusters. Ultimately they may revolutionize ship propulsion systems.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Udostępnianie złóż kopalin użytecznych z wykorzystaniem kombajnów pełnoprzekrojowych TBM
Accessing ore deposits using TBM machines
Autorzy:
Kotwica, K.
Mendyka, P.
Tematy:
udostępnianie złóż
kombajn TBM
tarcza EPB
tarcza zawiesinowa
TBM typu Multi-mode
ore deposits accessing
TBM machine
EPB shield
slurry shield
Multi-mode TBM
Pokaż więcej
Wydawca:
STE GROUP
Powiązania:
https://bibliotekanauki.pl/articles/113393.pdf  Link otwiera się w nowym oknie
Opis:
W artykule przedstawiono możliwości oraz problemy związane z udostępnieniem złóż kopalin użytecznych upadowymi drążonymi z wykorzystaniem kombajnów pełnoprzekrojowych typu rozporowego jak również osłonowego, zamkniętego oraz kombajnów typu Multi-mode.
The article presents the possibilities annd problems connected with accesing mineral deposits with decline shafts using gripper type full diameter TBM Machines as well as closed shields and Multi-mode ones.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Propulsion characteristics of multi-mode ships in aspect of ships dynamic positioning application
Autorzy:
Herdzik, J.
Tematy:
ships propulsion
propulsion characteristics
multi-mode ships
dynamic positioning systems
Pokaż więcej
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Powiązania:
https://bibliotekanauki.pl/articles/243980.pdf  Link otwiera się w nowym oknie
Opis:
The dynamic positioning systems require multi-element ship propulsion application. The chosen solutions have decisive effect on propulsion system possibilities, in ship dynamic positioning accuracy also. The automation system has an essential influence on it, because it is an integral part with propulsion system mponsible for this process. The most often ship propulsion solution based on unconventional thrusters driven by electric motor s also. A few independent propulsion systems is essential but it complicates this system, it is limited the number (most often to 4, seldom more up to eight). There are no solutions with traditional rudder and steering gear. These functions take over azimuthing thrusters because they can generale directional thrust force. It must be settle the question of the number of thruster choose and the span angle of azimuthing (most often by thruster turning). In that case it gets the possibilities of ship positioning, they may display as propulsion system characteristics, giving a view on ąuality of positioning process. The last veriflcation is made in real sea conditions when it may test if chosen solution of ship propulsion system fulfils the requirements of positioning accuracy. It was presented the examples of multi-mode ship propulsions and parameters of theirs propulsion plants.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of a single mode wave generation in cylindrical systems applying numerical methods
Autorzy:
Gorazd, Łukasz
Snakowska, Anna
Tematy:
cylindrical duct
multi-mode wave propagation
single mode generation
kanał cylindryczny
wielomodowa propagacja fali
generacja pojedynczego modu
Pokaż więcej
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Powiązania:
https://bibliotekanauki.pl/articles/127909.pdf  Link otwiera się w nowym oknie
Opis:
The paper presents simulations of a selected single mode generation in systems containing duct-like elements applying the finite element method (FEM). Simulations were carried out for values of the Helmholtz number exceeding the plane-wave propagation, i.e. for a multimode wave. The presented results constitute the first step to analyse propagation of the multimode wave through more complicated systems such as mufflers, even in a form of a cascade. Propagation of the incident wave in the form of a single mode greatly simplifies solutions of many problems, to mention only derivation of the transmission or the scattering matrices. The results obtained can be applied to analyse the effectiveness of attenuation of acoustic silencers or elements of heating, ventilation and air conditioning systems (HVAC) at the design stage. Results of simulations are compared with already published experimental data obtained in a measurement set-up containing the self-designed single mode synthesizer.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-mode switching control of hybrid electromagnetic suspension based on road conditions adaptation
Autorzy:
Meng, Xiangpeng
Ding, Renkai
Sun, Zeyu
Wang, Ruochen
Chen, Long
Tematy:
hybrid electromagnetic suspension
multi-mode switching control
road conditions
adaptation
dynamic performance
energy regeneration
Pokaż więcej
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:
https://bibliotekanauki.pl/articles/2055038.pdf  Link otwiera się w nowym oknie
Opis:
In this research, a hybrid electromagnetic actuator is proposed to coordinate the contradictions between dynamic performance and energy consumption of an electromagnetic suspension. The hybrid electromagnetic suspension (HEMS) is configured to operate in the passive energy regeneration mode, active control ride comfort mode or active control driving safety mode depending on the road excitation frequency. Then, the HEMS system is modeled. The simulation results show that the HEMS can automatically switch between different modes, and realize an effective coordination between dynamic performance and energy saving. Finally, a quarter car test is conducted, which verifies the effectiveness of the multi-mode switching control.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy-saving optimal scheduling under multi-mode “source-network-load-storage” combined system in metro station based on modified Gray Wolf Algorithm
Autorzy:
Tian, Jingjing
Qian, Yu
Zhao, Feng
Mo, Shenglin
Xiao, Huaxuan
Zhu, Xiaotong
Liu, Guangdi
Tematy:
bilevel optimization
grey wolf optimization algorithm
multi-mode
peak shaving
valley-filling
source-network-load-storage
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:
https://bibliotekanauki.pl/articles/59111824.pdf  Link otwiera się w nowym oknie
Opis:
Aiming to address power consumption issues of various equipment in metro stations and the inefficiency of peak shaving and valley filling in the power supply system, this study presents an economic optimization scheduling method for the multi-modal “source-network-load-storage” system in metro stations. The proposed method, called the Improved Gray Wolf Optimization Algorithm (IGWO), utilizes objective evaluation criteria to achieve economic optimization. First, construct a mathematical model of the “source network-load-storage” joint system with the metro station at its core. This model should consider the electricity consumption within the station. Secondly, a two-layer optimal scheduling model is established, with the upper model aiming to optimize peak elimination and valley filling, and the lower model aiming to minimize electricity consumption costs within a scheduling cycle. Finally, this paper introduces the IGWO optimization approach, which utilizes meta-models and the Improved Gray Wolf Optimization Algorithm to address the nonlinearity and computational complexity of the two-layer model. The analysis shows that the proposed model and algorithm can improve the solution speed and minimize the cost of electricity used by about 5.5% to 8.7% on the one hand, and on the other hand, it improves the solution accuracy, and at the same time effectively realizes the peak shaving and valley filling, which provides a proof of the effectiveness and feasibility of the new method.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of localized surface plasmon resonance-based refractive index sensor using optical fiber
Autorzy:
Yadav, Mukti
Kaler, R. S.
Tematy:
localized surface plasmon resonance
LSPR
multi-mode optical fibre
refractive index sensor
sensitivity
COMSOL Multiphysics
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/58970213.pdf  Link otwiera się w nowym oknie
Opis:
The paper proposes a design of a localized surface plasmon resonance-based refractive index sensor for the detection of a chemical compound availing unclad geometry of the optical fiber. The geometry is explored to analyze the sensing behavior and coupling phenomenon at the metal-dielectric interface. The finite element method (FEM) is applied numerically to evaluate the analytical change in the reflectance spectra of the fiber model by inoculating potassium nitrate compound. The resonance shift and reflectance of the surface plasmon resonance (SPR) signal obtained after the optimization of structural parameters enhance the sensing performance of the prototype. The sensor exhibits a maximum sensitivity of 80.2919 rad/RIU for a 1.56 high refractive index analyte and minimum sensitivity of 2.3446 rad/RIU for a 1.33 low refractive index analyte. The proposed sensor is modelled in such a way that it can be employed in various sensing applications for a wide range of refractive indices.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wind tunnel experiment of multi-mode arc sail device
Autorzy:
Zhang, Huawu
Hu, Yihuai
He, Jianhai
Tematy:
marine engineering
multi-mode arc sail device
wind tunnel test
sail-assisted navigation
wind power generation
Pokaż więcej
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:
https://bibliotekanauki.pl/articles/2033182.pdf  Link otwiera się w nowym oknie
Opis:
A ship’s wind energy utilization device with multi-mode arc-shaped sails is designed, which have different working modes for sail-assisting or wind power generation according to the ship’s navigation. The structural characteristics and working principles of this device are firstly described in this paper. Three sets of arc-shaped sails with different thickness (4.5 cm, 11.3 cm, 21.7 cm) were designed. Wind tunnel experiments were carried out in the respects of sail-assisting performance and wind-power generation to determine the best sail blade shape and to verify the energy-saving effect of this device. Experiments show that the sail with the smallest thickness (4.5 cm) has a better boosting effect than others, and the sail with the largest thickness (21.7 cm) has the best wind power generation performance. Considering the lateral force and the structural strength of the support, in the case of the comprehensive evaluation for the boosting and power generation performance, it is considered that the intermediate thickness (11.3 cm) is the best choice. The device has a good comprehensive energy utilization effect and has development and application value.
Dostawca treści:
Biblioteka Nauki
Artykuł

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