Electric propulsion for manned spaceflights of the future

1981 ◽  
Author(s):  
H. LOEB
Keyword(s):  
Electric Propulsion ◽  
The Future

scholarly journals Development of fully superconducting 5 MW aviation generator with liquid hydrogen cooling

2022 ◽  
pp. 62-73
Author(s):  
Dmitry Dezhin ◽  
Roman Ilyasov
Keyword(s):  
Electric Propulsion ◽  
Fem Simulation ◽  
Synchronous Generator ◽  
Liquid Hydrogen ◽  
Propulsion System ◽  
Moscow Aviation Institute ◽  
Cross Sectional ◽  
Electric Propulsion System ◽  
The Future ◽  
Hydrogen Cooling

The use of liquid hydrogen as a fuel will be inevitable in the aviation of the future. This statement means that manufacturers will also implement liquid hydrogen for cooling all superconducting aviation equipment of an electric propulsion system. The development of fully electric aircraft is the most promising solution in this case. Scientists from the Department of electrical machines and power electronics of Moscow aviation institute have conducted calculations and theoretical researches of critical specific mass-dimensional parameters (MW/ton and MW/m3 at 21 K) of fully superconducting aviation synchronous generator of the electric propulsion system. The results are in this article. The article discusses the results 3D finite element modeling (FEM) simulation of a 5 MW fully superconducting synchronous generator with combined excitation. Superconducting armature and axial excitation windings based on second generation high temperature superconductors (HTS-2G) are located on the stator, which makes it possible to contactlessness and the absence of sliding seals. A dry gap will reduce gas-dynamic losses and increase the nominal peripheral speed of the rotor. The use of liquid hydrogen as a coolant makes it possible to significantly increase the linear load of the generator, and high current densities to reduce the cross-sectional area of the coils, which will make it possible to place them in individual cryostats in the future. Individual cryostats will allow to remove the heat release of magnetic losses from the cryogenic zone and reduce the consumption of refrigerant. For the purpose of internal redundancy of the HTS coils, the machine has a complete set of reserve winding made of ultrapure aluminum, also cooled by liquid hydrogen. If the superconducting coils get out of the stand, the generator will provide 15 % power on standby

High-Power Electric Propulsion Enabling Support to the future Deep Space Gateway

2018 ◽  
Author(s):  
Martina Mammarella ◽  
Christopher A. Paissoni ◽  
Nicole Viola ◽  
Roberta Fusaro ◽  
Tommaso Andrenussi
Keyword(s):  
High Power ◽  
Electric Propulsion ◽  
Deep Space ◽  
The Future

Design of Risk Prediction Assessment for Ship-Integrated Electric Propulsion System

2021 ◽  
pp. 1-9
Author(s):  
Pengfei Zhi ◽  
Zhiyu Zhu ◽  
Wanlu Zhu ◽  
Haiyang Qiu
Keyword(s):  
Risk Assessment ◽  
Risk Prediction ◽  
Electric Propulsion ◽  
Internal Combustion Engines ◽  
Viterbi Algorithm ◽  
Propulsion System ◽  
Operating Conditions ◽  
Assessment System ◽  
Electric Propulsion System ◽  
The Future

A design of risk prediction assessment is proposed to improve the safety and economy of ship-integrated electric propulsion system(SIEPS). Firstly, the article puts forward a multihidden Markov model (MHMM)–Viterbi algorithm to predict fault state probabilities of each component in the continuous time points in the future. Secondly, according to the influence of dynamic ocean condition, the fault states of the components of SIEPS are predicted by using the MHMM–Viterbi algorithm. Thirdly, the risk assessment system of network topology of SIEPS is designed, and power flow analysis under the abnormal condition is repeatedly calculated by using the MonteCarlo simulation. Finally, the article takes a SIEPS as an example and the risk prediction assessment results is given. Introduction With the establishment of increasingly stringent standards by the International Maritime Organization in terms of ship emissions and the increasing scarcity of petroleum resources, electric propulsion systems are gradually replacing internal combustion engines, which will become the future direction of ship power development. Electric propulsion ships do have many advantages such as high efficiency, high automation, environmental protection, energy saving, and emission reduction. However, ship-integrated electric propulsion system(SIEPS) is also the soft underbelly of electric propulsion ships. First of all, the complexity of the external environment factors such as high humidity and high salinity of ships (especially marine vessels) under long-term operating conditions, and the coupling of electromagnetic, thermal, and vibration signals of SIEPS will increase the failure rate of electrical equipment, thereby increasing the risk of SIEPS. Secondly, for electric propulsion ships, the SIEPS risk is likely to lead to chain failure of important systems such as power, control, navigation, resulting in the ship. Equipment and even personnel cause irreparable damage, causing fatal damage to electric propulsion ships. Therefore, in order to improve the safety, reliability, and economy of electric propulsion ships, it is necessary to carry out research on relevant technologies for SIEPS risk assessment (Wen et al. 2012; Guangfu et al. 2013).

scholarly journals A Review on the Faults of Electric Machines Used in Electric Ships

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Dionysios V. Spyropoulos ◽  
Epaminondas D. Mitronikas
Keyword(s):  
Power System ◽  
Electric Power ◽  
Electric Propulsion ◽  
Electric Machines ◽  
Propulsion System ◽  
The Other ◽  
Reliable Operation ◽  
Propulsion Systems ◽  
The Future ◽  
Electrical Faults

Electric propulsion systems are today widely applied in modern ships, including transport ships and warships. The ship of the future will be fully electric, and not only its propulsion system but also all the other services will depend on electric power. The robust and reliable operation of the ship’s power system is essential. In this work, a review on the mechanical and electrical faults of electric machines that are used in electric ships is presented.

scholarly journals A Comprehensive Review of Atmosphere-Breathing Electric Propulsion Systems

2020 ◽  
Vol 2020 ◽  
pp. 1-21
Author(s):  
Peng Zheng ◽  
Jianjun Wu ◽  
Yu Zhang ◽  
Biqi Wu
Keyword(s):  
Electric Propulsion ◽  
Low Earth Orbit ◽  
Propulsion System ◽  
Earth Orbit ◽  
Space Propulsion ◽  
Propulsion Systems ◽  
Comprehensive Review ◽  
The Past ◽  
Atmospheric Molecules ◽  
The Future

To develop the satellites for a low-Earth-orbit environment, atmosphere-breathing electric propulsion (ABEP) systems have become more attractive to researchers in the past decade. The system can use atmospheric molecules as the propellant to provide thrust compensation, which can extend the lifetime of spacecraft (S/C). This comprehensive review reviews the efforts of previous researchers to develop concepts for ABEP systems. Different kinds of space propulsion system are analysed to determine the suitable propulsion for atmosphere-breathing S/C. Further discussion about ABEP systems shows the characteristic of different thrusters. The main performance of the ABEP system of previous studies is summarized, which provides further research avenues in the future. Results show great potential for thrust compensation from atmospheric molecules. However, the current studies show various limitations and are difficult to apply to space. The development of ABEP needs to solve some problems, such as the intake efficiency, ionization power, and electrode corrosion.

The future use of European Electric Propulsion by ESA

1976 ◽  
Author(s):  
H. PFEFFER ◽  
C. ROSETTI ◽  
E. SLACHMUYLDERS
Keyword(s):  
Electric Propulsion ◽  
The Future

International determination of the total motion of the pole

1961 ◽  
Vol 13 ◽  
pp. 29-41
Author(s):  
Wm. Markowitz
Keyword(s):  
Secular Motion ◽  
The Future

A symposium on the future of the International Latitude Service (I. L. S.) is to be held in Helsinki in July 1960. My report for the symposium consists of two parts. Part I, denoded (Mk I) was published [1] earlier in 1960 under the title “Latitude and Longitude, and the Secular Motion of the Pole”. Part II is the present paper, denoded (Mk II).

Status of the Lick Proper Motion Program

1978 ◽  
Vol 48 ◽  
pp. 387-388
Author(s):  
A. R. Klemola
Keyword(s):  
Proper Motion ◽  
The Future

Second-epoch photographs have now been obtained for nearly 850 of the 1246 fields of the proper motion program with centers at declination -20° and northwards. For the sky at 0° and northward only 130 fields remain to be taken in the next year or two. The 270 southern fields with centers at -5° to -20° remain for the future.

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