A Study of Two Variable Cycle Engine Concepts for High Speed Civil Aircraft

2021 ◽  
Author(s):  
Jiyuan Zhang ◽  
Min Chen ◽  
Hailong Tang ◽  
Xin Liu
Keyword(s):  
High Speed ◽  
Civil Aircraft

Design and Analysis of AFDX Network Based High-Speed Avionics System of Civil Aircraft

2012 ◽  
Vol 462 ◽  
pp. 445-451 ◽  
Author(s):  
Hong Chun Wang ◽  
Wen Sheng Niu
Keyword(s):  
Real Time ◽  
High Speed ◽  
Data Communication ◽  
Full Duplex ◽  
System Construction ◽  
Real Time System ◽  
Redundancy Management ◽  
Target Architecture ◽  
Civil Aircraft ◽  
Host Target

Avionics Full Duplex Switched Ethernet (AFDX) standardized as ARINC 664 is a major upgrade for integrated avionics systems of civil aircraft. It becomes the current communication technology in the context of avionics and provides a backbone network for the civil avionics system. This paper focuses on features of AFDX network protocol. Architecture of AFDX switch based on shared memory is proposed to meet the requirements of avionics real-time system. In addition, frame filtering, traffic policing and frame schedule function are used to eliminate uncertainties in huge traffic flows. End System (ES) host-target architecture is also researched in this paper. Virtual link scheduler, redundancy management, and protocol stack in ES are designed to ensure determinism and reliability of data communication. AFDX switch and ES have been successfully developed, and configuration tool, ARINC 615A loader and simulation tool related to AFDX network are also provided as package solution to support avionics system construction. Finally, AFDX switch and ESes have passed ARINC 664 protocol conformance test and certification, the test results show that our AFDX products meet the requirements of real-time communication, determinism and reliability defined in ARINC 664

Matching engine and aircraft lapse rates for high speed civil aircraft

1996 ◽  
Vol 33 (1) ◽  
pp. 61-67 ◽  
Author(s):  
C. R. Salay ◽  
D. W. Elliott
Keyword(s):  
High Speed ◽  
Civil Aircraft ◽  
Lapse Rates

Neural Network and Regression Approximations in High-Speed Civil Aircraft Design Optimization

1998 ◽  
Vol 35 (6) ◽  
pp. 839-850 ◽  
Author(s):  
Surya N. Patnaik ◽  
James D. Guptill ◽  
Dale A. Hopkins ◽  
Thomas M. Lavelle
Keyword(s):  
Neural Network ◽  
Design Optimization ◽  
High Speed ◽  
Aircraft Design ◽  
Civil Aircraft

A Study of Two Variable Cycle Engine Concepts for High Speed Civil Aircraft

2020 ◽  
Author(s):  
Jiyuan Zhang ◽  
Min Chen ◽  
Hailong Tang ◽  
Xin Liu
Keyword(s):  
High Speed ◽  
Engine Performance ◽  
Propulsion System ◽  
Parameter Determination ◽  
Control Law ◽  
Performance Requirement ◽  
Civil Aircraft ◽  
Matching Mechanism ◽  
Aircraft Propulsion System ◽  
Cycle Parameter

Abstract High speed civil aircraft has become a promising field with the development of globalization. The propulsion system is an indispensable part of the aircraft. Conventional engines have difficulty meeting the performance requirement of the high-speed civil aircraft. In this article, two variable cycle engines were studied to preliminarily as aircraft propulsion system. Their performance and matching mechanism were analyzed and compared with each other. Firstly, the cycle parameters design was conducted to explain the principle of cycle parameter determination for the high-speed civil aircraft. Secondly, the control law of variable geometry components was studied to optimize engine performance during supersonic cruising. Finally, the throttling process with constant airflow was studied to solve the problem of thrust surplus during subsonic cruising. According to this study, given same cycle parameters, the engine with variable fan stage can produce equal or slightly higher thrust with slightly less fuel consumption than the engine with core-driven-fan stage. The engine with core-driven-fan stage has advantages in aero-dynamical stabilities. It can also throttle to slightly lower thrust level during subsonic cruising. Considering the advantages in performance and derived development comprehensively, the engine with variable fan stage is a better option for high speed civil aircraft.

scholarly journals Perspectives of practical realization of the transport system «Monojet»

2016 ◽  
Vol 2 (4) ◽  
pp. 15-24
Author(s):  
Evgeniya A Milovanova ◽  
Irina A Lyubchenko ◽  
Alexei I Milovanov
Keyword(s):  
Transport System ◽  
Technological Progress ◽  
High Speed ◽  
Far East ◽  
Raw Material ◽  
Transport Systems ◽  
Transport Services ◽  
The Far East ◽  
Civil Aircraft ◽  
Design Ideas

As transport system «Monojet» includes design ideas in the field of development of over ground suspended transport systems it will allow: - to master effectively vital space of Siberia, the Far East and North of the country; - to strengthen defence potential of the country: to create the network of defence objects connected by the transport system including high speed and lifting mobile means of military technique and troops delivery; - to revive native aircraft vehicles which are not in operation now and to stimulate the building of native civil aircraft construction; - to create possibilities for innovations in the field of science and technique; to ensure technological progress in order to solve the import replacing tasks; - to change in the world public opinion the reputation of the country as supplier of raw material proposing transport services ( to counterbalance, for example, Chinese «Silk Road») and new transport means for civil purposes; - to contribute to the growth and strengthening of patriotism and to provide the rising generation with fair working activity in the future by stimulating motivation of the youth technical creation.

Microfabrication research at the National Submicron Facility

1983 ◽  
Vol 41 ◽  
pp. 86-89
Author(s):  
E.D. Wolf
Keyword(s):  
Integrated Circuits ◽  
Particle Physics ◽  
High Speed ◽  
New Technology ◽  
High Energy ◽  
High Energy Particle ◽  
New Science ◽  
Wide Range ◽  
Intermediate Domain ◽  
Circuit Function

Most microelectronics devices and circuits operate faster, consume less power, execute more functions and cost less per circuit function when the feature-sizes internal to the devices and circuits are made smaller. This is part of the stimulus for the Very High-Speed Integrated Circuits (VHSIC) program. There is also a need for smaller, more sensitive sensors in a wide range of disciplines that includes electrochemistry, neurophysiology and ultra-high pressure solid state research. There is often fundamental new science (and sometimes new technology) to be revealed (and used) when a basic parameter such as size is extended to new dimensions, as is evident at the two extremes of smallness and largeness, high energy particle physics and cosmology, respectively. However, there is also a very important intermediate domain of size that spans from the diameter of a small cluster of atoms up to near one micrometer which may also have just as profound effects on society as “big” physics.

Vacuum System to Minimize the Specimen Contamination of High-Performance EM

1977 ◽  
Vol 35 ◽  
pp. 68-69
Author(s):  
N. Yoshimura ◽  
K. Shirota ◽  
T. Etoh
Keyword(s):  
Electron Microscope ◽  
High Speed ◽  
High Performance ◽  
High Vacuum ◽  
Vacuum System ◽  
Pump System ◽  
Pumping System ◽  
Diffusion Pump ◽  
Almost All ◽  
Cascade Type

One of the most important requirements for a high-performance EM, especially an analytical EM using a fine beam probe, is to prevent specimen contamination by providing a clean high vacuum in the vicinity of the specimen. However, in almost all commercial EMs, the pressure in the vicinity of the specimen under observation is usually more than ten times higher than the pressure measured at the punping line. The EM column inevitably requires the use of greased Viton O-rings for fine movement, and specimens and films need to be exchanged frequently and several attachments may also be exchanged. For these reasons, a high speed pumping system, as well as a clean vacuum system, is now required. A newly developed electron microscope, the JEM-100CX features clean high vacuum in the vicinity of the specimen, realized by the use of a CASCADE type diffusion pump system which has been essentially improved over its predeces- sorD employed on the JEM-100C.

The on-line use of histogram data for high-speed correction and alignment of electron microscope images

1984 ◽  
Vol 42 ◽  
pp. 556-557
Author(s):  
William Krakow
Keyword(s):  
Power Spectrum ◽  
High Speed ◽  
Direct Memory Access ◽  
Digital Television ◽  
Contrast Transfer Function ◽  
The Past ◽  
High Resolution Tem ◽  
On Line ◽  
Correction Of Astigmatism ◽  
The Fourier Transform

In the past few years on-line digital television frame store devices coupled to computers have been employed to attempt to measure the microscope parameters of defocus and astigmatism. The ultimate goal of such tasks is to fully adjust the operating parameters of the microscope and obtain an optimum image for viewing in terms of its information content. The initial approach to this problem, for high resolution TEM imaging, was to obtain the power spectrum from the Fourier transform of an image, find the contrast transfer function oscillation maxima, and subsequently correct the image. This technique requires a fast computer, a direct memory access device and even an array processor to accomplish these tasks on limited size arrays in a few seconds per image. It is not clear that the power spectrum could be used for more than defocus correction since the correction of astigmatism is a formidable problem of pattern recognition.

Structural changes in silicon-on-insulator material during post-implantation annealing

1986 ◽  
Vol 44 ◽  
pp. 736-737
Author(s):  
C. O. Jung ◽  
S. J. Krause ◽  
S.R. Wilson
Keyword(s):  
Integrated Circuits ◽  
Oxide Layer ◽  
High Speed ◽  
Structural Changes ◽  
Device Fabrication ◽  
Silicon On Insulator ◽  
High Quality ◽  
Radiation Hardened ◽  
Post Implantation ◽  
Very High

Silicon-on-insulator (SOI) structures have excellent potential for future use in radiation hardened and high speed integrated circuits. For device fabrication in SOI material a high quality superficial Si layer above a buried oxide layer is required. Recently, Celler et al. reported that post-implantation annealing of oxygen implanted SOI at very high temperatures would eliminate virtually all defects and precipiates in the superficial Si layer. In this work we are reporting on the effect of three different post implantation annealing cycles on the structure of oxygen implanted SOI samples which were implanted under the same conditions.

An atomic-resolution microscope study of Al contracts on GaAs

1986 ◽  
Vol 44 ◽  
pp. 726-727
Author(s):  
Z. Liliental-Weber ◽  
C. Nelson ◽  
R. Ludeke ◽  
R. Gronsky ◽  
J. Washburn
Keyword(s):  
High Speed ◽  
Schottky Contacts ◽  
Detailed Knowledge ◽  
The Past ◽  
Semiconductor Interfaces ◽  
Deposited Metal ◽  
Microwave Applications ◽  
Free Interfaces ◽  
Potential Use

The properties of metal/semiconductor interfaces have received considerable attention over the past few years, and the Al/GaAs system is of special interest because of its potential use in high-speed logic integrated optics, and microwave applications. For such materials a detailed knowledge of the geometric and electronic structure of the interface is fundamental to an understanding of the electrical properties of the contact. It is well known that the properties of Schottky contacts are established within a few atomic layers of the deposited metal. Therefore surface contamination can play a significant role. A method for fabricating contamination-free interfaces is absolutely necessary for reproducible properties, and molecularbeam epitaxy (MBE) offers such advantages for in-situ metal deposition under UHV conditions

Sign in / Sign up

Export Citation Format

Share Document