Jet Engines – The New Masters of Advanced Flight Control

2018 ◽  
Vol 35 (2) ◽  
pp. 95-99
Author(s):  
Benjamin Gal-Or
Keyword(s):  
Flight Control ◽  
A Priori ◽  
Integrated Design ◽  
Flight Safety ◽  
United States Congress ◽  
Jet Engines ◽  
Jet Engine ◽  
The People ◽  
Air Combat ◽  
Selection Of

Abstract ANTICIPATED UNITED STATES CONGRESS ACT should lead to reversing a neglected duty to the people by supporting FAA induced bill to civilize classified military air combat technology to maximize flight safety of airliners and cargo jet transports, in addition to FAA certifying pilots to master Jet-Engine Steering (“JES”) as automatic or pilot recovery when Traditional Aerodynamic-only Flight Control (“TAFC”) fails to prevent a crash and other related damages [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42]. Replacement of propeller driven air vehicles with jet engines marks the first jet-engine historical revolution. Yet designers of TAFC still a priori arrest jet engines to provide only brute force forward – a practice leading to wrong freezing of wings, tails, canards, landing gear, airframe and avionics prior to selection of off-the-shelf jet engine to fit that non-integrated design. A second jet-engine revolution is currently in. It originated by failures of TAFC to function and prevent catastrophes especially in post-stall flight domains, takeoff and landing, which mark the JES-Revolution. Full scale JES implementation started in 1986 in the U.S. by YF-22 design [24, 31, 32, 33, 34]. Three years later the YF-22 prototype was selected over the YF-23 that lacked IPA-78402 JES Technologies [31] like 60+ to 1 kill-ratio advantage during WVR air combat – a revolution gradually followed by RUSSIA, CHINA, INDIA, JAPAN and South KOREA [20, 21, 28]. Civilizing JES to maximize future passengers flight safety by preventing various airlines catastrophes [8] had been successfully first flight tested by a subscale JES-Boeing-727 under U.S. FAA support [8, 25]. Pro and cons of military vs. civil JES-technologies are presented by this editorial.

Modified Jet Engine Application for Industrial Drives in the Libyan Desert

1973 ◽  
Author(s):  
D. A. Greenberg ◽  
W. R. Bohannan
Keyword(s):  
Gas Turbines ◽  
Gas Injection ◽  
Sahara Desert ◽  
Jet Engines ◽  
Jet Engine ◽  
Expansion Turbine ◽  
Shaft Power ◽  
Single Jet ◽  
Libyan Desert ◽  
Selection Of

Gas turbines utilizing modified aircraft jet engines are successfully providing shaft power for three vital services in oil production operations in the Libyan Sahara Desert. Each of three trains of high-pressure compressors in gas injection service is powered by twin jet engines exhausting to a double-flow double-ended expansion turbine. Packaged single jet engine/expander combinations are the drivers for two low-pressure gas compressor trains in the LPG plants and for three electric generators. The remote location placed heavy emphasis on reliability and ease of maintenance in the selection of this equipment. This machinery has demonstrated its ability to perform satisfactorily under the punishing conditions required by these operations.

Flight Characteristic Analysis of Fighter Aircrafts with Twin Jet Engines under the Asymmetric Thrust

2014 ◽  
Vol 574 ◽  
pp. 307-310
Author(s):  
Feng Bo Han ◽  
Zong Jie Cao ◽  
Bai Song Chen ◽  
Xiu Ling Wei
Keyword(s):  
Dynamic Characteristic ◽  
Flight Speed ◽  
Control Action ◽  
Flight Safety ◽  
Actual Situation ◽  
Jet Engines ◽  
Characteristic Analysis ◽  
Jet Engine

Abstract:When one side jet engine of the twin jet engines in aircrafts fails, the aircrafts will sideslip relative to y-axis of aircrafts. The nose of the aircrafts will drop and the flight speed of the aircrafts will decrease. In order to maintain the balance of the aircrafts to ensure the safety of flight, the pilot has to carefully manipulate the aircrafts according to the actual situation and the control action. In this paper, dynamic characteristic of the aircrafts with twin jet engines under asymmetric thrust of aircrafts has been analyzed. Several manipulation methods of aircrafts with both the sideslip and bank were discussed to guarantee flight safety of aircrafts with asymmetric thrust. The control measurements to keep the balances of aircrafts were given to manipulate the aircrafts. In this situation, aircrafts will turn back as soon as possible and land at the nearest airport.

Innovative Approach to Information Search by Example of a Patent Analysis of an Important Substitution Plan

2020 ◽  
pp. 143-157
Author(s):  
Maria A. Milkova
Keyword(s):  
Information Search ◽  
Topic Modeling ◽  
Cognitive Biases ◽  
A Priori ◽  
Import Substitution ◽  
Innovative Approach ◽  
Iterative Search ◽  
Comprehensive Picture ◽  
Priori Information ◽  
Selection Of

Nowadays the process of information accumulation is so rapid that the concept of the usual iterative search requires revision. Being in the world of oversaturated information in order to comprehensively cover and analyze the problem under study, it is necessary to make high demands on the search methods. An innovative approach to search should flexibly take into account the large amount of already accumulated knowledge and a priori requirements for results. The results, in turn, should immediately provide a roadmap of the direction being studied with the possibility of as much detail as possible. The approach to search based on topic modeling, the so-called topic search, allows you to take into account all these requirements and thereby streamline the nature of working with information, increase the efficiency of knowledge production, avoid cognitive biases in the perception of information, which is important both on micro and macro level. In order to demonstrate an example of applying topic search, the article considers the task of analyzing an import substitution program based on patent data. The program includes plans for 22 industries and contains more than 1,500 products and technologies for the proposed import substitution. The use of patent search based on topic modeling allows to search immediately by the blocks of a priori information – terms of industrial plans for import substitution and at the output get a selection of relevant documents for each of the industries. This approach allows not only to provide a comprehensive picture of the effectiveness of the program as a whole, but also to visually obtain more detailed information about which groups of products and technologies have been patented.

scholarly journals Incorporating radiomics into clinical trials: expert consensus on considerations for data-driven compared to biologically driven quantitative biomarkers

2021 ◽  
Author(s):  
Laure Fournier ◽  
Lena Costaridou ◽  
Luc Bidaut ◽  
Nicolas Michoux ◽  
Frederic E. Lecouvet ◽  
...  
Keyword(s):  
Clinical Trials ◽  
Quantitative Imaging ◽  
A Priori ◽  
External Validation ◽  
Data Driven ◽  
Imaging Biomarkers ◽  
Clinical Validation ◽  
Biological Processes ◽  
Imaging Data ◽  
Selection Of

Abstract Existing quantitative imaging biomarkers (QIBs) are associated with known biological tissue characteristics and follow a well-understood path of technical, biological and clinical validation before incorporation into clinical trials. In radiomics, novel data-driven processes extract numerous visually imperceptible statistical features from the imaging data with no a priori assumptions on their correlation with biological processes. The selection of relevant features (radiomic signature) and incorporation into clinical trials therefore requires additional considerations to ensure meaningful imaging endpoints. Also, the number of radiomic features tested means that power calculations would result in sample sizes impossible to achieve within clinical trials. This article examines how the process of standardising and validating data-driven imaging biomarkers differs from those based on biological associations. Radiomic signatures are best developed initially on datasets that represent diversity of acquisition protocols as well as diversity of disease and of normal findings, rather than within clinical trials with standardised and optimised protocols as this would risk the selection of radiomic features being linked to the imaging process rather than the pathology. Normalisation through discretisation and feature harmonisation are essential pre-processing steps. Biological correlation may be performed after the technical and clinical validity of a radiomic signature is established, but is not mandatory. Feature selection may be part of discovery within a radiomics-specific trial or represent exploratory endpoints within an established trial; a previously validated radiomic signature may even be used as a primary/secondary endpoint, particularly if associations are demonstrated with specific biological processes and pathways being targeted within clinical trials. Key Points • Data-driven processes like radiomics risk false discoveries due to high-dimensionality of the dataset compared to sample size, making adequate diversity of the data, cross-validation and external validation essential to mitigate the risks of spurious associations and overfitting. • Use of radiomic signatures within clinical trials requires multistep standardisation of image acquisition, image analysis and data mining processes. • Biological correlation may be established after clinical validation but is not mandatory.

scholarly journals Love and homophobia in Malawi's spoken-word poetry movement

Africa ◽  
2021 ◽  
Vol 91 (3) ◽  
pp. 361-387
Author(s):  
Harri Englund
Keyword(s):  
Gender Stereotypes ◽  
Gender Relations ◽  
Spoken Word ◽  
The Internet ◽  
Modern Poetry ◽  
Spoken Word Poetry ◽  
The People ◽  
Popular Interest ◽  
The Aesthetic ◽  
Selection Of

AbstractBy the early 2010s, a number of Malawian poets in their twenties had begun to substitute the elliptical expression of earlier generations with a language that resonated with popular idioms. As poetry directed at ‘the people’, its medium is spoken word rather than print, performed to live audiences and distributed through CDs, radio programmes and the internet. Crafted predominantly in Chichewa, the poems also address topics of popular interest. The selection of poetry presented here comes from a female and a male poet, who, unbeknown to each other, prepared poems sharply critical of homosexuality and what they regarded as its foreign and local advocacy. The same poets have also gained success for their love poems, which have depicted intimate desires in remarkably compatible ways for both women and men. The poets who performed ‘homophobic’ verse went against popular gender stereotypes in their depictions of romantic love and female and male desires. This introductory essay, as a contribution toAfrica's Local Intellectuals series, discusses the aesthetic challenges that the new poets have launched in the context of Malawi's modern poetry. With regard to gender relations in their love poems, the introduction also considers the poets’ possible countercultural contribution despite their avowed commitment to perform for ‘the people’.

Practical Bypass Mixing Systems for Fan Jet Aero Engines

1966 ◽  
Vol 17 (2) ◽  
pp. 141-160 ◽  
Author(s):  
T. H. Frost
Keyword(s):  
Gas Turbines ◽  
Minimum Weight ◽  
Jet Engines ◽  
Metal Interface ◽  
Combustion Chambers ◽  
Propulsion Systems ◽  
Jet Engine ◽  
Aero Engines ◽  
Corrugated Metal ◽  
Constant Static Pressure

SummaryMixing systems have many applications in gas turbines and aircraft jet propulsion, e.g. mixing zones in combustion chambers, ejectors for jet lift thrust augmentors and supersonic propulsion systems. A further application similar to that of combustion chamber mixing is that of mixing the cold and hot exhausts of a bypass jet engine. These are both characterised by mixing at constant static pressure and approximately constant total pressure as opposed to the more general case of unequal pressures in ejector systems (Fig. 1).The exhaust mixing process as used in Rolls-Royce bypass jet engines, e.g. Spey and Conway, enables the potential of the bypass principle, in terms of minimum weight and fuel consumption, to be exploited by a simple practical device.This is achieved by mixing the two streams in a common duct of fairly short dimensions with a corrugated metal interface on the inlet side. The consideration of these practical systems forms the main topic of this paper.

Machine vision-based sensing for helicopter flight control

Robotica ◽  
2000 ◽  
Vol 18 (3) ◽  
pp. 299-303 ◽  
Author(s):  
Carl-Henrik Oertel
Keyword(s):  
Machine Vision ◽  
Measurement System ◽  
Flight Control ◽  
A Priori ◽  
Image Data ◽  
Two Dimensional ◽  
Position Measurement ◽  
Additional Information ◽  
Helicopter Flight ◽  
Template Tracking

Machine vision-based sensing enables automatic hover stabilization of helicopters. The evaluation of image data, which is produced by a camera looking straight to the ground, results in a drift free autonomous on-board position measurement system. No additional information about the appearance of the scenery seen by the camera (e.g. landmarks) is needed. The technique being applied is a combination of the 4D-approach with two dimensional template tracking of a priori unknown features.

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