scholarly journals Helicopter Flight Manoeuvre Statistics via ADS-B: An Initial Investigation Using the OpenSky Network

2021 ◽  
Vol 13 (1) ◽  
pp. 10
Author(s):  
Joshua Hoole ◽  
Julian Booker ◽  
Jonathan Cooper
Keyword(s):  
Rule Based ◽  
Initial Investigation ◽  
Significant Variability ◽  
Helicopter Flight ◽  
Wide Range ◽  
Low Altitude

Significant challenges exist when defining the usage spectra of helicopter components due to the wide range of missions and manoeuvres flown by helicopters in-service. Automatic Dependent Surveillance-Broadcast (ADS-B) trajectories provide a means of constructing helicopter flight manoeuvre statistics across entire in-service fleets. This paper explores the feasibility of characterising helicopter manoeuvres by applying rule-based algorithms to ADS-B trajectories from a fleet of twin-seat training helicopters. Despite challenges relating to low-altitude ADS-B coverage, a comprehensive set of flight manoeuvre statistics was generated, which highlighted that significant variability exists in helicopter flight manoeuvre occurrences. The generated statistics can also support validation activities concerning design usage spectra assumptions.

scholarly journals Development of a Hybrid Electric Vehicle Simulation Tool with a Rule-Based Topology

2021 ◽  
Vol 11 (23) ◽  
pp. 11319
Author(s):  
Hyun Woo Won
Keyword(s):  
Hybrid Electric Vehicle ◽  
Hybrid Simulation ◽  
Rule Base ◽  
Simulation Tool ◽  
Control Logic ◽  
Rule Based ◽  
Vehicle Simulation ◽  
Wide Range ◽  
Hybrid Electric ◽  
And Control

The performance of hybrid electric vehicles (HEVs) greatly depends on the various sub-system components and their architecture, and designers need comprehensive reviews of HEVs before vehicle investigation and manufacturing. Simulations facilitate development of virtual prototypes that make it possible to rapidly see the effects of design modifications, avoiding the need to manufacture multiple expensive physical prototypes. To achieve the required levels of emissions and hardware costs, designers must use control strategies and tools such as computational modeling and optimization. However, most hybrid simulation tools do not share their principles and control logic algorithms in the open literature. With this motivation, the author developed a hybrid simulation tool with a rule-based topology. The major advantage of this tool is enhanced flexibility to choose different control and energy management strategies, enabling the user to explore a wide range of hybrid topologies. The tool provides the user with the ability to modify any sub-system according to one’s own requirements. In addition, the author introduces a simple logic control for a rule-base strategy as an example to show the flexibility of the tool in allowing the adaptation of any logic algorithm by the user. The results match the experimental data quite well. Details regarding modeling principle and control logic are provided for the user’s benefit.

scholarly journals Internet of Unmanned Aerial Vehicles—A Multilayer Low-Altitude Airspace Model for Distributed UAV Traffic Management

Sensors ◽  
2019 ◽  
Vol 19 (21) ◽  
pp. 4779 ◽  
Author(s):  
Nader S. Labib ◽  
Grégoire Danoy ◽  
Jedrzej Musial ◽  
Matthias R. Brust ◽  
Pascal Bouvry
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Traffic Management ◽  
Complex Problem ◽  
Experimental Simulation ◽  
Aerial Vehicles ◽  
Safe Management ◽  
Wide Range ◽  
Abstract Level ◽  
Low Altitude ◽  
New Research

The rapid adoption of Internet of Things (IoT) has encouraged the integration of new connected devices such as Unmanned Aerial Vehicles (UAVs) to the ubiquitous network. UAVs promise a pragmatic solution to the limitations of existing terrestrial IoT infrastructure as well as bring new means of delivering IoT services through a wide range of applications. Owning to their potential, UAVs are expected to soon dominate the low-altitude airspace over populated cities. This introduces new research challenges such as the safe management of UAVs operation under high traffic demands. This paper proposes a novel way of structuring the uncontrolled, low-altitude airspace, with the aim of addressing the complex problem of UAV traffic management at an abstract level. The work, hence, introduces a model of the airspace as a weighted multilayer network of nodes and airways and presents a set of experimental simulation results using three UAV traffic management heuristics.

Research of Methodological Errors of the Air Data System of Aircraft with Stationary Included Receiver of Incoming Air Flow

2019 ◽  
Vol 20 (8) ◽  
pp. 504-512 ◽  
Author(s):  
V. M. Soldatkin ◽  
V. V. Soldatkin
Keyword(s):  
Measuring System ◽  
Competitive Advantages ◽  
Main Rotor ◽  
Helicopter Flight ◽  
Functional Scheme ◽  
Wide Range ◽  
Means Of Measurement ◽  
Methodological Errors ◽  
Parking Lot ◽  
Parameters Measurement

It is shown that the known limitations on the measurement of air parameters on board the helicopter due to significant aerodynamic disturbances introduced by inductive flows of vortex column of main rotor. This determines the need to create the means of measurement, taking into account the aerodynamics and dynamics of the helicopter flight. The known direction of overcoming these limitations is the use for measuring the information of aerodynamic field of vortex column of main rotor and its perception by means of the stationary multi-functional aerometric receiver. However, the need to protect a large number of full-pressure tubes installed in the flow channel of the multifunctional aerometric receiver, strict requirements for the identity and stability of the characteristics of the large number aerometric channels, complicate the design, reduce reliability, increase cost, inhibit the use of the air parameters measurement system on helicopters of various classes and purposes. Principles of construction, functional scheme, features of perception of primary information of measuring system of air parameters of the helicopter with the stationary receiver of a stream, ion-label and aerometric measuring channels are showed. Algorithms for processing primary information at various stages and flight modes, including: in the parking lot before the launch of the power plant and when rotating the rotor, when taxiing and maneuvering on the earth’s surface, on takeoff and landing modes and when flying at low speeds, at flight speeds, when the stationary receiver of primary information leaves the zone of the vortex column of the rotor using ion-label and aerometric measuring channels, are presented. It is shown that the proposed approaches to the construction, models and algorithms for processing the primary information of the measuring system air parameters of helicopter with ion-label and aerometric measurement channels allow to determine the speed and direction of the wind vector, altitude-velocity parameters of motion relative to the environment and atmospheric parameters in a wide range of helicopter operation, which determines its competitive advantages in solving problems of piloting and provide the flight safety of helicopters of different classes and purposes.

Réduction de Complétive à un Nom et Article Défini Générique

1993 ◽  
Vol 17 (1) ◽  
pp. 83-97
Author(s):  
Mehryar Mohri
Keyword(s):  
Reduced Form ◽  
Definite Article ◽  
Rule Based ◽  
Syntactic Rule ◽  
Real Issue ◽  
Wide Range ◽  
Definite Articles

The description of the conditions under which generic definite articles appear in the sentences of French is a real issue. We present here a simple syntactic rule, based on the theory of support verbs (Z. Harris 1968, M. Gross 1975), which accounts for the appearance of these articles in a particular set of sentences. In these sentences, the generic article is followed by a noun which can be associated with a support verb, and be replaced by a sentential complement of the type que S (that S). We first briefly describe a transformation which relates this sentential complement to its reduced form of simple noun. We then indicate a rule which consists in erasing the preposition de while applying this transformation. Various examples of sentences are shown in order to illustrate the wide range of application of the proposed rule. We also extend this rule to the case of sentences in which a generic definite article precedes a noun non linked with a support verb, and discuss the additional conditions required.

scholarly journals CIRRUS REMOVAL IN MULTISPECTRAL DATAWITHOUT 1.38μM SPECTRAL DATA

2016 ◽  
Vol III-7 ◽  
pp. 41-44
Author(s):  
Aliaksei Makarau ◽  
Rudolf Richter ◽  
Viktoria Zekoll ◽  
Peter Reinartz
Keyword(s):  
Additive Model ◽  
Optical Data ◽  
Landsat 8 ◽  
Cirrus Cloud ◽  
Landsat 8 Oli ◽  
Spectral Channel ◽  
Wide Range ◽  
Low Altitude ◽  
Spectral Channels ◽  
Sentinel 2

Cirrus is one of the most common artifacts in the remotely sensed optical data. Contrary to the low altitude (1-3 km) cloud the cirrus cloud (8-20 km) is semitransparent and the extinction (cirrus influence) of the upward reflected solar radiance can be compensated. The widely employed and almost ’de-facto’ method for cirrus compensation is based on the 1.38μm spectral channel measuring the upwelling radiance reflected by the cirrus cloud. The knowledge on the cirrus spatial distribution allows to estimate the per spectral channel cirrus attenuation and to compensate the spectral channels. A wide range of existing and expected sensors have no 1.38μm spectral channel. These sensors data can be corrected by the recently developed haze/cirrus removal method. The additive model of the estimated cirrus thickness map (CTM) is applicable for cirrus-conditioned extinction compensation. Numeric and statistic evaluation of the CTM-based cirrus removal on more than 80 Landsat-8 OLI and 30 Sentinel-2 scenes demonstrates a close agreement with the 1.38μm channel based cirrus removal.

COMBINING ADABOOST WITH PREPROCESSING ALGORITHMS FOR EXTRACTING FUZZY RULES FROM LOW QUALITY DATA IN POSSIBLY IMBALANCED PROBLEMS

2012 ◽  
Vol 20 (supp02) ◽  
pp. 51-71 ◽  
Author(s):  
ANA PALACIOS ◽  
LUCIANO SANCHEZ ◽  
INES COUSO
Keyword(s):  
Real World ◽  
Binary Classification ◽  
Fuzzy Rule ◽  
Fuzzy Rules ◽  
Quality Data ◽  
Classification Problems ◽  
Rule Based ◽  
Adaboost Algorithm ◽  
Wide Range ◽  
Real World Problems

An extension of the Adaboost algorithm for obtaining fuzzy rule-based systems from low quality data is combined with preprocessing algorithms for equalizing imbalanced datasets. With the help of synthetic and real-world problems, it is shown that the performance of the Adaboost algorithm is degraded in presence of a moderate uncertainty in either the input or the output values. It is also established that a preprocessing stage improves the accuracy of the classifier in a wide range of binary classification problems, including those whose imbalance ratio is uncertain.

scholarly journals CIRRUS REMOVAL IN MULTISPECTRAL DATAWITHOUT 1.38μM SPECTRAL DATA

2016 ◽  
Vol III-7 ◽  
pp. 41-44
Author(s):  
Aliaksei Makarau ◽  
Rudolf Richter ◽  
Viktoria Zekoll ◽  
Peter Reinartz
Keyword(s):  
Additive Model ◽  
Optical Data ◽  
Landsat 8 ◽  
Cirrus Cloud ◽  
Landsat 8 Oli ◽  
Spectral Channel ◽  
Wide Range ◽  
Low Altitude ◽  
Spectral Channels ◽  
Sentinel 2

Cirrus is one of the most common artifacts in the remotely sensed optical data. Contrary to the low altitude (1-3 km) cloud the cirrus cloud (8-20 km) is semitransparent and the extinction (cirrus influence) of the upward reflected solar radiance can be compensated. The widely employed and almost ’de-facto’ method for cirrus compensation is based on the 1.38μm spectral channel measuring the upwelling radiance reflected by the cirrus cloud. The knowledge on the cirrus spatial distribution allows to estimate the per spectral channel cirrus attenuation and to compensate the spectral channels. A wide range of existing and expected sensors have no 1.38μm spectral channel. These sensors data can be corrected by the recently developed haze/cirrus removal method. The additive model of the estimated cirrus thickness map (CTM) is applicable for cirrus-conditioned extinction compensation. Numeric and statistic evaluation of the CTM-based cirrus removal on more than 80 Landsat-8 OLI and 30 Sentinel-2 scenes demonstrates a close agreement with the 1.38μm channel based cirrus removal.

scholarly journals Research on the Physico-Chemical Properties of Soils Locality Dobrosloveni, Olt County for Sustainable Agriculture

2021 ◽  
Vol 9 (2) ◽  
pp. 8
Author(s):  
Anca-Luiza Stănilă
Keyword(s):  
Environmental Factors ◽  
Soil Cover ◽  
Chemical Properties ◽  
Hydrological Regime ◽  
Physico Chemical ◽  
Wide Range ◽  
Low Altitude ◽  
Chemical Properties Of Soils ◽  
Direct Reflection ◽  
Pedogenetic Processes

The studied territory located in the central-western part of Olt County, belongs to the Caracal Plain and extremely little in the Leu-Rotunda Field in the SW part, both as divisions of the Romanati Plain.Locality presents a predominant relief of plain low altitude that is characterized by alluvio-proluvial plains moderately fragmented with local terraces, covered with loess-like deposit but relief of saucer.The soil cover of the territory under study is the direct reflection of all environmental factors, each having a role in the pedogenetic processes. Climate, as a pedogenetic factor, acted by its components, namely: temperature, precipitation, evapotranspiration, global radiation.Forest steppe vegetation was the supply of organic matter and biomass, because the hydrological regime is deficient, but especially the lithological substrate (loess-like complex) to steer solification to types characteristic of the cernisols class.Under the influence of environmental factors and pedogenetic processes within the locality Dobrosloveni it formed a wide range of soils, namely: protisols, cernisols, luvisols and hydrisols.

scholarly journals Virtual Reality based Hologram for Emergency Situation

2020 ◽  
Vol 9 (1) ◽  
pp. 1075-1079
Keyword(s):  
Virtual Reality ◽  
Human Activities ◽  
Emergency Situation ◽  
Hearing Protection ◽  
Protection Device ◽  
Rule Based ◽  
Holographic Image ◽  
Wide Range ◽  
And Performance ◽  
Rule Based Approach

Virtual reality is seen as an elite way for viewing and it has the potential to target a wide range of applications. Holography is a pictorial method that records the light scattered from an object, presenting it in a way that appears in a 3D form. During mining the miners will be in need of certain essential requirements to make their work more efficient. Existing system only detects if there isany dangers inside the mines and does not provide with the required items to the miners. The proposed system focuses on providing these essential requirements. The items include Hearing protection device, PAPRs, foot protection, clothes, belts and D-rings and self-rescue device. We have conducted a survey based on various algorithms and methods that are used to create a hologram and for analysing holographic image. The survey tells us that methods like Rule based approach which requires large amount of data is used to classify human activities. Multiplexing is used to combine many signals into one and produce an image. These systems have various issues when it comes to time and performance. It provides with some handy data on some of the encouraging milestones that have been attained in hologram acquisition, display and processing

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