Saccade Landing Point Prediction

2018 ◽  
Author(s):  
Aythami Morales ◽  
Francisco M. Costela ◽  
Ruben Tolosana ◽  
Russell L. Woods
Keyword(s):  
Landing Point

scholarly journals Two-Stage Water Jet Landing Point Prediction Model for Intelligent Water Shooting Robot

Sensors ◽  
2021 ◽  
Vol 21 (8) ◽  
pp. 2704
Author(s):  
Yunhan Lin ◽  
Wenlong Ji ◽  
Haowei He ◽  
Yaojie Chen
Keyword(s):  
Pitch Angle ◽  
Back Propagation ◽  
Water Jet ◽  
The State ◽  
Model Parameters ◽  
Propagation Time ◽  
Back Propagation Algorithm ◽  
Angle Error ◽  
Landing Point ◽  
Propagation Algorithm

In this paper, an intelligent water shooting robot system for situations of carrier shake and target movement is designed, which uses a 2 DOF (degree of freedom) robot as an actuator, a photoelectric camera to detect and track the desired target, and a gyroscope to keep the robot’s body stable when it is mounted on the motion carriers. Particularly, for the accurate shooting of the designed system, an online tuning model of the water jet landing point based on the back-propagation algorithm was proposed. The model has two stages. In the first stage, the polyfit function of Matlab is used to fit a model that satisfies the law of jet motion in ideal conditions without interference. In the second stage, the model uses the back-propagation algorithm to update the parameters online according to the visual feedback of the landing point position. The model established by this method can dynamically eliminate the interference of external factors and realize precise on-target shooting. The simulation results show that the model can dynamically adjust the parameters according to the state relationship between the landing point and the desired target, which keeps the predicted pitch angle error within 0.1°. In the test on the actual platform, when the landing point is 0.5 m away from the position of the desired target, the model only needs 0.3 s to adjust the water jet to hit the target. Compared to the state-of-the-art method, GA-BP (genetic algorithm-back-propagation), the proposed method’s predicted pitch angle error is within 0.1 degree with 1/4 model parameters, while costing 1/7 forward propagation time and 1/200 back-propagation calculation time.

Simulation of an Aircraft Accident at Brussels Airport

1986 ◽  
Vol 2 (1-4) ◽  
pp. 207-208
Author(s):  
Fr Labeeu ◽  
M de Backer ◽  
C Bellanger
Keyword(s):  
Military Hospital ◽  
University Hospitals ◽  
Disaster Plan ◽  
Code Number ◽  
Landing Point ◽  
Call Number ◽  
Aircraft Accident ◽  
The Military

The exercise held at Brussels Airport was carried out by inexperienced personnel to highlight the most common errors and shortcomings of an existing disaster plan.INCIDENT COMMUNICATIONOnce an aircraft is known to be in trouble, all the nearby fire brigades are alerted by means of the unique call number 900 and move to take up their stand-by position close to the landing point. The Military Hospital is also alerted and sends out a liaison car, with a doctor among its occupants. This car joins the stand-by position. Once the aircraft has crashed, the fire engines rush to the site and all the major university hospitals and the Military Hospital are notified by the same 900-code number. Disaster teams arrive by road.This report is almost exclusively limited to aspects of rescue, triage, on-site stabilization, and evacuation of the casualties.

scholarly journals DEBARCADERE DE LOCODJRO ET DEVELOPPEMENT DE LA PECHE ARTISANALE EN COTE D’IVOIRE : DEFIS ET PERSPECTIVES / LOCODJRO LANDING STAGE AND DEVELOPMENT OF ARTISANAL FISHERIES IN CÔTE D'IVOIRE: CHALLENGES AND PROSPECTS

2021 ◽  
Vol 6 (6) ◽  
Author(s):  
Sekongo Largaton Guénolé ◽  
Yeo Napari Elisée ◽  
Koudou Dogbo
Keyword(s):  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Negative Impact ◽  
Economic Life ◽  
Artisanal Fishing ◽  
Cote D’Ivoire ◽  
Landing Point ◽  
Cette Situation ◽  
Côte D'ivoire ◽  
Mesures Correctives

Considéré comme une véritable source d’espoir pour promouvoir la pêche artisanale en Côte d’Ivoire, le débarcadère de Locodro baptisé « Point de débarquement Mohammed VI » reste encore loin de répondre à cette attente après son ouverture en juin 2018. Cette situation suscite plusieurs interrogations sur les difficultés auxquelles il est confronté vu les commodités qu’il comporte pour être un excellent centre d’approvisionnement en produits halieutiques. Cette étude permet donc d’identifier ces difficultés, de montrer leurs conséquences sur la vie socio-économique des acteurs et de faire des recommandations pour la bonne marche dudit débarcadère. Pour la collecte des données, des documents traitant des thèmes en rapport avec la pêche ont été consultés. En plus, une enquête a été réalisée par le biais d’un questionnaire et des entretiens. Les résultats ont montré que les difficultés qui entravent le bon fonctionnement du débarcadère sont principalement liées à sa délocalisation d’Abobo-Doumé à Locodjro. Ces difficultés impactent négativement la vie socio-économique des acteurs. Cette situation qui suscite des inquiétudes recommande que des mesures correctives soient prises avec l’implication de toutes les parties concernées pour une rentabilité durable du débarcadère au profit de tous. Considered as a real source of hope to promote artisanal fishing in Côte d'Ivoire, the landing stage of Locodro named "Mohammed VI Landing Point" is still far from meeting this expectation after its opening in June 2018. This situation raises several questions about the difficulties it faces given the amenities it has to be an excellent supply centre for fishery products. This study therefore makes it possible to identify these difficulties, to show their consequences on the socio-economic life of the actors and to make recommendations for the good functioning of the said landing stage. For the collection of data, documents dealing with themes related to fishing were consulted. In addition, a survey was carried out by means of a questionnaire and interviews. The results showed that the difficulties hindering the proper functioning of the landing stage are mainly related to its relocation from Abobo-Doumé to Locodjro. These difficulties have a negative impact on the socio-economic life of the stakeholders. This situation, which gives rise to concern, recommends that corrective measures be taken with the involvement of all the parties concerned for a sustainable profitability of the landing stage for the benefit of all. <p> </p><p><strong> Article visualizations:</strong></p><p><img src="/-counters-/edu_01/0896/a.php" alt="Hit counter" /></p>

Real-Time Trajectory Generation and Reachability Determination in Autorotative Flare

2020 ◽  
Vol 65 (3) ◽  
pp. 1-17
Author(s):  
Brian F. Eberle ◽  
Jonathan D. Rogers
Keyword(s):  
Real Time ◽  
Trajectory Generation ◽  
Contact Theory ◽  
Simulation Environment ◽  
Order Model ◽  
Landing Point ◽  
Overall Performance ◽  
Simulation Results ◽  
Six Degree Of Freedom ◽  
Trajectory Generator

Autorotation maneuvers inherently offer little margin for error in execution and induce high pilot workload, particularly as the aircraft nears the ground in an autorotative flare. Control augmentation systems may potentially reduce pilot workload while simultaneously improving the likelihood of a successful landing by offering the pilot appropriate cues. This paper presents an initial investigation of a real-time trajectory generation scheme for autorotative flare based on time-to-contact theory. The algorithm exhibits deterministic runtime performance and provides a speed trajectory that can be tracked by a pilot or inner-loop controller to bring the vehicle to a desired landing point at the time of touchdown. A low-order model of the helicopter dynamics in autorotation is used to evaluate dynamic feasibility of the generated trajectories. By generating and evaluating trajectories to an array of candidate landing points, the set of reachable landing points in front of the aircraft is determined. Simulation results are presented in which the trajectory generator is coupled with a previously derived autorotation controller. Example cases and trade studies are conducted in a six degree-of-freedom simulation environment to demonstrate overall performance as well as robustness of the algorithm to variations in target landing point, helicopter gross weight, and winds. The robustness of the reachability determination portion of the algorithm is likewise evaluated through trade studies examining off-nominal flare entry conditions and the effects of winds.

scholarly journals Wolston Park Hospital, 1865–2001: A Retrospect

2008 ◽  
Vol 15 (2) ◽  
pp. 39-58 ◽  
Author(s):  
Mark Finnane
Keyword(s):  
Aboriginal People ◽  
Word Meaning ◽  
Landing Point ◽  
Step Over ◽  
Park Hospital ◽  
Lying Down ◽  
Growing Population

We know about the first day at Wolston Park from a report in theBrisbane Courierof 1865. On 12 January of that year, seven prison warders (two of them women) and ten police constables escorted 57 male and twelve female lunatics from Brisbane Gaol ‘to the new Asylum at Woogaroo’. Since 1859, Queensland's insane had no longer been sent to Sydney, but were lodged instead at the Brisbane Gaol. Now the asylum was ready, its residents were loaded into cabs and taken down to the river. There they boarded a steamer namedSettlerand were conveyed down the river to the landing point near Woogaroo Creek. The name of the asylum hinted at the reality that this was Aboriginal land: the word Woogaroo, so it was remembered in the 1930s, being a corruption of an Aboriginal word meaning ‘to step over a person lying down’. Aboriginal people would be among the earliest inhabitants of the asylum, but not in great numbers. Instead, the institution was rapidly filled from its earliest days with the immigrant settlers who made up most of the colony's growing population.

Cyclone evacuation in the Timor Sea—a case study

2008 ◽  
Vol 48 (1) ◽  
pp. 43
Author(s):  
Michelle Zaunbrecher ◽  
Kerri Reeks
Keyword(s):  
Emergency Response ◽  
Landing Site ◽  
Cloud Base ◽  
Measurement Information ◽  
Flight Crew ◽  
Landing Point ◽  
Drilling Rig ◽  
Regulatory Rule ◽  
Response Team ◽  
Timor Sea

Nexus Energy (Nexus) is the operator of the ACP23 permit in the Territory of Ashmore Cartier in the Timor Sea. The permit contains the Crux gas and condensate field. During March 2007, Nexus was undertaking drilling operations at the Crux field using the semi-submersible drilling rig Songa Venus, operated by Songa Drilling. Nexus utilised the Truscott Airbase to land fixed wing aircraft from Darwin, and then flew helicopters from Truscott out to the rig. An incident occurred as a result of failing to completely down-man the Songa Venus in the face of approaching Tropical Cyclone George. The National Offshore Petroleum Safety Authority (NOPSA) issued an Improvement Notice to Songa as the Rig Safety Case owner. Nexus was responsible for providing aviation transport and logistics. The evacuation planning allowed for a 12 hour buffer. Nonetheless, rapid changes in weather resulted in this buffer time being inadequate. On the morning of the planned final evacuation flight, the Bureau of Meteorology (BOM) issued a forecast of cloud base below the aviation alternate minima for Truscott (1,079 ft above ground level and 4.4 km visibility). The weather forecast of the cloud base minima being predicted to be below the aviation alternate minima invokes an aviation regulatory rule. This aviation regulatory rule requires that a suitable onshore alternate landing site is available before the helicopter is allowed to take off. The designated alternate landing point at Troughton Island was predicted to be similarly affected by weather and not suitable as an alternate landing point. The selected alternate landing site cannot then also require an alternate. Therefore, the helicopter was not able to take off and the flight to the rig was consequently aborted leaving 17 people onboard the rig. Nexus has since dedicated significant effort and resources to rectifying the situation that occurred. Nexus plans to develop the Crux field and therefore must find a reliable solution for future cyclone evacuations. Nexus undertook an extensive review of regional alternate landing sites relevant to Truscott airbase and Crux. The most viable and reliable options for the Crux field were assessed as Cape Leveque and Kupang, West Timor. Along with other technical solutions, Nexus has funded the upgrade of the existing Truscott BOM weather station facilities to an Automatic Weather Information System (AWIS), which will be operational for the 2007/08 cyclone season. The AWIS includes: a ceilometer that measures cloud base minima, a vis-meter that measures cloud cover, and an air pressure sensing pparatus (QNH). This information is measured and transmitted in real time to aviator operators. The documented height above the runway designated as the alternate minima is determined by the height of the surrounding terrain. The philosophy behind the lowering of the alternate level, when AWIS information is available, is based upon the flight crew being able to accurately set a known current QNH reading onto an altimeter sub scale, thus increasing altimeter integrity. The improved weather measurement information has allowed for a 100 ft reduction in approach and alternate minima for the airbase. This is of potentially significant benefit given that the incident described in this paper was directly related to the inability of the helicopter to take off from Truscott due to restrictions on alternate minima. In addition, the installation of the AWIS will allow for more accurate weather forecasting for Truscott and the region. A key outcome of the assessment undertaken was to improve the definition of the tasks that need to be undertaken for cyclone emergency planning, and clearly assign these tasks to positions in the emergency response team. The revised emergency response team is comprised of three key roles: cyclone evacuation coordinator; transport coordinator; and aviation technical advisor. The cumulative effect of multiple operators working in the region needs to be assessed on an ongoing basis. Substantial improvements can be made to cyclone evacuation infrastructure and resources via an industry-wide approach.

scholarly journals Inkjet printing-based fabrication of microscale 3D ice structures

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Fengyi Zheng ◽  
Zhongyan Wang ◽  
Jiasheng Huang ◽  
Zhihong Li
Keyword(s):  
Inkjet Printing ◽  
Degrees Of Freedom ◽  
Growth Direction ◽  
Ice Crystals ◽  
Maximum Height ◽  
Landing Point ◽  
Printing Process ◽  
3D Structures ◽  
Low Humidity ◽  
Supporting Material

Abstract This study proposed a method for fabricating 3D microstructures of ice without a supporting material. The inkjet printing process was performed in a low humidity environment to precisely control the growth direction of the ice crystals. In the printing process, water droplets (volume = hundreds of picoliters) were deposited onto the previously formed ice structure, after which they immediately froze. Different 3D structures (maximum height = 2000 µm) could be formed by controlling the substrate temperature, ejection frequency and droplet size. The growth direction was dependent on the landing point of the droplet on the previously formed ice structure; thus, 3D structures could be created with high degrees of freedom.

Advantage of Studying Lithology of Dense Zones Formation to Avoid Well Bore Collapse between Sidetrack and Landing Point - Case Study - Offshore Abu Dhabi

2018 ◽  
Author(s):  
Hocine Khemissa ◽  
Zohaib Channa ◽  
Salman F. Nofal ◽  
Kevin Dean McNeilly ◽  
Ali AL-Felasi ◽  
...  
Keyword(s):  
Abu Dhabi ◽  
Well Bore ◽  
Landing Point
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