Design and Simulation of High Altitude Air-Launched Automatic Underwater Vehicles

2011 ◽  
Vol 128-129 ◽  
pp. 1386-1391 ◽  
Author(s):  
Chang Jun Pan ◽  
Ying Qing Guo
Keyword(s):  
High Altitude ◽  
Underwater Vehicles ◽  
Simulation System ◽  
Long Distance ◽  
Wing Area ◽  
Matlab Simulink ◽  
Six Dof

In this paper, an high altitude air-launched automatic underwater vehicles (AL-AUV) is designed based on the traditional torpedo-like AUV, REMUS. And an additional ex-range gliding wings unit is assembled on the top of AUV, which enable the AUV to be dropped at high altitude and gliding long distance to reach the signed investigating ocean field. The controllable surface on the wings also enhanced the controllability and flexibility of AUV gliding through the air and the ability against the influence of airflow interference. The AUV’s six DOF gliding model is established and a simulation system of AL-AUV is built with Matlab/Simulink. Analyzing the recorded simulation velocity and pitch characteristics of AL-AUV deployed at varying initial velocities and wing area, the optimized wing is selected.

scholarly journals High-Altitude and Long-Distance Flights

Nature ◽  
1935 ◽  
Vol 135 (3409) ◽  
pp. 335-336
Keyword(s):  
High Altitude ◽  
Long Distance

scholarly journals The Modeling and Analysis of a Power Transmission Line Supplied by a Solar Power Plant

2018 ◽  
Vol 12 (3) ◽  
pp. 124-130
Author(s):  
Erol Can
Keyword(s):  
Power Plant ◽  
Transmission Line ◽  
Solar Power ◽  
Electrical Power ◽  
Solar Power Plant ◽  
Energy Transmission ◽  
Long Distance ◽  
Line System ◽  
Matlab Simulink ◽  
Direct Voltage

This article deals with the energy transmission line system which feeds from solar energy at the MATLAB Simulink. So, direct voltage is considered to be converted as an alternating voltage by a 35-level inverter after the solar power plant which has the power of 110 MW an produce 360 kV of direct voltage. A line which covers 240 km of distance is preferred to transmit electrical power from the A1 point to an A2 point. Due to this, the required mathematical equations are calculated with a circuit analyzing method for the line modeling in the simulation. Experiments on the model are carried out at the MATLAB Simulink after the creation of an energy transmission line. After that, when measurements are made taking into consideration the A2 node; the capacitor voltage, the transformer current, the A2 node current, and the fault current, values are given according to the converted voltage at the frequencies of 100 Hz, 80 Hz, and 50 Hz. The obtained results demonstrate the success of the proposed line system, while power is distributed with eliminated fault at a long distance at different frequencies.

Mobility in the Mountains: Late Third and Second Millennia Alpine Societies' Engagements with the High-Altitude Zones in the Southern French Alps

2011 ◽  
Vol 14 (1-2) ◽  
pp. 88-115 ◽  
Author(s):  
Kevin Walsh ◽  
Florence Mocci
Keyword(s):  
High Altitude ◽  
Fundamental Change ◽  
Homo Economicus ◽  
Long Distance ◽  
French Alps ◽  
The Third ◽  
Economic Practices ◽  
Art Forms ◽  
Burial Rites ◽  
Alpine Space

The assessment of the important changes that occurred in late third and second millennia societies across Europe often emphasizes changes in technology and the emergence of associated objects and art forms, changes in burial rites, and developments in economic practices. Notions relating to the evolution of homo economicus dominate many of the discourses, and the evidence for increased long-distance trade / contact across Europe is used to bolster this assessment. These themes are underpinned by an obsession with ever-refined chrono-typological phases. In an attempt to present a more socially embedded perspective, this paper considers the changes that occurred in the uses of the high-altitude, sub-alpine, and alpine zones in the southern French Alps during the third and second millennia BC. From c. 2500 BC onwards, there was a fundamental change in the use of and engagement with this landscape. The first substantial stone-built pastoral structures at high altitude (2000 m and above), appear at this time. This departure in the use and structuring of the alpine space would have included concomitant changes in the nature of mobility, notions of territory, and memories associated with this area.

High-Bandwidth Underwater Wireless Communication Using a Swarm of Autonomous Underwater Vehicles

2019 ◽  
Author(s):  
Alexandre Immas ◽  
Mohsen Saadat ◽  
Jesus Navarro ◽  
Matthew Drake ◽  
Julie Shen ◽  
...  
Keyword(s):  
Wireless Communication ◽  
Autonomous Underwater Vehicles ◽  
Underwater Vehicles ◽  
Optical Signal ◽  
Image Processing Technique ◽  
Communication Link ◽  
Water Tank ◽  
Long Distance ◽  
High Bandwidth ◽  
Underwater Wireless Communication

Abstract We present a new method for underwater wireless communication with high bandwidth and over long distance. A swarm of Autonomous Underwater Vehicles (AUVs) is used to relay an optical signal between two points at any distance. Each vehicle is equipped with multiple attitude stabilization systems to reach the required pointing and tracking accuracy for optical communication. This technology would enable fast and efficient underwater exploration which is highly needed as only 5% of the world’s oceans have been explored so far. We carried out an experimental proof of concept to show that it is possible to relay an optical signal underwater between two points using a swarm of AUVs. The experiment took place in a 2m deep water tank. We modified and controlled two submarine models to reflect the laser beam stemming from a laser pointer at the bottom of the tank to the desired location. To know their positions, we developed an image processing technique which required the setup of a RF communication link at 315Mhz between the computers processing the camera’s videos and the units.

scholarly journals Migrating bats cross top of Europe

2016 ◽  
Author(s):  
Peter E Zingg ◽  
Fabio Bontadina
Keyword(s):  
High Altitude ◽  
Climatic Conditions ◽  
Swiss Alps ◽  
Research Station ◽  
Long Distance ◽  
Tadarida Brasiliensis ◽  
The Alps ◽  
Shed Light ◽  
The Way

Bats have evolved migration to escape unfavourable climatic conditions. However, their migratory flyways and the way how they surmount geographical barriers are still unknown. The Jungfraujoch in the Swiss Alps is a mountain covered in permafrost (3460m ASL), known colloquially as the “Top of Europe”. Using broadband ultrasound recorders, we tested the occurrence of bats at the high altitude research station. In 36 nights, we recorded 268 bat call sequences of 8 species, including all European long-distance migrant bats. Since no feeding buzzes were recorded, we assume the bats were on transit. This is the first evidence to show that migrating bats can fly at unprecedented altitudes to cross the Alps. This feat outperforms the spectacular behaviour of the high altitude foraging bat Tadarida brasiliensis. Our findings shed light on the bats’ migratory flyways and demonstrate that the field of aeroecology can still uncover unexpected perspectives on the behaviour of bats.

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