DeepC: The New Deep Water AUV Generation

2003 ◽  
Author(s):  
Willi Hornfeld
Keyword(s):  
Fuel Cell ◽  
Modular Design ◽  
Autonomous Underwater Vehicles ◽  
Electrical Power ◽  
Underwater Vehicle ◽  
External Support ◽  
Temperature Management ◽  
Maximum Speed ◽  
Residual Water ◽  
Vehicle Guidance

The development of real Autonomous Underwater Vehicles (AUVs) represents a very particular challenge which is being tackled within the scope of the German co-operation project DeepC (www.deepc-auv.de), reaching the middle of the project time frame. The aim of this project is to develop a fully autonomous underwater vehicle for great diving depths, long mission times and a modular design with the following main features: • Mission depth till 4000 m (Crush: 6000 m); • Weight in air 2.4 t; • Cruise speed 4 kts; • Maximum speed 6 kts; • Mission time up to 60 hours; • Operating range up to 400 km; • Payloads ≥ 250 kg. The subjects of vehicle structure, maximum manoeuvrability, electrical power generation, storage and distribution, intelligent behaviour and precise navigation are some of the crucial aspects for the development of such an underwater vehicle. The high speed and manoeuvrability are rendered possible by two horizontal drive systems and four thrusters for transverse and vertical thrust. Electrical motors that are pressure-neutral up to depths of 7000 m are provided for propulsion. A battery-buffered PEM H2/O2 fuel cell whose functionality offers numerous advantages over other systems is used to generate the electrical power needed for DeepC operation. The storage of the reactants hydrogen and oxygen, the trimming-neutral accommodation of the residual water produced, the temperature management and especially also safety problems in connection with the possible development of oxyhydrogen gas are, however, a problem when the AUV is operated independently from an external air supply. Mission management systems perform vehicle guidance, assure intelligent behaviour in special situations, provide a degradation mode for emergencies and/or plan missions independently with due consideration to the targets set. Without external support, the navigation system must allow precise AUV navigation over longer periods of time. Mission-specific sensor systems support vehicle guidance, avoid collisions and perform the actual measuring tasks. Due to a modular payload concept, the vehicle can be easily used for a lot of different missions with a very low amount of mobilisation and demobilisation. The paper describes the current development status in general and the technological highlights like fuel cell, intelligent behaviour, etc. in particular, gives an outlook into the future and shows examples of applications.

AUV DeepC: Technology Platform for the Atlas Elektronik AUV Family

2004 ◽  
Author(s):  
Willi Hornfeld
Keyword(s):  
Modular Design ◽  
Autonomous Underwater Vehicle ◽  
Underwater Vehicle ◽  
Maximum Speed ◽  
Operational Experience ◽  
Unmanned Underwater Vehicles ◽  
Technological Basis ◽  
Deep Diving ◽  
Vehicle System ◽  
High Efficient

ATLAS ELEKTRONIK has a long tradition in the development and manufacture of naval systems and marine technologies like mine-countermeasure boats, integrated sonar, command and control systems and unmanned underwater vehicles (UUVs). One of the latest UUV-product development is the autonomous underwater vehicle, called DeepC with the main features: • Mission depth till 4000 m (Crush: 6000 m); • Weight in air 2.4 to  ; • Cruise speed 4 kts; • Maximum speed 6 kts; • Mission time up to 60 hours; • Operating range up to 400 km; • Payloads 250 kg. The development was started on Jan. 1st 2001 and will be finalized end of 2004 with the deep water tests. DeepC (www.deepc-auv.de) is a high efficient deep diving autonomous underwater vehicle system with long endurance for a lot of applications. Many actions that would normally require high cost ROV systems or which are not possible (e.g. under ice investigations) can now be accomplished using DeepC, at less cost and manpower. The main performance parameters of the DeepC system are in general: • Autonomous mission execution; • Low weight; • High manoeuvrability; • Hover capability; • Modular design; • Containerised Payload; • Deployment from vessels of opportunity; • Obstacle avoidance; • In mission re-planning capability; • Precise navigation; • Advanced diagnosis and fault recovery system. With these performance takes the DeepC system an international top place on the AUV sector and has in the framework of the ATLAS ELEKTRONIK AUV family philosophy a key position: it is the technological basis and highlight of the AUV family, contains the equipment with the most fastidious technologies and is now in the final phase of the development. The second member of the AUV family is the SeaOtter Mk 1, a vehicle system based on an ATLAS MARIDAN development. This AUV is extensively tested, qualified and successfully introduced at the market in its basic version. With the help of the DeepC, technology upgrades are planned which will lead to a substantial performance increase. The AUV of the third generation represents the SeaOtter Mk 2, whose development was up-to-date started and which bundles both, the DeepC technology and the operational experience of the SeaOtter Mk 1.

scholarly journals A Study of the Feasibility of Autonomous Underwater Vehicles and Remotely Operated Vehicles in Black Sea

2018 ◽  
Vol XIX (1) ◽  
pp. 440-447
Author(s):  
Tărăbuță O
Keyword(s):  
Black Sea ◽  
Modular Design ◽  
Data Transfer ◽  
Autonomous Underwater Vehicles ◽  
Underwater Vehicle ◽  
Underwater Vehicles ◽  
Design And Technology ◽  
The Black Sea ◽  
Umbilical Cable ◽  
Propulsion Unit

An underwater vehicle designed for industrial use in the Black Sea has to tackle two specific characteristics of it, given by its enclosed nature: the strong vertical stratification and the high content of hydrogen sulfide at greater depths. These particular environmental conditions impose also new approaches of design and technology for construction. The innovation foreseen of our study is the very concept of a universal underwater vehicle, based on modular design. Currently, unmanned underwater vehicles are controlled in two main ways, either autonomously (AUV) or by data transfer through an umbilical cable (ROV). Despite the fact AUV and ROV have many common characteristics they are used separately and are disjoint throughout their life cycle. To increase the technical performances and economic efficiency of such vehicles, we planned to design a universal carrier platform able to support different modules. Based on the common carrier sub-system, DCUV (Dual Controlled Underwater Vehicles) can be assembled as an AUV, controlled autonomously and by radio when surfaced. After its recovery and transfer of the sea data recorded during its evolution as an AUV, the specific modules (sensors and battery) are replaced with functional modules needed to change it into an ROV, which can be then remotely controlled towards the contacts of interest. The concept of providing DCUV with a common propulsion unit will be eased by designing of an innovative multi-control system that will integrate data from sensors and human operator with the propulsion motors and end effectors, based on state-of- the-art microcontrollers and their appropriate programming.

Computer Models of Pem Fuel Cells for the Study of Transient Modes in Electrical Power Supply Complexes

2021 ◽  
Vol 64 (3) ◽  
pp. 60-67
Author(s):  
Ivan Vasyukov ◽  
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Dynamic Response ◽  
Gradient Descent ◽  
Eddy Currents ◽  
Least Squares Method ◽  
Electrical Power ◽  
Computer Models ◽  
Pem Fuel Cells ◽  
Current Voltage

Static and dynamic computer models of fuel cells are considered. A static model is determined that most ac-curately reproduces the current-voltage characteristic of a real fuel cell. A method for tuning it according to the experimental I - V characteristic by the least squares method is proposed. A method for its adjustment ac-cording to the experimental I - V characteristic by the method of gradient descent is proposed. A modified elec-trical equivalent circuit of a fuel cell has been developed, which simulates its dynamic response, taking into ac-count the damping effect of eddy currents during operation of a stack of fuel cells on a pulse voltage converter. A method is proposed for determining the parameters of the model from the experimental oscillograms of the current and voltage of the stack. A universal model of a stack of fuel cells in LTspice has been developed, which makes it possible to simulate a dynamic response and, if necessary, simulate a real static I – V characteristic of the stack.

Fuel-Cell Hybrid Systems to Generate Shipboard Electrical Power

2009 ◽  
Author(s):  
W. J. Sembler ◽  
S. Kumar
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Air Quality ◽  
Hybrid Systems ◽  
Hybrid System ◽  
Cell Hybrid ◽  
Electrical Power ◽  
History Of ◽  
Marine Applications ◽  
Fuel Cell Hybrid

The reduction of shipboard airborne emissions has been receiving increased attention due to the desire to improve air quality and reduce the generation of greenhouse gases. The use of a fuel cell could represent an environmentally friendly way for a ship to generate in-port electrical power that would eliminate the need to operate diesel-driven generators or use shore power. This paper includes a brief description of the various types of fuel cells in use today, together with a review of the history of fuel cells in marine applications. In addition, the results of a feasibility study conducted to evaluate the use of a fuel-cell hybrid system to produce shipboard electrical power are presented.

Design, Modeling, and Experimental Drag Characterization of a Bio-Inspired, Shape-Adapting Underwater Vehicle

2018 ◽  
Author(s):  
Levi D. DeVries ◽  
Michael D. M. Kutzer ◽  
Rebecca E. Richmond ◽  
Archie C. Bass
Keyword(s):  
Spatial Scales ◽  
Autonomous Underwater Vehicles ◽  
Major Axis ◽  
Underwater Vehicle ◽  
Great Promise ◽  
Hydrodynamic Drag ◽  
Control Input ◽  
Semi Major Axis ◽  
Generative Modeling

Autonomous underwater vehicles (AUVs) have shown great promise in fulfilling surveillance, scavenging, and monitoring tasks, but can be hindered in expansive, cluttered or obstacle ridden environments. Traditional gliders and streamlined AUVs are designed for long term operational efficiency in expansive environments, but are hindered in cluttered spaces due to their shape and control authority; agile AUVs can penetrate cluttered or sensitive environments but are limited in operational endurance at large spatial scales. This paper presents the prototype testbed design, modeling, and experimental hydrodynamic drag characterization of a novel self-propelled underwater vehicle capable of actuating its shape morphology. The vehicle prototype incorporates flexible, buckled fiberglass ribs to ensure a rigid shape that can be actuated by modulating the length of the semi-major axis. Tools from generative modeling are used to represent the vehicle shape by using a single control input actuating the vehicles length-to-diameter ratio. By actuating the length and width characteristics of the vehicle’s shape to produce a desired drag profile, we derive the feasible speeds achievable by shape actuation control. Tow-tank experiments with an experimental proto-type suggest shape actuation can be used to manipulate the drag by a factor between 2.15 and 5.8 depending on the vehicle’s operating speed.

EXPERIMENTAL STUDY OF BIOELECTRICITY-MICROBIAL FUEL CELL FOR ELECTRICITY GENERATION: PERFORMANCE CHARACTERIZATION AND CAPACITY IMPROVEMENT

2017 ◽  
Vol 79 (5-2) ◽  
Author(s):  
Zul Hasrizal Bohari ◽  
Nur Asyhikin Azhari ◽  
Nuraina Nasuha Ab Rahman ◽  
Mohamad Faizal Baharom ◽  
Mohd Hafiz Jali ◽  
...  
Keyword(s):  
Organic Matter ◽  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Electrical Power ◽  
Electrical Energy ◽  
Sewage Water ◽  
Electricity Production ◽  
Sample Type ◽  
Series Of Experiments ◽  
The Right

Energy trending lately shown the need of new possible renewable energy. This paper studies about the capability and capacity generating of electricity by using Bio-electricity-Microbial Fuel Cell (Bio-MFC). Bio-MFC is the device that converts chemical energy to electrical energy by using microbes that exist in the sewage water. The energy contained in organic matter can be converted into useful electrical power. MFC can be operated by microbes that transfer electrons from anode to cathode for generating electricity. There are two major goals in this study. The first goal is to determine the performance characteristics of MFCs in this application. Specifically we investigate the relationship between the percentages of organic matter in a sample results in higher electricity production of MFCs power by that sample. As a result, the sewage (wastewater) chosen in the second series experiment because the sewage (wastewater) also produced the highest percentage of organic matter which is around 10%. Due to these, the higher percentage of organic matter corresponds to higher electricity production. The second goal is to determine the condition under which MFC work most efficiently to generating electricity. After get the best result of the combination for the electrode, which is combination of zinc and copper (900mV),the third series of experiments was coducted, that show the independent variable was in the ambient temperature. The reasons of these observations will be explained throughout the paper. The study proved that the electricity production of MFC can be increased by selecting the right condition of sample type, temperature and type of electrode. 

Sign in / Sign up

Export Citation Format

Share Document