Flatfish

Subsea-resident AUV


Flatfish
FlatFish being recovered after a test run. (Source: Florian Cordes, Ground Truth Robotics GmbH)

Technical Details

Size: 205 cm x 96 cm x 50 cm
Weight: 275 kg in-air
Power supply: 5.8 kWh Li-Ion battery, extension option to 11 kWh
Speed: 3 knots
Actuation/ Engine:
6x Enitech ring thruster, 60 N each
Sensors:
BlueView MB1350-45
Tritech Gemini 720i
2x Tritech Micron Sonar
4x Camera: Basler ace-2040-25gc, 2040x2040 pixels each
2x Laser line projector, 532 nm
Rowe Dual Frequency DVL, 300kHz/1200kHz
Digiquartz 6000 Series Pressure Sensor
KVH 1750 IMU
Evologics 48/78 USBL
Communication:
Evologics 48/78 acoustic modem
50m Gigabit Copper Tether
500m Gigabit Fiber Tether
54 Mbps WiFi

Organisational Details

Partner: FIEB/SENAI, BG Brasil
Sponsor: EMBRAPII
anp
Team: Team VIII - Knowledge-based long-term Autonomy
Application Field: Underwater Robotics
Related Projects: CUSLAM
Localization and mapping in confined underwater environments (09.2009- 07.2012)
EurEx
Europa-Explorer (12.2012- 04.2016)
Related Robots: DAGON
Leng
Exploration AUV for long-distance-missions
Related Software: Rock
Robot Construction Kit

System description

FlatFish in the salt water basin above the pipeline mockup. (Source: Florian Cordes, Ground Truth Robotics GmbH)
FlatFish is an autonomous underwater vehicle (AUV) for repeated inspections of oil & gas subsea structures whilst being submerged for extended periods of time.

To achieve this, a variety of acoustic and optical sensors are employed and a subsea docking station has been designed

Two identical autonomous underwater vehicles (AUVs) were built, enabling simultaneous software development in both Brazil (Brazilian Institute of Robotics at SENAI-CIMATEC in Salvador) and Germany.

Mission scenario:
The vehicle is docked near an offshore facility and connected to a power supply and data uplink. The operator (either on the facility or at a remote location) commands the vehicle to perform an inspection task. Where the inspection target is remote from the facility the AUV undocks and follows a pipeline or flow line to a target area whilst collecting acoustic and visual data of the pipeline or flow line. Upon reaching the target area, acoustic and visual data from the inspection object is gathered. The vehicle then backtracks using acoustic and visual homing algorithms to return and connect to the docking station. The recorded data is then uploaded to be processed by automated systems and/or the human operator whilst the vehicle’s battery is being recharged. At the same time, the operator has the option of defining a follow-up mission.

DFKI’s contributions to the FlatFish project include the mechanical and electrical design of the vehicle as well as manufacturing and integration of the AUVs. Also, the basic software modules will be implemented at DFKI to allow for sensor data processing, vehicle control and navigation solutions such as waypoint following.
Higher-level algorithms will be developed as a joint effort between DFKI in Bremen and BIR in Salvador, Bahia.

Videos

FlatFish: Autonome SSIV Inspektion & Docking

Voll autonome FlatFish Mission: Das AUV koppelt sich ab, inspiziert sein Missionsziel (SSIV, subsea isolation valve) und kehrt zur Docking Station zurück.

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© DFKI GmbH
last updated 05.10.2017
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