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Concept of an autonomous in-situ sensor system for monitoring object movements caused by sea swells
OCEANS 2024 - Singapore
Year: 2024 | Conference Paper |
The concept of an autonomous in-situ sensor system, Motion Probe, for monitoring wave induced motions of underwater objects is presented. This cost-effective system integrates a pressure sensor alongside inertial and optionally global positioning sensors to collect data on the seastate, as well as the movement, acceleration, and orientation of the designated test object. Energy-efficient features,...Show More
Concept and Design of a Prototype Autonomous, Modular Subsea Bottom Station
Louis Leon Rautmann;Jan Witte;Thomas Emter;Minhaz Ahmed;Burkhard Rieck;Helge Renkewitz;Sascha Kosleck
This paper deals with the introduction of a novel concept of a customisable, modular and autonomous subsea bottom station (BASE). The subsea station will be supported by a floating surface unit ensuring cloud data connection as well as including MEMS-based energy harvesting and spaces for additional sensors. The concept not only serves as a long-term survey station or lander in the classical sense...Show More
Inspecting and maintaining large man-made underwater structures, like piles of wind turbines in the open sea, has long been a job performed by professional divers. With the aim of reducing both the hazards to the divers and the costs that come with such missions, efforts have been made to develop remotely operated underwater maintenance robots that can undertake these missions in the future. One s...Show More
Blue Crawfish Goes Swimming: Hardware Architecture of a Crawling Skid for Underwater Maintenance with a BlueROV2
Henrich Preuß;Valeska Cherewko;Johann Wollstadt;Anne Wendt;Helge Renkewitz
Underwater Robots are used for inspecting offshore structures like foundations of oil and gas platforms or wind turbines for many years. Nevertheless, due to the lack of technical solutions, much of the maintenance work still has to be performed by professional divers. This involves high risks and high costs. To solve this problem current research focuses on a type of underwater vehicles called “c...Show More
The number of people drowning in the sea or in lakes rises from year to year. However, drowning also occurs in private or public swimming pools. According to the statistical data, an average of more than 400 people drown in Germany every year. The numbers are similar for other countries across the world or even higher. On the other hand, the number of lifeguards decreases every year around the wor...Show More
Fuzzy logic docking control for underwater vehicles based on deep learning feature selection
Divas Karimanzira;Torsten Pfuetzenreuter;Ganzorig Baatar;Helge Renkewitz
OCEANS 2021: San Diego – Porto
Year: 2021 | Conference Paper |
In this paper, a fuzzy logic controller based on sonar and optical camera sensing will be developed and deployed. At long range, deep learning is used for detection and localization of the docking station in sonar images to find the direct way to the docking station. In the close range deep learning is applied to identify features of the docking station in optical camera images, which are then use...Show More
Evaluation of a high-end laserscanner for underwater archeology
Helge Renkewitz;Sebastian Matz;Sven Thomas;Jakob Schwendner;Jan Albiez
Archeology has been provided with many new technologies over the last years, like magnetometers, Lidar, etc. This resulted in new discoveries that would have not been possible without these new techniques.Underwater archeology has also made progress in utilizing new technologies like special sonars, high resolution cameras, magnetometers or sub-bottom profilers. A very interesting device for this ...Show More
Underwater communication becomes more and more important because the number of UUVs (unmanned underwater vehicles) and ROVs (remotely operated vehicles) used in underwater applications rises. These robots collect data from exploration and or inspection tasks and need to transfer them to be processed or evaluated.There are several methods of wireless underwater data transfer. Communication with aco...Show More
Development of a manipulatorsystem with several integrated effectors for a small hybrid Remotely Operated Vehicle (ROV)
Martin Raeder;Daniel Weber;Helge Renkewitz;Thomas Rauschenbach;Tom Ströhla;Thomas Sattel
OCEANS 2019 - Marseille
Year: 2019 | Conference Paper |
For small hybrid ROV's avoiding additional load during their mission is a crucial aspect. Especially if the task is an underwater manipulation for maintenance reasons. Therefore, it is important to choose suitable manipulators and at the same time to enable a variety of tasks for underwater manipulation. This paper presents an approach to use one manipulator with several effectors, which are inter...Show More
Today a large number of autonomous underwater vehicles (AUVs) are evaluated or operated all over the world. Most of them use their own control systems created by the vehicle's manufacturer or scientists of different research areas. The Fraunhofer Application Center System Technology currently owns three underwater vehicles (both AUVs and remotely operated vehicles, ROVs), a forth is under developm...Show More
Optimal Font Size for Head-Mounted-Displays in Outdoor Applications
2008 12th International Conference Information Visualisation
Year: 2008 | Conference Paper |
Modern mobile IT-systems offer a great potential for various applications and enable a user to work autonomously, to communicate or to retrieve information nearly everywhere. However, displaying information outdoors is still challenging for the system designer. Numerous approaches of Augmented Reality (AR) tend to integrate additional information into the real context of the user's environment. Us...Show More
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