Neither the proliferation of jellyfish neither lack of sand On the beaches, the great environmental problem of the oceans is marine litter. So within the European project SEACLEAR 2.0, a research team from the Technical University of Munich has developed an autonomous diving robot capable of detecting and recovering debris from the bottom. A kind of pool cleaning robot that plays in another league: the open sea.
But is there really so much shit in the sea? An example: In Dubrovnik they counted more than a thousand pieces of garbage in an area of only 100 square meters. In the Mediterranean, where there is tourism and ports, it is a real problem.
The pool cleaning robot. The system is made up of the robot and a series of auxiliary elements necessary to fulfill the mission: an unmanned mother ship, an auxiliary boat, a drone, an explorer robot of about 50 centimeters and the robot in question.
How does it work? The boat is what provides energy and data to the robots and is also responsible for mapping the bottom with camera and sonar, which allows objects to be identified even in murky waters. Afterwards, the small, agile scout robot quickly runs through it. With all this information, the pool cleaning robot descends with its eight miniturbines until it reaches that area where there is garbage. There, he picks up the objects and lifts them onto the auxiliary boat, which works as a container, using a winch.
Why is it important. Because it reaches where divers cannot or does not allow them to reach: as explains dr. Stefan Sosnowskifrom the Information Technology Control Chair of the TUM, a cost-benefit analysis proves that this autonomous waste collection is profitable from 16 meters deep. That’s where human diving becomes more expensive, time-consuming and dangerous. That is to say, this robot does not replace diving, but rather complements it to offer a global cleaning solution.
On the other hand, the system is not limited to extraction: it also constitutes a valuable tool for obtaining data since, thanks to the integrated sensors, it can generate maps of the bottom, identify types of waste and record its location, which can be useful in different fields, such as designing better environmental or port management policies.
Context. He SEACLEAR project It is funded by the European Union through the Horizon 2020 program. The consortium is made up of eight European partners: the universities of Munich, Delft, Cluj-Napoca and Dubrovnik on the academic level, plus the Port Authority of Hamburg, the Dubrovnik-Neretva Regional Development Agency and the company Subsea Tech. That the port of Hamburg and a company are part of the group is important: it is not an academic laboratory project, but the idea is to put it into practice, to real use at sea.
In detail. The intelligence of the system resides in four components: the identification of objects with camera and sonar, the manual labeling of more than 7,000 images of objects outside the seabed, the generation of 3D models through AI. From here, the system already knows where and how to grab those objects to extract them safely.
The key to this extraction is a four-finger clamp capable of applying up to 4,000 N of force, enough to lift objects weighing up to 250 kilograms. However, how much with pressure sensors to regulate that force so as not to break fragile materials such as plastics or glass. If you broke a plastic object into smaller pieces, the cure would be worse than the disease.
Yes, but. The first public demonstration of the system occurred in the port of Marseille, where the robot recovered, among other things, a wheel and a car seat. While it is true that it is a test in a real environment, it is a controlled demo under known conditions. The project has not yet made public data essential for its profitability and scalability, such as how many objects were recovered per hour, what is the error rate of the recognition system or the cost of operating the system in a real port for a year.
On the other hand, extracting objects from the bottom has its drawback: if they are large and have been deposited there for years, they can suspend contaminated sediments and disturb fauna that has colonized them. That is, paradoxically, cleaning can also have environmental impact.
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