Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Snake robot to the rescue

18.07.2006
It is intelligent and moves with the aid of hydraulic pressure and co-ordinated joint movements. A snake robot can perform life-saving operations during a fire, an explosion and in other hostile environments.

Try to picture a snake-like robot that can move into places that are too dangerous for humans to enter. The snake can climb up stairs, force past beams and twist itself round corners. Imagine that it has a built-in advanced water tap that not only can be turned on and off, but can allow the direction of the water flow to be altered.

Valves and water hydraulic motors

This new robot system is now in the development stages at SINTEF. A patent application has been filed and the research scientists have built a demonstrator to prove that the particular research-related challenges have been conquered. The work has so far consumed 18 months and a thesis at SINTEF. A Ph. D study, which is underway at NTNU, is concerned with developing a control strategy for the robot.

The snake contains 20 water hydraulic motors that move the robotic joints – and a similar number of valves to control the water flow to each motor. Each module consists of two hydraulic motors and two valves. The outer layer is comprised of a strong steel skeleton containing the joint modules, which can rotate around two orthogonal axes. The joints are controlled by custom-built electronics.

“It is much like the grab on an excavator where different joints and movements are co-ordinated by the operator. In this instance, the operator is the computer,” says Pål Liljebäck of SINTEF. “There are angle sensors in each joint, and we can decide with conplete accuracy the angle that we want in the joints. A camera in the snake’s head makes operating the snake like driving a remote-controlled car. The operator can tell the snake to move from A to B, and the snake works out on its own how to accomplish this. It knows how to cross a pile of materials, climb down on the back side and twist itself round objects in order to get footing.”

The energy to move the joints comes from 100 bars of hydraulic water pressure. “This pressure is strong enough to lift a car up off the ground, something that again explains how the snake can in principle break through a wall. But both the hydraulic pressure and the use of pure water without additives in the hydraulic system have posed challenges”, Liljebäck says.

At the cutting edge of research

A snake does not rely on any single part of its body to move forward. Instead, it uses its entire body to create co-ordinated movements that move it in the desired direction. Project manager Øyvind Stavdahl says that the project, which is being conducted in co-operation with NTNU Professor Kristin Y. Pettersen, is at the cutting edge of research because of its attempts to recreate a snake’s movement.

The steel skeleton and motors are being custom-built at local workshops in Trondheim, partly because the research scientists needed to take a novel approach in the construction of the water hydraulic valves.

“The lack of space has been a major challenge,” says Liljebäck. “We needed power valves that were small, water tolerant and capable of controlling both the direction and the amount of the water flow. The closest thing we found on the market that met the criteria was valves used in Formula One racing cars, but these cost NOK 100,000 each and didn’t tolerate water. As a result, we decided to manufacture our own valves and, in co-operation with a local workshop, we built a prototype from scratch.”

Applications

The snake has a wide variety of applications: fighting fires where humans can not enter due to heat or the risk of building collapse; underwater operations in connection with maintenance of oil installations on the sea floor; rescue operations in earthquake areas and potentially explosive situations.

“Tunnel fires are explosive and it is extremely dangerous for firefighters to enter the tunnel to extinguish the fire,” says Stavdahl. “In such situations, it is possible to imagine a whole nest of snakes slithering out from a layer in the tunnel. Since the snake has modules, it is possible to design snakes for different functions: snakes can, for example, provide oxygen masks to people trapped in the tunnel, light up the tunnel or carry a camera that provides firefighters outside an overview of the situation without requiring them to enter.”

The research scientists are now talking with American businesses concerning possible sales. Further research is still required until a commercial model is available. But the concept is clear. The project has been financed by Norsk Hydro’s fund for SINTEF

Aase Dragland | alfa
Further information:
http://www.sintef.no

More articles from Power and Electrical Engineering:

nachricht Did you know that the wrapping of Easter eggs benefits from specialty light sources?
13.04.2017 | Heraeus Noblelight GmbH

nachricht To e-, or not to e-, the question for the exotic 'Si-III' phase of silicon
05.04.2017 | Carnegie Institution for Science

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Making lightweight construction suitable for series production

More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.

Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.

"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

7th International Conference on Crystalline Silicon Photovoltaics in Freiburg on April 3-5, 2017

03.04.2017 | Event News

 
Latest News

Scientist invents way to trigger artificial photosynthesis to clean air

26.04.2017 | Materials Sciences

Ammonium nitrogen input increases the synthesis of anticarcinogenic compounds in broccoli

26.04.2017 | Agricultural and Forestry Science

SwRI-led team discovers lull in Mars' giant impact history

26.04.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>