Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

CeBIT: VibroTrack – Measuring wind turbines from a distance

25.02.2014
The rotor and tower of a wind turbine can vibrate excessively even in normal operation. The analysis of these vibrations plays an important role in development and maintenance. Previously this was possible only selectively and directly on the installation. The Fraunhofer Institute of Optronics, System Technologies and Image Exploitation IOSB uses modern information technology to measure the vibration pattern of the entire system structure from a distance of several hundred meters.

The rotor and tower of a wind turbine can vibrate excessively even in normal operation. The analysis of these vibrations plays an important role in development and maintenance. Previously this was possible only selectively and directly on the installation. The Fraunhofer Institute of Optronics, System Technologies and Image Exploitation IOSB uses modern information technology to measure the vibration pattern of the entire system structure from a distance of several hundred meters.


VibroTrack - Measuring wind turbines from a distance

The scientists will present the system concept at CeBIT at the Fraunhofer stand in Hall 9.

Even at normal wind speeds wind turbines oscillate by up to one meter. This places considerable strain on the material, which can cause damage and – in the worst case – system failure. Operators are therefore continually examining the magnitude of these vibrations with the help of sensors installed in the tower and rotor blades. The downside of this approach is that measurements can be taken only at those points at which sensors have been fitted. A complete pattern of vibrations for the entire installation cannot be obtained with this method. Offshore installations have additional requirements.

Researchers at the Fraunhofer IOSB have tackled this problem. At CeBIT in Hanover, they will present a system with which comprehensive vibration analyses of the entire installation can be performed from a distance of several hundred meters. The system contains a laser that is directed at the installation and is used to measure vibrations at any point of the wind turbine’s surface. To measure the vibration in moving parts, such as the rotor blades, the laser automatically follows their movement.

The tracking process is the key

This is achieved with the heart of the system – an IT-based tracking system, which is linked with the laser and image analysis system. Camera and laser are mounted on a pan-tilt head, allowing them to follow any point on a rotating rotor blade. The camera captures images of the installation and transmits them to image processing software, which uses them to generate a virtual model of the blades. Using these data, the tracking system controls the pan-tilt head to keep the laser focused on the rotor blades. At the same time the camera collects information about the exact position of the laser point on the rotor blade, which has a diameter of about two to three centimeters, to stabilize its orientation on the rotating wings.

By this method any number of points on the running installation can be scanned, even from a distance. The resulting analyses are quickly obtained and more comprehensive than with permanently installed sensors. The measurement duration is variable: The slower the vibrations, the longer the laser takes to measure them.

The compact system is mobile and can be taken to the desired location with a vehicle. Because of its high range it can also be used to study offshore installations from a ship, provided the ship’s own motion is compensated. Many wind farms in Germany have been in operation for more than 20 years, which is often their maximum lifespan. Operators can use this technology to evaluate their installations. The system provides decision-making support on issues such as: Does the condition of the installation allow its continued use? Do I sell it or do I build a new one on the same site?

At CeBIT, the researchers will present a prototype of the diagnostic tool. On a two-meter diameter model wind turbine at the joint Fraunhofer stand (Hall 9, Stand E40), visitors can follow the path of the eye-safe laser beam as a green dot on the rotor blades. On two connected screens the images from the camera and the vibration analysis can be seen.

The scientists will present the system at CeBIT at the Fraunhofer stand in Hall 9.

Weitere Informationen:

http://www.iosb.fraunhofer.de/servlet/is/43411/

Dipl.-Ing. Sibylle Wirth | Fraunhofer-Institut

More articles from Trade Fair News:

nachricht Market innovation at glasstec 2016: VGA infrared camera for the glass industry
28.09.2016 | Optris GmbH

nachricht Complex hardmetal tools out of the 3D printer
21.09.2016 | Fraunhofer-Institut für Keramische Technologien und Systeme IKTS

All articles from Trade Fair News >>>

The most recent press releases about innovation >>>

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

Im Focus: First-Ever 3D Printed Excavator Project Advances Large-Scale Additive Manufacturing R&D

Heavy construction machinery is the focus of Oak Ridge National Laboratory’s latest advance in additive manufacturing research. With industry partners and university students, ORNL researchers are designing and producing the world’s first 3D printed excavator, a prototype that will leverage large-scale AM technologies and explore the feasibility of printing with metal alloys.

Increasing the size and speed of metal-based 3D printing techniques, using low-cost alloys like steel and aluminum, could create new industrial applications...

Im Focus: New welding process joins dissimilar sheets better

Friction stir welding is a still-young and thus often unfamiliar pressure welding process for joining flat components and semi-finished components made of light metals.
Scientists at the University of Stuttgart have now developed two new process variants that will considerably expand the areas of application for friction stir welding.
Technologie-Lizenz-Büro (TLB) GmbH supports the University of Stuttgart in patenting and marketing its innovations.

Friction stir welding is a still-young and thus often unfamiliar pressure welding process for joining flat components and semi-finished components made of...

Im Focus: First quantum photonic circuit with electrically driven light source

Optical quantum computers can revolutionize computer technology. A team of researchers led by scientists from Münster University and KIT now succeeded in putting a quantum optical experimental set-up onto a chip. In doing so, they have met one of the requirements for making it possible to use photonic circuits for optical quantum computers.

Optical quantum computers are what people are pinning their hopes on for tomorrow’s computer technology – whether for tap-proof data encryption, ultrafast...

Im Focus: OLED microdisplays in data glasses for improved human-machine interaction

The Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP has been developing various applications for OLED microdisplays based on organic semiconductors. By integrating the capabilities of an image sensor directly into the microdisplay, eye movements can be recorded by the smart glasses and utilized for guidance and control functions, as one example. The new design will be debuted at Augmented World Expo Europe (AWE) in Berlin at Booth B25, October 18th – 19th.

“Augmented-reality” and “wearables” have become terms we encounter almost daily. Both can make daily life a little simpler and provide valuable assistance for...

Im Focus: Artificial Intelligence Helps in the Discovery of New Materials

With the help of artificial intelligence, chemists from the University of Basel in Switzerland have computed the characteristics of about two million crystals made up of four chemical elements. The researchers were able to identify 90 previously unknown thermodynamically stable crystals that can be regarded as new materials. They report on their findings in the scientific journal Physical Review Letters.

Elpasolite is a glassy, transparent, shiny and soft mineral with a cubic crystal structure. First discovered in El Paso County (Colorado, USA), it can also be...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Call for Paper – Panacea Green Infrastructure?

30.09.2016 | Event News

HLF: From an experiment to an establishment

29.09.2016 | Event News

European Health Forum Gastein 2016 kicks off today

28.09.2016 | Event News

 
Latest News

First-Ever 3D Printed Excavator Project Advances Large-Scale Additive Manufacturing R&D

30.09.2016 | Materials Sciences

New Technique for Finding Weakness in Earth’s Crust

30.09.2016 | Earth Sciences

Cells migrate collectively by intermittent bursts of activity

30.09.2016 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>