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 The Micro Nanotech area at MD&M West has been successfully established
22.02.2017 | IVAM Fachverband für Mikrotechnik

nachricht Use your Voice – and Smart Homes will “LISTEN”
21.02.2017 | EML European Media Laboratory GmbH

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: Breakthrough with a chain of gold atoms

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

Im Focus: DNA repair: a new letter in the cell alphabet

Results reveal how discoveries may be hidden in scientific “blind spots”

Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...

Im Focus: Dresdner scientists print tomorrow’s world

The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.

The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...

Im Focus: Mimicking nature's cellular architectures via 3-D printing

Research offers new level of control over the structure of 3-D printed materials

Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...

Im Focus: Three Magnetic States for Each Hole

Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".

Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Booth and panel discussion – The Lindau Nobel Laureate Meetings at the AAAS 2017 Annual Meeting

13.02.2017 | Event News

Complex Loading versus Hidden Reserves

10.02.2017 | Event News

International Conference on Crystal Growth in Freiburg

09.02.2017 | Event News

 
Latest News

Microhotplates for a smart gas sensor

22.02.2017 | Power and Electrical Engineering

Scientists unlock ability to generate new sensory hair cells

22.02.2017 | Life Sciences

Prediction: More gas-giants will be found orbiting Sun-like stars

22.02.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>