Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Cebit 2012: The wireless bicycle brake, a prototype on an exciting mission

24.02.2012
At this time, wireless networks are able to brake just one bike, but in the future, the technical elements will be further developed to regulate entire trains as they travel over the lines.

In view of that fact, computer scientists at Saarland University are designing mathematical calculations to check such systems automatically. The scientists will present their results at stand F34 in hall 26 at the computer fair Cebit. The trade show takes place in Hanover, Germany from March 6 to 10.


Holger Hermanns, computer science professor at Saarland University, confirmed the reliability of his wireless bicycle brake through mathematical calculations. Foto: Angelika Klein

Professor Holger Hermanns, who holds the chair of Dependable Systems and Software, and who developed the wireless bicycle brake together with his group, explains: “Wireless networks are never a fail-safe method. That’s a fact that’s based on a technological background.” Nonetheless, the trend is to set up wireless systems that, like a simple bicycle brake, have to function all the time. “In the field of the future European Train Service, for example, concrete plans already exist,” Hermanns reports. Furthermore, he says that train and airplane experiments are far too sophisticated, and could even endanger the life of human beings in case of malfunction.

Therefore, the Saarland computer scientist’s mathematical methods should now verify the correct function and interaction of the components automatically. “The wireless bicycle brake gives us the necessary playground to optimize these methods for operation in much more complex systems,” Hermanns adds.

Therefore, his research group examines the brake prototype with algorithms that normally are used in control systems for aircraft or chemical factories. As a result, they found out that the brake works with 99.9999999999997 percent reliability. “This implies that out of a trillion braking attempts, we have three failures,” Hermanns explains and concludes: “That is not perfect, but acceptable.”

To brake with the wireless brake, a cyclist needs only clench the rubber grip on the right handle. The more tightly the grip is clenched, the harder the disk brake on the front wheel works. It seems as if a ghost hand is in play, but a combination of several electronic components enables the braking. Integrated in the rubber grip is a pressure sensor, which activates a sender if a specified pressure threshold is crossed. The sender is integrated in a blue plastic box which is the size of a cigarette packet and is attached to the handlebar.

Its radio signals are sent to a receiver attached at the end of the bicycle’s fork. The receiver forwards the signal to an actuator, transforming the radio signal into the mechanical power by which the disk brake is activated. The electrical energy is supplied by a battery, which is also attached to the bicycle’s fork.

To enhance reliability, there are additional senders attached to the bicycle. These repeatedly send the same signal.

Its current configuration enables the cruiser bike to brake within 250 milliseconds. This means that at a speed of 30 kilometers per hour, the cyclist has to react two meters before reaching the dangerous situation. But the Saarland University computer scientists are not satisfied with just this functionality. “It is not difficult to integrate an anti-lock braking system and traction control. That takes only a few adjustments,” Hermanns explains.

Researching the wireless bicycle brake was funded within the special research field “Automatic Verification and Analysis of Complex Systems (AVACS)” by the German Research Foundation. Besides Holger Hermanns, several researchers from Saarland University are involved. These are Professors Sebastian Hack, Markus Bläser, Reinhard Wilhelm, Jan Reineke, Bernd Finkbeiner and Verena Wolf.

Professor Kurt Mehlhorn and Christoph Weidenbach of the Max-Planck-Institute for Informatics in Saarbrücken are involved in the project, too. In 2011, the Research Foundation Group approved about 8.7 million euro, and about 3.5 million inure to the benefit of the Saarland research work. Since 2004, the special research group has been sponsored with approximately 26 million euros, and 9.5 million went to the computer scientists at Saarland University.

Thorsten Mohr | Universität des Saarlandes
Further information:
http://www.avacs.org/
http://www.mpi-sws.org/~vahldiek/papers/wowmom.pdf
http://depend.cs.uni-saarland.de/

More articles from CeBIT 2012:

nachricht UDE at the CeBIT fair: Protecting huge National Parks
07.03.2012 | Universität Duisburg-Essen

nachricht Cebit: Automated stress testing for Web 2.0 applications helps developers find programming errors
27.02.2012 | Universität des Saarlandes

All articles from CeBIT 2012 >>>

The most recent press releases about innovation >>>

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

Im Focus: Full speed ahead for SmartEEs at Automotive Interiors Expo 2019

Flexible, organic and printed electronics conquer everyday life. The forecasts for growth promise increasing markets and opportunities for the industry. In Europe, top institutions and companies are engaged in research and further development of these technologies for tomorrow's markets and applications. However, access by SMEs is difficult. The European project SmartEEs - Smart Emerging Electronics Servicing works on the establishment of a European innovation network, which supports both the access to competences as well as the support of the enterprises with the assumption of innovations and the progress up to the commercialization.

It surrounds us and almost unconsciously accompanies us through everyday life - printed electronics. It starts with smart labels or RFID tags in clothing, we...

Im Focus: Energy-saving new LED phosphor

The human eye is particularly sensitive to green, but less sensitive to blue and red. Chemists led by Hubert Huppertz at the University of Innsbruck have now developed a new red phosphor whose light is well perceived by the eye. This increases the light yield of white LEDs by around one sixth, which can significantly improve the energy efficiency of lighting systems.

Light emitting diodes or LEDs are only able to produce light of a certain colour. However, white light can be created using different colour mixing processes.

Im Focus: Quantum gas turns supersolid

Researchers led by Francesca Ferlaino from the University of Innsbruck and the Austrian Academy of Sciences report in Physical Review X on the observation of supersolid behavior in dipolar quantum gases of erbium and dysprosium. In the dysprosium gas these properties are unprecedentedly long-lived. This sets the stage for future investigations into the nature of this exotic phase of matter.

Supersolidity is a paradoxical state where the matter is both crystallized and superfluid. Predicted 50 years ago, such a counter-intuitive phase, featuring...

Im Focus: Explosion on Jupiter-sized star 10 times more powerful than ever seen on our sun

A stellar flare 10 times more powerful than anything seen on our sun has burst from an ultracool star almost the same size as Jupiter

  • Coolest and smallest star to produce a superflare found
  • Star is a tenth of the radius of our Sun
  • Researchers led by University of Warwick could only see...

Im Focus: Quantum simulation more stable than expected

A localization phenomenon boosts the accuracy of solving quantum many-body problems with quantum computers which are otherwise challenging for conventional computers. This brings such digital quantum simulation within reach on quantum devices available today.

Quantum computers promise to solve certain computational problems exponentially faster than any classical machine. “A particularly promising application is the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Veranstaltungen

Wie sieht das Essen der Zukunft aus?

25.04.2019 | Veranstaltungen

Künstliche Intelligenz: Lernen von der Natur

17.04.2019 | Veranstaltungen

Mobilität im Umbruch – Conference on Future Automotive Technology, 7.-8. Mai 2019, Fürstenfeldbruck

17.04.2019 | Veranstaltungen

VideoLinks
Science & Research
Overview of more VideoLinks >>>
 
Aktuelle Beiträge

UKP-Laser erobern Makrobearbeitung

25.04.2019 | Verfahrenstechnologie

Kraftwerk ohne DNA

25.04.2019 | Biowissenschaften Chemie

Chemische Reaktionen per Licht antreiben

25.04.2019 | Biowissenschaften Chemie

Weitere B2B-VideoLinks
IHR
JOB & KARRIERE
SERVICE
im innovations-report
in Kooperation mit academics