Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Less Vibration of Cranes: Faster Loading of Ships

14.02.2011
An active vibration damper system from Siemens is helping to cut the time required to load and unload container vessels. In the case of conventional container cranes, the container bridge vibrates whenever loads are lifted and moved.

To restrict such motion, so that containers can be set down with an accuracy of a few centimeters, crane drivers have to reduce operating speed, which extends loading and unloading times. The active damper system from Siemens counteracts vibrations by moving a weight along the container bridge. This keeps the crane steady at faster operating speeds. Siemens plans to introduce the system on the market by mid-2011, together with a crane builder.


Today’s container cranes have to be over 30 meters high in order to accommodate large container ships. At the same time, however, they must take up as little dockside space as possible, so that port vehicles have enough room. Such a delicate construction is not sufficiently rigid to withstand the forces generated by a swinging container. This results in vibrations: The greater the speed at which the crane trolley transports the load along the container bridge, the more the structure vibrates. So-called “passive mass dampers,” which weigh as much as 60 tons, are usually used to quell the vibrations. Suspended like a pendulum, they absorb them with a damper system, such as a hydraulic cylinder.

By comparison, the active damping system from Siemens Drive Technologies functions in a much more precise way and is able to make do with one tenth of the weight. Sensors on the container bridge measure the crane’s vibrations and transmit this data to a linear motor’s control system. On the basis of this information, the linear motor moves a weight of only a few metric tons along the container bridge. By means of precise acceleration and braking of this motor, forces are applied to the crane. Special algorithms are used to control the movement of the linear motor in such a way that vibrations are rapidly and effectively neutralized.

The active damping system was originally developed for mechanical engineering applications, especially for machinery used to produce parts with very precise surface characteristics. The work must be performed at low speeds, however, due to machine vibrations, resulting in high costs. Analysis of the precise characteristics of these vibrations made it possible to devise algorithms for a machine control system that suppresses such shaking. This procedure is currently undergoing testing with pilot customers.

Dr. Norbert Aschenbrenner | Siemens InnovationNews
Further information:
http://www.siemens.com/innovationnews

Further reports about: Cranes Ships Vibration active damper system container bridge damping system

More articles from Transportation and Logistics:

nachricht Study sets new distance record for medical drone transport
13.09.2017 | Johns Hopkins Medicine

nachricht Researchers 'count cars' -- literally -- to find a better way to control heavy traffic
10.08.2017 | Florida Atlantic University

All articles from Transportation and Logistics >>>

The most recent press releases about innovation >>>

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

Im Focus: Optical Nanoscope Allows Imaging of Quantum Dots

Physicists have developed a technique based on optical microscopy that can be used to create images of atoms on the nanoscale. In particular, the new method allows the imaging of quantum dots in a semiconductor chip. Together with colleagues from the University of Bochum, scientists from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute reported the findings in the journal Nature Photonics.

Microscopes allow us to see structures that are otherwise invisible to the human eye. However, conventional optical microscopes cannot be used to image...

Im Focus: Artificial agent designs quantum experiments

On the way to an intelligent laboratory, physicists from Innsbruck and Vienna present an artificial agent that autonomously designs quantum experiments. In initial experiments, the system has independently (re)discovered experimental techniques that are nowadays standard in modern quantum optical laboratories. This shows how machines could play a more creative role in research in the future.

We carry smartphones in our pockets, the streets are dotted with semi-autonomous cars, but in the research laboratory experiments are still being designed by...

Im Focus: Scientists decipher key principle behind reaction of metalloenzymes

So-called pre-distorted states accelerate photochemical reactions too

What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...

Im Focus: The first precise measurement of a single molecule's effective charge

For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.

Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...

Im Focus: Paradigm shift in Paris: Encouraging an holistic view of laser machining

At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.

No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks Industry & Economy
Event News

10th International Symposium: “Advanced Battery Power – Kraftwerk Batterie” Münster, 10-11 April 2018

08.01.2018 | Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

 
Latest News

Researchers reveal how microbes cope in phosphorus-deficient tropical soil

23.01.2018 | Earth Sciences

Opening the cavity floodgates

23.01.2018 | Life Sciences

Siberian scientists suggested a new method for synthesizing a promising magnetic material

23.01.2018 | Materials Sciences

VideoLinks Science & Research
Overview of more VideoLinks >>>