Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Who can find the fish that makes the best sound?

28.02.2017

Using new computer algorithms, it is possible to adjust specific properties of three-dimensional objects, such as the sounds they produce or how stable they are.

Which sound will you hear if you strike a little metal fish with a drum stick? The answer to this question is fairly easy to work out using a computer these days. It is much more difficult to determine the shape of a metal object in order to generate a specific sound.


An object made of plastic is optimized to withstand a certain kind of stress particularly well.

TU Wien

The team led by Przemyslaw Musialski at TU Wien joined forces with Leif Kobbelt from RWTH Aachen to find a way to make this possible. Thanks to their work, specific complex requirements can now be defined for objects – including the sound they make or how resistant they are to certain mechanical stresses – and a computer algorithm is used to adapt the object such that it meets these particular specifications.

Changes to wall thickness

“We produce hollow objects or open shells with walls which are not uniform in their thickness,” explains Przemyslaw Musialski, Head of the Computational Fabrication Group at the Center for Geometry and Computational Design at TU Wien. “This variation in thickness allows us to adjust a whole range of properties in a targeted manner.” For example, an object made of plastic can be optimized such that it can withstand a certain kind of stress particularly well. The computer calculates how forces are distributed and what inner stresses are at play. The distribution of forces can be improved significantly by making changes to the wall thickness at the right points.

A similar process is used to change the sound made by metal objects. In order to demonstrate this principle, the team at TU Wien chose a number of different animal shapes, including a giraffe and a fish, and used the computer algorithm to adjust the thickness of the metal in such a way that a specific sound spectrum is exhibited when the objects are struck. They ended up with what is effectively a zoo glockenspiel!

New method to speed up calculations

“We are talking about some quite complex calculations here,” explains Musialski. “When you can change the thickness at any point, the number of different possibilities is huge. It is just not possible to simulate every single one of them on a computer. Instead, what you need is a carefully designed method that allows you to find a solution within a reasonable time frame.”

The important thing to remember is that in these cases there is normally not just one single solution. There is usually a range of shapes that will achieve the outcome one is looking for. Rather than finding the ideal shape, one just needs to ensure that the computer outputs a result that is sufficient.

“On this basis, we have managed to devise a new optimization method that reduces the design space drastically,” explains Przemyslaw Musialski. “It is then possible to find a good solution in the remaining subspace with great efficiency.” The results of the research were presented at the ACM SIGGRAPH 2016 conference and published in the journal ACM Transactions on Graphics (TOG) recently.

Video:
Several results achieved using the new method are presented in this video, including the zoo glockenspiel, a rabbit-shaped bell and a plastic cat that can withstand high mechanical stresses:
https://youtu.be/AScDKsL5H7g

Original publication: http://dl.acm.org/author_page.cfm?id=99658729263
Musialski P, Hafner C, Rist F, Birsak M, Wimmer M, Kobbelt L
Non-linear shape optimization using local subspace projections. ACM Trans Graph.
2016; 35(4):1-13. DOI: 10.1145/2897824.2925886.

Picture download: https://www.tuwien.ac.at/dle/pr/aktuelles/downloads/2017/fisch

Further information:
Dr. Przemyslaw Musialski
TU Wien
Institute of Discrete Mathematics and Geometry
Wiedner Hauptstr. 8, 1040 Vienna
T: +43-1-58801-10442
przemyslaw.musialski@tuwien.ac.at

Weitere Informationen:

https://youtu.be/AScDKsL5H7g Several results achieved using the new method are presented in this video, including the zoo glockenspiel, a rabbit-shaped bell and a plastic cat that can withstand high mechanical stresses

Dr. Florian Aigner | Technische Universität Wien

More articles from Information Technology:

nachricht Next stop Morocco: EU partners test innovative space robotics technologies in the Sahara desert
09.11.2018 | Deutsches Forschungszentrum für Künstliche Intelligenz GmbH, DFKI

nachricht A burst of ”synchronous” light
08.11.2018 | Empa - Eidgenössische Materialprüfungs- und Forschungsanstalt

All articles from Information Technology >>>

The most recent press releases about innovation >>>

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

Im Focus: A Chip with Blood Vessels

Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.

Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...

Im Focus: A Leap Into Quantum Technology

Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.

In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...

Im Focus: Research icebreaker Polarstern begins the Antarctic season

What does it look like below the ice shelf of the calved massive iceberg A68?

On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.

Im Focus: Penn engineers develop ultrathin, ultralight 'nanocardboard'

When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure

Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...

Im Focus: Coping with errors in the quantum age

Physicists at ETH Zurich demonstrate how errors that occur during the manipulation of quantum system can be monitored and corrected on the fly

The field of quantum computation has seen tremendous progress in recent years. Bit by bit, quantum devices start to challenge conventional computers, at least...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

“3rd Conference on Laser Polishing – LaP 2018” Attracts International Experts and Users

09.11.2018 | Event News

On the brain’s ability to find the right direction

06.11.2018 | Event News

European Space Talks: Weltraumschrott – eine Gefahr für die Gesellschaft?

23.10.2018 | Event News

 
Latest News

Epoxy compound gets a graphene bump

14.11.2018 | Materials Sciences

Microgel powder fights infection and helps wounds heal

14.11.2018 | Health and Medicine

How algae and carbon fibers could sustainably reduce the athmospheric carbon dioxide concentration

14.11.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>