Debris Fence

sonar-3D simulation of a debris fence as used along borders of racing circuits to protect spectators. The impact was numerically simulated with sonar software in a very high level of detail. The element resolution of the wire-material was in order of magnitude of 100’000 objects.


The sonar chain module realistically simulates every type and geometry of a chain drive. The movie shows a toothed chain together with a simple, deliberately soft damper. The figure below shows a classic roller chain. The chain module provides special functions for the chain design. Simple chain applications can also be created by the user using sonar script macro language implemented in sonar-LAB.

Rockfall Barrier

Rockfall Barrier

This page reports about the Rockfall Barrier Project presented at the 50th US Rock Mechanics/Geomechanics Symposium held in Houston, Texas, 26-29 June 2016.

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Abstract for the 50th US Rock Mechanics/Geomechanics Symposium held in Houston, Texas, 26-29 June 2016.

High-resolution numeric simulation of a standard rockfall test setup.

In cooperation with the company Geobrugg AG Switzerland, which specializes in security systems in the area of rockfall, we numerically simulated a standard test setup in high resolution in terms of the detailing with the “sonar” simulation software. The certified “Falling Rock Protection Barrier RXE-1000,” which has been intensively tested, experimentally measured and analyzed, formed the basis. The equipment consists in its core of several elastic ring-grid fields which, together with the suspension, can absorb energy of up to 1000 kJ. For the corresponding practical tests, we have detailed results for the movement behavior of the overall system and of various specific parts. Further, comprehensive measurements at various key positions were also taken during the practical trials. Slow motion recordings of the impact from various perspectives complete the base material.
This entire rockfall test setup was then modelled three-dimensionally at very high level of detail (down to the bolts, cables and wires) and simulated dynamically. A comparison of the results shows that in the future, we will be able to make very precise predictions about the dynamic movement behavior of complex systems in full detail as well as associated exact predictions of the physical loads. The match between experiment and theory will be documented in the next steps in a series of video clips that show comparative movement behavior as a function of time of various parts of the system.
The success of this dynamic analysis prompted us to develop a modular system that’s industry-specific in terms of simulation for the rockfall and security-system fields: in the future, this will allow for the creation and simulation of a model of a complete system within a reasonably short time.