culturalheritage.digital · 3D Imaging of Sensitive Objects

culturalheritage.digital 3D Imaging of Sensitive Objects

Reproduction of a 15th century bone flute


flute
We produced a playable replica of a 15th century bone flute for the Musikinstrumentensammlung Willisau, Switzerland. The flute block is not preserved, therefore the original instrument does not produce sound. In the course of our work we performed a high resolution X-ray computed tomography, designed a variety of new blocks as CAD models, tested them with a fluid dynamic simulation, and printed a playable replication.

The slides for a lecture on the subject that we recently gave at the Cité de la musique in Paris can be found here.

X-Ray µCT Scan of a Guadagnini Viol

Guadagnini

Scans of instruments like violins and viols can be represented as high-quality images. A spatial resolution of 100 µm voxel size allows for the examination of all structural elements. Even minuscule details, like tool marks, vestiges of prior repairs, and micro cracks can be rendered visible. Thickness measurements can be performed with high precision. The cross sections of the soundboard can be used for dendrochronological dating. By extracting the surface, the data set can be used for the replication of all individual parts of the instrument using 3D-printing or CNC-milling with an accuracy of max. 0.1 mm deviation. Even wood density can be determined for all parts.

Guadagnini

In the volume rendering of the soundboard a horizontal reinforcement of the bass bar is clearly visible. The cross section at this position shows that it caused a flat deformation of the arching. It might be considered to remove this part in order to correct the arching. The other reinforcements and the soundpost patch in the back can be examined as well.

Guadagnini

FEM physical model of a Philippine gong


Drawing


One gong of a Philippine Kulintang gong chime. The geometric model based on a 3D surface scan is utilized for finite element method (FEM) physical modelling. Modal deflection shapes ([0,1], [1,1] and [2,1]) obtained from an eigenvalue analysis with free-free boundary conditions. The original instrument is situated at the University of Hamburg, Germany


Drawing Drawing Drawing
[0,1] 438 Hz [1,1] 752 Hz [2,1] 1557 Hz