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Restoration of a 17th-century harpsichord to playable condition: A numerical and experimental study
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10.1121/1.3651092
/content/asa/journal/jasa/131/1/10.1121/1.3651092
http://aip.metastore.ingenta.com/content/asa/journal/jasa/131/1/10.1121/1.3651092

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Couchet harpsichord acquired in 2003 by the Musée de la musique in Paris (inventory number E. 2003.6.1).

Image of FIG. 2.
FIG. 2.

(Color online) Couchet harpsichord in plan view. (Left) Internal structure, radiography before restoration; (right) visible structure.

Image of FIG. 3.
FIG. 3.

(Color online) Brass gap spacers added during restoration. (Left) Before addition; (right) after addition. Three identical spacers were added.

Image of FIG. 4.
FIG. 4.

(Color online) Finite element model. The model is composed of 40 460 orthotropic shell elements and 657 beam elements. Static forces due to string tension are included in the model.

Image of FIG. 5.
FIG. 5.

Shear stress distribution on the soundboard. Calculated with the complete model, with downbearing and restoration added elements. Shear stress range is (−3.41 × 106 Pa; 3.53 × 105 Pa).

Image of FIG. 6.
FIG. 6.

(Color online) Example of six representative modal shapes and frequencies calculated.

Image of FIG. 7.
FIG. 7.

(Color online) Experimental setup. Harpsichord in the anechoic room with holographic microphone array.

Image of FIG. 8.
FIG. 8.

(Color online) Experimental setup. (Left) String muting system. The soundboard is maintained in its actual stress state. (Right) Point impulse excitation. The impact automated hammer was placed on the underside of the soundboard.

Image of FIG. 9.
FIG. 9.

(Color online) Measurement grid. The field was sampled according to a 12.5 mm step and 1162.5 × 1762.5 mm2, which count 13 348 point acoustic impulse responses.

Image of FIG. 10.
FIG. 10.

Radiated pressure spectra and string frequencies. The sound pressure level is averaged on the whole measurement plane, positioned at 72 mm from the soundboard plane.

Image of FIG. 11.
FIG. 11.

(Color online) Mode shapes. Numerical/experimental comparison.

Image of FIG. 12.
FIG. 12.

Shear stress distribution on the soundboard. Effects of restoration (addition of three brass gap spacers and two wooden blocks). Shear stress range is (−4.18 × 106 Pa; 3.81 × 105 Pa) before restoration.

Tables

Generic image for table
TABLE I.

Mechanical properties of the harpsichord components.

Generic image for table
TABLE II.

Effect of restoration on dynamic behavior.

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/content/asa/journal/jasa/131/1/10.1121/1.3651092
2012-01-13
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Restoration of a 17th-century harpsichord to playable condition: A numerical and experimental study
http://aip.metastore.ingenta.com/content/asa/journal/jasa/131/1/10.1121/1.3651092
10.1121/1.3651092
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