(Color online) Couchet harpsichord acquired in 2003 by the Musée de la musique in Paris (inventory number E. 2003.6.1).
(Color online) Couchet harpsichord in plan view. (Left) Internal structure, radiography before restoration; (right) visible structure.
(Color online) Brass gap spacers added during restoration. (Left) Before addition; (right) after addition. Three identical spacers were added.
(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.
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).
(Color online) Example of six representative modal shapes and frequencies calculated.
(Color online) Experimental setup. Harpsichord in the anechoic room with holographic microphone array.
(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.
(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.
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.
(Color online) Mode shapes. Numerical/experimental comparison.
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.
Mechanical properties of the harpsichord components.
Effect of restoration on dynamic behavior.
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