Measuring and testing – Hardness – By penetrator or indentor
Patent
1994-11-01
1996-07-23
Chilcot, Richard
Measuring and testing
Hardness
By penetrator or indentor
73 78, G01N 342, G01N 300
Patent
active
055378625
ABSTRACT:
A method for measuring dynamic hardness of elastic materials is applied particularly to determining the state of tonal quality for a piano hammer. The method includes selecting a piano hammer of predetermined type from a set of piano hammers, causing the selected piano hammer to strike against an impact surface having the form of a piano string or string grouping appropriate to a piano hammer of the predetermined type, measuring one or more elements of force and motion of the piano hammer striking the impact surface, e.g. force, determining, e.g., the cut-off frequency of the power spectrum for the selected piano hammer striking upon the impact surface, and comparing the determined cut-off frequency of the power spectrum for the selected piano hammer against a predetermined range of cut-off frequencies of power spectrum acceptable for piano hammer of the predetermined type. An apparatus for testing is also described.
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Kennedy Warren C.
Liang Paul N-J.
Scarton Henry A.
Yungman John F.
Chilcot Richard
Noori Max
Rensselaer Polytechnic Institute
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