Affordable Access

Publisher Website

Tonal properties of the pianoforte in relation to bass bridge mechanical impedance

Authors
Journal
Journal of Sound and Vibration
0022-460X
Publisher
Elsevier
Publication Date
Volume
9
Issue
3
Identifiers
DOI: 10.1016/0022-460x(69)90181-3

Abstract

Abstract Rayleigh's theory for the effects of end-support motion on the modal frequencies of a vibrating string has been elaborated so as to incorporate some of the complex mechanical impedance conditions likely to operate at the pianoforte bass bridge. The notion has been put forward that the bass bridge, and the main vibrating portion of the soundboard, may be treated as independent mass systems mutually coupled and restrained by local compliances. Theoretical analysis of such dual mass combinations reveals double-peaked susceptance characteristics which may be predicted to impose progressive flattening in frequency of successive string modal vibrations within a specified range. The phenomenon may usefully serve to oppose a portion of the undesirable inharmonicity arising from finite string stiffness, thereby improving tonal performance, and it offers some rational justification for the adoption of “extended” bass bridges. The hypothesis has been tested on a short-stringed grand piano. Attachment of two suitable masses, one rigidly to the bass bridge and the other flexibly coupled to the soundboard, encourages a substantial subjective tonal improvement in the bass registers. The optimal size of these masses proved unexpectedly large; reasonable agreement can be reported between theoretically predicted and experimentally determined mass values. By taking account of the interaction of masses and compliances operating in association with the bass bridge, the hypothesis could partly explain the wide differences in tonal quality which may be encountered between various well-constructed pianos of comparable size.

There are no comments yet on this publication. Be the first to share your thoughts.

Statistics

Seen <100 times
0 Comments

More articles like this

A new biomedical mechanical impedance bridge.

on Medical research engineering 1976

Properties of the flow-impedance bridge detector

on Journal of Chromatography A Jan 01, 1977

[On the relation between mechanical properties and...

on Shika zairyō, kikai = Journal... July 1984

Mechanical properties of hard resins for crowns an...

on Nihon Hotetsu Shika Gakkai zas... October 2008
More articles like this..