Publication Date

1991

Document Type

Dissertation/Thesis

First Advisor

Rossing, Thomas D., 1929-

Degree Name

M.S. (Master of Science)

Department

Department of Physics

LCSH

Shock (Mechanics)--Measurement||Piano

Abstract

A pendulum was dropped on a piano key, throwing the piano hammer upwards to strike a stationary force transducer. Measurements of the hammer force pulse for different velocities show that the hammer behaves like a hardening spring, becoming stiffer as the impact velocity increases. The residual shock spectrum was obtained with an FFT analyzer. The maximum value of the shock spectrum, fmax, indicates the frequency at which the hammer is most effective at transferring its energy. As the hammer velocity increases, the shock spectrum broadens and fmax increases. Values of fmax, corresponding to velocities observed in a real piano, were obtained for three sets of hammers: properly voiced, hard, and soft, each set covering the range of the piano keyboard. The dependence of fmax on hammer velocity, stiffness, and position along the piano keyboard is shown to agree very well with the observed timbre of piano sounds for different dynamic levels, hammer stiffnesses, and keyboard position.

Comments

Includes bibliographical references (pages [78]-80)

Extent

ix, 80 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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