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Analysis of handling noises on wound strings.
J Pakarinen1, H Penttinen, B Bank
1Laboratory of Acoustics and Audio Signal Processing, Helsinki University of Technology, PO Box 3000, FI-02015 TKK, Finland. jyri.pakarinen@tkk.fi
The Journal of the Acoustical Society of America
|February 6, 2008
Summary
Sliding a finger along a wound string creates handling noise with harmonic structures. Noise frequency and amplitude increase linearly with sliding speed, exciting string vibrations.
Area of Science:
- Acoustics
- Vibrational Mechanics
- Tribology
Background:
- Handling noises from stringed instruments are common.
- The acoustic properties of wound strings are complex.
- Understanding friction-induced vibrations is crucial for instrument design.
Purpose of the Study:
- To analyze the acoustic characteristics of handling noise on wound strings.
- To investigate the relationship between sliding speed and noise properties.
- To identify the vibrational modes excited by finger sliding.
Main Methods:
- Experimental analysis of sound produced by sliding a finger on a wound string.
- Frequency spectrum analysis of the generated noise.
- Measurement of root-mean-square amplitude in relation to sliding velocity.
Main Results:
- Handling noise exhibits a harmonic structure due to the string's periodic texture.
- Noise frequency and root-mean-square amplitude show a linear correlation with sliding speed.
- Finger sliding excites longitudinal modes, creating static harmonics in the noise spectrum.
- Different sliding locations excite distinct longitudinal modes.
Conclusions:
- The study quantifies the relationship between sliding dynamics and acoustic output for wound strings.
- Findings contribute to understanding friction-induced noise in musical instruments and mechanical systems.
- The excitation of specific vibrational modes offers insights into string-object interactions.
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