Abstract
Laser vibrometry measurements on a bowed violin are performed. A rotating disc apparatus, acting as a violin bow, is developed. It produces a continuous, long, repeatable, multi-frequency sound from the instrument that imitates the real bow–string interaction for a 'very long bow'. What mainly differs is that the back and forward motion of the real bow is replaced by the rotating motion with constant velocity of the disc and constant bowing force (bowing pressure). This procedure is repeatable. It is long lasting and allows laser vibrometry techniques to be used, which measure forced vibrations by bowing at all excited frequencies simultaneously. A chain of interacting parts of the played violin is studied: the string, the bridge and the plates as well as the emitted sound field. A description of the mechanics and the sound production of the bowed violin is given, i.e. the production chain from the bowed string to the produced tone.
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Figure 9. (first harmonic, 285 Hz) Animated version of figure 9(a) (450 kB, MPG file).
Animated version of figure 9(b) (450 kB, MPG file).
Animated version of figure 9(c) (450 kB, MPG file).
Figure 10. (fourth harmonic, 1130 Hz) Animated version of figure 10(a) (450 kB, MPG file).
Animated version of figure 10(b) (450 kB, MPG file).
Animated version of figure 10(c) (390 kB, MPG file).
Figure 11. (fifth harmonic, 1415 Hz) Animated version of figure 11(a) (450 kB, MPG file).
Animated version of figure 11(b) (450 kB, MPG file).
Animated version of figure 11(c) (390 kB, MPG file).
Figure 12. (eighth harmonic, 2265 Hz) Animated version of figure 12(a) (450 kB, MPG file).