Test 3 – Maximum horizontal vibration distance of both strings at various MIDI velocities (Vertical sensor moved to not contact string)

Analysis
• In the horizontal direction, the Steinway string registers strikes at a sensor distance slightly greater than 0.4mm.
• A similar strike rate occurs with the Stuart string when the sensor contact is 0.25mm from the string.
• The Steinway string horizontal vibrations are 37.5% greater than for the Stuart string.
• At MIDI 72, the Steinway string vibrates horizontally by 0.2mm with increasing strength (shown by the f component over a total period of 2.25s).
• At MIDI 72, the Stuart string vibrates by 0.1mm for 1.7s.
• Both strings start with a horizontal vibration rate of half the fundamental (f/2),which resolves into the fundamental (f), then back to half the fundamental (f/2).

Conclusion

• Compared to the Steinway string, the horizontal excursion distance of the Stuart string is significantly less.
• The Steinway string has a greater tendency to maintain horizontal oscillations
• Both strings exhibit a sub-harmonic.