Test 4 – Duration between start of vertical and horizontal vibrations at various MIDI velocities and various H sensor positions, with fixed V sensor positions.

Analysis

• Two tests made at different times have shown similar results in which the Stuart string commences horizontal oscillations later in the cycle compared to the Steinway string
• Photo 2 (b) shows that the strike frequency is consistently equal to f towards the end of the cycle

Conclusion

• Compared to the Steinway string, the Stuart commences oscillating by ±0.2mm by up to four times later in the cycle
• The Steinway string has a greater tendency to stabilise its oscillating frequency in the
horizontal direction
• Both strings exhibit a sub-harmonic

Initial data and photos

Table 1 and the photos on the following pages are from initial tests carried out on the Steinway string. An explanation of each photo is in Table 1. Photos were taken after each test. The results obtained from the initial tests showed that the Steinway string appears to adopt a more rotational vibration compared to the Stuart. This is shown by the results of tests 1 and 3. Tests 13 and 14 demonstrated the effect of a