Experimental Study of a Low-Specific Speed Francis Model Runner during Resonance

Table 2

Uncertainty budget for the fundamental RSI amplitudes, BEP5.

Location	Amplitude RMS of fundamental frequency RSI	Calibration repeatability,	Vibration sensitivity,	Repeatability of the measurements,	Total relative uncertainty, (%)
R1	0.94 kPa	0.01 kPa	0.003 kPa	0.015 kPa	1.9
R2	0.70 kPa	0.01 kPa	0.003 kPa	0.011 kPa	2.2
R3	0.53 kPa	0.006 kPa	0.003 kPa	0.010 kPa	2.3
R4	0.30 kPa	0.006 kPa	0.003 kPa	0.012 kPa	4.6
A	0.028 ms^−2	1%	—	0.002 m/s^−2	7.1

The vibration sensitivity was calculated as 0.13 times the acceleration amplitude.